Merging Galaxy Cluster Abell 2255 in Mid-Infrared

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Presentation transcript:

Merging Galaxy Cluster Abell 2255 in Mid-Infrared ( Shim et al. 2011, ApJ, 727, 14 ) Hyunjin Shim KNU SSC M. Im, H. M. Lee, M. G. Lee, S. J. Kim, H. S. Hwang, N. Hwang, J. Ko, J. C. Lee, S. Lim, H. Matsuhara, H. Seo, T. Wada, and T. Goto

Abell 2255, AKARI CLEVL CLEVL – G. H. Lee’s talk Rich galaxy cluster at z=0.081 (c.f. NEP SC – J. Ko) Membership determined based on the SDSS spectroscopy X-ray observation suggests that A2255 is in post-merger stage Rich ancillary data sets in X-ray (ROSAT, XMM-Newton, Chandra), UV (GALEX), optical (SDSS), radio (VLA) Add X-ray plot (Feretti? – Chandra paper.. Contour)

Abell 2255, AKARI CLEVL 10arcmin x 10arcmin x 12 g-r N3-N4 N3-S11 10arcmin x 10arcmin x 12 IRC [N3, N4, S7, S11, L15, L24] Spitzer 24 & 70µm

Origins of MIR-Excess N3-S11 N3-S7 Star formation Dust emission from the circumstellar dust shells around AGB stars AGN N3-S11 Age is a dominant factor that determines MIR-excess N3-S7

Origins of MIR-Excess r<16.5 mag

Substructures and Kinematics Local surface density of galaxies Σ5th Substructures are identified, where local surface density is higher than average.

Substructures and Kinematics A2255 is closely related to NEP Super Cluster (J. Ko’s talk) At <2Mpc, redshift distribution is not single Gaussian. z1=0.077±0.0027 z2=0.082±0.0017 Two components are gravitationally bounded: merging cluster

Environmental Dependence of Star Formation and Galaxy Transformation log SSFR Clustercentric distnce log Σ5th Star formation is NOT enhanced by the environment (e.g., distance from the center, local galaxy surface density)

Environmental Dependence of Star Formation and Galaxy Transformation (Number) fraction of intermediate MIR-excess galaxies Clustercentric distnce log Σ5th No clear evidence that galaxies “in transition” prefer substructures

Conclusion Relative fraction of intermediate MIR-excess galaxies increases at intermediate density region or 0.5<Rcl<2.0 Mpc Cluster-scale merging suppresses the star formation through ram-pressure stripping

spectroscopic redshift catalog AD Available now! AKARI NEP-wide spectroscopic redshift catalog 5.7 deg2 1852 objects (1207 from MMT/Hectospec; 645 from WIYN/Hydra) R<22.5, R<20.5 Will be published soon, Contact hjshim@astro.snu.ac.kr Add IR SFR vs. halpha here?