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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The variable radio-to-x-ray spectrum of the magnetar XTE J1810-197
Astrophysical Journal, Volume 669, No. 1, Year 2007
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Description
We have observed the 5.54 s anomalous X-ray pulsar XTE J1810-197at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its broadband spectrum. At the IRAM 30 m telescope, we have detected the magnetar at ν = 88 and 144 GHz, the highest radio-frequency emission ever seen from a pulsar. At 88 GHz we detected numerous individual pulses, with typical widths ∼2 ms and peak flux densities up to 45 Jy. Together with nearly contemporaneous observations with the Parkes, Nançay, and Green Bank telescopes, we find that in late 2006 July the spectral index of the pulsar was -0.5 ≲ α ≲ 0 (with flux density Sν ∝ να) over the range 1.4-144 GHz. Nine dualfrequency Very Large Array and Australia Telescope Compact Array observations in 2006 May-September are consistent with this finding, while showing variability of α with time. We infer from the IRAM observations that XTE J1810-197 remains highly linearly polarized at millimeter wavelengths. Also, toward this pulsar, the transition frequency between strong and weak scattering in the interstellar medium may be near 50 GHz. At Gemini, we detected the pulsar at 2,2 μm in 2006 September, at the faintest level yet observed, Ks = 21.89 ± 0.15. We have also analyzed four archival IR Very Large Telescope observations (two unpublished), finding that the brightness fluctuated within a factor of 2-3 over a span of 3 years, unlike the monotonie decay of the X-ray flux. Thus, there is no correlation between IR and X-ray flux, and it remains uncertain whether there is any correlation between IR and radio flux. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Camilo, Fernando
United States, New York
Columbia University
Ransom, Scott M.
United States, Charlottesville
National Radio Astronomy Observatory
Peñalver, Juan
Unknown Affiliation
Karastergiou, Aris
France, Saint Martin D'heres
Iram Institut de Radioastronomie Millimétrique
van Kerkwijk, Marten H.
Canada, Toronto
University of Toronto
Durant, Martin
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Halpern, Jules P.
United States, New York
Columbia University
Reynolds, John E.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Thum, Clemens
France, Saint Martin D'heres
Iram Institut de Radioastronomie Millimétrique
Cognard, Ismaël
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
Statistics
Citations: 76
Authors: 10
Affiliations: 7
Identifiers
Doi:
10.1086/521548
ISSN:
0004637X
Research Areas
Environmental