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http://hdl.handle.net/20.500.12386/24764
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Buote, David A. | en_US |
dc.contributor.author | Su, Yuanyuan | en_US |
dc.contributor.author | GASTALDELLO, FABIO | en_US |
dc.contributor.author | BRIGHENTI, FABRIZIO | en_US |
dc.date.accessioned | 2020-05-13T07:17:34Z | - |
dc.date.available | 2020-05-13T07:17:34Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/24764 | - |
dc.description.abstract | In this second paper on the entire virial region of the relaxed fossil cluster RXJ 1159+5531, we present a hydrostatic analysis of the azimuthally averaged hot intracluster medium (ICM) using the results of Su et al. For a model consisting of ICM, stellar mass from the central galaxy (BCG), and an NFW dark matter (DM) halo, we obtain a good description of the projected radial profiles of ICM emissivity and temperature that yield precise constraints on the total mass profile. The BCG stellar mass component is clearly detected with a K-band stellar mass-to-light ratio, {M}<SUB>\star </SUB>/{L}<SUB>K</SUB>=0.61+/- 0.11 {M}<SUB>☉ </SUB>/{L}<SUB>☉ </SUB>, consistent with stellar population synthesis models for a Milky Way initial mass function. We obtain a halo concentration, {c}<SUB>200</SUB>=8.4+/- 1.0, and virial mass, {M}<SUB>200</SUB>=(7.9+/- 0.6)× {10}<SUP>13</SUP> {M}<SUB>☉ </SUB>. For its mass, the inferred concentration is larger than most relaxed halos produced in cosmological simulations with Planck parameters, consistent with RXJ 1159+5531 forming earlier than the general halo population. The baryon fraction at r <SUB>200</SUB>, {f}<SUB>{{b,200</SUB>}}=0.134+/- 0.007, is slightly below the Planck value (0.155) for the universe. However, when we take into account the additional stellar baryons associated with non-central galaxies and the uncertain intracluster light (ICL), {f}<SUB>{{b,200</SUB>}} increases by ≈ 0.015, consistent with the cosmic value and therefore no significant baryon loss from the system. The total mass profile is nearly a power law over a large radial range (∼0.2-10 R <SUB> e </SUB>), where the corresponding density slope α obeys the α -{R}<SUB>e</SUB> scaling relation for massive early-type galaxies. Performing our analysis in the context of MOND still requires a large DM fraction (85.0 % +/- 2.5 % at r = 100 kpc) similar to that obtained using the standard Newtonian approach. The detection of a plausible stellar BCG mass component distinct from the NFW DM halo in the total gravitational potential suggests that ∼ {10}<SUP>14</SUP> {M}<SUB>☉ </SUB> represents the mass scale above which dissipation is unimportant in the formation of the central regions of galaxy clusters. | en_US |
dc.language.iso | eng | en_US |
dc.title | The Entire Virial Radius of the Fossil Cluster RXJ 1159 + 5531. II. Dark Matter and Baryon Fraction | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/0004-637X/826/2/146 | en_US |
dc.identifier.scopus | 2-s2.0-84982298907 | en_US |
dc.identifier.isi | 000381977900046 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/0004-637X/826/2/146 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 826 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 146 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016ApJ...826..146B | en_US |
dc.relation.ercsector | Scienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.orcid | 0000-0002-9112-0184 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
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ApJ 2016 Buote.pdf | PDF editoriale | 619.37 kB | Adobe PDF | Visualizza/apri |
1605.02773.pdf | postprint | 384.81 kB | Adobe PDF | Visualizza/apri |
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