Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1

Details Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1 Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1407s&link_type=abstract

American Astronomical Society, HEAD meeting #9, #14.07; Bulletin of the American Astronomical Society, Vol. 38, p.377

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the discovery with XMM-Newton of a 20 mHz quasiperiodic oscillation (QPO) in the 0.2 - 5 keV X-ray flux from the ultraluminous X-ray source NGC 5408 X-1. EPIC-PN data reveal a QPO with an average amplitude (rms) of 9%, and a coherence of approximately 10. A powerlaw noise component with slope near 1 is present below 0.1 Hz with some evidence for a break to a flatter slope at about 3 mHz. The source shows substantial variability, with a total amplitude (rms) of about 30% in the 0.1 - 100 mHz frequency band. The sources broad band variability (both its form and strength) is somewhat reminiscent of Galactic black holes in the low - hard state, but its energy spectrum is not. A connection with the very-high states of Galactic systems may be more appropriate. NGC 5408 X-1 is now the 2nd ULX to show QPOs in the 10 - 100 mHz range (along with the M82 ULX). Interestingly, the power spectra of these two objects are roughly similar, but with M82 scaled up in frequency by a factor of a few. We discuss our results in the context of models for ULXs, and their implications for the object's mass.

Affiliated with

Also associated with

No associations

Rating

Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1 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 Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery with XMM/Newton Of Quasiperiodic Variability In The Ultraluminous X-ray Source NGC 5408 X-1 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-777930