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The 2005 outburst of the halo black hole X-ray transient XTE J1118+480

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Zurita, C., Torres, M. A. P., Steeghs, D. (Danny), 1972-, Rodríguez-Gil, P., Muñoz-Darias, T., Casares, J., Shahbaz, T., Martinez-Pais, I. G., Zhao, P., Garcia, M. R., Piccioni, A., Bartolini, C., Guarnieri, A., Bloom, Joshua S., 1974-, Blake, C. H., Falco, E. E. (Emilio E.), 1954-, Szentgyorgyi, A. and Skrutskie, M.. (2006) The 2005 outburst of the halo black hole X-ray transient XTE J1118+480. The Astrophysical Journal, Vol.644 (No.1). pp. 432-438. ISSN 0004-637X

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Abstract

We present optical and infrared monitoring of the 2005 outburst of the halo black hole X-ray transient XTE J1118+480. We measured a total outburst amplitude of ~5.7 ± 0.1 mag in the R band and ~5 mag in the infrared J, H, and Ks bands. The hardness ratio HR2 (5-12 keV : 3-5 keV) from the RXTE ASM data is 1.53 ± 0.02 at the peak of the outburst, indicating a hard spectrum. Both the shape of the light curve and the ratio LX(1-10 keV)/Lopt resemble the minioutbursts observed in GRO J0422+32 and XTE J1859+226. During early decline, we find a 0.02 mag amplitude variation consistent with a superhump modulation, like the one observed during the 2000 outburst. Similarly, XTE J1118+480 displayed a double-humped ellipsoidal modulation distorted by a superhump wave when settled into a near-quiescence level, suggesting that the disk expanded to the 3 : 1 resonance radius after outburst, where it remained until early quiescence. The system reached quiescence at R = 19.02 ± 0.03, about 3 months after the onset of the outburst. The optical rise preceded the X-ray rise by at most 4 days. The spectral energy distributions (SEDs) at the different epochs during outburst are all quasi-power laws with Fν να increasing toward the blue. At the peak of the outburst, we derived α = 0.49 ± 0.04 for the optical data alone and α = 0.1 ± 0.1 when fitting solely the infrared. This difference between the optical and the infrared SEDs suggests that the infrared is dominated by a different component (a jet?), whereas the optical is presumably showing the disk evolution.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Black holes (Astronomy), X-ray bursts
Journal or Publication Title: The Astrophysical Journal
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0004-637X
Official Date: 2006
Volume: Vol.644
Number: No.1
Page Range: pp. 432-438
Identification Number: 10.1086/503286
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: United States. National Aeronautics and Space Administration (NASA), Smithsonian Astrophysical Observatory, Harvard University, University of California, Berkeley
Grant number: NAG-5-10889 (NASA)
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URI: http://wrap.warwick.ac.uk/id/eprint/48761

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