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Face-on SS 433 Stars as a Possible New Type of Extragalactic X-Ray Sources

Published online by Cambridge University Press:  13 May 2016

S. Fabrika  and
A. Mescheryakov
S. Fabrika
Affiliation:
Special Astrophysical Observatory, Nizhnij Arkhyz, Russia
A. Mescheryakov
Affiliation:
Sternberg Astronomical Institute, Moscow, Russia

Abstract

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The object SS433 is a well-known source of relativistic jets, which are formed in supercritical accretion disk. It is very probable that the disk has polar channels and their radiation is collimated (the photo-cones). A face-on SS433 object can appear as ultra-bright and highly variable X-ray source, Lx ˜ 1040 − 1042 erg/s. We discuss the properties of these hypothetical objects and their frequency expected in galaxies. We describe a search for such objects using the ROSAT All Sky Survey and RC3 catalog of galaxies. Among the total 418 positive correlations we find that 142 sources in S and Irr galaxies are unknown as AGNs. Nuclear sources among them still contain many AGNs. Non-nuclear (offset) sources are rather hard, their X-ray luminosities are 1039 − 1041 erg/s. Their observed frequency is about 4–5% per galaxy, that is in agreement with expected frequency of the face-on SS 433 stars. The only way to recognize such stars is their expected violent variability in X rays.

Type
Star Formation Regions and Outflow Processes in our Galaxy
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 268 - 269
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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