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Proposal Identification No.:

P2204

Date Received:

2006-Feb-01 23:45:13

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Prop osal Title: Regular Pulsars 3.5 Hours

Soft X-ray transient 1H 1905+000: the closest counterpart to the millisecond

radio pulsars.
ABSTRACT:
Why do transient X-ray pulsars not 'turn-on' their radio emission in their quiescent period, when the accretion has halted?After all, they already have the same typical magnetic field strength and period as millisecond radio pulsars (MSPs) and we know they transform into MSPs later. Possibly their thermal emission initially continues to quench the cascade thought to produce robust radio emission. With Chandra we have recently found 1H~ 1905+000 to be the dimmest, coldest transient X-ray pulsar known, making it the closest counterpart to the MSPs. We therefore propose to search 1H~ 1905+000 for radio pulsations to learn about this interaction between accretion, thermal radiation and the radio-pulsar emission mechanism.

Name Joeri van Leeuwen

Institution University of British Columbia

E-mail joeri@astro.ubc.ca

Phone (604) 822 3657

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing X

No Maybe Yes

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations

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Frequency Ranges Planned
1120-1520 This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. 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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