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http://hdl.handle.net/20.500.12386/28988
Titolo: | Disturbed Fossil Group Galaxy NGC 1132 | Autori: | Kim, Dong-Woo Anderson, Craig Burke, Doug Fabbiano, Giuseppina FRUSCIONE, ANTONELLA Lauer, Jen McCollough, Michael Morgan, Doug Mossman, Amy O’Sullivan, Ewan PAGGI, Alessandro Vrtilek, Saeqa TRINCHIERI, Ginevra |
Data pubblicazione: | 2018 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 853 | Fascicolo: | 2 | Da pagina:: | 129 | Abstract: | We have analyzed the Chandra archival data of NGC 1132, a well-known fossil group, i.e., a system expected to be old and relaxed long after the giant elliptical galaxy assembly. Instead, the Chandra data reveal that the hot gas morphology is disturbed and asymmetrical, with a cold front following a possible bow shock. We discuss possible origins of the disturbed hot halo, including sloshing by a nearby object, merger, ram pressure by external hotter gas, and nuclear outburst. We consider that the first two mechanisms are likely explanations for the disturbed hot halo, with a slight preference for a minor merger with a low impact parameter because of the match with simulations and previous optical observations. In this case, NGC 1132 may be a rare example of unusual late mergers seen in recent simulations. Regardless of the origin of the disturbed hot halo, the paradigm of the fossil system needs to be reconsidered. | URI: | http://hdl.handle.net/20.500.12386/28988 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aaa43a | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aaa43a | Bibcode ADS: | 2018ApJ...853..129K | Fulltext: | open |
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