2022A&A...661A..19B


Query : 2022A&A...661A..19B

2022A&A...661A..19B - Astronomy and Astrophysics, volume 661A, 19-19 (2022/5-1)

Spatially resolved X-ray spectra of the galactic SNR G18.95-1.1: SRG/eROSITA view.

BYKOV A.M., UVAROV Y.A., CHURAZOV E.M., GILFANOV M.R. and MEDVEDEV P.S.

Abstract (from CDS):


Aims. We study the X-ray emission of the galactic supernova remnant (SNR) G18.95-1.1 with the eROSITA telescope on board the Spectrum Rontgen Gamma (SRG) orbital observatory. In addition to the pulsar wind nebula that was previously identified and examined by ASCA and Chandra, we study the X-ray spectra of the bright SNR ridge, which is resolved into a few bright clumps.
Methods. The wide field of view and the large collecting area in the 0.2-2.3 keV energy range of SRG/eROSITA allowed us to perform spatially resolved spectroscopy of G18.95-1.1.
Results. The X-ray ridge of G18.95-1.1 is asymmetric, indicating either supernova ejecta asymmetry or their interaction with a cloud. The X-ray dim northern regions outside the pulsar wind nebula can be described by a thin thermal plasma emission with a temperature ∼0.3keV and a solar composition. The X-ray spectra of a few bright clumps located along the southern ridge may be satisfactorily approximated by a single thermal component of the Si-rich ejecta at the collisional ionization equilibrium with a temperature of about 0.3 keV. The bright ridge can be alternatively fit with a single component that is not dominated by equilibrium ejecta with T ∼ 0.6 keV. The high ratio of the derived Si/O abundances indicates that the ejecta originated in deep layers of the progenitor star. The plasma composition of a southern Si-rich clump and the bright ridge are similar to what was earlier found in the Vela shrapnel A and G.

Abstract Copyright: © ESO 2022

Journal keyword(s): ISM: supernova remnants - X-rays: individuals: SNR G18.95-1.1 - X-rays: ISM

Simbad objects: 27

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Number of rows : 27
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 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1173 2
2 3A 1510-590 Psr 15 13 17.000 -59 04 54.00           ~ 389 3
3 eRASSt J182808.9-125240 X 18 28 08.928 -12 52 40.44           ~ 1 0
4 eRASSt J182812.3-124715 X 18 28 12.336 -12 47 15.00           ~ 1 0
5 eRASSt J182815.7-125023 X 18 28 15.792 -12 50 23.64           ~ 1 0
6 eRASSt J182833.6-125056 X 18 28 33.696 -12 50 56.40           ~ 1 0
7 eRASSt J182836.3-125950 X 18 28 36.384 -12 59 50.28           ~ 1 0
8 eRASSt J182843.2-124403 X 18 28 43.248 -12 44 03.48           ~ 1 0
9 TYC 5698-714-1 * 18 28 50.0739029064 -13 01 20.442310320   11.61 11.59     ~ 2 0
10 eRASSt J182858.4-130042 X 18 28 58.416 -13 00 42.84           ~ 1 0
11 eRASSt J182905.7-124138 X 18 29 05.784 -12 41 38.04           ~ 1 0
12 eRASSt J182909.0-124105 X 18 29 09.000 -12 41 05.64           ~ 1 0
13 CXOU J182913.1-125113 Psr 18 29 13.1 -12 51 13           ~ 3 1
14 eRASSt J182922.4-124151 X 18 29 22.440 -12 41 51.72           ~ 1 0
15 eRASSt J182924.9-124534 X 18 29 24.912 -12 45 34.92           ~ 1 0
16 FL8Y J1829.5-1254 gam 18 29.5 -12 54           ~ 1 0
17 SNR G018.95-01.1 SNR 18 29.5 -12 56           ~ 3 0
18 eRASSt J182931.7-131646 X 18 29 31.776 -13 16 46.56           ~ 1 0
19 eRASSt J182934.5-130117 X 18 29 34.560 -13 01 17.76           ~ 1 0
20 eRASSt J182942.4-130648 X 18 29 42.408 -13 06 48.24           ~ 1 0
21 eRASSt J182959.0-130320 X 18 29 59.064 -13 03 20.88           ~ 1 0
22 eRASSt J183003.2-125426 X 18 30 03.288 -12 54 26.64           ~ 1 0
23 eRASSt J183017.4-125020 X 18 30 17.400 -12 50 20.04           ~ 1 0
24 eRASSt J183029.1-124905 X 18 30 29.112 -12 49 05.16           ~ 1 0
25 eRASSt J183044.5-125000 X 18 30 44.520 -12 50 00.96           ~ 1 0
26 NAME Cas A SNR 23 23 24.000 +58 48 54.00     14.30     ~ 2619 1
27 NAME Galactic Ridge ? ~ ~           ~ 469 1

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2022.08.09-16:37:21

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