Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/DolchtagP2676tp.pdf Дата изменения: Thu Oct 13 17:32:19 2011 Дата индексирования: Mon Feb 4 19:37:05 2013 Кодировка:

Proposal Identification No.:

P2676

Date Received:

2011-Oct-03 22:22:02

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Pulsars 20 Hours 60 min

NANOGrav precision timing: ISM irregularities toward pulsar B1937+21

The NANOGrav collaboration is initiating a systematic study of the ISM properties toward the best timing pulsars in our source list. Our mid-term goal is to reduce timing noise in our best Arecibo pulsars down to the 10 ns level. Currently, our best timing pulsar, J1713+0747, has an rms timing residual of 40 ns. The very bright (original) millisecond pulsar, B1937+21, exhibits long-term timing irregularities. But, on timescales of a year or so it has excellent timing characteristics. We seek to use the techniques developed in a previous proposal (P2627, Palliyaguru et al.) to better characterize the ISM timing noise along the line of sight to B1937+21. We will use the cyclic spectroscopy technique developed by several of our team members (Demorest; van Straten) in order to reconstruct the impulse response function of the ISM at three frequencies and correct the arrival time data for ISM effects.

Name Timothy Dolch

Institution Oberlin College

E-mail tdolch@oberlin.edu

Phone 440-775-5207

Student no

Remote Observing Request

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

Instrument Setup
430 G L-wide 327

Atmospheric Observation Instruments:

Sp ecial Equipment or setup: We expect to collect about 10 TB of data in total since this is baseband recording with typically 4 x 10 MHz bands. We will bring external disk drives to the Observatory to transport the data to our home institutions.

RFI Considerations
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Frequency Ranges Planned
307 - 347 MHz 418 - 442 MHz 1150 - 1730 MHz This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..

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