Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/KanekartagA2940tp.pdf Дата изменения: Thu Sep 11 21:11:45 2014 Дата индексирования: Mon Apr 11 16:48:14 2016 Кодировка: Поисковые слова: universe

Proposal Identification No.:

A2940

Date Received:

2014-Sep-01 14:26:23

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 50 Hours 45m

The gas mass of eleven damped Lyman-alpha systems at z<0.2

Despite 25 years of studies of damped Lyman-alpha absorbers (DLAs), the precursors of today's normal galaxies, the physical properties of the absorbers remain unknown. Low-redshift DLAs allow the exciting possibility of measuring the gas mass, size, and dynamical mass through HI-21cm emission studies, as well as their relations to the SFR, metallicity, etc. So far, this has only been possible for a single DLA, due to the lack of known low-z DLAs. We have searched the HST-COS archive to identify eleven DLAs at z<0.2, and propose here to use the Arecibo L-wide receiver to measure their gas masses via a search for redshifted HI-21cm emission. The observations have been planned so that even non-detections of HI emission will yield tight constraints on the HI mass, ruling out the possibility that the host galaxies are large spiral disks. We request 50 hours of time for this pro ject.

Name Nissim Kanekar

Institution National Centre for Radio Astrophysics

E-mail nkanekar@ncra.tifr.res.in

Phone 912025719246

Student no

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned
1180-1413

This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

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