J/ApJ/727/14         Merging galaxy cluster A2255 in mid-IR       (Shim+, 2011)
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Merging galaxy cluster A2255 in mid-infrared.
    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.
   <Astrophys. J., 727, 14 (2011)>
   =2011ApJ...727...14S
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ADC_Keywords: Clusters, galaxy ; Galaxies, IR ; Photometry, infrared ;
              Photometry, SDSS ; Redshifts
Keywords: galaxies: clusters: individual (A2255) - galaxies: photometry -
          infrared: galaxies

Abstract:
    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-S11<-1.2) galaxies that are
    quiescent, old (>5Gyr) 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.

Description:
    A2255 is one of the target galaxy clusters for the low-redshift
    CLusters of galaxies EVoLution studies (CLEVL) program (Im et al.
    2008ASPC..399..382I; Lee et al. 2009ASPC..418..241L) and is
    observed by the AKARI InfraRed Camera (IRC) over eight fields (Figure
    1), with each field covering an area of 10x10arcmin^2^.

    A2255 was also observed by Spitzer MIPS 24um and 70um at 5{sigma} flux
    limits of 250uJy and 5mJy, respectively (PID 40562, PI: G. Rieke).

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat    180      426   AKARI IRC 3-24{mu}m, and Spitzer MIPS 24/70{mu}m
                             photometry of Abell 2255 member galaxies
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See also:
   II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
   II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
   J/other/JApA/32.567 : Rotation measures in A2255 at 18, 21, 25, 85cm (Pizzo+
                         2011)
   J/ApJS/149/53 : Multicolor photometry of A2255 galaxies (Yuan+, 2003)
   J/AJ/124/2453 : Spectroscopy of active galaxies in nearby clusters (Miller+,
                   2002)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label    Explanations
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   1-  6  A6    ---     ---     [A2255_]
       7  A1    ---   f_ID      [P/S] P=photometric member or S=spectroscopic
                                member
   8- 25  A18   ---     ID      Galaxy ID (HHMMSS.ss+DDMMSS.s; J2000)
  27- 35  F9.5  deg     RAdeg   Right Ascension in decimal degrees (J2000)
  37- 45  F9.5  deg     DEdeg   Declination in decimal degrees (J2000)
  47- 54  F8.6  ---     z       Redshift (1)
  56- 60  F5.2  mag     umag    ?=99.99 SDSS-DR2 u band AB magnitude (2)
  62- 66  F5.2  mag     gmag    ?=99.99 SDSS-DR2 g band AB magnitude (2)
  68- 72  F5.2  mag     rmag    ?=99.99 SDSS-DR2 r band AB magnitude (2)
  74- 78  F5.2  mag     imag    ?=99.99 SDSS-DR2 i band AB magnitude (2)
  80- 84  F5.2  mag     zmag    ?=99.99 SDSS-DR2 z band AB magnitude (2)
  86- 90  F5.2  mag     N3      ?=99.99 AKARI N3 band AB magnitude (3um) (2)
  92- 96  F5.2  mag   e_N3      ?=99.99 Error in N3 (2)
  98-102  F5.2  mag     N4      ?=99.99 AKARI N4 band AB magnitude (4um) (2)
 104-108  F5.2  mag   e_N4      ?=99.99 Error in N4 (2)
 110-114  F5.2  mag     S7      ?=99.99 AKARI S7 band AB magnitude (7um) (2)
 116-120  F5.2  mag   e_S7      ?=99.99 Error in S7 (2)
 122-126  F5.2  mag     S11     ?=99.99 AKARI S11 band AB magnitude (11um) (2)
 128-132  F5.2  mag   e_S11     ?=99.99 Error in S11 (2)
 134-138  F5.2  mag     L15     ?=99.99 AKARI L15 band AB magnitude (15um) (2)
 140-144  F5.2  mag   e_L15     ?=99.99 Error in L15 (2)
 146-150  F5.2  mag     L24     ?=99.99 AKARI L24 band AB magnitude (24um) (2)
 152-156  F5.2  mag   e_L24     ?=99.99 Error in L24 (2)
 158-162  F5.2  mag     [24]    ?=99.99 Spitzer/MIPS 24 um band AB magnitude (2)
 164-168  F5.2  mag   e_[24]    ?=99.99 Error in [24] (2)
 170-174  F5.2  mag     [70]    ?=99.99 Spitzer/MIPS 70 um band AB magnitude (2)
 176-180  F5.2  mag   e_[70]    ?=99.99 Error in [70] (2)
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Note (1): Redshifts of the spectroscopically selected members ("S") are
     from SDSS DR2 (Abazajian et al. 2004AJ....128..502A), while redshifts
     of the photometrically selected members ("P") are from Yuan, Zhou, &
     Jiang (2003, Cat. J/ApJS/149/53; <[YZJ2003] 4-NNN> or 2-NNN in Simbad).
Note (2): The magnitudes represent total magnitudes of the galaxies. The
     value 99.00 indicates non-detection (below the detection limit- see
     text for details), and 99.99 indicates that the source is either out
     of the field of view in the observation, blended, etc.
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History:
    From electronic version of the journal

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(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    17-Aug-2012