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Correlated long-term optical and x-ray variations in NGC 5548

Correlated long-term optical and x-ray variations in NGC 5548
Correlated long-term optical and x-ray variations in NGC 5548
We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the relationship between the optical and X-ray continua. The X-ray light curve is strongly correlated with the optical light curve on long (~year) time-scales. The amplitude of the long-term optical variability in NGC5548 is larger than that of the X-ray variability (after accounting for the host galaxy contribution), implying that X-ray reprocessing is not the main source of the optical/X-ray correlation. The correlated X-ray and optical variations in NGC5548 may be caused by instabilities in the inner part of the accretion flow, where both the X-ray and optical emission regions may be located
galaxies: active-galaxies, individual (ngc 5548)-galaxies, seyfert-x-rays, galaxies
0004-637X
L53-L56
Uttley, Phillip
db770bd7-d97e-43f5-99d4-a585bccd352a
Edelson, Rick
322e69d7-f317-4551-9054-31235bca54bd
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Peterson, Bradley M.
ced340e7-3232-477e-bf0a-822a7fe67c92
Markowitz, Alex
10313a33-dc28-4439-b46a-b48032e0ba6d
Uttley, Phillip
db770bd7-d97e-43f5-99d4-a585bccd352a
Edelson, Rick
322e69d7-f317-4551-9054-31235bca54bd
McHardy, Ian
4f215137-9cc4-4a08-982e-772a0b24c17e
Peterson, Bradley M.
ced340e7-3232-477e-bf0a-822a7fe67c92
Markowitz, Alex
10313a33-dc28-4439-b46a-b48032e0ba6d

Uttley, Phillip, Edelson, Rick, McHardy, Ian, Peterson, Bradley M. and Markowitz, Alex (2003) Correlated long-term optical and x-ray variations in NGC 5548. Astrophysical Journal, 584 (2, part 2), L53-L56.

Record type: Article

Abstract

We combine the long-term optical light curve of the Seyfert 1 galaxy NGC5548 with the X-ray light curve measured by the Rossi X-ray Timing Explorer over 6 years, to determine the relationship between the optical and X-ray continua. The X-ray light curve is strongly correlated with the optical light curve on long (~year) time-scales. The amplitude of the long-term optical variability in NGC5548 is larger than that of the X-ray variability (after accounting for the host galaxy contribution), implying that X-ray reprocessing is not the main source of the optical/X-ray correlation. The correlated X-ray and optical variations in NGC5548 may be caused by instabilities in the inner part of the accretion flow, where both the X-ray and optical emission regions may be located

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Published date: 22 January 2003
Keywords: galaxies: active-galaxies, individual (ngc 5548)-galaxies, seyfert-x-rays, galaxies

Identifiers

Local EPrints ID: 38390
URI: http://eprints.soton.ac.uk/id/eprint/38390
ISSN: 0004-637X
PURE UUID: 81ec065a-300e-41c2-9ebb-0c4c2a58d3fa

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Date deposited: 09 Jun 2006
Last modified: 15 Mar 2024 08:07

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Contributors

Author: Phillip Uttley
Author: Rick Edelson
Author: Ian McHardy
Author: Bradley M. Peterson
Author: Alex Markowitz

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