The Distance of the Gamma-ray Binary 1FGL J1018.6-5856
Vanessa J. Napoli, M. Virginia McSwain, Amber N. Marsh Boyer, and, Rachael M. Roettenbacher
TL;DR
This paper uses Stromgren photometry to determine the reddening and distance of the gamma-ray binary 1FGL J1018.6-5856, providing updated measurements that refine its spatial placement.
Contribution
It presents new photometric measurements and analysis to estimate the reddening and distance of the gamma-ray binary, improving previous estimates.
Findings
Reddening E(B-V) = 1.34 +/- 0.04
Distance estimated at 5.4 (+4.6/-2.1) kpc
Distance is closer than some prior estimates
Abstract
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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Taxonomy
TopicsAstrophysical Phenomena and Observations · Gamma-ray bursts and supernovae · Pulsars and Gravitational Waves Research