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Proposal Identification No.: A2043 Date Received: 2005­Jan­31 15:38:05
Technical Page
Proposal Type: Short
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 3 Hours
Proposal Title: H I 21 cm Search for a Ly alpha Absorbing Galaxy
ABSTRACT:
We request observing time on the Arecibo Radio Telescope to look for the HI emission spectrum of a nearby
lyman­alpha­dense galaxy discovered recently with the Hubble Space Telescope. The Lyman alpha is detected in
absorption toward the background, optically bright, radio­quiet QSO PG 1216+069. Optically, the absorbing
galaxy will be 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 radio­quiet 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 velocity width.
Name Institution E­mail Phone Student
John Stocke U. Colorado stocke@hyades.colorado.edu (303) 492­8915 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
L­wide
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
1

1408­1415 MHz
2