The NGC3109 Satellite System: The First Systematic Resolved Search for Dwarf Galaxies Around a SMC-mass Host
The NGC3109 Satellite System: The First Systematic Resolved Search for Dwarf Galaxies Around a SMC-mass Host
We report the results of the deepest search to date for dwarf galaxies around NGC3109, a barred spiral galaxy with a mass similar to that of the Small Magellanic Cloud (SMC), using a semi-automated search method. Using the Dark Energy Camera (DECam), we survey a region covering a projected distance of $\sim$70 kpc of NGC 3109 ($D$ = 1.3 Mpc, $R_\mathrm{vir}\sim$ 90 kpc, $M\sim10^8M_\ast$) as part of the MADCASH and DELVE-DEEP programs. Through our resolved and newly designed semi-resolved searches, we successfully recover the known satellites Antlia and Antlia B. We identified a promising candidate, which was later confirmed to be a background dwarf through deep follow-up observations. Our detection limits are well defined, with the sample $\sim 80\%$ complete down to $M_V\sim-$8.0 , and includes detections of dwarf galaxies as faint as $M_V\sim-$6.0. This is the first comprehensive study of a satellite system through resolved star around an SMC mass host. Our results show that NGC 3109 has more bright ($M_V\sim-$9.0) satellites than the mean predictions from cold dark matter (CDM) models, but well within the host-to-host scatter. A larger sample of LMC/SMC-mass hosts is needed to test whether or not the observations are consistent with current model expectations.
Alex H. Riley、Joanna D. Sakowska、Adam Smercina、Kathy Vivas、Monika Adamów、Clecio R. Bom、Yumi Choi、Peter S. Ferguson、Mahdieh Navabi、Alfredo Zenteno、DELVE COLLABORATION、Amandine Doliva-Dolinsky、Bur?in Mutlu-Pakdil、Denija Crnojevi?、Dhayaa Anbajagane、Jeffrey L. Carlin、Jonah Medoff、David J. Sand、Erik Tollerud、Sungsoon Lim、Paul Bennet、Alex Drlica-Wagner、Catherine E. Fielder、Jonathan R. Hargis、Kai Herron、Laura Congreve Hunter、Michael G. Jones、Ananthan Karunakaran、Annika H. G. Peter、Aaron J. Romanowsky、Kristine Spekkens、Jay Strader、Beth Willman、Julio A. Carballo-Bello、William Cerny、Astha Chaturvedi、Nitya Kallivayalil、Clara E. Martínez-Vázquez、Gustavo E. Medina、Noelia E. D. No?l、Andrew B. Pace
天文学
Alex H. Riley,Joanna D. Sakowska,Adam Smercina,Kathy Vivas,Monika Adamów,Clecio R. Bom,Yumi Choi,Peter S. Ferguson,Mahdieh Navabi,Alfredo Zenteno,DELVE COLLABORATION,Amandine Doliva-Dolinsky,Bur?in Mutlu-Pakdil,Denija Crnojevi?,Dhayaa Anbajagane,Jeffrey L. Carlin,Jonah Medoff,David J. Sand,Erik Tollerud,Sungsoon Lim,Paul Bennet,Alex Drlica-Wagner,Catherine E. Fielder,Jonathan R. Hargis,Kai Herron,Laura Congreve Hunter,Michael G. Jones,Ananthan Karunakaran,Annika H. G. Peter,Aaron J. Romanowsky,Kristine Spekkens,Jay Strader,Beth Willman,Julio A. Carballo-Bello,William Cerny,Astha Chaturvedi,Nitya Kallivayalil,Clara E. Martínez-Vázquez,Gustavo E. Medina,Noelia E. D. No?l,Andrew B. Pace.The NGC3109 Satellite System: The First Systematic Resolved Search for Dwarf Galaxies Around a SMC-mass Host[EB/OL].(2025-05-08)[2025-06-24].https://arxiv.org/abs/2505.05570.点此复制
评论