Article
Astronomy & Astrophysics
Daniel P. Cohen, Jean L. Turner, Sara C. Beck, S. Michelle Consiglio
Summary: We report Keck-NIRSPEC observations of the Brackett alpha 4.05 mu m recombination line across the two candidate embedded super star clusters (SSCs) in NGC 1569. These SSCs power a bright H II region and have been previously detected as radio and mid-infrared sources. Supplemented with high-resolution VLA mapping of the radio continuum along with IRTF-TEXES spectroscopy of the [S IV] 10.5 mu m line, the Brackett alpha data provide new insight into the dynamical state of gas ionized by these forming massive clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Sanchez-Cruces, M. M. Sardaneta, I Fuentes-Carrera, M. Rosado, N. Cardenas-Martinez, M. A. Lara-Lopez
Summary: In this study, we used Fabry-Perot observations to investigate the kinematics of NGC 1569 and computed its H alpha velocity field. Our analysis identified the origin of most motions in the galaxy and ruled out the possibility of deriving a rotation curve. We also analyzed the kinematics of supernova remnants in NGC 1569 and determined their physical properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
L. E. Garduno, J. Zaragoza-Cardiel, M. A. Lara-Lopez, I. A. Zinchenko, M. C. Zerbo, M. E. De Rossi, Jacopo Fritz, Sami Dib, L. S. Pilyugin, M. Sanchez-Cruces, V. Heesen, S. P. O'Sullivan, O. Lopez-Cruz, M. Valerdi, Margarita Rosado
Summary: In this study, several panchromatic scaling relations for the dwarf irregular galaxy NGC 1569 were investigated using Integral Field Unit (IFU) data. The results showed different slopes compared to previous reports, with higher correlations and lower scatter in the star formation main sequence and molecular Kennicutt-Schmidt relation. The relationships involving metallicity, stellar mass, and gas fraction were found to have flat shapes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Ozdogan Ela, A. Akyuz, N. Aksaker, S. Avdan, I. Akkaya Oralhan, A. Vinokurov, S. Allak, Y. Solovyeva, K. Atapin, D. Bizyaev
Summary: The study uses archival data from the Hubble Space Telescope to search for optical candidates of ultraluminous X-ray sources in two dwarf galaxies, confirming associations with young star groups and HII complexes. The X-ray spectral data suggest that the sources are in luminous hard states, consistent with long-term observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Kelly F. Heckler, Tiago Ricci, Rogemar A. Riffel
Summary: This study presents a detailed analysis of the ionized gas distribution and kinematics in NGC 4546, revealing the presence of an active galactic nucleus, evolved stars, and various components of gas flow in the central region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sabine Thater, Davor Krajnovic, Peter M. Weilbacher, Dieu D. Nguyen, Martin Bureau, Michele Cappellari, Timothy A. Davis, Satoru Iguchi, Richard McDermid, Kyoko Onishi, Marc Sarzi, Glenn van de Ven
Summary: This article presents a cross-comparison of various methods and kinematic tracers to estimate the supermassive black hole mass in the nearby fast-rotating early-type galaxy NGC 6958. The results show discrepancies and potential systematic uncertainty, highlighting the need for further investigations and cross-comparisons.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
C. Buttitta, E. M. Corsini, J. A. L. Aguerri, L. Coccato, L. Costantin, V Cuomo, V. P. Debattista, L. Morelli, A. Pizzella
Summary: We examined the relationship between bar rotation rate and dark matter content in barred galaxies, focusing on NGC 4264 and NGC 4277. NGC 4264 has a fast bar that extends close to corotation, while the bar in NGC 4277 is slow and falls short of corotation. Using dynamical models and observational data, we found that NGC 4277 has a higher fraction of dark matter within the bar region compared to NGC 4264, in agreement with theoretical predictions and numerical simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tony Junjing Fan, Dae-Sik Moon, Hong Soo Park, Dennis Zaritsky, Sang Chul Kim, Youngdae Lee, Ting S. Li, Yuan Qi Ni, Jeehye Shin, Sang-Mok Cha, Yongseok Lee
Summary: We have discovered 48 new galaxies and analyzed 55 galaxies, including seven previously discovered dwarf galaxy candidates around the giant spiral galaxy NGC 2997. The characteristics and distribution of these galaxies suggest recent accretion of new massive members and that the brighter members have younger stellar populations and higher star formation activities.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Anton V. Afanasiev, Igor Chilingarian, Kirill A. Grishin, Dmitry Makarov, Lidia Makarova, Daniel Fabricant, Nelson Caldwell, Sean Moran
Summary: Low-mass early-type galaxies, including dwarf spheroidals and brighter dwarf ellipticals, dominate the galaxy population in groups and clusters. Recently, an additional population of more extended ultradiffuse galaxies has been identified, sparking a discussion on the connections between the three classifications. The spatially resolved stellar kinematics of KDG 64 suggest it is a transitional object between dwarf spheroidals and ultradiffuse galaxies, with an old stellar population, no young stars, and a high dark matter mass fraction.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Patricia da Silva, R. B. Menezes, Y. Diaz, A. Rodriguez-Ardila, E. Lopez-Navas, P. Arevalo, L. Hernandez-Garcia
Summary: The central regions of galaxies with active galactic nuclei (AGNs) are complex and require detailed study to better understand them, especially at high activity levels.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Marasco, F. Belfiore, G. Cresci, F. Lelli, G. Venturi, L. K. Hunt, A. Concas, A. Marconi, F. Mannucci, M. Mingozzi, A. F. McLeod, N. Kumari, S. Carniani, L. Vanzi, M. Ginolfi
Summary: By observing and modeling a sample of 19 galaxies with stellar masses ranging from 10⁷ to 10¹⁰ solar masses, it is found that the ionized gas in these galaxies exhibits non-circular motion and low mass outflow rates, which significantly deviate from the predictions of theoretical models. This suggests that baryonic feedback plays a gentle gas cycling role rather than causing large-scale blow-outs in low-mass galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Gabriel R. Hauschild Roier, Thaisa Storchi-Bergmann, Richard M. McDermid, Jonelle L. Walsh, Joanne Tan, Jonathan Cohn, Davor Krajnovic, Jenny Greene, Monica Valluri, Kayhan Gultekin, Sabine Thater, Glenn van de Ven, Karl Gebhardt, Nora Lutzgendorf, Benjamin D. Boizelle, Chung-Pei Ma, Aaron J. Barth
Summary: We have studied the stellar and gas distribution, excitation, and kinematics of the S0 galaxy NGC 4111 using various observational techniques. We found a dusty polar ring with a diameter of approximately 450 pc and a hot molecular gas ring with a diameter of approximately 220 pc embedded in it. The motions of the stars and gas suggest inflow towards the central nucleus, which is likely to fuel an active galactic nucleus (AGN) and trigger star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Patricia da Silva, R. B. Menezes, Y. Diaz, Elena Lopez-Navas, J. E. Steiner
Summary: The study of the nuclear regions of galaxy NGC 2442 revealed the presence of a Compton-thick AGN, outflow emission of gas, and the absence of recent star formation in the central region, possibly due to AGN feedback.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Evgeniya S. Egorova, Oleg Egorov, Alexei Moiseev, Anna S. Saburova, Kirill A. Grishin, Igor Chilingarian
Summary: Arakelian 18 is a low-mass low-surface brightness disc galaxy with a complex structure likely resulting from a dwarf-dwarf merger and accretion of a gas cloud.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Shumeng Zhang, Dougal Mackey, Gary S. Da Costa
Summary: This study presents a panoramic survey of the NGC 6822 dwarf irregular galaxy, revealing no recent interactions with a companion galaxy or any dwarf satellites around it. NGC 6822 contains a disc of H I gas and young stars, with an extended spheroid of old stellar populations. The spheroid becomes increasingly flattened and twisted at larger radii, possibly due to a past interaction with the Milky Way.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
R. D. Baldi, D. R. A. Williams, I. M. McHardy, R. J. Beswick, E. Brinks, B. T. Dullo, J. H. Knapen, M. K. Argo, S. Aalto, A. Alberdi, W. A. Baan, G. J. Bendo, S. Corbel, D. M. Fenech, J. S. Gallagher, D. A. Green, R. C. Kennicutt, H-R Kloeckner, E. Koerding, T. J. Maccarone, T. W. B. Muxlow, C. G. Mundell, F. Panessa, A. B. Peck, M. A. Perez-Torres, C. Romero-Canizales, P. Saikia, F. Shankar, R. E. Spencer, I. R. Stevens, E. Varenius, M. J. Ward, J. Yates, P. Uttley
Summary: The study presents the second data release of high-resolution radio images of 177 nearby galaxies from the Palomar sample, with 44.6% of galaxies having radio emission greater than or equal to 0.25 mJy beam(-1). The radio core luminosities range widely, with LINERs and Seyferts being the most luminous sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jeffrey L. Carlin, Burcin Mutlu-Pakdil, Denija Crnojevic, Christopher T. Garling, Ananthan Karunakaran, Annika H. G. Peter, Erik Tollerud, Duncan A. Forbes, Jonathan R. Hargis, Sungsoon Lim, Aaron J. Romanowsky, David J. Sand, Kristine Spekkens, Jay Strader
Summary: In this study, two dwarf galaxies in the halos of Large Magellanic Cloud (LMC) analogs were examined using deep Hubble Space Telescope (HST) imaging, revealing their structural parameters and stellar populations. One of the dwarfs showed recent star formation while the other contained mostly ancient, metal-poor stars. These faint dwarf satellites are among the faintest known around host galaxies of LMC mass, and their census will contribute to testing predictions from cold dark matter models and understanding the influence of low-mass hosts on the evolution of satellites.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Phil Cigan, Lisa M. Young, Haley L. Gomez, Suzanne C. Madden, Pieter De Vis, Deidre A. Hunter, Bruce G. Elmegreen, Elias Brinks
Summary: The study investigates the far-infrared photometry of low-metallicity dwarf galaxies with moderate star formation rates, finding that they have low dust masses and cooler dust temperatures with low dust-to-gas mass ratios. These galaxies are likely forming very little dust via stars or grain growth and have very high dust destruction rates.
ASTRONOMICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Pavel Jachym, Ming Sun, Masafumi Yagi, Chong Ge, Rongxin Luo, Francoise Combes, Anezka Kabatova, Jeffrey D. P. Kenney, Tom C. Scott, Elias Brinks
Summary: We report the detection of CO emission in a newly discovered isolated gas cloud in the nearby galaxy cluster Abell 1367. The cloud is located at a projected distance of > 80 kpc from any galaxy and is the first known isolated intra-cluster cloud detected in X-ray, H alpha, and CO emission. We found a total of about 2.2 x 10(8) solar masses of H-2 in the cloud, which is offset in velocity from the underlying H alpha emission by > 100 km/s in the region where the X-ray peaks. The presence of different gas phases suggests gas phase mixing with the surrounding intra-cluster medium.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Karoline M. Gilbert, Amanda C. N. Quirk, Puragra Guhathakurta, Erik Tollerud, Jennifer Wojno, Julianne J. Dalcanton, Meredith J. Durbin, Anil Seth, Benjamin F. Williams, Justin T. Fung, Pujita Tangirala, Ibrahim Yusufali
Summary: We present initial results from a large spectroscopic survey of stars in M33's stellar disk, showing the presence of a high-velocity-dispersion stellar component that may be a stellar halo. The proportion of red giant branch stars in this component decreases with increasing distance.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
T. C. Scott, L. Cortese, P. Lagos, E. Brinks, A. Finoguenov, L. Coccato
Summary: This article presents various observations of the FGC 1287 triplet, including H i and radio continuum, narrow-band H alpha imaging, IFU spectroscopy, and X-ray observations. The observations show typical signatures of ram pressure stripping (RPS) in FGC 1287, but no X-ray emission from the intracluster medium (ICM) or intragroup medium (IGM) is detected. The analysis suggests different scenarios but none of them can fully explain the origin of the long H i tail.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
R. D. Baldi, D. R. A. Williams, R. J. Beswick, I McHardy, B. T. Dullo, J. H. Knapen, L. Zanisi, M. K. Argo, S. Aalto, A. Alberdi, W. A. Baan, G. J. Bendo, D. M. Fenech, D. A. Green, H-R Klockner, E. Kording, T. J. Maccarone, J. M. Marcaide, I Mutie, F. Panessa, M. A. Perez-Torres, C. Romero-Canizales, D. J. Saikia, P. Saikia, F. Shankar, R. E. Spencer, I. R. Stevens, P. Uttley, E. Brinks, S. Corbel, I Marti-Vidal, C. G. Mundell, M. Pahari, M. J. Ward
Summary: The study combines optical line emission, black hole mass estimates, and radio data to investigate the factors determining the nuclear radio emission in local galaxies. Different types of galaxies display distinct nuclear radio emission characteristics, with specific accretion-ejection states of active black holes playing a crucial role.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Robel Geda, Steven M. Crawford, Lucas Hunt, Matthew Bershady, Erik Tollerud, Solohery Randriamampandry
Summary: PetroFit is an open-source Python package that calculates Petrosian profiles and fits galaxy images.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
V Heesen, M. Staffehl, A. Basu, R. Beck, M. Stein, F. S. Tabatabaei, M. J. Hardcastle, K. T. Chyzy, T. W. Shimwell, B. Adebahr, R. Beswick, D. J. Bomans, A. Botteon, E. Brinks, M. Brueggen, R-J Dettmar, A. Drabent, F. de Gasperin, G. Guerkan, G. H. Heald, C. Horellou, B. Nikiel-Wroczynski, R. Paladino, J. Piotrowska, H. J. A. Roettgering, D. J. B. Smith, C. Tasse
Summary: This study investigates the radio-star formation rate relationship in galaxies using low-frequency radio observations. The results show that more massive galaxies with higher star formation rates have stronger radio signals. The study also reveals variations in the radio spectral index, with steeper indices in galaxies with higher SFRs.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
John F. Wu, J. E. G. Peek, Erik J. Tollerud, Yao-Yuan Mao, Ethan O. Nadler, Marla Geha, Risa H. Wechsler, Nitya Kallivayalil, Benjamin J. Weiner
Summary: We present a method for identifying low-z galaxies based on optical imaging, and provide results on the spatial distributions of satellites around host galaxies. Using a convolutional neural network (CNN), we identify low-z galaxies and determine the true number and radial distribution of satellites. The results show that satellite richness depends on host stellar mass and morphology, while the radial distribution is independent of host characteristics. Our findings are in agreement with predictions from hydrodynamic simulations and offer statistical power for studying satellite galaxy populations.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Hannah Richstein, Ekta Patel, Nitya Kallivayalil, Joshua D. Simon, Paul Zivick, Erik Tollerud, Tobias Fritz, Jack T. Warfield, Gurtina Besla, Roeland P. van der Marel, Andrew Wetzel, Yumi Choi, Alis Deason, Marla Geha, Puragra Guhathakurta, Myoungwon Jeon, Evan N. Kirby, Mattia Libralato, Elena Sacchi, Sangmo Tony Sohn
Summary: This paper presents the observed data of the ultra-faint dwarf galaxies Peg III and Psc II, including their structures and mass-to-light ratios. By analyzing the proper motions, the possible orbital history of these galaxies is studied. Further measurements are needed to clarify their relationship.
ASTROPHYSICAL JOURNAL
(2022)
Correction
Astronomy & Astrophysics
Karoline M. Gilbert, Amanda C. N. Quirk, Puragra Guhathakurta, Erik Tollerud, Jennifer Wojno, Julianne J. Dalcanton, Meredith J. Durbin, Anil Seth, Benjamin F. Williams, Justin T. Fung, Pujita Tangirala, Ibrahim Yusufali
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
V Heesen, T-L Klocke, M. Brueggen, F. S. Tabatabaei, A. Basu, R. Beck, A. Drabent, B. Nikiel-Wroczynski, R. Paladino, S. Schulz, M. Stein
Summary: This study investigates the origin and properties of magnetic fields in late-type galaxies. By measuring the magnetic field strengths in 39 galaxies and analyzing the relations between magnetic fields and gas density, interstellar medium density, and molecular gas density, it concludes that the magnetic field is regulated by the saturation of small-scale dynamo.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. Kovakkuni, F. Lelli, P-A Duc, M. Boquien, J. Braine, E. Brinks, V. Charmandaris, F. Combes, J. Fensch, U. Lisenfeld, S. S. McGaugh, J. C. Mihos, M. S. Pawlowski, Y. Revaz, P. M. Weilbacher
Summary: Research reveals that some star-forming regions in tidal dwarf galaxies (TDGs) resemble normal spiral galaxies, while others exhibit characteristics of extreme starbursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Travis C. Fischer, Nathan J. Secrest, Megan C. Johnson, Bryan N. Dorland, Phillip J. Cigan, Luis C. Fernandez, Lucas R. Hunt, Michael Koss, Henrique R. Schmitt, Norbert Zacharias
Summary: The study presents results from an observational campaign dedicated to understanding the physical processes affecting the positions and morphologies of AGNs. Despite deep observations, 16 out of 25 AGNs in the sample were not detected on milliarcsecond scales, suggesting extended radio emission may play a role in the correlation between radio emission, X-ray emission, and black hole mass. Further comparisons between VLBA and VLA observations show a mass-independent correlation between radio and X-ray luminosities of black holes, indicating the possibility of truly radio-silent AGNs.
ASTROPHYSICAL JOURNAL
(2021)