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Chandra ACIS Survey of M33 (ChASeM33): X-ray Imaging Spectroscopy of
M33SNR21, the Brightest X-ray Supernova Remnant in M33 | Terrance J. Gaetz
; William P. Blair
; John P. Hughes
; P. Frank Winkler
; Knox S. Long
; Thomas G. Pannuti
; Benjamin Williams
; Richard J. Edgar
; Parviz Ghavamian
; Paul P. Plucinsky
; Manami Sasaki
; Robert P. Kirshner
; Miguel Avillez
; Dieter Breitschwerdt
; | Date: |
18 Jun 2007 | Abstract: | We present and interpret new X-ray data for M33SNR21, the brightest X-ray
supernova remnant (SNR) in M33. The SNR is in seen projection against (and
appears to be interacting with) the bright HII region NGC592. Data for this
source were obtained as part of the Chandra ACIS Survey of M33 (ChASeM33) Very
Large Project. The nearly on-axis Chandra data resolve the SNR into a ~5"
diameter (20 pc at our assumed M33 distance of 817+/-58 kpc) slightly
elliptical shell. The shell is brighter in the east, which suggests that it is
encountering higher density material in that direction. The optical emission is
coextensive with the X-ray shell in the north, but extends well beyond the
X-ray rim in the southwest. Modeling the X-ray spectrum with an absorbed sedov
model yields a shock temperature of 0.46(+0.01,-0.02) keV, an ionization
timescale of n_e t = $2.1 (+0.2,-0.3) imes 10^{12}$ cm$^{-3}$ s, and
half-solar abundances (0.45 (+0.12, -0.09)). Assuming Sedov dynamics gives an
average preshock H density of 1.7 +/- 0.3 cm$^{-3}$. The dynamical age estimate
is 6500 +/- 600 yr, while the best fit $n_e t$ value and derived $n_e$ gives
8200 +/- 1700 yr; the weighted mean of the age estimates is 7600 +/- 600 yr. We
estimate an X-ray luminosity (0.25-4.5 keV) of (1.2 +/- 0.2) times $10^{37}$
ergs s$^{-1}$ (absorbed), and (1.7 +/- 0.3) times $10^{37}$ ergs s$^{-1}$
(unabsorbed), in good agreement with the recent XMM-Newton determination. No
significant excess hard emission was detected; the luminosity $le 1.2 imes
10^{35}$ ergs s$^{-1}$ (2-8 keV) for any hard point source. | Source: | arXiv, arxiv.0706.2663 | Services: | Forum | Review | PDF | Favorites |
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