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Дата изменения: Thu Mar 6 22:59:08 2014
Дата индексирования: Mon Apr 11 16:43:26 2016
Кодировка:
Поисковые слова: южная атлантическая аномалия

Proposal Identification No.:

A2899 Arecibo Observatory

Date Received: 2014-Mar-02 18:10:23 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2014. 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 40 42.5 2 less than 100 GB

Harvesting ALFALFA: Discovering Galaxies in the Pisces-Perseus Void

One of the most prominent local underdensities is the void separating the Local Supercluster from the Pisces-Perseus Supercluster (PPS). This L-band wide (LBW) observing program will increase the sample of galaxies in and around the PPS void by targeting 280 low signal-to-noise ratio ALFALFA sources coincident with optical counterparts of unknown redshift. Observations made under Arecibo observing program A2811 by members of the Undergraduate ALFALFA Team in November 2013 show that such sources are real 75% of the time. Thus the proposed observations of additional targets extracted from newly available regions of the ALFALFA catalog will identify more galaxies in and near the PPS void (a region lacking SDSS spectroscopic coverage), allowing us both to delineate the void better, and to compare the intrinsic properties of such galaxies relative to the overall local universe population on more solid statistical ground. 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.

Name Rebecca A Koopmann Michael G Jones

Institution Union College Cornell University

E-mail koopmanr@union.edu mgj37@cornell.edu

Phone 518-388-6786 607-255-6472

Student no G

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Additional Authors
Martha Haynes (Cornell U.) haynes@astro.cornell.edu Riccardo Giovanelli (Cornell U.) riccardo@astro.cornell.edu * Gregory Hallenbeck (Cornell PhD student) ghallenbeck@astro.cornell.edu * Lukas Leisman (Cornell PhD student) leisman@astro.cornell.edu Thomas Balonek (Colgate U.) tbalonek@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 Adriana Durbala (U. Wisconsin-Stevens Point) Adriana.Durbala@uwsp.edu Rose Finn (Siena Coll.) rfinn@siena.edu * Graduate Student Due to the character limit on the on-line coversheet form, find the complete list at http://egg.astro.cornell.edu/alfalfa/ docs/prop.mar14.authorlist.html

This work is part of a PhD 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

Days Needed at This Interval 8

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 at least 6 nights during the "Thanksgiving break" period: Nov 23-30, 2014. If scheduling allows, we request that 2 nights be allocated between Oct 1 - Nov 5 so that Dr. Koopmann's Freshman Physics Seminar may conduct remote observing as part of their classwork. 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
1375-1430 MHz

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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