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Proposal Identification No.:

P2994 Arecibo Observatory

Date Received: 2015-Mar-02 05:35:23 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2015. This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Short Pulsars Galactic 1 hr 20 min 0 1 hr 20 min 100-500 GB Service Observing Request

Is soft X-ray transient 1H 1905+000 a radio millisecond pulsar now?

There are now three sources known that change from mass-accreting X-ray emitters to pulsating radio emitters, and back. Given this, we propose for the follow-up observation of the neutron star binary 1H 1905+000. That source has transformed from an X-ray emitting accretion state to a low, very quiescent state - the dimmest of all X-ray pulsars. Our 2006 Arecibo observations, however, did not yet reveal radio pulsations. Has the source changed to a proper radio-emitting millisecond pulsar since?That we propose to investigate in this proposal. Outreach Abstract: Why do some sources undergo transitions from accretion-powered to rotation-powered state and vice versa?We hereby propose to get closer to the answer on this question through an investigation of neutron star binary 1H 1905+000. This source is known to turn "on" and "off" its X-ray emission. It may be the closest counterpart to the millisecond radio pulsars (MSPs). We already know three MSPs that undergo transitions between "X-ray" and "radio" personalities. Based on multi-wavelength tracking of these sources, we now have a feeling of how frequently they change their states. Through a study of 1H 1905+000 we hope to find out what actually influences such transitions.

Name Klim V Mikhailov

Joeri van Leeuwen

Institution Anton Pannekoek Institute for Astronomy ASTRON

E-mail mixklim@gmail.com

Phone +31626544074

Student G

leeuwen@astron.nl

+31626154552

no

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Additional Authors
Peter Jonker SRON P.Jonker@sron.nl

This work is part of a PhD thesis.

Remote Observing Request

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

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin ­ End Interval ­ Interval 18:39:54­19:38:32 ­ ­ ­

Days Needed at This Interval 1

Time Constraints (Must Be Justified in the Prop osal Text) No additional constraints

Section I I I - Instruments Needed
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations
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Frequency Ranges Planned
1220 - 1250 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.

Section V - Observing List Target List
1H1905+000 19:08:27.0 0:00:07.7 18:39:54-19:38:32

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