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Proposal Identification No.:

A2754 Arecibo Observatory

Date Received: 2014-Aug-29 12:59:09 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2014. 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 292 393.25 698.75 504 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 also 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 352-359-8978

Student no G

1

Additional Authors
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. Koribalski (CSIRO) Baerbel.Koribalski@csiro.au

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

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 2015 are: 04:00 04:15 04:30 04:45 05:00 07:45 07:45 07:45 07:45 07:45 48 nights 180 4 nights 14 h 3 nights 9.75 4 nights 12 h 3 nights 8.25 h (to 17 Feb) (to 21 Feb) h (to 24 Feb) (to 28 Feb) h (to 3 Mar) 2

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

4 3 4 4 3 4 3

nights nights nights nights nights nights nights

10 h (to 7 Mar) 6.75 h (to 11 Mar) 8 h (to 14 Mar) 7 h (to 19 Mar) 4.5 h (to 21 Mar) 5 h (to 25 Mar) 3 h (to 27 Mar)

This gives a total time of 269.75 h in 89 nights. We add 15 m to each session for schedule quantization giving a total request of 292 h for spring 2015.

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 2015 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 (from 19 Oct) 3 nights 10.5 h (from 16 Oct) 4 nights 13 h (from 12 Oct) 3 nights 9 h (from 9 Oct) 4 nights 11 h (from 5 Oct) 4 nights 10 h (from 1 Oct) 3 nights 6.75 h (from 28 Sep) 4 nights 8 h (from 24 Sep) 4 nights 7 h (from 21 Sep) 3 nights 4.5 h (from 17 Sep) 4 nights 5 h (from 13 Sep) 4 nights 4 h (from 10 Sep)

This gives a total time of 365 h in 113 nights. We add 15 m to each session for schedule quantization giving a total time request of 393.25 h for fall 2015.

Section I I I - Instruments Needed
ALFA Atmospheric Observation Instruments: 3

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
4