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Searching EUVE Data for Transient/Flaring Extreme Ultraviolet Sources

Published online by Cambridge University Press:  12 April 2016

J. Lewis ,
S. Bowyer ,
M. Lampton ,
X. Wu  and
M. Mathioudakis
J. Lewis
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
S. Bowyer
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
M. Lampton
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
X. Wu
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA
M. Mathioudakis
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge Street, University of California, Berkeley, CA 94720-5030, USA

Abstract

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The Extreme Ultraviolet Explorer (EUVE), because of its sky survey strategy, performed two observations of each point along a 180° by 1° strip of the ecliptic during the initial survey phase of the mission. One observation used the deep survey telescope, and another, 90 days earlier or later, used the all sky scanner telescopes, two of which have a nearly identical passband to that of the ecliptic deep survey. Since the completion of the initial sky survey, EUVE has been used to carry out deep, pointed observations of selected targets. Many areas of the sky have therefore been observed two or more times, allowing us to compare count rates for some objects over a long temporal baseline. Objects with significantly varying count rates for widely separated times are of particular astrophysical interest.

With this technique, we have discovered one such object, which appears in the First EUVE Source Catalog as EUVE J2056-171. We present upper and lower limits on how frequently other highly-variable objects will be detected by EUVE in future observations.

Type
XI. Searching for New EUV Sources and Transients
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 481 - 484
Copyright
Copyright © Kluwer 1996

References

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