Line-of-sight Shell Structure of the Cygnus Loop

Details Line-of-sight Shell Structure of the Cygnus Loop Line-of-sight Shell Structure of the Cygnus Loop

2009-10-20

arxiv.org/abs/0910.3731v1

Astrophys.J.705:1152-1159, 2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

8 pages, 7 figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/705/2/1152

We conducted a comprehensive study on the shell structure of the Cygnus Loop using 41 observation data obtained by the Suzaku and the XMM-Newton satellites. To investigate the detailed plasma structure of the Cygnus Loop, we divided our fields of view into 1042 box regions. From the spectral analysis, the spectra obtained from the limb of the Loop are well fitted by the single-component non-equilibrium ionization plasma model. On the other hand, the spectra obtained from the inner regions are well fitted by the two-component model. As a result, we confirmed that the low-temperature and the high-temperature components originated from the surrounding interstellar matter (ISM) and the ejecta of the Loop, respectively. From the best-fit results, we showed a flux distribution of the ISM component. The distribution clearly shows the limb-brightening structure, and we found out some low-flux regions. Among them, the south blowout region has the lowest flux. We also found other large low-flux regions at slightly west and the northeast from the center. We estimated the former thin shell region to be 1.3 degrees in diameter and concluded that there exists a blowout along the line of sight in addition to the south blowout. We also calculated the emission measure distribution of the ISM component and showed that the Cygnus Loop is far from the result obtained by a simple Sedov evolution model. From the results, we support that the Cygnus Loop originated from a cavity explosion. The emission measure distribution also suggests that the cavity-wall density is higher in the northeast than that in the southwest. These results suggest that the thickness of the cavity wall surrounding the Cygnus Loop is not uniform.

Affiliated with

Also associated with

No associations

Rating

Line-of-sight Shell Structure of the Cygnus Loop 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 Line-of-sight Shell Structure of the Cygnus Loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line-of-sight Shell Structure of the Cygnus Loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-143449