Correlated X-ray and optical variability in KV UMa

Details Correlated X-ray and optical variability in KV UMa Correlated X-ray and optical variability in KV UMa

2002-05-24

arxiv.org/abs/astro-ph/0205431v2

Astronomy and Astrophysics

Astrophysics

A&A accepted

Scientific paper

10.1051/0004-6361:20020789

We present coordinated X-ray and optical observations of the X-ray transient KV UMa (= XTE J1118+480) at high time resolution. The optical variation associated with spikes in the X-rays consist of a dip preceding the spike by 0-5 s, and a peak following it. The cross-correlation function between X-rays and optical has the same shape. It rises sharply, within 30ms of the peak of the X-rays. The shape of the cross correlation shows significant intrinsic variability on time scales as short as 30s. Analyzing this variability with principal component analysis (calibrated with simulated data), we find two statistically independent components. The first is similar to the average cross-correlation. The second also consists of a dip followed by a peak, but on a 3x shorter time scale. These properties of the optical light, together with the high optical brightness of the transient, are not easily explained by reprocessing of the X-rays.

Affiliated with

Also associated with

No associations

Rating

Correlated X-ray and optical variability in KV UMa 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 Correlated X-ray and optical variability in KV UMa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correlated X-ray and optical variability in KV UMa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-420436