The Distance of the Gamma-ray Binary 1FGL J1018.6-5856

Details The Distance of the Gamma-ray Binary 1FGL J1018.6-5856 The Distance of the Gamma-ray Binary 1FGL J1018.6-5856

2011-09-16

arxiv.org/abs/1109.3692v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted to PASP

Scientific paper

The recently discovered gamma-ray binary 1FGL J1018.6-5856 has a proposed optical/near-infrared (OIR) counterpart 2MASS 10185560-5856459. We present Stromgren photometry of this star to investigate its photometric variability and measure the reddening and distance to the system. We find that the gamma-ray binary has E(B-V) = 1.34 +/- 0.04 and d = 5.4^+4.6_-2.1 kpc. While E(B-V) is consistent with X-ray observations of the neutral hydrogen column density, the distance is somewhat closer than some previous authors have suggested.

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