Catálogo de publicaciones - revistas

Compartir en
redes sociales

Título de Acceso Abierto

The Astrophysical Journal (ApJ)

Resumen/Descripción – provisto por la editorial en inglés

The Astrophysical Journal is an open access journal devoted to recent developments, discoveries, and theories in astronomy and astrophysics. Publications in ApJ constitute significant new research that is directly relevant to astrophysical applications, whether based on observational results or on theoretical insights or modeling.

Palabras clave – provistas por la editorial

astronomy; astrophysics

Disponibilidad

Institución detectada	Período	Navegá	Descargá	Solicitá
No detectada	desde jul. 1995 / hasta dic. 2023	IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

0004-637X

ISSN electrónico

1538-4357

Editor responsable

American Astronomical Society (AAS)

Idiomas de la publicación

inglés

País de edición

Reino Unido

Información sobre licencias CC

https://creativecommons.org/licenses/by/4.0/

Cobertura temática

Ciencias físicas

Tabla de contenidos

doi: 10.1088/0004-637x/697/2/1358

LUMINOUS RED GALAXY POPULATION IN CLUSTERS AT 0.2⩽ z ⩽0.6

Shirley Ho; Yen-Ting Lin; David Spergel; Christopher M. Hirata

<jats:title>ABSTRACT</jats:title> <jats:p>We investigate statistical properties of luminous red galaxies (LRGs) in a sample of X-ray-selected galaxy clusters at intermediate redshift (0.2 ⩽ <jats:italic>z</jats:italic> ⩽ 0.6) of mass range from ∼1 × 10<jats:sup>14</jats:sup> <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub> to ∼8 × 10<jats:sup>14</jats:sup> <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub>. The LRGs are selected based on carefully designed color criteria, and the cluster membership is assessed via photometric redshifts. As clusters and LRGs are both viewed as promising tracer of the underlying dark matter distribution, understanding the distribution of LRGs within clusters is an important issue. Our main findings include (1) the halo occupation distribution (HOD) of LRGs inside our cluster sample is 〈<jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>)〉 = <jats:italic>k</jats:italic>(<jats:italic>M</jats:italic>/10<jats:sup>14</jats:sup> <jats:italic>h</jats:italic> <jats:sup>−1</jats:sup> <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub>)<jats:sup> <jats:italic>a</jats:italic> </jats:sup>, where <jats:italic>a</jats:italic> = 0.495 ± 0.105 and <jats:italic>k</jats:italic> = 1.455 ± 0.285 assuming a Poisson distribution for <jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>). If we assume the form of 〈<jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>)〉 = 1 + <jats:italic>k</jats:italic>(<jats:italic>M</jats:italic>/10<jats:sup>14</jats:sup> <jats:italic>h</jats:italic> <jats:sup>−1</jats:sup> <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub>)<jats:sup> <jats:italic>a</jats:italic> </jats:sup>, where <jats:italic>a</jats:italic> = 0.580 ± 0.130 and <jats:italic>k</jats:italic> = 0.975 ± 0.240 assuming a Poisson distribution for <jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>). (2) The HOD of LRGs [<jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>)] and the satellite distribution of LRGs [<jats:italic>N</jats:italic>(<jats:italic>M</jats:italic>) − 1] are both consistent with being Poisson. To be more quantitative, we find Var(<jats:italic>N</jats:italic>)/〈<jats:italic>N</jats:italic>〉 = 1.43 ± 0.35 and Var(<jats:italic>N</jats:italic> − 1)/〈<jats:italic>N</jats:italic> − 1〉 = 1.82 ± 0.50. (3) The radial profile of LRGs within clusters when fitted with a Navarro–Frenk–White profile gives a concentration of 17.5<jats:sup>+7.1</jats:sup> <jats:sub>−4.3</jats:sub> (6.0<jats:sup>+3.2</jats:sup> <jats:sub>−1.9</jats:sub>) including (excluding) brightest LRGs (BLRGs). In essence, the BLRGs are more concentrated toward the center of the clusters than the other LRGs in clusters. We also discuss the implications of these observations on the evolution of massive galaxies in clusters.</jats:p>