2003A&A...398..435D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET20:22:44

2003A&A...398..435D - Astronomy and Astrophysics, volume 398, 435-440 (2003/2-1)

EUV excess in the inner Virgo cluster.

DE PAOLIS F., INGROSSO G., NUCITA A.A. and ORLANDO D.

Abstract (from CDS):

Observations with the Extreme UltraViolet Explorer (EUVE) satellite have shown that the inner region of the Virgo cluster (centered in M 87 galaxy) has a strong Extreme UltraViolet (EUV) emission (up to 13') in excess to the low-energy tail expected from the hot, diffuse IntraCluster Medium (ICM). Detailed observations of large scale radio emission and upper limits for hard, non-thermal X-ray emission in the 2 - 10 keV energy band have been also reported. Here we show that all available observations can be accounted for by the existence of two electron Populations (indicated as I and II) in the M 87 Galaxy. The mildly relativistic Population I is responsible for the EUV excess emission via IC scattering of CBR and starlight photons. Population II electrons (with higher energy) are instead responsible for the radio emission through synchrotron mechanism. The same electrons also give rise to hard non-thermal X-ray emission (via IC scattering of CBR photons), but the resulting power is always below the upper bounds placed by present observations. The non-negligible energy budget of the two electron populations with respect to that associated with thermal electrons indicates that the M 87 galaxy is not today in a quiescent (relaxed) phase. Nuclear activity and merging processes could have made available this energy budget that today is released in the form of relativistic electrons.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Virgo - radio continuum: galaxies - ultraviolet: galaxies

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5667 0
2 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6045 3
3 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4113 2
4 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1138 0
5 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1086 1
6 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 309 3
7 ACO 4059 ClG 23 56 40.7 -34 40 18           ~ 345 1

    Equat.    Gal    SGal    Ecl

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2019.12.07-20:22:44

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