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A High-frequency Search for Pulsars within the Central Parsec of Sgr A*

Macquart, J.-P. and Kanekar, N. and Frail, D. A. and Ransom, S. M. (2010) A High-frequency Search for Pulsars within the Central Parsec of Sgr A*. Astrophysical Journal, 715 (2). pp. 939-946. ISSN 0004-637X.

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We report results from a deep high-frequency search for pulsars within the central parsec of Sgr A* using the Green Bank Telescope. The observing frequency of 15 GHz was chosen to maximize the likelihood of detecting normal pulsars (i.e., with periods of ~500 ms and spectral indices of ~–1.7) close to Sgr A* that might be used as probes of gravity in the strong-field regime; this is the highest frequency used for such pulsar searches of the Galactic center (GC) to date. No convincing candidate was detected in the survey, with a 10σ detection threshold of ~10 μJy achieved in two separate observing sessions. This survey represents a significant improvement over previous searches for pulsars at the GC and would have detected a significant fraction (≳5%) of the pulsars around Sgr A*, if they had properties similar to those of the known population. Using our best current knowledge of the properties of the Galactic pulsar population and the scattering material toward Sgr A*, we estimate an upper limit of 90 normal pulsars in orbit within the central parsec of Sgr A*.

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Macquart, J.-P.0000-0001-6763-8234
Additional Information:© 2010 American Astronomical Society. Received 2009 December 8; accepted 2010 April 4; published 2010 May 5. The Green Bank Telescope is operated by the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We thank Carl Bignell for his extraordinary efforts to schedule this project on the GBT. N.K. is grateful for support from the Max-Planck Society and the Alexander von Humboldt Foundation, as well as from a Ramanujan Fellowship. N.K. and J.P.M. also acknowledge support from NRAO Jansky Fellowships. Facilities: GBT
Funding AgencyGrant Number
Max-Planck SocietyUNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Ramanujan FellowshipUNSPECIFIED
National Radio Astronomy ObservatoryUNSPECIFIED
Subject Keywords:Galaxy: center; pulsars: general
Issue or Number:2
Classification Code:PACS: 97.60.Gb; 95.85.Bh; 98.70.Dk; 98.35.Jk; 98.35.Ln
Record Number:CaltechAUTHORS:20100609-140147796
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Official Citation:J.-P. Macquart et al 2010 ApJ 715 939 doi: 10.1088/0004-637X/715/2/939
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18627
Deposited By: Jason Perez
Deposited On:10 Jun 2010 20:18
Last Modified:03 Oct 2019 01:45

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