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Title: X-ray Power Density Spectrum of the Narrow-Line Seyfert 1 Galaxy Arakelian 564
Authors: Pounds, Ken
Edelson, R.
Markowitz, A.
Vaughan, Simon
First Published: 3-Mar-2001
Publisher: American Astronomical Society, IOP Publishing
Citation: Astrophysical Journal, 2001, 550 (1), pp. L15-L18
Abstract: Beginning in 1999 January, the bright, strongly variable narrow-line Seyfert 1 (NLS1) galaxy Akn 564 has been observed by RXTE once every ~4.3 days. It was also monitored every ~3.2 hr throughout 2000 July. These evenly sampled observations have allowed the first quantitative comparison of long- and short-timescale X-ray variability in an NLS1 galaxy and the derivation of an X-ray power density spectrum (PDS). The variability amplitude in the short-timescale light curve is very similar to that in the long-timescale light curve, in marked contrast to the stronger variability on longer timescales, which is characteristic of "normal" broad-line Seyfert 1 (BLS1) galaxies. Furthermore, the Akn 564 PDS power law cuts off at a frequency of 8.7 × 10-7 Hz, corresponding to a timescale of ~13 days, significantly shorter than that seen in the PDS of NGC 3516, a BLS1 galaxy of comparable luminosity. This result is consistent with NLS1 galaxies showing faster (as opposed to larger amplitude) variations than BLS1 galaxies, providing further evidence that NLS1 galaxies harbor lower mass black holes than BLS1 galaxies of similar luminosity, accreting at a correspondingly higher relative rate.
ISSN: 0004-637X
eISSN: 1538-4357
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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