Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345

Details Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345 Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.4106t&link_type=abstract

American Astronomical Society Meeting 210, #41.06; Bulletin of the American Astronomical Society, Vol. 39, p.155

Other

Scientific paper

We present the results of Chandra and XMM-Newton observations of the nearby spiral galaxy NGC 2403. We report on the discovery of the transient pulsating X-ray source CXOU J073709.1+653544 detected during the 2004, August-October observations. The X-ray source exhibits X-ray pulsations with a period of 18 s and a nearly sinusoidal pulse shape. The X-ray properties of the source and the absence of an optical/UV counterparts brighter than 20th magnitude allow us to identify CXOU J073709.1+653544 as accreting X-ray pulsar in NGC 2403. At the distance of 3.2 Mpc, this source is the most distant X-ray pulsar known to date. The maximum unabsorbed luminosity of the source in the 0.3-7 keV range, 2.6x1038 ergs/s, and the luminosity in the 0.3-100 keV energy range could be as high as 1039 ergs/s. The rate of decrease of the pulsation period of the source is one of the fastest observed among accreting pulsars. The evolution of the pulsation period suggests that it is dominated by the intrinsic spin-up of the compact object. The X-ray luminosity of CXOU J073709.1+653544 is high enough to account for the observed spin-up rate, assuming that the X-ray source is powered by disk accretion onto highly magnetized neutron star. Based on the transient behavior and overall X-ray properties of the source, we conclude that it could be an X-ray pulsar belonging to either a Be binary system or a low-mass system similar to the Galactic bursting pulsar GRO J1744-28. Another X-ray source, CXOU J073711.6+653345, shows variability consistent with an 18-hour periodic modulation of X-ray flux. The X-ray properties of the source and extreme faintness of the optical counterpart suggest its identification as accreting binary system in NGC 2403. We interpret the observed modulation as a result of the binary motion and discuss the nature of CXOU J073711.6+653345.

Affiliated with

Also associated with

No associations

Rating

Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345 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 Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra And XMM-Newton Observations Of NGC 2403: Discovery Of The Transient X-ray Pulsar CXOU J073709.1+653544 And An 18-hour Periodic Modulation In The X-ray Source CXOU J073711.6+653345 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1030587