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Date and Time of the Query: 2019-07-22 T03:50:32 PDT
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For refcode 2014MNRAS.438.2565S:
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Copyright by Royal Astronomical Society. 2014MNRAS.438.2565S Star formation in the cluster CLG0218.3-0510 at z = 1.62 and its large-scale environment: the infrared perspective Santos, J. S.; Altieri, B.; Tanaka, M.; Valtchanov, I.; Saintonge, A.; Dickinson, M.; Foucaud, S.; Kodama, T.; Rawle, T. D.; Tadaki, K. Abstract. The galaxy cluster CLG0218.3-0510 at z = 1.62 is one of the most distant galaxy clusters known, with a rich multiwavelength data set that confirms a mature galaxy population already in place. Using very deep, wide-area (20 Mpc x 20 Mpc) imaging by Spitzer MIPS at 24 micron, in conjunction with Herschel five-band imaging from 100 to 500 micron, we investigate the dust-obscured, star formation properties in the cluster and its associated large-scale environment. Our galaxy sample of 693 galaxies at z ~ 1.62 detected at 24 micron (10 spectroscopic and 683 photo-z) includes both cluster galaxies (i.e. within r < 1 Mpc projected cluster-centric radius) and field galaxies, defined as the region beyond a radius of 3 Mpc. The star formation rates (SFRs) derived from the measured infrared luminosity range from 18 to 2500 M_sun_ yr^-1^, with a median of 55 M_sun_ yr^-1^, over the entire radial range (10 Mpc). The cluster's brightest far-infrared galaxy, taken as the centre of the galaxy system, is vigorously forming stars at a rate of 256 +/- 70 M_sun_ yr^-1^, and the total cluster SFR enclosed in a circle of 1 Mpc is 1161 +/- 96 M_sun_ yr^-1^. We estimate a dust extinction of ~3 mag by comparing the SFRs derived from [O II] luminosity with the ones computed from the 24 micron fluxes. We find that the in-falling region (1-3 Mpc) is special: there is a significant decrement (3.5x) of passive relative to star-forming galaxies in this region, and the total SFR of the galaxies located in this region is lower (~130 M_sun_ yr^-1^ Mpc^-2^) than anywhere in the cluster or field, regardless of their stellar mass. In a complementary approach, we compute the local galaxy density, Sigma_5_, and find no trend between SFR and Sigma_5_. However, we measure an excess of star-forming galaxies in the cluster relative to the field by a factor of 1.7, that lends support to a reversal of SF-density relation in CLG0218. Key words: galaxies: clusters: individual: CLG0218.3-0510, galaxies: high-redshift, galaxies: star formation, infrared: galaxies
Retrieve 43 NED objects in this reference.
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