NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-24 T00:15:01 PDT
Help | Comment | NED Home

For refcode 2001ApJ...550L..15P:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...550L..15P X-Ray Power Density Spectrum of the Narrow-Line Seyfert 1 Galaxy Arakelian 564 Ken Pounds, Rick Edelson, Alex Markowitz, and Simon Vaughan Received 2000 December 12; accepted 2001 January 31; published 2001 March 12 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 x 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. Subject headings: galaxies: active-galaxies: individual (Arakelian 564)-galaxies: Seyfert-X-rays: galaxies
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home