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ClG 0217+70: A massive merging galaxy cluster with a large radio halo and relics.
- Source :
-
Astronomy & Astrophysics / Astronomie et Astrophysique . Oct2020, Vol. 642, p1-5. 5p. - Publication Year :
- 2020
-
Abstract
- We present an analysis of archival Chandra data of the merging galaxy cluster ClG 0217+70. The Fe XXV Heα X-ray emission line is clearly visible in the 25 ks observation, allowing a precise determination of the redshift of the cluster as z = 0.180 ± 0.006. We measure kT500 = 8.3 ± 0.4 keV and estimate M500 = (1.06 ± 0.11) × 1015 M⊙ based on existing scaling relations. Correcting both the radio and X-ray luminosities with the revised redshift reported here, which is much larger than previously inferred based on sparse optical data, this object is no longer an X-ray underluminous outlier in the LX − Pradio scaling relation. The new redshift also means that, in terms of physical scale, ClG 0217+70 hosts one of the largest radio halos and one of the largest radio relics known to date. Most of the relic candidates lie in projection beyond r200. The X-ray morphological parameters suggest that the intracluster medium is still dynamically disturbed. Two X-ray surface brightness discontinuities are confirmed in the northern and southern parts of the cluster, with density jumps of 1.40 ± 0.16 and 3.0 ± 0.6, respectively. We also find a 700 × 200 kpc X-ray faint channel in the western part of the cluster, which may correspond to compressed heated gas or increased non-thermal pressure due to turbulence or magnetic fields. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GALAXY clusters
*COMPRESSED gas
*MAGNETIC fields
*RELICS
*RADIOS
*REDSHIFT
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Volume :
- 642
- Database :
- Academic Search Index
- Journal :
- Astronomy & Astrophysics / Astronomie et Astrophysique
- Publication Type :
- Academic Journal
- Accession number :
- 148681225
- Full Text :
- https://doi.org/10.1051/0004-6361/202039028