2003A&A...397..445K


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET20:11:54

2003A&A...397..445K - Astronomy and Astrophysics, volume 397, 445-462 (2003/1-2)

XMM-Newton confirmation of soft X-ray excess emission in clusters of galaxies - The discovery of O VII emission from an extended warm baryonic component.

KAASTRA J.S., LIEU R., TAMURA T., PAERELS F.B.S. and DEN HERDER J.W.

Abstract (from CDS):

We investigate a sample of 14 clusters of galaxies observed with XMM-Newton in a search for soft X-ray excess emission. In five of these clusters a significant soft excess is evident. This soft X-ray excess is compared with the thermal emission from both the hot intracluster gas and any cooling (flow) gas that may be present. A warm (kT=0.2keV), extended (several Mpc), plasma component is particularly clear in the outer parts of the cluster, where the normal cluster X-ray emission is weak. This warm component causes both a thermal soft X-ray excess at low energies (below 0.4-0.5keV), as well as OVII line emission with a redshift consistent with a cluster origin, and not easily interpreted as Galactic foreground emission. The intensity of this component is commensurate with what has been measured before with the ROSAT PSPC in the 1/4keV band. We attribute this component to emission from intercluster filaments of the Warm-Hot Intergalactic Medium in the vicinity of these clusters. For the central regions of clusters the detection of lines in the soft X-ray spectrum is more difficult, due to the predominance of the X-ray emitting hot plasma there, hence we cannot discriminate between the thermal and nonthermal origin of the soft excess, leaving several options open. These include thermal emission from warm filaments seen in projection in front of or behind the cluster center, thermal or nonthermal emission in the cluster core itself related to magnetic reconnection, or Inverse Compton emission from the cosmic microwave background on relativistic electrons.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: cooling flows - X-rays: galaxies: clusters

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME NGC 533 Group GrG 01 25 29.1 +01 48 17           ~ 56 0
2 NGC 533 GiG 01 25 31.432 +01 45 33.57   13.1 14.11     ~ 208 0
3 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 659 1
4 ZwCl 0335+0956 ClG 03 38 35.3 +09 57 54           ~ 352 1
5 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 664 2
6 NAME Hya A LIN 09 18 05.651 -12 05 43.99   14.38 14.8     ~ 919 1
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5979 0
8 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6348 3
9 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 730 3
10 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4317 2
11 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1177 0
12 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 634 1
13 NAME BOO SUPERCL SCG 14 01.5 +25 09           ~ 22 1
14 ACO 1837 ClG 14 01 36.2 -11 07 48           ~ 100 0
15 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 687 1
16 NAME NGC 5920 Group ClG 15 21 50.7 +07 42 18     15.13     ~ 291 0
17 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1114 1
18 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1591 1
19 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 236 1
20 ESO 291-9 BiC 23 13 58.630 -42 43 39.31   14.68 14.6 14.537   ~ 49 3
21 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 357 1

    Equat.    Gal    SGal    Ecl

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2021.02.26-20:11:54

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