econstructing orbits of galaxies in extreme regions (ROGER) - II: reliability of projected phase-space in our understanding of galaxy population

Autor(es)

Coenda, Valeria ^{[1, 2]} ; de los Rios, Martin ^{[3, 4, 5, 6]} ; Muriel, Hernan ^{[1, 2]} ; Cora, Sofia A. ^{[7, 8]} ; Martinez, Hector J. ^{[1, 2]} ; Ruiz, Andres N. ^{[1, 2]} ; Vega-Martinez, Cristian A. ^{[9, 10, 11]}

Afiliação do(s) autor(es):Mostrar menos -

^[1] Univ Nacl Cordoba, Observ Astron, Laprida 854, X5000BGR, Cordoba - Argentina

^[2] UNC, CONICET, Inst Astron Teor & Expt CCT Cordoba, Laprida 854, X5000BGR, Cordoba - Argentina

^[3] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid - Spain

^[4] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil

^[5] Univ Estadual Paulista, ICTP South Amer Inst Fundamental Res, BR-01140070 Sao Paulo, SP - Brazil

^[6] Univ Autonoma Madrid, Inst Fis Teor, IFT UAM CSIC, C Nicolas Cabrera 13-15, E-28049 Madrid - Spain

^[7] UNLP, Observ Astron, CONICET, Inst Astrofis La Plata, CCT La Plata, Paseo Bosque S-N, B1900FWA, La Plata - Argentina

^[8] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Observ Astron, Paseo Bosque S-N, BI900FWA, La Plata - Argentina

^[9] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, Raul Bitran 1305, La Serena - Chile

^[10] Univ La Serena, Dept Astron, Av Juan Cisternas 1200 Norte, La Serena - Chile

^[11] Univ La Serena, Dept Astron, Av Juan Cisternas 1200, La Serena - Chile

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 510, n. 2, p. 1934-1944, FEB 2022.
• Citações Web of Science: 0

Resumo

We connect galaxy properties with their orbital classification by analysing a sample of galaxies with stellar mass M-star >= 10(8.5)h(-1) M-circle dot residing in and around massive and isolated galaxy clusters with mass M-200 > 10(15) h(-1)M(circle dot) at redshift z = 0. The galaxy population is generated by applying the semi-analytic model of galaxy formation SAG on the cosmological simulation MultiDark Planck 2. We classify galaxies considering their real orbits (3D) and their projected phase-space position using the ROGER code (2D). We define five categories: cluster galaxies, galaxies that have recently fallen into a cluster, backsplash galaxies, infalling galaxies, and interloper galaxies. For each class, we analyse the(0.1) (g - r) colour, the specific star formation rate (sSFR), and the stellar age, as a function of the stellar mass. For the 3D classes, we find that cluster galaxies have the lowest sSFR, and are the reddest and the oldest, as expected from environmental effects. Backsplash galaxies have properties intermediate between the cluster and recent infaller galaxies. For each 2D class, we find an important contamination by other classes. We find it necessary to separate the galaxy populations in red and blue to perform a more realistic analysis of the 2D data. For the red population, the 2D results are in good agreement with the 3D predictions. Nevertheless, when the blue population is considered, the 2D analysis only provides reliable results for recent infallers, infalling galaxies and interloper galaxies. (AU)

• Processo FAPESP: 19/08852-2 - Técnicas de machine learning aplicadas a problemas cosmológicos
• Beneficiário: Martín Emilio de los Rios
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado