Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343610s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #436.10; Bulletin of the American Astronomical Society, Vol. 41, p.308
Astronomy and Astrophysics
Astronomy
Scientific paper
We present our findings from a 30 kilosecond ACIS exposure following our discovery of the eighth isolated compact object, nicknamed "Calvera." When matched with data from Gemini, our present investigation improves Calvera's position beyond our Swift and HRC localizations and confirms the absence of an optical counterpart. Our timing analysis includes a search for X-ray pulsations with periods shorter than one second which we calculate must have less than 6.5% rms variability. For our spectral analysis, we consider the effect of photon pileup using XSPEC's "pileup" model and exclude a pileup-induced high-energy power-law tail. Our analysis also excludes a simple blackbody model, but we find that a neutron star hydrogen atmosphere model fits the data well and we explore the possibility of absorption features. We discuss the implications of our results and our motivations for additional observations.
Fox Derek B.
Rutledge Robert E.
Shevchuk Andrew
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