Article
Astronomy & Astrophysics
Nestor Espino-Briones, Pablo G. Perez-Gonzalez, Jaime Zamorano, Lucia Rodriguez-Munoz
Summary: In this study, we investigate the properties of the stellar populations of 111 massive dusty starburst galaxies at 0.7 < z < 1.2. We find that these galaxies exhibit a recent star formation episode superimposed on a more evolved stellar population. The duration of the starburst phase is estimated to be around 160 million years, with the added stellar mass accounting for approximately 40% of the median stellar mass in the sample.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Iris Breda, Jose M. Vilchez, Polychronis Papaderos, Leandro Cardoso, Ricardo O. Amorin, Antonio Arroyo-Polonio, Jorge Iglesias-Paramo, Carolina Kehrig, Enrique Perez-Montero
Summary: Extreme emission line galaxies (EELGs) are considered as local prototypes of early galaxies in the cosmic noon. Stellar properties of 414 EELGs were recovered using the spectral synthesis code FADO. Comparative analysis with the purely stellar code STARLIGHT and a sample of 697 normal star-forming galaxies was carried out. The study emphasizes the importance of considering nebular emission in spectral synthesis for accurate determination of the physical and evolutionary properties of EELGs.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
L. Colina, A. Crespo Gomez, J. Alvarez-Marquez, A. Bik, F. Walter, L. Boogaard, A. Labiano, F. Peissker, P. Perez-Gonzalez, G. Ostlin, T. R. Greve, H. U. Norgaard-Nielsen, G. Wright, A. Alonso-Herrero, R. Azollini, K. I. Caputi, D. Dicken, M. Garcia-Marin, J. Hjorth, O. Ilbert, S. Kendrew, J. P. Pye, T. Tikkanen, P. van der Werf, L. Costantin, E. Iani, S. Gillman, I. Jermann, D. Langeroodi, T. Moutard, P. Rinaldi, M. Topinka, E. F. van Dishoeck, M. Guedel, Th. Henning, P. O. Lagage, T. Ray, B. Vandenbussche
Summary: Luminous infrared galaxies at high redshifts (z > 4) have extreme starbursts that form their stellar mass in short periods of time. This study presents the first spatially resolved near-infrared imaging of GN20, a very luminous dusty star-forming galaxy observed at an epoch when the Universe was only 1.5 Gyr old.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Eunbin Kim, Ho Seong Hwang, Woong-Seob Jeong, Seong Jin Kim, Denis Burgarella, Tomotsugu Goto, Tetsuya Hashimoto, Young-Soo Jo, Jong Chul Lee, Matthew Malkan, Chris Pearson, Hyunjin Shim, Yoshiki Toba, Simon C-C Ho, Daryl Joe Santos, Hiroyuki Ikeda, Helen K. Kim, Takamitsu Miyaji, Hideo Matsuhara, Nagisa Oi, Toshinobu Takagi, Ting-Wen Wang
Summary: The study reveals that the merger fractions of galaxies increase with redshift, with the merger fractions of starbursts higher than those of main-sequence and quiescent galaxies in all redshift bins. Herschel-detected galaxies have higher merger fraction compared to non-Herschel-detected galaxies, and both types show clearly different merger fractions depending on the star formation modes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Evgenii O. Vasiliev, Sergey A. Drozdov, Biman B. Nath, Ralf-Juergen Dettmar, Yuri A. Shchekinov
Summary: This study investigates the dynamics and emission of growing superbubbles in a stratified interstellar gaseous disc, driven by energy release from supernovae explosions in stellar clusters. The researchers find that discrete energy injection by isolated supernovae is more efficient in blowing superbubbles, allowing them to reach heights of up to 3 to 16 kiloparsecs and remain filled with hot and dilute plasma for at least 30 million years. The results of this study have implications for the understanding of X-ray, H alpha, and dust infrared emissions, as well as the origins of certain astronomical features. Rating: 8 out of 10.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sami Dib
Summary: We calculated the stellar integrated galactic initial mass function (IGIMF) in the presence of cluster-to-cluster variations of the IMR. The results showed that variations of the IMF parameters significantly affected the characteristic mass of the IGIMF, which in turn impacted star formation in galaxies. This provided a simple explanation for the bottom-heavy stellar mass function observed in early-type galaxies. IMF variations were found to be a dominant factor affecting the IGIMF, especially in regions of low metallicity, while variations in the slope of the initial cluster mass function (ICLMF) could dominate in regions of high metallicity.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Leandro S. M. Cardoso, Jean Michel Gomes, Polychronis Papaderos, Ciro Pappalardo, Henrique Miranda, Ana Paulino-Afonso, Jose Afonso, Patricio Lagos
Summary: This study aims to estimate the relations between stellar properties of star-forming galaxies by simultaneously fitting the stellar and nebular continua and comparing them to the results derived through purely stellar spectral synthesis. The results show differences in average mass, mean age, and mean metallicity values between different population synthesis codes, highlighting the impact of the nebular continuum modeling approach on the inferred properties of galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Bik, G. Ostlin, M. Hayes, J. Melinder, V Menacho
Summary: This study investigates the kinematics of nearby starburst galaxies selected from SDSS data. The results show a correlation between the rotational velocity and velocity dispersion of the gas and stellar components, and propose a scenario where gravitational instabilities determine the global kinematics of galaxies. The study highlights the importance of understanding the physics and assembly history of galaxies.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
U. Dudzeviciute, Ian Smail, A. M. Swinbank, C-F Lim, W-H Wang, J. M. Simpson, Y. Ao, S. C. Chapman, C-C Chen, D. Clements, H. Dannerbauer, L. C. Ho, H. S. Hwang, M. Koprowski, C-H Lee, D. Scott, H. Shim, R. Shirley, Y. Toba
Summary: This study analyzes the physical properties of sub-millimetre galaxies from different radio surveys, comparing the fundamental physical differences and dominant obscured populations at different redshifts. Additionally, the research establishes samples to probe the evolution of galaxy populations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Matthew J. Hayes, Axel Runnholm, Claudia Scarlata, Max Gronke, T. Emil Rivera-Thorsen
Summary: We investigate the influence of stellar and nebular conditions on the emission and spectral profile of the H i Lyα emission line in star-forming galaxies. Using spectroscopy from the Cosmic Origins Spectrograph on the Hubble Space Telescope, we analyze 87 galaxies at redshift z = 0.05-0.44. We find strong correlations between the Lyα escape fraction and ionization parameter, as well as the contribution of blueshifted emission to the total Lyα. We also identify key predictive variables for Lyα luminosity and equivalent width. Our results have implications for high-redshift observations and the study of cosmic reionization.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Luigi Bassini, Robert Feldmann, Jindra Gensior, Christopher C. Hayward, Claude-Andre Faucher-Giguere, Elia Cenci, Lichen Liang, Mauro Bernardini
Summary: Recent observations indicate that galactic outflows are common in high-redshift galaxies, but stellar feedback is inefficient in driving these outflows. The results suggest that high-redshift massive systems have higher total and gas surface densities.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. K. Humire, C. Henkel, A. Hernandez-Gomez, S. Martin, J. Mangum, N. Harada, S. Muller, K. Sakamoto, K. Tanaka, Y. Yoshimura, K. Nakanishi, S. Muhle, R. Herrero-Illana, D. S. Meier, E. Caux, R. Aladro, R. Mauersberger, S. Viti, L. Colzi, V. M. Rivilla, M. Gorski, K. M. Menten, K. -Y. Huang, S. Aalto, P. P. van der Werf, K. L. Emig
Summary: This study detects methanol masers above 84 GHz for the first time in NGC 253, confirming the presence of Class I maser line and suggesting weak shocks and cloud-cloud collisions as the physical conditions for maser excitation. The lack of Class I maser candidates in the central star-forming disk may be explained by the presence of photodissociation regions due to a high star-formation rate.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
S. Comeron
Summary: Thick discs may have formed quickly in situ from turbulent clumpy discs, with thin discs forming slowly within them. Observational tests suggest a positive correlation between the age of the youngest stars in thick discs and the stellar mass of the host galaxy. While field spiral galaxies seem to align with this prediction, lenticular galaxies exhibit younger thick disc ages than expected, indicating a fast early evolution for S0 galaxies.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
J. Cairns, D. L. Clements, J. Greenslade, G. Petitpas, T. Cheng, Y. Ding, A. Parmar, I Perez-Fournon, D. Riechers
Summary: In this study, we conducted observations using SCUBA-2 and SMA to investigate four candidate high-redshift dusty star-forming galaxies. We detected multiple systems in three of the sources, indicating the presence of additional sources below the SMA detection limit. Photometric redshift estimates suggest that three of the sources are likely at z >= 2. Furthermore, the analysis of SCUBA-2 850 mu m maps revealed that one of the sources could potentially reside in a z >= 2 protocluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Haojing Yan, Chenxiaoji Ling, Zhiyuan Ma
Summary: This article presents an analysis of the optical-to-near-infrared counterparts of candidate dusty starbursts at z > 6. The positions of these objects have been determined through millimeter and/or radio interferometry, allowing for the search of their counterparts in deep optical-to-near-infrared images. The analysis reveals the identification of three counterparts, photometric redshift solutions ranging from 7.5 to 9.0, and the inference of their total IR luminosities and star formation rates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Andrey Vayner, Shelley A. Wright, Norman Murray, Lee Armus, Anna Boehle, Maren Cosens, James E. Larkin, Etsuko Mieda, Gregory Walth
Summary: Detailed observations were presented for 11 z = 1.39-2.59 radio-loud quasar host galaxies, showing extended ionized emission photoionized by various sources and differences in emission-line ratios due to lower gas-phase metallicities. The quasar host galaxies were found to be undermassive relative to their central supermassive black hole mass, requiring substantial growth to reach the scaling relationship observed in local galaxies. Feedback effects from winds were also identified before these galaxies reach the enrichment level observed in local galaxies with AGN.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Andrey Vayner, Nadia L. Zakamska, Rogemar A. Riffel, Rachael Alexandroff, Maren Cosens, Fred Hamann, Serena Perrotta, David S. N. Rupke, Thaisa Storchi Bergmann, Sylvain Veilleux, Greg Walth, Shelley Wright, Dominika Wylezalek
Summary: Research findings suggest that the galactic-scale outflows driven by extreme red quasars are likely powered by radiation pressure in high column density environments or adiabatic shock, carrying significant amounts of energy and impacting the host galaxies of the quasars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Yicheng Guo, Timothy Carleton, Eric F. Bell, Zhu Chen, Avishai Dekel, S. M. Faber, Mauro Giavalisco, Dale D. Kocevski, Anton M. Koekemoer, David C. Koo, Peter Kurczynski, Seong-Kook Lee, F. S. Liu, Casey Papovich, Pablo G. Perez-Gonzalez
Summary: By using COSMOS data, this study investigates the relationship between quenching and stellar mass density within the central radius of low-mass galaxies at 0.5≤z<1.5. It is found that low-mass quenched galaxies have higher mass density compared to star-forming galaxies, with the difference decreasing at higher stellar masses. The mass density of galaxies increases in the green valley regardless of stellar mass, with estimates indicating a quenching timescale of around 4 billion years for low-mass galaxies at 0.5≤z<1.0.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Christopher J. Agostino, Samir Salim, S. M. Faber, Stephanie Juneau, David C. Koo, Yimeng Tang, Yifei Luo, Sofia Quiros, Pin-Song Zhao
Summary: The study found that mixing is not the principal cause of the extended morphology of the observed branch, but rather Seyferts/LINERs intrinsically have a wide range of line ratios. Variations in ionization parameter and metallicity can explain much of the diversity of Seyfert/LINER line ratios.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Andrey Vayner, Nadia Zakamska, Shelley A. Wright, Lee Armus, Norman Murray, Gregory Walth
Summary: By using ALMA and high spatial resolution data, this study observed molecular gas outflows in high-redshift radio-loud quasar host galaxies, finding that molecular gas dominates the outflow mass and suggesting that quasar feedback is a major mechanism of gas depletion. As the gas outflow rates exceed star formation rates, the study examined the impact of radio jet outflows as negative feedback in shaping the evolution of massive galaxies.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Andrey Vayner, Shelley A. Wright, Norman Murray, Lee Armus, Anna Boehle, Maren Cosens, James E. Larkin, Etsuko Mieda, Gregory Walth
Summary: Observations show high-velocity ionized gas outflows in radio-loud quasar host galaxies, possibly driven by energy-conserving shocks. These outflows play a dominant role in gas depletion, and their paths align with the orientation of the jets.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Weichen Wang, Susan A. Kassin, S. M. Faber, David C. Koo, Emily C. Cunningham, Hassen M. Yesuf, Guillermo Barro, Puragra Guhathakurta, Benjamin J. Weiner, Alexander de la Vega, Yicheng Guo, Timothy M. Heckman, Camilla Pacifici, Bingjie Wang, Charlotte Welker
Summary: The study suggests that cool galactic winds at z greater than or similar to 1 might be commonly launched from the entire spatial extents of their host galaxies, due to extended galaxy star formation.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Maren Cosens, Shelley A. Wright, Norman Murray, Lee Armus, Karin Sandstrom, Tuan Do, Kirsten Larson, Gregory Martinez, Sanchit Sabhlok, Andrey Vayner, James Wiley
Summary: In this study, we surveyed the central region of the nearby starburst galaxy IC 10 using the high spectral and spatial resolution Keck Cosmic Web Imager. The results show that the H II regions in IC 10 are expanding, likely driven by feedback, and warm gas pressure dominates the outward pressure. Additionally, evidence of outflows supported by stellar winds or champagne flows was found.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Eric Steinbring
Summary: The effects of long-term atmospheric change were investigated using photometry data from the Gemini North and South twin Multi-Object Spectrograph. The analysis revealed an exceptional episode of extinction in 2009 and a consistent trend of worsening attenuation at both sites. These findings are supported by solar-radiance transmissivity records, aerosol density measurements, and increasing air temperature, and have implications for the calibration of historic data sets and future surveys.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2022)
Proceedings Paper
Instruments & Instrumentation
Marc Kassis, Steven L. Allen, Carlos Alverez, Ashley Baker, Ravinder K. Banyal, Robert Bertz, Charles Beichman, Aaron Brown, Matthew Brown, Kevin Bundy, Gerald Cabak, Sylvain Cetre, Jason Chin, Mark R. Chun, Jeff Cooke, Jacques Delorme, William Deich, Richard G. Dekany, Mark Devenot, Greg Doppmann, Jerry Edelstein, Michael P. Fitzgerald, Jason R. Fucik, Maodong Gao, Steve Gibson, Peter R. Gillingham, Percy Gomez, Colby Gottschalk, Sam Halversonm, Grant Hill, Philip Hinz, Bradford P. Holden, Andrew W. Howard, Tucker Jones, Nemanja Jovanovic, Evan Kirby, Shanti Krishnan, Renate Kupke, Kyle Lanclos, James E. Larkin, Stephanie D. Leifer, Hilton A. Lewis, Scott Lilley, Jessica R. Lu, James E. Lyke, Nicholas MacDonald, Christopher Martin, John Mather, Mateusz Matuszewski, Dimitri Mawet, Ben McCarney, Rosalie McGurk, Eduardo Marin, Maxwell A. Millar-Blanchaer, Craig Nance, Reston B. Nash, James D. Neill, John M. O'Meara, Eliad Peretz, Claire Poppett, Quinn Konopacky, Matthew V. Radovan, Sam Ragland, Kodi Rider, Mitsuko Roberts, Connie Rockosi, Arpita Roy, Ryan Rubenzahl, Stephanie Sallum, Dale Sandford, Maureen Savage, Boqiang Shen, Sunil Simha, Andy J. Skemer, Charles C. Steidel, Deno Stelter, Avinash Surendran, James Thorne, Josh Walawender, Kyle B. Westfall, Peter Wizinowich, Kerry Vahala, Shelley Wright, Truman Wold, Sherry Yeh
Summary: This paper summarizes the recently commissioned infrastructure projects, technology upgrades, and new additions to the suite of instrumentation at the W. M. Keck Observatory. It also provides a status update on projects currently in design or development phases, as well as projects in exploratory phases that originate from the observatory's strategic plan updated in 2022.
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX
(2022)
Proceedings Paper
Instruments & Instrumentation
Jerome Maire, Shelley A. Wright, Jamie Holder, David Anderson, Wystan Benbow, Aaron Brown, Maren Cosens, Gregory Foote, William F. Hanlon, Olivier Hervet, Paul Horowitz, Andrew W. Howard, Ryan Lee, Wei Liu, Rick Raffanti, Nicolas Rault-Wang, Remington P. S. Stone, Dan Werthimer, James Wiley, David A. Williams
Summary: Optical SETI instruments provide an opportunity for new discoveries, complementing multimessenger and time domain astrophysics by exploring the fast time domain with large sky coverage. The Panoramic SETI experiment (PANOSETI) aims to observe optical transients over a wide field-of-view using assembled telescopes. Recently, PANOSETI successfully detected astrophysical gamma rays emitted by the Crab Nebula, confirming its effectiveness.
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX
(2022)
Proceedings Paper
Instruments & Instrumentation
James Wiley, Aaron Brown, Renate Kupke, Maren Cosens, Shelley A. Wright, Michael Fitzgerald, Chris Johnson, Tucker Jones, Marc Kassis, Evan Kress, James E. Larkin, Kenneth Magnone, Rosalie McGurk, Nils Rundquist, Eric Wang, Sherry Yeh
Summary: Liger is an adaptive optics system designed for the W.M. Keck Observatory, comprising an imager and an integral field spectrograph. The design and analysis of the optical assembly for the imager and the re-imaging optics for the spectrograph are presented. The components will be tested in a cryogenic chamber before being installed in the final science cryostat.
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IX
(2022)
Proceedings Paper
Astronomy & Astrophysics
Nils-Erik Rundquist, Andrea Zonca, Arun Surya, Shelley A. Wright, Aaron Brown, Maren Cosens, Michael Fitzgerald, Chris Johnson, Marc Kassis, Renate Kupke, Kyle Lanclos, James E. Larkin, Kenneth G. Magnone, Rosalie C. McGurk, Ji Man Sohn, Gregory Walth, James H. Wiley, Sherry Yeh
Summary: Liger is a second generation near-infrared imager and integral field spectrograph for the W. M. Keck Observatory. It utilizes the capabilities of the Keck All-sky Precision Adaptive-optics system and offers a variety of modes for astronomers to choose from. To handle the complex raw data and deliver science-ready data products, Liger must be designed in conjunction with a Data Reduction System. This article presents the initial design for the DRS and defines the interfaces between observatory and instrument software systems.
SOFTWARE AND CYBERINFRASTRUCTURE FOR ASTRONOMY VII
(2022)
Proceedings Paper
Astronomy & Astrophysics
David R. Andersen, Jenny Atwood, Jennifer Dunn, Jeffrey Crane, Brian Hoff, Ed Chapin, Glen Herriot, Tim Hardy, Lianqi Wang, James Larkin, Shelley Wright, Ryuji Suzuki, Robert Weber, Tim Greffe
Summary: IRIS is a diffraction-limited imaging spectrograph designed for the Thirty Meter Telescope (TMT), responsible for sensing low order modes that the NFIRAOS Laser Guide Star (LGS) Wavefront Sensors (WFSs) are blind to. During the final design process, a noise-equivalent angle budget was developed, taking into account various factors to determine the design of optics, mechanics, and detectors.
ADAPTIVE OPTICS SYSTEMS VIII
(2022)
Proceedings Paper
Astronomy & Astrophysics
P. Wizinowich, J. R. Lu, S. Cetre, J. Chin, C. Correia, J. -R. Delorme, L. Gers, S. Lilley, J. Lyke, E. Marin, S. Ragland, P. Richards, A. Surendran, E. Wetherell, C. -F. Chen, D. Chu, T. Do, C. Fassnacht, M. Freeman, A. Gautam, A. Ghez, L. Hunter, T. Jones, M. C. Liu, D. Mawet, C. Max, M. Morris, M. Phillips, J. -B. Ruffio, N. -E. Rundquist, S. Sabhlok, S. Terry, T. Treu, S. Wright
Summary: This article presents the status and plans of the Keck All sky Precision Adaptive Optics (KAPA) program, including upgrades, key science programs, and an educational component. The focus is on the upgrades, such as the implementation of a laser asterism generator and wavefront sensor, as well as the results of calibrations and testing.
ADAPTIVE OPTICS SYSTEMS VIII
(2022)