Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-06
Mon.Not.Roy.Astron.Soc.341:973,2003
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06482.x
We report on the results of an analysis in the X-ray band of a recent long ASCA observation of NGC 4395, the most variable low-luminosity AGN known. A relativistically-broadened iron line at ~6.4 keV is clearly resolved in the time-averaged spectrum, with an equivalent width of 310^{+70}_{-90} eV. Time-resolved spectral analysis of the heavily absorbed soft X-ray band confirms the existence of a variable, multi-zone warm absorber in this source, as proposed in a previous analysis of a shorter ASCA observation. The light curve of the source is wildly variable on timescales of hours or less, and a factor of nearly 10 change in count-rate was recorded in a period of less than 2000 s. The long observation and variability of the source allowed the power density spectrum (PDS) to be constructed to an unprecedented level of detail. There is evidence for a break in the PDS from a slope of \alpha~1 to \alpha~1.8 at a frequency of around 3 \times 10^{-4} Hz. The central black hole mass of NGC 4395 is estimated to be approximately 10^4-10^5 solar masses using the break in the PDS, a result consistent with previous analyses using optical and kinematical techniques.
Fabian Andrea C.
Iwasawa Kashuzi
Shih D. C.
No associations
LandOfFree
Evidence for an intermediate mass black hole and a multi-zone warm absorber in NGC 4395 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evidence for an intermediate mass black hole and a multi-zone warm absorber in NGC 4395, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for an intermediate mass black hole and a multi-zone warm absorber in NGC 4395 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-99198