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http://hdl.handle.net/20.500.12386/24763
Titolo: | Chandra Observation of Abell 1142: A Cool-core Cluster Lacking a Central Brightest Cluster Galaxy? | Autori: | Su, Yuanyuan Buote, David A. GASTALDELLO, FABIO van Weeren, Reinout |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 821 | Fascicolo: | 1 | Da pagina:: | 40 | Abstract: | Abell 1142 is a low-mass galaxy cluster at low redshift containing two comparable brightest cluster galaxies (BCGs) resembling a scaled-down version of the Coma Cluster. Our Chandra analysis reveals an X-ray emission peak, roughly 100 kpc away from either BCG, which we identify as the cluster center. The emission center manifests itself as a second beta-model surface brightness component distinct from that of the cluster on larger scales. The center is also substantially cooler and more metal-rich than the surrounding intracluster medium (ICM), which makes Abell 1142 appear to be a cool-core cluster. The redshift distribution of its member galaxies indicates that Abell 1142 may contain two subclusters, each of which contain one BCG. The BCGs are merging at a relative velocity of ≈1200 km s<SUP>-1</SUP>. This ongoing merger may have shock-heated the ICM from ≈2 keV to above 3 keV, which would explain the anomalous L<SUB>X</SUB>-T<SUB>X</SUB> scaling relation for this system. This merger may have displaced the metal-enriched “cool core” of either of the subclusters from the BCG. The southern BCG consists of three individual galaxies residing within a radius of 5 kpc in projection. These galaxies should rapidly sink into the subcluster center due to the dynamical friction of a cuspy cold dark matter halo. | URI: | http://hdl.handle.net/20.500.12386/24763 | URL: | https://iopscience.iop.org/article/10.3847/0004-637X/821/1/40 | ISSN: | 0004-637X | DOI: | 10.3847/0004-637X/821/1/40 | Bibcode ADS: | 2016ApJ...821...40S | Fulltext: | open |
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ApJ 2016 Su.pdf | PDF editoriale | 1.84 MB | Adobe PDF | Visualizza/apri |
1602.06549.pdf | postprint | 1.33 MB | Adobe PDF | Visualizza/apri |
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