Merging galaxy cluster A2255 in mid-IR

DOI

We present the mid-infrared (MIR) observation of a nearby galaxy cluster, A2255, by the AKARI space telescope. Using AKARI's continuous wavelength coverage between 3 and 24um and the wide field of view, we investigate the properties of cluster member galaxies to see how the infall of the galaxies, the cluster substructures, and the cluster-cluster merger influence their evolution. We show that the excess of MIR (~11um) flux is a good indicator for discriminating galaxies at different evolutionary stages and for dividing galaxies into three classes accordingly: strong MIR-excess (N3-S11>0.2) galaxies that include both unobscured and obscured star-forming galaxies; weak MIR-excess (-2.0<N3-S115Gyr) galaxies where the MIR emission arises mainly from the circumstellar dust around AGB stars; and intermediate MIR-excess (-1.2<N3-S11<0.2) galaxies in between the two classes that are less than a few Gyr old past the prime star formation activity. With the MIR-excess diagnostics, we investigate how local and cluster-scale environments affect the individual galaxies. We derive the total star formation rate (SFR) and the specific SFR of A2255 using the strong MIR-excess galaxies.

Cone search capability for table J/ApJ/727/14/table2 (AKARI IRC 3-24{mu}m, and Spitzer MIPS 24/70{mu}m photometry of Abell 2255 member galaxies)

Identifier
DOI http://doi.org/10.26093/cds/vizier.17270014
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/727/14
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/727/14
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/727/14
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/727/14
Provenance
Creator Shim H.; Im M.; Lee H.M.; Lee M.G.; Kim S.J.; Hwang H.S.; Hwang N.; Ko J.,Lee J.C.; Lim S.; Matsuhara H.; Seo H.; Wada T.; Goto T.
Publisher CDS
Publication Year 2012
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Cosmology; Galactic and extragalactic Astronomy; Natural Sciences; Observational Astronomy; Physics