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Proposal Identification No.:

A2812 Arecibo Observatory

Date Received: 2015-Mar-02 16:41:42 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2015. This proposal has been submitted before. The previous proposal number is a2812. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next 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: Large Astronomy Spectroscopy Extragalactic 80 40 338 0.75 100-500 GB

A Volume-Limited, Complete View of HI in the z=0 Galaxy Population

To build the first truly complete view of the z=0 galaxy population in full environmental context, we propose 21cm observations of the last 68 galaxies needed to complete an unbiased HI census for the RESOLVE survey. The requested data will statistically sample environments ranging from massive clusters to low-density regimes including large-scale filaments and walls. RESOLVE is unique among local surveys in tracing dwarf to giant galaxies across well characterized, representative environments. HI data are essential to key RESOLVE science goals: measuring gas fractions, the baryonic mass function, and the baryonic mass-velocity relation, all vs. galaxy properties and environment. These fundamental measurements depend on robust and complete HI data for subpopulations that require Arecibo's sensitivity and/or resolution: gas-poor, low-mass, and/or paired galaxies. The resulting HI census will have fantastic legacy value and follow-up potential. Outreach Abstract: As the fuel for star formation, hydrogen gas reservoirs have a critical impact on the evolution of galaxies, and these reservoirs depend on cosmic environment. Just like the human population census reveals birth, death, and demographic information for government planning, a complete census of the galaxy population across a range of environments may teach us how gas is used and replenished and even where undetected gas may be hidden. To this end, we are performing a census of neutral hydrogen gas for the RESOLVE Survey, which consists of all 1550 galaxies in a huge volume of the relatively nearby universe. Unlike most astronomical surveys, this "volume-limited" census is not biased toward bigger/brighter galaxies but fairly counts smaller/fainter galaxies in which gas properties vary more dramatically. Our survey will reveal the galaxy gas inventory, constraining gas consumption, replenishment, and hidden gas stores as a function of environment.

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Name Sheila J Kannappan Adam K Leroy

Institution University of North Carolina, Chapel Hill Ohio State University

E-mail sheila@physics.unc.edu aleroy@nrao.edu

Phone 919-962-3486

Student no no

Additional Authors
David Stark (grad) dstark@physics.unc.edu Kathleen Eckert (grad) keckert@physics.unc.edu Linda Watson lwatson@cfa.harvard.edu Erik Hoversten ehoverst@live.unc.edu Ian Dell-Antonio ian@het.brown.edu Andreas Berlind a.berlind@vanderbilt.edu Jonathan Florez (grad) jflorez0206@gmail.com

This work is part of a PhD thesis.

Remote Observing Request

Observer will travel to AO Remote Observing X 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 Interval Interval 23:00:0000:15:00 01:00:0003:15:00

Days Needed at This Interval 4 34

Time Constraints (Must Be Justified in the Prop osal Text) Due to the low declination of our targets, these LST ranges must be followed closely. We have designed and tested codes that quickly generate command-line scripts for a given run and can be started by the operator. These have been used successfully in the past several semesters. 2

Next Semester Time Request

Begin End Interval Interval 09:00:0012:00:00 12:00:0014:30:00

Days Needed at This Interval 4 11

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
1385-1401

Section V - Observing List Target List
See scientific justification

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