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Proposal Identification No.:

A2936 Arecibo Observatory

Date Received: 2014-Sep-01 12:54:23 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Extragalactic 30

2 hours less than 100 GB

The HI Properties of Dwarf Galaxies Hosting Massive Black Holes

While black hole (BHs) inhabit the centers of essentially all massive bulge-dominated galaxies, the prevalence of BHs in dwarf galaxies is still unknown. Based on SDSS optical spectroscopy, we recently assembled the largest sample of low mass galaxies hosting central BHs. These galaxies have stellar masses comparable to the Magellanic Clouds and contain some of the least-massive BHs known in galaxy nuclei. BHs power active galactic nuclei (AGN) and AGN feedback is likely responsible for quenching star formation in massive galaxies. We propose to explore the role of AGN feedback on the HI content of low mass galaxies. We request 30 hours of Arecibo L-band 21cm observations to characterize HI emission of 27 low mass systems. Determining the impact of AGN on their low-mass host galaxies will constrain BH feedback and galaxy formation models at all mass scales. Outreach Abstract: Supermassive black holes are thought reside at the centers of all large galaxies. As matter falls onto a supermassive black hole, we observe powerful radiation. This radiation can affect the properties and gas content of the host galaxy. Until recently it was unknown whether black holes reside at the centers of lower mass galaxies at masses less than 1/10th that of our Galaxy. We have recently assembled the largest sample of such low mass galaxies with evidence for a central black hole. Using Arecibo, we will measure the gas content of these low mass galaxies and study the effects that supermassive black holes have on their host galaxy.

Name Marla Geha Jeremy Bradford

Institution Yale University Yale University

E-mail marla.geha@yale.edu jeremy.bradford@yale.edu

Phone 203-432-5796

Student no G

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Additional Authors
Amy Reines (University of Michigan) Jenny Greene (Princeton University)

This work is part of a PhD thesis.

Remote Observing Request

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

Section I I - Time Request
The following times are in LST. For these observations night-time is required.

Begin ­ End Interval­Interval 7:00 ­ 17:00 ­ ­ ­

Days Needed at This Interval 3

Time Constraints (Must Be Justified in the Prop osal Text)

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
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Section V - Observing List Target List
Target List is include in the proposal.

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