SIMBAD references

2017ApJ...839...19L - Astrophys. J., 839, 19-19 (2017/April-2)

Analysis of quasi-periodic oscillations and time lag in ultraluminous X-ray sources with XMM-Newton.

LI Z.-J., XIAO G.-C., CHEN L., ZHANG S., BU Q.-C., ZHANG L., MA X., YAN L.-L. and QU J.-L.

Abstract (from CDS):

We investigated the power density spectrum (PDS) and time lag of ultraluminous X-ray sources (ULXs) observed by XMM-Newton. We determined the PDSs for each ULX and found that five of them show intrinsic variability due to obvious quasi-periodic oscillations (QPOs) of mHz-1 Hz, consistent with previous reports. We further investigated these five ULXs to determine their possible time lag. The ULX QPOs exhibit a soft time lag that is linearly related to the QPO frequency. We discuss the likelihood of the ULX QPOs being type-C QPO analogs, and the time lag models. The ULXs might harbor intermediate-mass black holes if their QPOs are type-C QPO analogs. We suggest that the soft lag and the linearity may be due to reverberation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - black hole physics - X-rays: binaries - X-rays: binaries

Simbad objects: 15

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