Discovery And Multi-wavelength Observations Of The New X-ray Transient Source Swift J1357.2-0933

Details Discovery And Multi-wavelength Observations Of The New X-ray Transient Source Swift J1357.2-0933 Discovery And Multi-wavelength Observations Of The New X-ray Transient Source Swift J1357.2-0933

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823009k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #230.09; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the discovery by the Swift Gamma-Ray Burst Explorer of the transient source Swift J1357.2-0933 and the subsequent course of an outburst beginning in January 2011. The source is most likely a low-mass X-ray binary, although it is not yet clear whether the compact object is a black hole or neutron star. The object is off the galactic plane (galactic latitude = +50.003 degrees), so it is likely nearby (1-10 kpc), since an extra-galactic origin is ruled out by the large ( 6 magnitude) amplitude of the outburst in the optical.
This interpretation means that the measured X-ray and radio flux are both underluminous compared to typical black hole X-ray binaries. In the power spectrum there are no clear pulsations, while there is evidence of a low frequency quasi-periodic oscillation.
The source was observed for more than a month with multiple instruments and we report on observations with the Swift Burst Alert Telescope, X-Ray Telescope and Ultraviolet/Visible Telescope, the RXTE Proportional Counter Array, the PAIRITEL near-infrared telescope and the EVLA at 4.6 and 7.9 GHz. The rise in hard X rays from an undetectable level lasted about 2 days. The initial optical light curve shows a very slow decay ( 0.3 magnitudes over 24 days) in all bands, while in X rays, the rate is steady for the first six days, followed by a more rapid decline with a flat hardness ratio (0.3-1.5 kev/1.5-10.0 keV). The spectrum during this period is well-fitted by a simple absorbed power law with photon index 1.6 with no need for a thermal component.
We report on the multi-wavelength observations of Swift J1357.2-0933 and discuss the evidence in support and opposition to various models for the nature of this new nearby X-ray source.

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