Buxton, Michelle M. and Bailyn, Charles D. and Capelo, Holly L. and Chatterjee, Ritaban and Dinçer, Tolga and Kalemci, Emrah and Tomsick, John A. (2012) Optical and near-infrared monitoring of the black hole x-ray binary GX 339-4 during 2002-2010. The Astronomical Journal, 143 (6). ISSN 0004-6256 (Print) 1538-3881 (Online)
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Official URL: http://dx.doi.org/10.1088/0004-6256/143/6/130
Abstract
We present the optical/infrared (O/IR) light curve of the black hole X-ray binary GX 339-4 collected at the SMARTS 1.3 m telescope from 2002 to 2010. During this time the source has undergone numerous state transitions including hard-to-soft state transitions when we see large changes in the near-IR flux accompanied by modest changes in optical flux, and three rebrightening events in 2003, 2005, and 2007 after GX 339-4 transitioned from the soft state to the hard. All but one outburst show similar behavior in the X-ray hardness-intensity diagram. We show that the O/IR colors follow two distinct tracks that reflect either the hard or soft X-ray state of the source. Thus, either of these two X-ray states can be inferred from O/IR observations alone. From these correlations we have constructed spectral energy distributions of the soft and hard states. During the hard state, the near-IR data have the same spectral slope as simultaneous radio data when GX 339-4 was in a bright optical state, implying that the near-IR is dominated by a non-thermal source, most likely originating from jets. Non-thermal emission dominates the near-IR bands during the hard state at all but the faintest optical states, and the fraction of non-thermal emission increases with increasing optical brightness. The spectral slope of the optical bands indicate that a heated thermal source is present during both the soft and hard X-ray states, even when GX 339-4 is at its faintest optical state. We have conducted a timing analysis of the light curve for the hard and soft states and find no evidence of a characteristic timescale within the range of 4-230 days.
Item Type: | Article |
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Additional Information: | Article Number: 130 |
Uncontrolled Keywords: | binaries: close; black hole physics; infrared: stars; radiation mechanisms: non-thermal; radiation mechanisms: thermal; stars: individual (GX 339-4) |
Subjects: | Q Science > QB Astronomy > QB460-466 Astrophysics Q Science > QC Physics |
Divisions: | Faculty of Engineering and Natural Sciences > Basic Sciences > Physics Faculty of Engineering and Natural Sciences |
Depositing User: | Emrah Kalemci |
Date Deposited: | 21 Jun 2012 16:33 |
Last Modified: | 31 Jul 2019 11:03 |
URI: | https://research.sabanciuniv.edu/id/eprint/19120 |
Available Versions of this Item
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Optical and near infrared monitoring of the black-hole x-ray binary GX 339-4 during 2002-2010. (deposited 24 Nov 2011 11:32)
- Optical and near-infrared monitoring of the black hole x-ray binary GX 339-4 during 2002-2010. (deposited 21 Jun 2012 16:33) [Currently Displayed]