SIMBAD references

2007ApJ...661..165L - Astrophys. J., 661, 165-172 (2007/May-3)

Optical studies of the ultraluminous X-ray source NGC 1313 X-2.


Abstract (from CDS):

NGC 1313 X-2 was among the first ultraluminous X-ray sources discovered, and has been a frequent target of X-ray and optical observations. Using the HST ACS multiband observations, this source is identified with a unique counterpart within an error circle of 0.2". The counterpart is a blue star on the edge of a young cluster of ≤107 yr amid a dominant old stellar population. Its spectral energy distribution is consistent with that for a Z=0.004 star with 8.5 M about 5x106 yr old, or for an O7 V star at solar metallicity. The counterpart exhibited significant variability of Δm=0.153±0.033 mag between two F555W observations separated by 3 months, reminiscent of the ellipsoidal variability due to the orbital motion of this ULX binary.

Abstract Copyright:

Journal keyword(s): Galaxies: Individual: NGC Number: NGC 1313 - X-Rays: Binaries

Nomenclature: Fig.1, Table 2: [LBM2007] XN (Nos X3, X4).

CDS comments: ULX NGC 1313 X-2 = [CPS95] X-2.

Simbad objects: 16

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