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Proposal Identification No.:

A2043

Date Received:

2005-Jan-31 15:38:05

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Short Astronomy Spectroscopy Extragalactic 3 Hours

H I 21 cm Search for a Ly alpha Absorbing Galaxy

We request observing time on the Arecib o Radio Telescop e to lo ok for the HI emission sp ectrum of a nearby lyman-alpha-dense galaxy discovered recently with the Hubble Space Telescop e. The Lyman alpha is detected in absorption toward the background, optically bright, radio-quiet QSO PG 1216+069. Optically, the absorbing galaxy will b e very hard to detect, due to the brightness of the background QSO. However, detecting HI in emission from this foreground galaxy is very likely, considering the high column densities measured by the HST observations, and the radio-quiet nature of the background quasar, which has a less than 2 mJy continuum flux density at 1.4 GHz. The detection of HI will provide us with a gas mass and dynamical mass from the measured velo city width.

Name John Stocke

Institution U. Colorado

E-mail stocke@hyades.colorado.edu

Phone (303) 492-8915

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1


1408-1415 MHz

2