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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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