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Proposal Identification No.:

A2754 Arecibo Observatory

Date Received: 2013-Sep-02 15:38:39 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2013. This proposal has been submitted before. The previous proposal number is A2754, A2611. 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 290 394.75 553 650 1 hour less than 100 GB

Surveying the Zone of Avoidance with ALFA

Obscuration due to dust and the high stellar density at low Galactic latitudes creates a "Zone of Avoidance" (ZOA) in the distribution of external galaxies, in optical/IR surveys. This creates uncertainties in our understanding of the dynamics of the local Universe, cosmic flow fields, and the convergence of the CMB dipole. The 21cm line of HI passes unimpeded through the ZOA. We propose to continue our deep survey of the ZOA with ALFA, as commensal pro ject with PALFA in the inner Galaxy, and as primary pro ject in the outer Galaxy. Galaxies discovered so far trace large-scale structure across the Galactic plane, and reveal both predicted and unpredicted mass overdensities. These data are sensitive and deep enough to address not only local contributions to flow fields, but contributions from structures 100 - 200 Mpc and beyond, and will uniquely contribute to flow field studies. Outreach Abstract: Galaxies are hard to see behind our own Milky Way. There is a "Zone of Avoidance" for optical astronomy there, but radio waves from neutral hydrogen gas in optically-obscured galaxies are easily detected by the Arecibo radio telescope. We are discovering these hidden galaxies using Arecibo, and finishing the map of galaxies in our cosmic neighborhood.

Name Patricia A Henning Travis P McIntyre

Institution University of Mexico University of Mexico

New New

E-mail henning@phys.unm.edu travispmcintyre@gmail.com

Phone 505-277-3166 505-277-1516

Student no G

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Additional Authors
G. Vaive (UNM grad student) gvaive@unm.edu R.F. Minchin (NAIC) rminchin@naic.edu E. Momjian (NRAO) emomjian@nrao.edu J.L. Rosenberg (GMU) jrosenb4@gmu.edu S. Schneider (UMass) Schneider@astro.umass.edu Z. Butcher (UMass grad student) zbutcher@astro.umass.edu L. Staveley-Smith (UWA) lister.staveley-smith@icrar.org E.Viaz (UWA grad student) en.vaez@yahoo.com W. van Driel (Paris Obs) wim.vandriel@obspm.fr C. Springob (UWA) Christopher.springob@icrar.org B. Catinella (Swinburne) bcatinella@swin.edu.au B. Koribalski (CSIRO) Baerbel.Koribalski@csiro.au M. Putman (Columbia) mputman@astro.columbia.edu

This work is part of both a PhD and a MS 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 Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) For these observations, nighttime is required. The LST ranges for spring 2014 are: 04:00 04:15 04:30 04:45 07:45 07:45 07:45 07:45 48 nights 180 h 4 nights 14 h 3 nights 9.75 h 4 nights 12 h 2


05:00 05:15 05:30 05:45 06:00 06:15 06:30 06:45

-

07:45 07:45 07:45 07:45 07:45 07:45 07:45 07:45

3 4 3 4 4 3 4 3

nights nights nights nights nights nights nights nights

8.25 h 10 h 6.75 h 8h 7h 4.5 h 5h 3h

This gives total time of 268.75 h in 87 nights. We add 15 m to each session for schedule quantization giving a total request of 290 h for spring 2014.

Next Semester Time Request

Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text) For these observations, nighttime is required. The LST ranges for fall 2014 are: 04:00 04:00 04:00 04:00 04:00 04:00 04:00 04:00 04:00 04:00 04:00 04:00 07:45 07:30 07:15 07:00 06:45 06:30 06:15 06:00 05:45 05:30 05:15 05:00 74 nights 277.5 h 3 nights 10.5 h 4 nights 13 h 3 nights 9 h 4 nights 11 h 4 nights 10 h 3 nights 6.75 h 4 nights 8 h 4 nights 7 h 3 nights 4.5 h 4 nights 5 h 4 nights 4 h

This gives total time of 366.25 h in 114 nights. We add 15 m to each session for schedule quantization giving a total request of 394.75 h for fall 2014.

Section I I I - Instruments Needed
ALFA 3


Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1225 - 1525 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
Outer Galaxy: 175
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