The Behaviour of the Optical and X-ray Emission from Scorpius X-1
| Autor: | B. J. McNamara, T. E. Harrison, R. T. Zavala, Eduardo Galvan, Javier Galvan, T. Jarvis, GeeAnn Killgore, O. R. Mireles, D. Olivares, B. A. Rodriquez, M. Sanchez, Allison L. Silva, Andrea L. Silva, E. Silva-Velarde, M. R. Templeton |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Astrophysics (astro-ph) X-ray Gamma ray FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences law.invention Telescope Neutron star Accretion rate 13. Climate action Space and Planetary Science Observatory law 0103 physical sciences Magnitude (astronomy) Optical emission spectroscopy 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.astro-ph/0302530 |
| Popis: | In 1970, Hiltner & Mook reported the results of the first multiyear study of the optical emission from Sco X-1. They found that the Sco X-1 B-magnitude histograms changed from year to year. Subsequent multi-wavelength campaigns confirmed the variable nature of these optical histograms and also found that the X-ray and optical emissions were only correlated when Sco X-1 was brighter than about B = 12.6. Models had suggested that the optical emission from this source arose from X-rays reprocessed in an accretion disk surrounding the central neutron star. It was therefore difficult to explain why the optical and X-ray fluxes were not more closely correlated. In 1994 and 1995, two new simultaneous optical and X-ray campaigns on Sco X-1 were conducted with the Burst and Transient Source Experiment on the Compton Gamma Ray Observatory and the 1 m Yale telescope at Cerro Tololo Inter-American Observatory. Using these data and models by Psaltis, Lamb & Miller, it is now possible to provide a qualitative picture of how the X-ray and optical emissions from Sco X-1 are related. Differences in the B-magnitude histograms are caused by variations in the mass accretion rate and the relatively short time period usually covered by optical investigations. The tilted Gamma pattern seen in plots of the simultaneous X-ray and optical emission from Sco X-1 arises from (1) the nearly linear relation between the optical B magnitude and the mass accretion rate in the range 13.3 > B > 12.3 and an asymptotic behaviour in the B magnitude outside this range, and (2) a double-valued relation between the X-ray emission and mass accretion rate along the normal branch and the lower flaring branch of this source. Accepted to the Astronomical Journal: 7 pages, 3 figures |
| Databáze: | OpenAIRE |
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