X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3

Details X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3

2009-07-05

arxiv.org/abs/0907.0837v2

Astrophys.J.712:380-391,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

28 pages, 9 figures, 6 tables, Accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/712/1/380

We report on the Chandra X-ray Observatory and Hubble Space Telescope observation of two low core density globular clusters, NGC6144 and E3. By comparing the number of X-ray sources inside the half-mass radius to those outside, we found 6 X-ray sources within the half-mass radius of NGC6144, among which 4 are expected to be background sources; 3 X-ray sources are also found within the half-mass radius of E3, of which 3 is expected to be background source. Therefore, we cannot exclude that all our sources are background sources. However, combining the results from X-ray and optical observations, we found that 1-2 sources in NGC6144 and 1 source in E3 are likely to be cataclysmic variables and that 1 source in NGC6144 is an active binary, based on the X-ray and optical properties. The number of faint X-ray sources in NGC6144 and E3 found with Chandra and HST is higher than a prediction based on collision frequency, but is closer to that based on mass. Our observations strongly suggest that the compact binary systems in NGC6144 and E3 are primordial in origin.

Affiliated with

Also associated with

No associations

Rating

X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 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 X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-187387