# 1999A&A...342..839B

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 Query : 1999A&A...342..839B

1999A&A...342..839B - Astronomy and Astrophysics, volume 342, 839-853 (1999/2-3)

ROSAT PSPC observation of the NE region of the Vela supernova remnant. III. The two-component nature of the X-ray emission and its implications on the ISM.

BOCCHINO F., MAGGIO A. and SCIORTINO S.

Abstract (from CDS):

We reconsider two ROSAT observations of the Vela SNR shock region, with the aim to overcome the problems encountered in interpreting the X-ray spectra in terms of single-temperature NEI emission model. We pursue the idea of the association of the observed cool and hot components with an high-density (inhomogeneities") and a low-density (intercloud") ISM phase, respectively. We derive the density (0.5-1.0cm–3) and the volume filling factor (0.2-0.8) of the inhomogeneities on a scale length of 10' (∼1pc), and we identify two regions of the main shock interactions, one with a small (∼1pc) isolated cloud, and the other with a larger feature (∼4-5pc, perhaps a cavity wall). We argue that the thermal evaporation from shocked clouds may account for the mass of observed inhomogeneities. After isolating the emission of the dynamically unperturbed intercloud medium, we apply the Sedov analysis and estimate the explosion energy of the supernova event (E0∼1.2x1050erg) and the distance (∼280pc, in agreement with recent results). Our data also indicate fast electron-ion equipartition behind the shock. The influence of Non-Equilibrium of Ionization effects on our conclusions are estimated.

Journal keyword(s): X-rays: ISM - ISM: supernova remnants - ISM: structure - ISM: individual objects: Vela supernova remnant - ISM: general - ISM: clouds

 Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SNR G156.2+05.7 SNR 04 58 51.300 +51 50 28.00           ~ 119 1
2 IC 443 SNR 06 18 02.7 +22 39 36     10.11     ~ 1165 1
3 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1167 2
4 SNR G292.0+01.8 SNR 11 24 59 -59 19.1           ~ 305 1
5 SNR G296.1-00.7 SNR 11 51.2 -62 46           ~ 7 0
6 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1260 1
7 SNR G019.0-01.1 SNR 18 29.3 -12 54           ~ 20 1
8 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 891 2
9 CTB 1 SNR 23 59 13 +62 26.2           ~ 147 0

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2022.05.24-07:39:04