@inproceedings{7497407d53b44e57bf5859db92e411ce,
title = "Chandra observations of black widow pulsars",
abstract = "We describe the first X-ray observations of binary millisecond pulsars PSR J0023+0923, J1810+1744, J2215+5135, and J2256-1024. All are Fermi gamma-ray sources and three are 'black-widow' pulsars, with companions of mass < 0.1 M {\^a}{\v S}{\texttrademark}. Data were taken using the Chandra X-Ray Observatory and covered a full binary orbit for each pulsar. PSRs J2215+5135 and J2256-1024, show significant orbital variability and X-ray flux minima coinciding with eclipses seen at radio wavelengths. This is consistent with intrabinary shock emission characteristic of black-widow pulsars. The other two pulsars, PSRs J0023+0923 and J1810+1744, do not demonstrate significant variability, but are fainter than the other two sources. Spectral fits yield power-law indices that range from 1.4 to 2.3 and blackbody temperatures in the hundreds of eV. The spectrum for PSR J2215+5135 shows a significant hard X-ray component (41% of counts are above 2 keV), which is additional evidence for the presence of intrabinary shock emission.",
keywords = "X-rays: binaries, pulsars: general",
author = "P. Gentile and M. McLaughlin and M. Roberts and F. Camilo and J. Hessels and M. Kerr and S. Ransom and P. Ray and I. Stairs",
note = "Copyright: Copyright 2013 Elsevier B.V., All rights reserved.",
year = "2012",
month = aug,
doi = "10.1017/S1743921312024234",
language = "English (US)",
isbn = "9781107033801",
series = "Proceedings of the International Astronomical Union",
number = "S291",
pages = "389--391",
editor = "{Van Leeuwen}, Joeri",
booktitle = "Neutron Stars and Pulsars",
edition = "S291",
}