AKARI Observation of North Ecliptic Pole Supercluster at z=0.087

Details AKARI Observation of North Ecliptic Pole Supercluster at z=0.087 AKARI Observation of North Ecliptic Pole Supercluster at z=0.087

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743033k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #430.33; Bulletin of the American Astronomical Society, Vol. 43, 2011

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We present the mid-infrared (mid-IR) properties and environments of red-sequence galaxies within a supercluster in North Ecliptic Pole (NEP) area at redshift 0.087, using AKARI NEP-Wide (5.8 deg2) IR imaging survey in conjunction with ultraviolet-near-IR spectral energy distributions (SEDs). The supercluster sample is based on our follow-up optical spectroscopy within 0.07 < z < 0.10, and is limited to galaxies with M* 109.5 M[solar]. We present mid-IR SEDs of red-sequence galaxies thanks to the continuous coverage in mid-IR (7-18 μm) of the AKARI. Most importantly, such mid-IR flux allows us to trace not only star formation rate (SFR), but also the presence of intermediate age populations showing excess emission over the stellar light in mid-IR. As such, we find that the red-sequence samples do not only contain passively evolving red early-type galaxies, but also contaminated with: 1) disk-dominated star-forming galaxies which have SFRs per unit stellar mass lower than blue-cloud galaxies, and 2) early-type galaxies showing broad non-stellar emission in mid-IR compared to normal red early-type galaxies. Those two populations may represent transition objects between blue spiral galaxies and red early-type galaxies. We present how those two transition galaxies depend on their local density and stellar mass, and discuss which factor is the primary predictor of star formation activity and the morphological transformation.

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