2009MNRAS.398L..16J -
Mon. Not. R. Astron. Soc., 398, L16-L20 (2009/September-1)
The Seyfert AGN RX J0136.9-3510 and the spectral state of super Eddington accretion flows.
JIN C., DONE C., WARD M., GIERLINSKI M. and MULLANEY J.
Abstract (from CDS):
We have carried out a survey of long 50 ks XMM-Newton observations of a sample of bright, variable active galactic nuclei (AGN). We found a distinctive energy dependence of the variability in RX J0136.9-3510 where the fractional variability increases from 0.3 to 2 keV, and then remains constant. This is in sharp contrast to other AGN where the X-ray variability is either flat or falling with energy, sometimes with a peak at ∼2 keV superimposed on the overall trend. Intriguingly, these unusual characteristics of the variability are shared by one other AGN, namely RE J1034+396, which is so far unique showing a significant X-ray quasi-periodic oscillation (QPO). In addition, the broad-band spectrum of RX J0136.9-3510 is also remarkably similar to that of RE J1034+396, being dominated by a huge soft excess in the Extreme-UV (EUV) to soft X-ray bandpass. The bolometric luminosity of RX J0136.9-3510 gives an Eddington ratio of about 2.7 for a black hole mass (from the H beta line width) of 7.9x107M☉. This mass is about a factor of 50 higher than that of RE J1034+396, making any QPO undetectable in this length of observation. None the less, its X-ray spectral and variability similarities suggest that RE J1034+396 is simply the closest representative of a new class of AGN spectra, representing the most extreme mass accretion rates.
Abstract Copyright:
© 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s):
accretion, accretion discs - galaxies: active - galaxies: individual: RX J0136.9-3510 - galaxies: nuclei - galaxies: Seyfert - X-rays: galaxies
Simbad objects:
7
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