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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

DARK MATTER SUBHALOS AND THE X-RAY MORPHOLOGY OF THE COMA CLUSTER

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Autor(es):
Andrade-Santos, Felipe [1, 2] ; Nulsen, Paul E. J. [1] ; Kraft, Ralph P. [1] ; Forman, William R. [1] ; Jones, Christine [1] ; Churazov, Eugene [3] ; Vikhlinin, Alexey [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 - USA
[2] Univ Sao Paulo, Dept Astron IAG, Sao Paulo - Brazil
[3] Max Planck Inst Astrophys, D-85741 Garching - Germany
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 766, n. 2 APR 1 2013.
Citações Web of Science: 14
Resumo

Structure formation models predict that clusters of galaxies contain numerous massive subhalos. The gravity of a subhalo in a cluster compresses the surrounding intracluster gas and enhances its X-ray emission. We present a simple model, which treats subhalos as slow moving and gasless, for computing this effect. Recent weak lensing measurements by Okabe et al. have determined masses of similar to 10(13) M-circle dot for three mass concentrations projected within 300 kpc of the center of the Coma Cluster, two of which are centered on the giant elliptical galaxies NGC 4889 and NGC 4874. Adopting a smooth spheroidal beta-model for the gas distribution in the unperturbed cluster, we model the effect of these subhalos on the X-ray morphology of the Coma Cluster, comparing our results to Chandra and XMM-Newton X-ray data. The agreement between the models and the X-ray morphology of the central Coma Cluster is striking. With subhalo parameters from the lensing measurements, the distances of the three subhalos from the Coma Cluster midplane along our line of sight are all tightly constrained. Using the model to fit the subhalo masses for NGC 4889 and NGC 4874 gives 9.1 x 10(12) M-circle dot and 7.6 x 10(12) M-circle dot, respectively, in good agreement with the lensing masses. These results lend strong support to the argument that NGC 4889 and NGC 4874 are each associated with a subhalo that resides near the center of the Coma Cluster. In addition to constraining the masses and 3-d location of subhalos, the X-ray data show promise as a means of probing the structure of central subhalos. (AU)

Processo FAPESP: 08/05970-0 - Colisões de aglomerados de galáxias e suas consequências astrofísicas
Beneficiário:Felipe Andrade Santos
Linha de fomento: Bolsas no Brasil - Doutorado