GBT26A-574

HI Mass Limits of Satellites of Low-Mass Galaxies

Abstract

We request 38.5 hours of filler to use the GBT to search for the HI reservoirs of 25 Local Volume dwarf satellite candidates discovered around nearby low-mass hosts. The proposed observations will allows to place strict HI limits on known satellites of low-mass galaxies confirming whether or not they are quenched. Additionally,the proposed observations will allow us to measure distances to individual candidates (using the redshift of the 21 cm HI emission line) and combined with SBF distance, understand the kinematics of the host and satellite system. Dwarf galaxies are regarded as cosmological and astrophysical probes on small-scales, thus their discovery and characterization are among the most important goals in the field. Though much effort has been made in surveying Milky Way-mass galaxies and their satellite populations, the sample of satellites around lower-mass hosts is much less comprehensive. This proposal is part of a larger campaign to establish a statistical sample of dwarf satellite populations with secure distances around Large Magellanic Cloud and Small Magellanic Cloud mass hosts. The HI-deficiency fraction of the full sample will provide quantitative constraints for galaxy formation physics and serve as an important benchmark for simulations to try and recover.

Investigators

Name	Institution
GBT Operator	Green Bank Observatory
Laura Hunter *	Indiana University; Dartmouth College
Burcin Mutlu-Pakdil	Dartmouth College
Michael Jones	California Institute of Technology
David Sand	Arizona, University of; Texas Tech University
Kristine Spekkens	Queen's University
Paul Bennet	Space Telescope Science Institute
Denija Crnojevic	Texas Tech University; Tampa, University of
Amandine Doliva-Dolinsky	Dartmouth College
Kai Herron	Dartmouth College

* indicates the PI