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- W3100278246 abstract "Aims. We aim to reveal environmental dependence of infrared luminosity functions (IR LFs) of galaxies at z ~ 0.8 using the AKARIsatellite. AKARI’s wide field of view and unique mid-IR filters help us to construct restframe 8 μm LFs directly without relying onSED models.Methods. We construct restframe 8 μm IR LFs in the cluster region RXJ1716.4+6708 at z = 0.81, and compare them with a blankfield using the AKARI north ecliptic pole deep field data at the same redshift. AKARI’s wide field of view (10' × 10') is suitable toinvestigate wide range of galaxy environments. AKARI’s 15 μm filter is advantageous here since it directly probes restframe 8 μm atz ~ 0.8, without relying on a large extrapolation based on a SED fit, which was the largest uncertainty in previous work.Results. We have found that cluster IR LFs at restframe 8 μm have a factor of 2.4 smaller L^∗ and a steeper faint-end slope than thatof the field. Confirming this trend, we also found that faint-end slopes of the cluster LFs becomes flatter and flatter with decreasinglocal galaxy density. These changes in LFs cannot be explained by a simple infall of field galaxy population into a cluster. Physicsthat can preferentially suppress IR luminous galaxies in high density regions is required to explain the observed results." @default.
- W3100278246 created "2020-11-23" @default.
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- W3100278246 date "2010-05-01" @default.
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- W3100278246 title "Environmental dependence of 8 μm luminosity functions of galaxies at z ~ 0.8 - Comparison between RXJ1716.4+6708 and the AKARI NEP-deep field" @default.
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