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Proposal Identification No.:

A2811 Arecibo Observatory

Date Received: 2013-Feb-27 12:09:13 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: One of the most prominent local underdensities is the void separating the Local Supercluster from the Pisces-Perseus Supercluster. This region serves as an excellent laboratory to test the "Void Phenomenon", the apparent discrepancy between the number of observed galaxies in voids and the number of low mass dark matter halos predicted by simulations to reside in them. In order to increase the redshift sampling of galaxies in this region, we propose to observe 280 candidate ALFALFA HI detections with signal-to-noise ratios 5 70%. Increasing the number of known redshifts will allow us to characterize the structure and density contrast of the void and to identify or set further limits on the population of galaxies within it. Outreach Abstract: The galaxy distribution in the local universe shows a filamentary pattern with high density regions containing lots of galaxies separated from other high density regions by nearly empty ones, the voids. Numerical simulations of the distribution of dark matter halos in the local universe indicate that voids should not be completely empty, but observations seem to find fewer galaxies than predicted by the simulations. As a followup program to the ALFALFA extragalactic survey, we propose to conduct further Arecibo observations specifically to look for low mass gas-bearing galaxies in one of the most prominent voids in the local universe. Regular Astronomy Spectroscopy Extragalactic 42 0 2 hours less than 100 GB

Harvesting ALFALFA: Reaping the 21cm Harvest in the Pisces-Perseus Supercluster and the Foreground Void

Name Martha P Haynes Riccardo Giovanelli

Institution Cornell University Cornell University

E-mail haynes@astro.cornell.edu riccardo@astro.cornell.edu

Phone 607/255-0610 607/255-6505

Student no no

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Additional Authors
Rebecca Koopmann (Union College) koopmanr@union.edu Parker Troischt (Hartwick College) TroischtP@hartwick.edu Li Xiao (NAOC) xl@bao.ac.cn Gregory Hallenbeck (Cornell PhD student) ghallenbeck@astro.cornell.edu Michael Jones (Cornell PhD student) jonesmg@astro.cornell.edu Lukas Leisman (Cornell PhD student) leisman@astro.cornell.edu David Stark (U. North Carolina PhD student) dstark@physics.unc.edu Thomas Balonek (Colgate U.) tbalonek@mail.colgate.edu John Cannon (Macalester Coll.) jcannon@macalester.edu Kim Coble (Chicago State U.) kcoble@csu.edu Mary Crone Odekon (Skidmore) mcrone@skidmore.edu David Craig (West Texas A and M U) dcraig@mail.wtamu.edu Due to the character limit on the on-line coversheet form, find the complete list at http://egg.astro.cornell.edu/alfalfa /docs/prop.mar13.authorlist.html

This work is not part of a thesis.

Remote Observing Request

X

Observer will travel to AO 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 21.5 ­ ­ ­ ­ 3.5

Days Needed at This Interval 7

Time Constraints (Must Be Justified in the Prop osal Text) So that members of the Undergraduate ALFALFA team are able to travel to Arecibo to conduct the observations, we request time during the "Thanksgiving break" period: Nov 23-30, 2013

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

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1375-1430 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
280 ALFALFA sources with 22
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