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Proposal Identification No.:

A2850

Date Received:

2013-Sep-03 14:17:24

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Extragalactic 22 Hours 3 hours

The Baryonic Content of Extremely Low Mass Galaxies

We propose continued HI observations of low mass galaxies to better quantify the galaxy mass function. At low masses, the mass function is related to the small-scale matter power spectrum. We focus here on isolated low mass galaxies, which are less affected by environmental processes as compared to similar galaxies in the Local Volume. In 2014A, we observed 61 isolated low mass galaxies with Arecibo with masses between 40-60 km/s, tripling the number of observations in this mass regime. We have determined that even isolated galaxies display significant scatter in their gas mass to stellar mass ratio and the Tully-Fisher relation as compared to more massive galaxies. The proposed observations will better constrain the scatter in the observed scaling relations and allow a more robust estimate of the baryonic and the dynamical masses. We request 32 hours of L-band observing to expand our isolated galaxy sample to lower masses.

Name Jeremy D Bradford

Institution Yale University

E-mail jeremy.bradford@yale.edu

Phone 860-817-2183

Student G

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
1425 - 1445

2