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http://hdl.handle.net/20.500.12386/29736
Title: | Testing the rotation versus merger scenario in the galaxy cluster Abell 2107 | Authors: | LIU, ANG TOZZI, Paolo |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 485 | Issue: | 3 | First Page: | 3909 | Abstract: | We search for global rotation of the intracluster medium in the galaxy cluster Abell 2107, where previous studies have detected rotational motion in the member galaxies with a high-significance level. By fitting the centroid of the iron K<SUB>α</SUB> line complex at 6.7-6.9 keV rest frame in Chandra ACIS-I spectra, we identify the possible rotation axis with the line that maximizes the difference between the emission-weighted spectroscopic redshift measured in the two halves defined by the line itself. Then, we measure the emission-weighted redshift in linear regions parallel to the preferred rotation axis, and find a significant gradient as a function of the projected distance from the rotation axis, compatible with a rotation pattern with maximum tangential velocity {v}_max=1380± 600 km s<SUP>-1</SUP> at a radius λ<SUB>0</SUB> ∼ 160 kpc. This result, if interpreted in the framework of hydrostatic equilibrium, as suggested by the regular morphology of Abell 2107, would imply a large mass correction of the order of ∆ M = (6 ± 4)× 10^{13} M_☉ at ∼160 kpc, which is incompatible with the cluster morphology itself. A more conservative interpretation may be provided by an unnoticed off-centre, head-on collision between two comparable haloes. Our analysis confirms the peculiar dynamical nature of the otherwise regular cluster Abell 2107, but is not able to resolve the rotation versus merger scenario, a science case that can be addressed by the next-generation X-ray facilities carrying X-ray bolometers on board. | URI: | http://hdl.handle.net/20.500.12386/29736 | URL: | https://academic.oup.com/mnras/article-abstract/485/3/3909/5376510 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz713 | Bibcode ADS: | 2019MNRAS.485.3909L | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stz713.pdf | PDF editoriale | 6.9 MB | Adobe PDF | View/Open |
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