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Proposal Identification No.:

A2851 Arecibo Observatory

Date Received: 2013-Sep-03 19:38:39 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 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: Regular Astronomy Spectroscopy Extragalactic 51 0 72 minutes less than 100 GB

Towards A New Probe of Dark Matter: HI Masses of Strong Spiral Lenses

The goal of this proposal is to obtain HI masses of the closest sample of strong spiral lenses at an average redshift of 0.1. This is a critical first step, which would ultimately enable us to derive two independent probes of the dark matter distribution for this set of sources ­ from the HI analysis that we have been developing, and from gravitational lensing. The superior sensitivity of Arecibo makes it the ideal instrument to obtain HI masses of this sample. Pilot surveys at comparable redshifts have yielded HI spectra of disk galaxies, which demonstrates the power of Arecibo for carrying out these observations. By determining HI masses of this sample, we will be able to pare it down to the HI-rich sources, which we will follow up with high resolution VLA observations to obtain maps. These observations will also complement large HI surveys and allow us to put this unique sample in the broader framework of HI mass functions. Outreach Abstract: We are attempting to derive two independent constraints on the dark matter distribution for the closest sample of strong spiral lenses. By determining the mass of cold gas in these galaxies, we will determine which of these sources are most optimal for follow-up observations.

Name Sukanya Chakrabarti Carl Heiles

Institution Rochester Institute of Technology UC Berkeley

E-mail chakrabarti@astro.rit.edu heiles@astro.berkeley.edu

Phone 510-967-5766 (510) 642-4510

Student no no

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Additional Authors
Mel Wright (UCB) : melvyn.wright@gmail.com Erwin de Blok (Astron) : blok@astron.nl Bill Cotton (NRAO): Bill Cotton: bcotton@nrao.edu Leo Blitz (UCB): blitz@berkeley.edu Ravi Subramanyan (RRI) : subrahmanyan.ravi@gmail.com Andy Lipnicky (RIT)­ graduate student: awl6964@rit.edu Eric Huff (OSU) : emhuff@gmail.com Adam Bolton (Univ of Utah): bolton@astro.utah.edu Yiping Shu (Univ of Utah)­ graduate student: uuypshu@gmail.com Joel Brownstein (Univ of Utah): joelbrownstein@astro.utah.edu

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

Days Needed at This Interval 3 1 2 3

Interval ­ Interval 6h30min ­ 14hr6min 15hr40min­18hr20min 21hr0min ­22hr15min 3hr0min ­03hr50min

Time Constraints (Must Be Justified in the Prop osal Text) Plus: for 0026-0059: 0hr:0min - 0hr:45 minutes over 3 days

Section I I I - Instruments Needed
L-wide 2


Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1161 - 1335 MHz This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. 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
ID J0822+1828 J0841+3824 J0955+0101 J1021+2028 J1029+0420 J1037+3517 J1111+2234 J1135+3720 J1203+2535 J1251-0208 J1313+0506 J1331+3638 J1703+2451 J2141-0001 J0329-0055 J0026-0059 J0755+1116 RA 125.614474 130.37004 148.83217 155.435084 157.34560 159.43764 167.866760 173.77867 180.98470 192.89877 198.36127 202.91800 255.92278 325.47781 DEC 18.482175 38.40381 1.02901 20.477728 4.33384 35.29194 22.580729 37.33997 25.59697 -2.13477 5.11589 36.46999 24.86111 -0.02008 zd 0.1153 0.116 0.111 0.1208 0.104 0.122 0.2223 0.162 0.101 0.224 0.144 0.113 0.063 0.138 0.10616 0.09236 0.13782 freq 1.27320 1.27240 1.27813 1.26695 1.28623 1.26560 1.16174 1.22203 1.28974 1.16013 1.24126 1.27583 1.33584 1.24780 1.28372 1.29994 1.24800

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