A limit on the number of isolated neutron stars detected in the ROSAT Bright Source Catalogue

Roberte E. Rutledge, Derek Brindley Fox, Milan Bogosavljevic, Ashish Mahabal

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The challenge in searching for non-radio-pulsing isolated neutron stars (INSs) is in excluding association with objects in the very large error boxes (∼13″, 1 σ radius) typical of sources from the largest X-ray all-sky survey, the ROSA T All-Sky Survey Bright Source Catalogue (RASS BSC). We search for candidate INSs using statistical analysis of optical (USNO-A2), infrared (IRAS), and radio (NVSS) sources near the ROSAT X-ray localization and show that this selection would find 20% of the INSs in the RASS BSC. This selection finds 32 candidates at declinations δ > -39°, among which are two previously known INSs, 17 sources that we show are not INSs, and 13 the classification of which are as yet undetermined. These results require a limit of less than 67 INSs (90% confidence, full sky, assuming isotropy) in the RASS BSC. This limit modestly constrains a naive and optimistic model for cooling neutron stars in the Galaxy.

Original languageEnglish (US)
Pages (from-to)458-473
Number of pages16
JournalAstrophysical Journal
Volume598
Issue number1 I
DOIs
StatePublished - Nov 20 2003

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neutron stars
catalogs
isotropy
statistical analysis
radio
cooling
declination
Infrared Astronomy Satellite
boxes
sky
confidence
x rays
galaxies
radii

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rutledge, Roberte E. ; Fox, Derek Brindley ; Bogosavljevic, Milan ; Mahabal, Ashish. / A limit on the number of isolated neutron stars detected in the ROSAT Bright Source Catalogue. In: Astrophysical Journal. 2003 ; Vol. 598, No. 1 I. pp. 458-473.
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A limit on the number of isolated neutron stars detected in the ROSAT Bright Source Catalogue. / Rutledge, Roberte E.; Fox, Derek Brindley; Bogosavljevic, Milan; Mahabal, Ashish.

In: Astrophysical Journal, Vol. 598, No. 1 I, 20.11.2003, p. 458-473.

Research output: Contribution to journalArticle

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