Discovery of an Isolated Compact Object at High Galactic Latitude
Abstract
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 (vzgtrsim 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2008
- DOI:
- 10.1086/522667
- arXiv:
- arXiv:0705.1011
- Bibcode:
- 2008ApJ...672.1137R
- Keywords:
-
- stars: neutron;
- X-rays: general;
- Astrophysics
- E-Print:
- ApJ, in press. We are grateful to the anonymous referee, who pointed us toward a better XRT response matrix which changes our quantitative conclusions somewhat