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Proposal Identification No.:

A2810 Arecibo Observatory

Date Received: 2013-Mar-01 17:21:20 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2013. This proposal has not been submitted before. Proposal Type: General Category: Sub-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 Spectroscopy Extragalactic 12

1 hour less than 100 GB

Gas Consumption in Post-Merger Galaxies

Galaxy-galaxy interactions are a crucial part of galaxy evolution, with studies of these interactions showing changes in star formation rates, metallicity, AGN contribution, colours, morphologies, neutral gas content and IR emission. However, what happens post-coalescence has yet to be measured as part of a statistical study. We have therefore recently embarked on a study of the properties of post-mergers, using SDSS data to show that the SFR peaks in this final coalescence stage. What is currently unknown, however, is how much gas is left in the galaxy once the interaction is complete; is the ma jority of the gas reservoir depleted (either through consumption or stripping), or is there sufficient HI left for star formation to continue post-merger?We will tackle this question by combining our existing measurements of gas depletion in pairs of galaxies (that trace the early part of the interaction) with proposed L-wide observations of 55 post-mergers. Outreach Abstract: Galaxy-galaxy interactions are a crucial part of galaxy evolution, with studies of these interactions showing changes in star formation rates, metallicity, AGN contribution, colours, morphologies, neutral gas content and IR emission. Studies have shown star formation rates increase as the two galaxies approach each other, with the enhancements peaking during the final coalescence stage. We have recently observed the depletion of gas in these interactions leading up to this final stage, however what happens to this gas reservoir in the end is unknown. We will investigate this by adding the proposed L-wide observations of 55 post-mergers to our current sample of interacting pairs. Studies such as these are vital to our understanding of galaxy evolution, including the formation of massive galaxies and understanding of their star formation histories.

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Name Derek J Fertig Sara L Ellison

Institution George Mason University University of Victoria

E-mail dfertig@masonlive.gmu.edu sarae@uvic.ca

Phone 410-340-6177 250-721-7737

Student G no

Additional Authors
Jessica Rosenberg, jrosenb4@gmu.edu David Patton, dpatton@trentu.ca Jillian Scudder (grad student), jscudder@uvic.ca

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 23:45 ­ 00:45 07:00 ­ 10:30 10:00 ­ 12:00 11:30 ­ 12:30

Days Needed at This Interval 1 1 1 1

Time Constraints (Must Be Justified in the Prop osal Text) 13:45 Begin 17:00 End 1 Day 21:30 Begin 22:45 End 1 Day These times allow all observations to be completed within the semester, at night, while maximizing the number of days available for scheduling. 2

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

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1230-1470 This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

Section V - Observing List Target List

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