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The Nature of the Compact Object in the Hard X-Ray Source 4U2206+54

Published online by Cambridge University Press:  22 February 2018

J. M. Torrejón ,
I. Kreykenbohni ,
A. Orr ,
L. Titarchuk  and
I. Negueruela
J. M. Torrejón
Affiliation:
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politénica Superior, Universidad de Alicante, Spain
I. Kreykenbohni
Affiliation:
Institut für Astronomie und Astrophysik, Astronomie, Tübingen, Germany
A. Orr
Affiliation:
ESA/ESTEC Research and Science Support Division, Noordwijk, The Netherlands
L. Titarchuk
Affiliation:
US Naval Research Laboratory, Space Science Division, WashingtonUSA
I. Negueruela
Affiliation:
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politénica Superior, Universidad de Alicante, Spain

Extract

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We present an analysis of archival RXTE and BeppoSAX data of the X-ray source 4U2206+54. For the first time, high energy data (≥ 30 keV) is analyzed. The data is well described by comptonization models in which seed photons with temperatures between 1.1 keV arid 1.5 keV are comptonized by a hot plasma at 50 keV thereby producing a hard tail which extends up to 100 keV. From luminosity arguments it is shown that the area of the soft photons source must be small (r ≈ 1 km) and that the presence of an accretion disk in this system is unlikely. Here we report on the possible existence of a cyclotron line around 30 keV . The presence of a neutron star in the system is strongly favored by the available data.

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 208
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

Torrejón, J. M., Kreykenbohm, I., Orr, A., Titarchuk, L., Negueruela, I. 2003, A& A, submittedGoogle Scholar