Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/35365
Title: | Chemical abundances in the outskirts of nearby galaxy groups measured with joint Suzaku and Chandra observations | Authors: | Sarkar, Arnab Su, Yuanyuan Truong, Nhut Randall, Scott Mernier, François GASTALDELLO, FABIO BIFFI, Veronica Kraft, Ralph |
Issue Date: | 2022 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 516 | Issue: | 2 | First Page: | 3068 | Abstract: | We report results from deep Suzaku and mostly snapshot Chandra observations of four nearby galaxy groups: MKW4, Antlia, RXJ1159+5531, and ESO3060170. Their peak temperatures vary over 2-3 keV, making them the smallest systems with gas properties constrained to their viral radii. The average Fe abundance in the outskirts (R > 0.25R200) of their intragroup medium is $Z_{\rm Fe}=0.309\pm 0.018\, Z_\odot$ with χ2 = 14 for 12 degrees of freedom, which is remarkably uniform and strikingly similar to that of massive galaxy clusters, and is fully consistent with the numerical predictions from the IllustrisTNG cosmological simulation. Our results support an early-enrichment scenario among galactic systems over an order of magnitude in mass, even before their formation. When integrated out to R200, we start to see a tension between the measured Fe content in intracluster medium and what is expected from supernovae yields. We further constrain their O, Mg, Si, S, and Ni abundances. The abundance ratios of those elements relative to Fe are consistent with the predictions (if available) from IllustrisTNG. Their Type Ia supernovae fraction varies between 14 per cent and 21 per cent. A pure core-collapsed supernovae enrichment at group outskirts can be ruled out. Their cumulative iron-mass-To-light ratios within R200 are half that of the Perseus cluster, which may imply that galaxy groups do not retain all of their enriched gas due to their shallower gravitational potential wells, or that groups and clusters may have different star formation histories. | URI: | http://hdl.handle.net/20.500.12386/35365 | URL: | https://academic.oup.com/mnras/article/516/2/3068/6679292 https://api.elsevier.com/content/abstract/scopus_id/85149166504 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stac2416 | Bibcode ADS: | 2022MNRAS.516.3068S | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Sarkar2022_stac2416.pdf | Pdf editoriale | 2.13 MB | Adobe PDF | View/Open |
Page view(s)
25
checked on Dec 5, 2024
Download(s)
6
checked on Dec 5, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.