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Proposal Identification No.:

A2267

Date Received:

2006-Oct-02 15:17:40

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 10 Hours

A search for 6 GHz OH lines at z 0.25

We propose to use the Arecibo 6-band receiver to obtain high resolution spectra of the redshifted OH J=5/2 excited-state transitions, from the z 0.25 source PKS1413+135, to attempt to confirm a tentative detection with the WSRT. The conjugate behaviour of the OH 18cm lines in this source suggests that the satellite J=5/2 lines should also be detectable in absorption and emission. A detection of the J=5/2 lines will allow us to measure any evolution in the fine structure constant and the electron-proton mass ratio µ me /mp from z 0.25 to the present epoch. This would be the first detection of excited state OH at cosmological distances. We request a total time of 10 hours, including overheads and calibration, which would allow us to confirm the WSRT feature at 10 significance.

Name Nissim Kanekar

Institution NRAO, USA

E-mail nkanekar@aoc.nrao.edu

Phone 1 505 835 7334

Student no

Remote Observing Request

X

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

Instrument Setup
C Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations
1


Frequency Ranges Planned
4820 - 4855

2