Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/KanekartagA2525tp.pdf Дата изменения: Tue Oct 6 21:25:12 2009 Дата индексирования: Sat Jun 26 00:08:20 2010 Кодировка:

Proposal Identification No.:

A2525

Date Received:

2009-Sep-30 01:15:50

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 160 Hours 1 hour

Do the fundamental constants change with time ?

We propose to use the Arecibo L-band receiver to obtain deep, high resolution spectra in the redshifted 18cm satellite OH lines from the z = 0.247 source, PKS1413+135. The conjugate nature of the lines implies that these high-precision redshift measurements can be used to probe changes in the fine structure constant , the proton-electron mass ratio µ and the proton gyromagnetic ratio gp between z=0.247 and today. The sensitivity of the proposed observations to changes in and gp will be the highest from any astronomical technique and with the fewest systematics. The observations will directly confirm or deny the presence of a velocity offset between the satellite OH lines, tentatively detected (at 2.6 significance) in earlier Arecibo and WSRT spectra. If confirmed, this would be evidence for changes in , µ or gp , providing an avenue to probe new and fundamental physics. Our total time request is 160 hours, including all calibration.

Name Nissim Kanekar

Institution National Radio Astronomy Observatory

E-mail nkanekar@nrao.edu

Phone 1-575-8357334

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
1138-1382 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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