Article
Astronomy & Astrophysics
Laura D. Baravalle, Maria Victoria Alonso, Dante Minniti, Jose Luis Nilo Castellon, Mario Soto, Carlos Valotto, Carolina Villalon, Dario Grana, Eduardo B. Amores, Fernanda Milla Castro
Summary: This study maps the distribution of galaxies across the Southern Galactic plane using the VISTA Variables in the Via Lactea Survey (VVV), resulting in a catalogue of 5563 visually confirmed galaxies, with 99% being new discoveries. The galaxy density distribution closely resembles the distribution of low interstellar extinction, and the main limitations for detecting background galaxies in the Zone of Avoidance are interstellar extinction and stellar density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Laura D. Baravalle, Eduardo O. Schmidt, M. Victoria Alonso, Ana Pichel, Dante Minniti, Adriana R. Rodriguez-Kamenetzky, Nicola Masetti, Carolina Villalon, Leigh C. Smith, Philip W. Lucas
Summary: The goal of this study is to search for AGNs in the Galactic disc at low latitudes. Through analyzing the near-IR and mid-IR properties and variability of five sources, we identified four AGN candidates and one YSO candidate. The results are consistent with previous findings on AGN and quasar variability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alice M. Eltvedt, T. Shanks, N. Metcalfe, B. Ansarinejad, L. F. Barrientos, R. Sharp, U. Malik, D. N. A. Murphy, M. Irwin, M. Wilson, D. M. Alexander, Andras Kovacs, Juan Garcia-Bellido, Steven Ahlen, David Brooks, Axel de la Macorra, Andreu Font-Ribera, Satya Gontcho a Gontcho, Klaus Honscheid, Aaron Meisner, Ramon Miquel, Jundan Nie, Gregory Tarle, Mariana Vargas-Magana, Zhimin Zhou
Summary: We present the VST ATLAS Quasar Survey, which includes over 1,229,000 quasar (QSO) candidates with 16 < g < 22.5 over an area of approximately 4,700 square degrees. The survey aims to reach a QSO sky density of 130 deg-2 for z < 2.2 and about 30 deg-2 for z > 2.2. The selection of candidates is guided by X-ray/UV/optical/MIR data in the William Herschel Deep Field (WHDF) and we find that about 25% of the QSOs are morphologically classified as optically extended. In terms of completeness and contamination, MIR, UV, and X-ray selections are 70-90% complete, with X-ray suffering less contamination than MIR and UV.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
David Stark, Karen L. Masters, Vladimir Avila-Reese, Rogemar Riffel, Rogerio Riffel, Nicholas Fraser Boardman, Zheng Zheng, Anne-Marie Weijmans, Sean Dillon, Catherine Fielder, Daniel Finnegan, Patricia Fofie, Julian Goddy, Emily Harrington, Zachary Pace, Wiphu Rujopakarn, Nattida Samanso, Shoaib Shamsi, Anubhav Sharma, Elizabeth Warrick, Catherine Witherspoon, Nathan Wolthuis
Summary: This study examines the relationship between HI-to-stellar mass ratio and star formation properties probed by optical emission lines, finding a weak correlation at short time scales but a stronger connection at longer time scales. The research also identifies a correlation between oxygen equivalent width and gas-phase metallicity, and suggests that gas-rich galaxies may have higher fractions of diffuse and/or shock-heated gas.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
I. H. Whittam, M. J. Jarvis, C. L. Hale, M. Prescott, L. K. Morabito, I Heywood, N. J. Adams, J. Afonso, Fangxia An, Y. Ao, R. A. A. Bowler, J. D. Collier, R. P. Deane, J. Delhaize, B. Frank, M. Glowacki, P. W. Hatfield, N. Maddox, L. Marchetti, A. M. Matthews, I Prandoni, S. Randriamampandry, Z. Randriamanakoto, D. J. B. Smith, A. R. Taylor, N. L. Thomas, M. Vaccari
Summary: In this study, we investigated the properties of the faint radio source population detected in the COSMOS field using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data, with a focus on the radio-loud active galactic nuclei (AGNs). Based on extensive multiwavelength data, we classified 88% of the 5223 radio sources in the field as AGNs or star-forming galaxies. We selected a sample of radio-loud AGNs with redshifts up to z~6 and studied their classification as high-excitation and low-excitation radio galaxies (HERGs and LERGs).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Benne W. Holwerda, Dominic Smith, Lori Porter, Chris Henry, Ren Porter-Temple, Kyle Cook, Kevin A. Pimbblet, Andrew M. Hopkins, Maciej Bilicki, Sebastian Turner, Viviana Acquaviva, Lingyu Wang, Angus H. Wright, Lee S. Kelvin, Meiert W. Grootes
Summary: This study reveals the bimodality in various properties of galaxy populations. Using the Self-Organizing Maps (SOM) technique, the clustering results in the feature space can be mapped onto a 2D representation. The analysis indicates the existence of three or five sub-populations. Moreover, multiple interstitial populations within the "green valley" galaxies are identified. The study also shows the capability of SOMs in separating certain morphological features.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
H. Dominguez Sanchez, B. Margalef, M. Bernardi, M. Huertas-Company
Summary: This paper presents the MaNGA PyMorph photometric Value Added Catalogue (MPP-VAC-DR17) and the MaNGA Deep Learning Morphological VAC (MDLM-VAC-DR17) for the final data release of the MaNGA survey. The MPP-VAC-DR17 provides photometric parameters from Sersic and Sersic+Exponential fits to the two-dimensional surface brightness profiles of the MaNGA DR17 galaxy sample, while the MDLM-VAC-DR17 provides deep-learning-based morphological classifications for the same galaxies, with improvements compared to previous releases.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V. A. Lepingwell, A. J. Bird, S. R. Gunn
Summary: This research presents two new approaches to aid in the production of future hard X-ray catalogues, reducing the reliance on human intervention during the detection of faint excesses in maps that contain systematic noise. A convolutional neural network has been trained to create a more sensitive source detection tool, while a method based on Bayesian reasoning is better able to combine detections from multiple observations. These improved techniques detect previously undetected sources in the data set used to derive the published catalogue.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
L. J. M. Davies, J. E. Thorne, A. S. G. Robotham, S. Bellstedt, S. P. Driver, N. J. Adams, M. Bilicki, R. A. A. Bowler, M. Bravo, L. Cortese, C. Foster, M. W. Grootes, B. Haussler, A. Hashemizadeh, B. W. Holwerda, P. Hurley, M. J. Jarvis, C. Lidman, N. Maddox, M. Meyer, M. Paolillo, S. Phillipps, M. Radovich, M. Siudek, M. Vaccari, R. A. Windhorst
Summary: The DEVILS project is a high-completeness, deep spectroscopic survey aiming to provide data for approximately 60,000 galaxies. They use the ProFound image analysis package and state-of-the-art imaging data sets for matched-source photometry derivation, which shows good consistency in color analysis and superior total source photometry.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Gulay Gurkan, I Prandoni, A. O'Brien, W. Raja, L. Marchetti, M. Vaccari, S. Driver, E. Taylor, T. Franzen, M. J. Brown, S. Shabala, H. Andernach, A. M. Hopkins, R. P. Norris, D. Leahy, M. Bilicki, H. Farajollahi, T. Galvin, G. Heald, B. S. Koribalski, T. An, K. Warhurst
Summary: This article presents the observations made by the Australian Square Kilometre Array Pathfinder (ASKAP) on the Galaxy and Mass Assembly (GAMA)-23h field. The survey covered an area of approximately 83 square degrees at 887.5 MHz, resulting in a radio source catalogue with 39,812 entries and the identification of host galaxies for 5934 of those sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. Shirley, K. Duncan, M. C. Campos Varillas, P. D. Hurley, Y. Roehlly, M. W. L. Smith, H. Aussel, T. Bakx, V Buat, D. Burgarella, N. Christopher, S. Duivenvoorden, S. Eales, A. Efstathiou, E. A. Gonzalez Solares, M. Griffin, M. Jarvis, B. Lo Faro, L. Marchetti, I McCheyne, A. Papadopoulos, K. Penner, E. Pons, M. Prescott, E. Rigby, H. Rottgering, A. Saxena, J. Scudder, M. Vaccari, L. Wang, S. J. Oliver, K. Malek
Summary: The Herschel Extragalactic Legacy Project (HELP) collates and creates data products for high-quality multiwavelength extragalactic datasets, with a focus on open methodologies, reproducibility, and provenance. Their first data release includes far-infrared photometry, photometric redshifts, and derived physical properties estimated from modelling the spectral energy distributions over the full sky.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
W. G. Hartley, A. Choi, A. Amon, R. A. Gruendl, E. Sheldon, I Harrison, G. M. Bernstein, I Sevilla-Noarbe, B. Yanny, K. Eckert, H. T. Diehl, A. Alarcon, M. Banerji, K. Bechtol, R. Buchs, S. Cantu, C. Conselice, J. Cordero, C. Davis, T. M. Davis, S. Dodelson, A. Drlica-Wagner, S. Everett, A. Ferte, D. Gruen, K. Honscheid, M. Jarvis, M. D. Johnson, N. Kokron, N. MacCrann, J. Myles, A. B. Pace, A. Palmese, F. Paz-Chinchon, M. E. S. Pereira, A. A. Plazas, J. Prat, M. Rodriguez-Monroy, E. S. Rykoff, S. Samuroff, C. Sanchez, L. F. Secco, F. Tarsitano, A. Tong, M. A. Troxel, Z. Vasquez, K. Wang, C. Zhou, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, S. Bhargava, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, M. Costanzi, M. Crocce, L. N. da Costa, J. De Vicente, J. DeRose, S. Desai, J. P. Dietrich, T. F. Eifler, J. Elvin-Poole, I Ferrero, B. Flaugher, P. Fosalba, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, D. Huterer, D. J. James, S. Kent, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, H. Lin, M. A. G. Maia, M. March, J. L. Marshall, P. Martini, P. Melchior, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, E. Neilsen, R. L. C. Ogando, S. Pandey, A. K. Romer, A. Roodman, M. Sako, E. Sanchez, V Scarpine, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, A. R. Walker, W. Wester, R. D. Wilkinson, J. Zuntz
Summary: The Dark Energy Survey (DES) Deep Fields are a collection of images and associated multiwavelength catalogues built from DECam and VISTA data. The catalogue provides comprehensive coverage of 11 fields and is a valuable resource for cosmology analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
T. Westmeier, N. Deg, K. Spekkens, T. N. Reynolds, A. X. Shen, S. Gaudet, S. Goliath, M. T. Huynh, P. Venkataraman, X. Lin, T. O'Beirne, B. Catinella, L. Cortese, H. Denes, A. Elagali, B-Q For, G. I. G. Jozsa, C. Howlett, J. M. van der Hulst, R. J. Jurek, P. Kamphuis, V. A. Kilborn, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, C. Murugeshan, J. Rhee, P. Serra, L. Shao, L. Staveley-Smith, J. Wang, O. Wong, M. A. Zwaan, J. R. Allison, C. S. Anderson, Lewis Ball, D. C-J Bock, D. Brodrick, J. D. Bunton, F. R. Cooray, N. Gupta, D. B. Hayman, E. K. Mahony, V. A. Moss, A. Ng, S. E. Pearce, W. Raja, D. N. Roxby, M. A. Voronkov, K. A. Warhurst, H. M. Courtois, K. Said
Summary: The WALLABY pilot data release 1 is the first public release of H I pilot survey data from the Wide-field ASKAP L-band Legacy All-sky Blind Survey. It covers three 60 deg(2) regions on the sky targeting nearby galaxy clusters and groups, with a relatively low median redshift. The survey has uncovered technical issues and artefacts that are expected to be addressed before the full WALLABY survey.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2022)
Article
Astronomy & Astrophysics
Igor D. Karachentsev, Elena Kaisina, Valentina E. Karachentseva
Summary: The search for new dwarf galaxies in the Leo-I group using DECaLS data resulted in the discovery of five presumed members near M 105(NGC 3379). The group currently has 83 galaxies, with 33 having measured radial velocities. More than half of the group members belong to early types with no ongoing star formation. The M 105 group is characterized by a radial velocity dispersion of 136 km s(-1), orbital mass estimate of (5.76 +/- 1.32) x 10(12) M-?, and total mass-to-luminosity ratio of (17.8 +/- 4.1) M-?/L-?. The neighbouring group around M 66(NGC 3627) has similar properties. Additionally, a group of six galaxies with unusually low virial mass-to-luminosity ratio was noted in the background of the M 105 group.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
R. Nevin, L. Blecha, J. Comerford, J. Simon, B. A. Terrazas, R. S. Barrows, J. A. Vazquez-Mata
Summary: Identifying and classifying galaxy mergers accurately is challenging, particularly by their mass ratio or merger stage. In this study, a classification technique based on linear discriminant analysis is applied to 1.3 million galaxies from the SDSS DR16 photometric catalogue, providing the probability of each galaxy being a major or minor merger, categorized by merger stages. The results demonstrate the importance of mass completeness and mass binning in understanding the trends of major merger fraction with stellar mass and redshift, suggesting a hierarchical assembly scenario and the dominance of baryonic feedback in the local Universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. H. H. Chan, C. Lemon, F. Courbin, R. Gavazzi, B. Clement, M. Millon, E. Paic, K. Rojas, E. Savary, G. Vernardos, J-C Cuillandre, S. Fabbro, S. Gwyn, M. J. Hudson, M. Kilbinger, A. McConnachie
Summary: We report the discovery of five new doubly imaged lensed quasars from the ongoing Canada-France Imaging Survey (CFIS). By utilizing CFIS imaging data, we confirmed the existence of multiple point sources with similar color and brightness, and selected suitable candidates for spectroscopic follow-up analysis.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Ian D. Roberts, Laura C. Parker, Stephen Gwyn, Michael J. Hudson, Raymond Carlberg, Alan McConnachie, Jean-Charles Cuillandre, Kenneth C. Chambers, Pierre-Alain Duc, Hisanori Furusawa, Raphael Gavazzi, Vanessa Hill, Mark E. Huber, Rodrigo Ibata, Martin Kilbinger, Simona Mei, Yannick Mellier, Satoshi Miyazaki, Masamune Oguri, Richard J. Wainscoat
Summary: Through a search across more than 50 spectroscopically selected SDSS groups and clusters, we identified 48 ram pressure candidate galaxies, which are generally low-mass galaxies with enhanced star formation rates compared to galaxies in the field. These candidates are predominantly found in groups and clusters, with the enhancement in star formation rates being independent of galaxy mass and most pronounced in clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Nicolas F. Martin, Kim A. Venn, David S. Aguado, Else Starkenburg, Jonay I. Gonzalez Hernandez, Rodrigo A. Ibata, Piercarlo Bonifacio, Elisabetta Caffau, Federico Sestito, Anke Arentsen, Carlos Allende Prieto, Raymond G. Carlberg, Sebastien Fabbro, Morgan Fouesneau, Vanessa Hill, Pascale Jablonka, Georges Kordopatis, Carmela Lardo, Khyati Malhan, Lyudmila I. Mashonkina, Alan W. McConnachie, Julio F. Navarro, Ruben Sanchez-Janssen, Guillaume F. Thomas, Zhen Yuan, Alessio Mucciarelli
Summary: Stellar ejecta gradually enrich the gas, forming fossilized structures of the early Universe. However, the least chemically enriched stellar systems have not been found in globular clusters. Recent observations of a stellar stream with extremely low metallicity suggest the existence of stellar clusters with lower metallicity in the past, contributing to the Milky Way halo.
Article
Astronomy & Astrophysics
Mojtaba Taheri, Alan W. McConnachie, Paolo Turri, Davide Massari, David Andersen, Giuseppe Bono, Giuliana Fiorentino, Kim Venn, Jean-Pierre Veran, Peter B. Stetson
Summary: This article introduces a research on observing the core of NGC 6723 using a multiconjugate adaptive optics system to understand the astrometric performance. New methods were developed to measure the astrometric distortion fields of the observing system, and the feasibility of the method was empirically demonstrated. The research results are of great value for measuring and monitoring the astrometric performance of future instruments.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Yanbin Yang, Roger Ianjamasimanana, Francois Hammer, Clare Higgs, Brenda Namumba, Claude Carignan, Gyula I. G. Jozsa, Alan W. McConnachie
Summary: Dwarf galaxies are susceptible to environmental mechanisms and the presence of nearby large galaxies can cause mass and gas loss through gravitational effects and ram-pressure stripping. New observations of Wolf-Lundmark-Melotte (WLM) show that it is undergoing ram-pressure stripping, indicating the presence of an intergalactic, gaseous reservoir far from large galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Elisabeth Sola, Pierre-Alain Duc, Felix Richards, Adeline Paiement, Mathias Urbano, Julie Klehammer, Michal Bilek, Jean-Charles Cuillandre, Stephen Gwyn, Alan McConnachie
Summary: This study aims to characterize and obtain quantitative measurements of low surface brightness (LSB) structures identified in deep images of hundreds of galaxies. An online annotation tool was developed to precisely delineate the shapes of these structures, and all parameters were stored in a database. The analysis of 352 nearby massive galaxies revealed that tidal structures defined as streams are thinner than tails, and tidal tails appear to have a higher surface brightness. Future surveys need to consider the difference in surface brightness limits when identifying LSB structures.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Axel Guinot, Martin Kilbinger, Samuel Farrens, Austin Peel, Arnau Pujol, Morgan Schmitz, Jean-Luc Starck, Thomas Erben, Raphael Gavazzi, Stephen Gwyn, Michael J. Hudson, Hendrik Hildebrandt, Liaudat Tobias, Lance Miller, Isaac Spitzer, Ludovic Van Waerbeke, Jean-Charles Cuillandre, Sebastien Fabbro, Alan McConnachie, Yannick Mellier
Summary: This study performs the first weak-lensing analysis of CFIS r-band data over a large area of the northern sky, creating a catalog with measured shapes for 40 million galaxies. The results demonstrate a low level of systematic biases and serve as a basis for further cosmological studies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Amandine Doliva-Dolinsky, Nicolas F. Martin, Guillaume F. Thomas, Annette M. N. Ferguson, Rodrigo A. Ibata, Geraint F. Lewis, Dougal Mackey, Alan W. McConnachie, Zhen Yuan
Summary: We determine the detection limits of the search for dwarf galaxies in the Pan-Andromeda Archaeological Survey using an algorithm developed by the PAndAS team. The recovery fractions of artificial dwarf galaxies vary depending on their physical size, luminosity, and location within the surveyed area. These recovery fractions are affected by contamination from foreground stars and the stellar halo of Andromeda. The study provides important information for understanding the properties of Andromeda's satellite dwarf galaxies and the formation and evolution of dwarf galaxies in a cosmological context.
ASTROPHYSICAL JOURNAL
(2022)
Editorial Material
Astronomy & Astrophysics
Alan W. McConnachie, Christian R. Hayes, John Pazder, Michael J. Ireland, Venu M. Kalari, Richard M. McDermid, Steven Margheim
Article
Astronomy & Astrophysics
Simon E. T. Smith, Jaclyn Jensen, Joel Roediger, Federico Sestito, Christian R. R. Hayes, Alan W. W. McConnachie, Jean-Charles Cuillandre, Stephen Gwyn, Eugene Magnier, Ken Chambers, Francois Hammer, Mike J. J. Hudson, Nicolas Martin, Julio Navarro, Douglas Scott
Summary: We have discovered a new ultra-faint dwarf galaxy candidate called Bootes V. It was detected as a resolved overdensity of stars during an ongoing search for new Local Group dwarf galaxy candidates in the UNIONS photometric data set. Bootes V has a physical half-light radius of 26.9(-5.4)(+7.5) pc, a V-band magnitude of -4.5 +/- 0.4 mag, and is located at a heliocentric distance of approximately 100 kpc. Using Gaia DR3 astrometry, we have identified member stars, characterized the systemic proper motion, and confirmed the reality of this faint stellar system. The spectroscopic analysis shows that Bootes V is larger, more distant, and more metal-poor than most globular clusters, suggesting that it is an ultra-faint dwarf galaxy but further studies are needed for definitive classification.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Amandine Doliva-Dolinsky, Nicolas F. Martin, Zhen Yuan, Alessandro Savino, Daniel R. Weisz, Annette M. N. Ferguson, Rodrigo A. Ibata, Stacy Y. Kim, Geraint F. Lewis, Alan W. McConnachie, Guillaume F. Thomas
Summary: We built a statistical framework to infer the global properties of the satellite system of the Andromeda galaxy (M31) using the properties of individual dwarf galaxies in a specific survey. This framework helped us determine the slope of the luminosity function, the spatial density distribution, and the size-luminosity relation of the dwarf galaxies. We found that there are still many faint or distant dwarf galaxies yet to be discovered around Andromeda.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Christian R. Hayes, Kim A. Venn, Fletcher Waller, Jaclyn Jensen, Alan W. Mcconnachie, John Pazder, Federico Sestito, Andre Anthony, Gabriella Baker, John Bassett, Joao Bento, Trystyn Berg, Gregory Burley, Jurek Brzeski, Scott Case, Edward Chapin, Timothy Chin, Eric Chisholm, Vladimir Churilov, Adam Densmore, Ruben Diaz, Jennifer Dunn, Michael Edgar, Tony Farrell, Veronica Firpo, Joeleff Fitzsimmons, Juan Font-Serra, Javier Fuentes, Colin Ganton, Manuel Gomez-Jimenez, Tim Hardy, David Henderson, Alexis Hill, Brian Hoff, Michael Ireland, Venu Kalari, Neal Kelly, Urs Klauser, Yuriy Kondrat, Kathleen Labrie, Sam Lambert, Lance Luvaul, Jon Lawrence, Jordan Lothrop, G. Scott Macdonald, Slavko Mali, Steve Margheim, Richard Mcdermid, Helen Mcgregor, Bryan Miller, Felipe Miranda, Rolf Muller, Jon Nielsen, Ryan Norbury, Oliver Oberdorf, Naveen Pai, Gabriel Perez, Pablo Prado, Ian Price, Carlos Quiroz, Vladimir Reshetov, Gordon Robertson, Roque Ruiz-Carmona, Ricardo Salinas, Kim M. Sebo, Andrew Sheinis, Matthew Shetrone, Keith Shortridge, Katherine Silversides, Karleyne Silva, Chris Simpson, Greg Smith, Kei Szeto, Julia Tims, Eduardo Toro, Cristian Urrutia, Sudharshan Venkatesan, Lewis Waller, Ivan Wevers, Ramunas Wierzbicki, Marc White, Peter Young, Ross Zhelem
Summary: This paper presents the first science results from the GHOST spectrograph and its observations of a benchmark star and stars in the Reticulum II dwarf galaxy. The candidate member GDR3 0928 is confirmed to be a member of Ret ii and exhibits abundance patterns similar to CEMP-no stars in other ultrafaint dwarf galaxies, which are believed to be produced by faint supernovae.
ASTROPHYSICAL JOURNAL
(2023)
Proceedings Paper
Instruments & Instrumentation
Vlad Reshetov, John Pazder, Anthony Andre, Alan McConnachie, Greg Burley
Summary: This paper presents the mechanical design and optical alignment of the lens barrels used for the two cameras in the GHOST instrument. A divide and conquer approach was used to align the cameras, and flexures were used for stability. The design of the optical cells provides low-stress restraint and long-term mechanical stability.
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX
(2022)
Proceedings Paper
Astronomy & Astrophysics
Gaetano Sivo, Julia Scharwachter, Manuel Lazo, Celia Blain, Stephen Goodsell, Marcos van Dam, Martin Tschimmel, Henry Roe, Jennifer Lotz, Kim Tomassino-Reed, William Rambold, Courtney Raich, Ricardo Cardenes, Angelic Ebbers, Tim Gaggstatter, Pedro Gigoux, Thomas Schneider, Charles Cavedoni, Stacy Kang, Stanislas Karewicz, Heather Carr, Jesse Ball, Paul Hirst, Emmanuel Chirre, John White, Lindsay Magill, Molly Grogan, Anne Jordan, Suresh Sivanandam, Masen Lamb, Adam Muzzin, Eduardo Marin, Scott Chapman, Jennifer Dunn, Dan Kerley, Jean-Pierre Veran, Morten Andersen, Franck Marchis, Ruben Diaz, John Blakeslee, Michael Pierce, Rodrigo Carrasco, Hwyhyun Kim, Anja Feldmeier-Krause, Alan McConnachie, James Jee, Wesley Fraser, Mark Ammons, Christopher Packham, John Bally, Trent Dupuy, Daniel Huber, Marie Lemoine-Busserole, Thomas Puzia, Paolo Turri, Chadwick Trujillo, Janice Lee
Summary: GNAO is an upcoming adaptive optics facility that will provide state-of-the-art AO system for Gemini North, catering to surveys and time domain science in the era of JWST and Rubin operations. It will optimize the Gemini infrared Multi Object Spectrograph (GIRMOS) and also include the development of a new laser guide star facility and other associated projects.
ADAPTIVE OPTICS SYSTEMS VIII
(2022)
Proceedings Paper
Engineering, Multidisciplinary
Masen Lamb, Suresh Sivanandam, Martin Tschimmel, Adam Muzzin, Alan McConnachie, Julia Scharwachter, Gaetano Sivo, Jenny Atwood, Scott Chapman, Scott Christie, Mark Barnet, Paul Hickson, Glen Herriot
Summary: GIRMOS is a versatile instrument that combines an imager and imaging spectrograph, and it is equipped with multi-object adaptive optics (MOAO) to provide exceptional science and demonstrate the capabilities of future extremely large telescopes. It offers a substantial suite of science programs and unique observations, complementing the James Webb Space Telescope (JWST).
MODELING, SYSTEMS ENGINEERING, AND PROJECT MANAGEMENT FOR ASTRONOMY X
(2022)