• DOI:10.1086/522667
• Corpus ID: 7915388

Discovery of an Isolated Compact Object at High Galactic Latitude

@article{Rutledge2007DiscoveryOA,
  title={Discovery of an Isolated Compact Object at High Galactic Latitude},
  author={Robert E. Rutledge and Derek B. Fox and A. H. Shevchuk},
  journal={The Astrophysical Journal},
  year={2007},
  volume={672},
  pages={1137 - 1143}
}

• R. Rutledge, D. Fox, A. S. Shevchuk
• Published 7 May 2007
• Physics
• The Astrophysical Journal

We report the discovery of a compact object at high Galactic latitude. The object was initially identified as a ROSAT All-Sky Survey Bright Source Catalog X-ray source, 1RXS J141256.0+792204, statistically likely to possess a high X-ray to optical flux ratio. Further observations using Swift, Gemini-North, and the Chandra X-Ray Observatory refined the source position and confirmed the absence of any optical counterpart to an X-ray to optical flux ratio of FX(0.1–2.4 keV)/FV > 8700 (3 σ). Interpretation of 1RXS J141256.0+792204—which we have dubbed Calvera—as a typical X-ray-dim isolated neutron star would place it at z ≈ 5.1 kpc above the Galactic disk—in the Galactic halo—implying that it either has an extreme space velocity (vz≳ 5100 km s−1) or has failed to cool according to theoretical predictions. Interpretations as a persistent anomalous X-ray pulsar or a “compact central object” present conflicts with these classes’ typical properties. We conclude that the properties of Calvera are most consistent with those of a nearby (80-260 pc) radio pulsar, similar to the radio millisecond pulsars of 47 Tucanae, with further observations required to confirm this classification. If it is a millisecond pulsar, it is has an X-ray flux equal to the X-ray brightest millisecond pulsar (and so is tied for highest flux); the closest northern hemisphere millisecond pulsar; and potentially the closest known millisecond pulsar in the sky, making it an interesting target for X-ray study, a radio pulsar timing array, and LIGO.