Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2013Spring/ArzoumaniantagP2777.pdf Дата изменения: Tue Sep 11 04:14:21 2012 Дата индексирования: Tue Feb 5 01:41:56 2013 Кодировка:

Proposal Identification No.:

P2777 Arecibo Observatory

Date Received: 2012-Sep-04 17:20:55 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Sep 1 2012. This proposal has not been submitted before. Proposal Type: General Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Regular Pulsars Galactic 8 N/A N/A N/A 1 hr min, 1.5 hr preferred for G63.7 100-500 GB

Prop osal Title: Pulsation Searches Toward the X-ray-Selected Candidate Pulsars in the Supernova Remnants CTB 87 and G63.7+1.1 ABSTRACT: We propose a targeted search for radio pulsations from two candidate young pulsars identified in X-ray observations of the filled-center supernova remnants (SNRs) CTB 87 and G63.7+1.1. Images of the SNR fields with the Chandra X-ray telescope have revealed unresolved sources with properties suggestive of rotation-powered pulsars with active magnetospheres that are powering these nebulae. The candidate pulsar in CTB 87 lies within faint extended X-ray emission features reminiscent of the torus and jet structures seen around the Crab, Vela, and other young pulsars. To better constrain the ages, magnetic field strengths, energetics, and other properties essential to understanding the multiwavelength emissions of both the neutron star and SNR, we aim to detect radio pulsations from the central engines of these two remnants. Arecibo and the new PUPPI backend offer near-optimum capability to carry out these searches. Outreach Abstract: Pulsars are "cosmic lighthouses" that sweep beams of light and other radiation across our skies. They also have an effect on their local environments, sculpting the gas and dust in the space between stars ­ the "interstellar medium." This interaction is especially dramatic when the local environment is the debris left over by the supernova explosion in which the pulsar was born. We are searching for pulsed signals from ob jects (which we believe to be pulsars) seen in X-ray images of two distant supernova remnants. If we find the expected pulsations with Arecibo's uniquely sensitive telescope, we will learn how long ago the supernova explosions occurred, what role magnetism plays in the later evolution of the remnants of these explosions, and how much energy is being radiated by these energetic pulsars into their surroundings.

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Name Zaven Arzoumanian Samar Safi-Harb

Institution E-mail NASA zaven.arzoumanian@nasa.gov GSFC/CRESST/USRA University of Mani- Samar.Safi-Harb@ad.umanitoba.ca toba

Phone 301-286-2547 204-474-7104

Student no no

Additional Authors
Heather Matheson (U. of Manitoba; PhD student): matheson@physics.umanitoba.ca Roland Kothes (DRAO): Roland.Kothes@nrc-cnrc.gc.ca

This work is part of a PhD thesis.

Remote Observing Request

X

Observer will travel to AO 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 Interval­Interval 19:45 ­ 20:45 18:30 ­ 21:00 ­ ­

Days Needed at This Interval 3 2

Time Constraints (Must Be Justified in the Prop osal Text) CTB 87 (transit at 20:16:40 LST) is the higher-priority target. The 3 days can be scheduled as much as several weeks apart, but a closer grouping allows us to travel to AO for observing. Similarly, the two days for G63.7+1.1 (transit at 19:46:26) need not be scheduled together, but it is more convenient if they are.

Next Semester Time Request
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Begin ­ End Interval­Interval ­ ­ ­ ­

Days Needed at This Interval

Time Constraints (Must Be Justified in the Prop osal Text)

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

Sp ecial Equipment or setup: We intend to use PUPPI in search mode.

Section IV - RFI Considerations Frequency Ranges Planned
1200 - 1800 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
SourceName RA(hh:mm:ss.s) Dec(dd:mm:ss.s) RiseTime TransitTime SetTime CTB87 20:16:09.2 37:11:10.5 19:51:08 20:16:40 20:42:11 G63.7+1.1 19:45:53.0 27:43:51.6 18:31:04 19:46:26 21:01:48

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