GBT23A-084

Cold gas reservoirs of satellites in nearby Milky Way-like systems

Abstract

The vast majority of satellites in the Local Group are quenched and devoid of neutral gas, a situation that is reproduced by many simulations of satellite quenching. Yet recent observations have painted a conflicting picture of the quenched fraction in other Milky Way-like systems in the nearby Universe. In this proposal we target the neutral gas content of 57 satellites around 15 nearby, Milky Way-like galaxies, in order to robustly quantify the quenched, gas-poor fraction in these systems. These observations will complete a census of 246 satellites in 22 nearby systems. The targets of this proposal focus on low-mass satellites (log Mstar/Msol < 8) where the disagreement between different observational samples (and current simulations) is most severe, but also where those samples are least complete and lacking tight constraints of gas content and star formation activity. We also have an ongoing H-alpha imaging program of the same target sample which will complement these observations; together they will provide measurements of both the star formation and the gas reservoir that supports it. We request a total of 74 hours to search for HI line emission along the line-of-sight of each of these 57 satellites.

Investigators

Name	Institution
Michael Jones *	California Institute of Technology
Ananthan Karunakaran	Toronto, University of
David Sand	Arizona, University of; Texas Tech University
Paul Bennet	Space Telescope Science Institute
Burcin Mutlu-Pakdil	Dartmouth College
Denija Crnojevic	Texas Tech University; Tampa, University of
Kristine Spekkens	Queen's University
Catherine Fielder	Arizona, University of; Pittsburgh, University of

* indicates the PI