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Proposal Identication No.: A1700 Date Received: 2002-May-20 13:13:11
Technical Page
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Extragalactic
Total Time Requested: 25.0 Hours
Proposal Title: A search for H2CO in the Cloverleaf quasar at z=2.56
ABSTRACT:
The Cloverleaf quasar (H1413+117, z=2.56), the most intense high-redshifted object to be detected in CO, revealed
that galaxies at early epochs could have large amounts of molecular gas, possibly excited by an important starburst.
Other similar objects also demonstrated the importance of studying the physical conditions of the formation of
galaxies and of the rst generations of stars. The search of molecular lines in high-z objects is still a challenge for
present day instrumentation, but the upgraded Arecibo telescope has the potential to detect the H2CO[1(10)-1(11)]
(6cm, 4.83 GHz) line in the sensitive L-band. If the formaldehyde emission is indeed caused by low-gain amplied
emission due to inverted molecular gas in front of the strong nuclear radio continuum source then the formaldehyde
ampliers would be a powerful diagnostic of the molecular gas inside the active nuclei of these distant objects.
Name Institution E-mail Phone Student
Luca Olmi University of Puerto
Rico
olmi@naic.edu 787-764-0000,
ext 1-7346
no
Service Observing Request Remot e Observing Request
None No
All of the observing run. X Maybe
X Part of the observing run. Yes
Queue Observing
Instrument Setup
L-narrow
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
1333 - 1383
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
2