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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 A and 8245 A, 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 50 A) 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    R        Gunn-R magnitude
  60- 64   F5.3     mag    e_R      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     SExtractor Photometry flag
 102-105   F4.2     ---    Wcor     Incompleteness 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.

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