GBT18A-246
Project AMIGA: The Circumgalactic Medium of M31 -- The Neutral Component II
Abstract
Project AMIGA is an approved large HST survey of the circumgalactic medium (CGM) of M31, measuring UV absorption lines toward background AGN. We have been following up with 21cm HI measurements using the GBT, and would like to continue this by mapping 1x1 degree regions around a group of 11 AGN projected behind the CGM of M31. Previous 21cm measurements with the GBT toward 48 AGN behind the CGM of M31 showed no 21cm emission to levels (5-sigma) of 2-4x10^17 cm^{-2} a result that is in some tension with expectations from UV surveys through the CGM of other galaxies. If the proposed observations also do not reveal any HI it would imply that the CGM of M31 is not typical of large spiral galaxies in UV selected samples.
Investigators
| Name | Institution |
|---|---|
| Jay Lockman * | Green Bank Observatory |
| Lucas Denny | Florida State University |
| Christopher Wotta | University of Notre Dame |
| Nicolas Lehner | University of Notre Dame |
| Laura Early | Juniata College |
| Michelle Berg | Texas at Austin, University of; University of Notre Dame |
| J. Christopher Howk | University of Notre Dame |
* indicates the PI