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

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915311n&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.11

Astronomy and Astrophysics

Astronomy

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.
We are grateful for support from NSF grants PHY-0849416 and AST-1109247, the NASA Harriett G. Jenkins Pre-doctoral Fellowship program, the Sigma Xi Grant-in-Aid of Research program, and Lehigh University.

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