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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Optical, infrared, and ultraviolet observations of the X-ray flash XRF 050416A
Astronomical Journal, Volume 133, No. 1, Year 2007
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Description
We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 s and 36 days after the burst. We find an intrinsic spectral slope between 1930 and 22200 A of β= -1.14 ± 0.20 and a decay rate of a = -0.86 ± 0.15. There is no evidence for a change in the decay rate between approximately 0.7 and 4.7 days after the burst. Our data imply that there is no spectral break between the optical and X-ray bands between 0.7 and 4.7 days after the burst and are consistent with the cooling break being redward of the KS, band (22200 Å) at 0.7 days. The combined ultraviolet/optical/infrared spectral energy distribution shows no evidence for a significant amount of extinction in the host galaxy along the line of sight to XRF 050416A. Our data suggest that the extragalactic extinction along the line of sight to the burst is only approximately AV = 0.2 mag, which is significantly less than the extinction expected from the hydrogen column density inferred from X-ray observations of XRF 050416A assuming a dust-to-gas ratio similar to what is found for the Milky Way. The observed extinction, however, is consistent with the dust-to-gas ratio seen in the Small Magellanic Cloud. We suggest that XRF 050416A may have a two-component jet similar to what has been proposed for GRB 030329. If this is the case, the lack of an observed jet break between 0.7 and 42 days is an illusion due to emission from the wide jet dominating the afterglow after approximately 1.5 days. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Holland, S. T.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, Columbia
Universities Space Research Association
Boyd, Patricia T.
United States, Greenbelt
Nasa Goddard Space Flight Center
Gorosabel, Javier
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Hjorth, Jens
Denmark, Copenhagen
Niels Bohr Institutet
Schady, Patricia
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
United States, University Park
Pennsylvania State University
Thomsen, B.
Denmark, Aarhus
Aarhus Universitet
Augusteijn, Thomas
Spain, Brena Baja
Nordic Optical Telescope
Blustin, A. J.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Breeveld, A. A.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
de Pasquale, Massimiliano
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Fynbo, Johan Peter Uldall
Denmark, Copenhagen
Niels Bohr Institutet
Gehrels, Neil C.
United States, Greenbelt
Nasa Goddard Space Flight Center
Gronwall, Caryl A.
United States, University Park
Pennsylvania State University
Hunsberger, S.
United States, University Park
Pennsylvania State University
Ivanushkina, M.
United States, University Park
Pennsylvania State University
United States, Provo
Brigham Young University
Landsman, W.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, Lanham
Science Systems and Applications, Inc. Ssai
Laursen, Peter
Denmark, Copenhagen
Niels Bohr Institutet
McGowan, Katherine E.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
United Kingdom, Southampton
University of Southampton
Mangano, Vanessa
Italy, Palermo
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica Di Palermo
Markwardt, Craig B.
United States, Greenbelt
Nasa Goddard Space Flight Center
Marshall, Francis E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Mason, Keith O.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
United Kingdom, Swindon
Particle Physics and Astronomy Research Council
Moretti, A.
Italy, Merate
Osservatorio Astronomico Di Brera
Page, Mathew J.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Poole, T.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Roming, Peter W.A.
United States, University Park
Pennsylvania State University
Rosen, Simon R.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Still, Martin D.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, Columbia
Universities Space Research Association
South Africa, Cape Town
South African Astronomical Observatory
Statistics
Citations: 28
Authors: 28
Affiliations: 15
Identifiers
Doi:
10.1086/509656
ISSN:
00046256
Research Areas
Environmental