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J/MNRAS/318/703                H-alpha in Abell 2390             (Balogh+ 2000)
H-alpha photometry of Abell 2390
    Balogh M.L., Morris S.L.
   <Mon. Not. R. Astron. Soc. 318, 703 (2000)>
   =2000MNRAS.318..703B
ADC_Keywords: Clusters, galaxy; Photometry, H-alpha

Keywords: galaxies: clusters: Abell 2390 - galaxies : evolution


Description:
    Photometry is tabulated for 1189 galaxies in 19 OSIS-V (CFHT) images
    in the direction of the galaxy cluster Abell 2390. The images cover
    270 sq. deg., and extend out to the virial radius of the cluster.
    Three narrow filters are used to determine the flux above the
    continuum between wavelengths 7897 and 8245 Å, corresponding to
    H-alpha at 0.2033<z<0.2563. The absolute flux values are uncertain by
    about 30% due to zero point uncertainty; we also tabulate the
    equivalent width which is independent of this zero point. Only strong
    emission line cluster members (equivalent width greater than about
    50Å) are detectable, by design. Galaxies with spectra available
    from the CNOC survey (Abraham=1996ApJ...471..694A) are identified.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       116     1189   H-alpha Catalogue


Byte-by-byte Description of file: table2.dat

   Bytes Format  Units  Label   Explanations

   1-  3  A3     ---    Name    Name of field used for the photometry
   5- 10  F6.1   pix    Xpos    X coordinate on CCD
  12- 17  F6.1   pix    Ypos    Y coordinate on CCD
  19- 27  F9.5   deg    RAdeg   Right ascension J2000
  29- 36  F8.5   deg    DEdeg   Declination J2000
  38- 44  F7.1   arcsec dRA     J2000 R.A. difference from BCG (1)
  46- 51  F6.1   arcsec dDE     J2000 Dec. difference from BCG (1)
  53- 58  F6.3   mag    rmag    Gunn R magnitude
  60- 64  F5.3   mag    e_rmag  Uncertainty in R
  66- 71  F6.3   mag    Rcorr   Corrected R magnitude (2)
  73- 79  F7.4   Jy     flux    H-alpha flux (3)
  81- 86  F6.4   Jy     e_flux  Uncertainty in flux
  88- 93  F6.1   0.1nm  EW      H-alpha equivalent width (3)
  95- 98  F4.1   0.1nm  e_EW    Uncertainty in EW
     100  I1     ---    flag    [0,3] SExtractor Photometry flag (4)
 102-105  F4.2   mag    Wcor    Incompleteness magnitude correction
 107-112  I6     ---    ppp     ? Galaxy number in Abraham
                                    =1996ApJ...471..694A
 114-116  A3     ---    CM      ? Cluster membership

Note (1):
    BCG position is 21:53:36.8, +17:41:43.8 (J2000)
Note (2):
    Zero point corrected by bootstrapping to CNOC photometry
    (=1996ApJ...471..694A)
Note (3):
    Flux and equivalent width only correspond to Halpha for
    galaxies with redshifts between 0.2033 and 0.2563.
Note (4): the SEXTACTOR photometry flag indicates the presence
    of bright neighbours (1), a deblended object (2), both (3)
    or neither (0).


References:
    Abraham R. G., Smecker-Hane T. A., Hutchings J. B.,
     Carlberg R. G., Yee H. K. C., Erica E., Morris S. L.,
     Oke J. B., Rigler M. 1996, ApJ 471, 694 =1996ApJ...471..694A
(End)      M.L. Balogh [Durham], Gail L. Schneider [SSDOO/ADC]       25-Oct-2000