Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/KasiantagP2394tp.pdf Дата изменения: Wed Feb 13 03:42:28 2008 Дата индексирования: Wed Jan 14 13:26:16 2009 Кодировка: Поисковые слова: п п п п п п п п

Proposal Identification No.:

P2394

Date Received:

2008-Feb-01 20:50:11

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Pulsars 30 Hours 1 hour 15 minutes

Continued Timing of the Young Relativistic Binary PSR J1906+0746

~ We propose monthly 2.5-hour timing observations of PSRJ1906+0746, the relativistic binary pulsar indentified in the PALFA survey data. This young pulsar is in an eccentric 4-hour orbit. Our timing observations over the past few years have allowed us to measure the time dilation and gravitational redshift as well as the shift of periastron passage, resulting in mass estimates for the pulsar and its companion, which indicate that the companion is a second neutron star. We currently have a marginal detection of the orbital period decay and expect it to improve greatly with another year or so of data. This measurement will overconstrain the system and provide a test of strong-field gravity. The pulsar also shows strong profile evolution with time, which we are using to investigate the pulsar's 2-dimensional beam shape and the phenomenon of geodetic precession. The high level of timing noise and quickly-evolving profile make it even more essential that we obtain regular observations with Arecibo: frequent observations are required for the best possible timing, and high-quality profiles at each epoch are needed in order to effectively map the pulsar's beam. Finally, we will continue to search for radio pulsations for the companion star in all of the data acquired.

Name Laura E Kasian

Institution University of British Columbia

E-mail kasian@phas.ubc.ca

Phone 778-866-0222

Student G

Remote Observing Request

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

Instrument Setup
L-wide Atmospheric Observation Instruments:

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Description of Observer Equipment: ASP Sp ecial Equipment or setup: none

RFI Considerations Frequency Ranges Planned
1390-1440 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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