GBT24B-384

Expanding the Sample of HI Measurements in Satellites of Milky Way Analogs

Abstract

We propose to characterize the HI content for 67 satellite galaxies in orbit around Milky Way (MW) analog systems selected from the Satellites Around Galactic Analogs (SAGA) Survey. We will investigate whether the HI gas fractions of SAGA satellites differ in comparison to a matched sample of low mass isolated galaxies, in order to test the effect of environment on gas depletion. These data will also help assess whether the gas content of the Milky Way satellites is typical for MW-like systems and constrain host-to-host scatter. Coupled with information from the optical spectra and UV photometry, HI measurements constrain the timescales on which the satellites may deplete their fuel for star formation. Furthermore, measuring the HI emission line profiles for the SAGA satellites will allow us to statistically characterize the frequency of external perturbations like ram pressure stripping for low mass galaxies in MW-like systems, and measure rotational velocities to investigate the possible effect of environment on the baryonic Tully-Fisher relation. We request 60 hours with GBT L-band to observe 67 SAGA satellites which do not have published or archival measurements.

Investigators

Name	Institution
Yasmeen Asali *	Yale University
Marla Geha	Yale University
Yao-Yuan Mao	Utah, University of
John Wu	Rutgers, The State University of New Jersey; Space Telescope Science Institute
Benjamin Weiner	Steward Observatory

* indicates the PI