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J/ApJ/604/141     Hα fluxes in Cl J0023+0423B galaxies       (Finn+, 2004)
Hα-derived star formation rates for the z=0.84 galaxy cluster
Cl J0023+0423B.
    Finn R.A., Zaritsky D., Mccarthy D.W.Jr
   <Astrophys. J., 604, 141-152 (2004)>
   =2004ApJ...604..141F
ADC_Keywords: Clusters, galaxy ; Redshifts ; Equivalent widths

Keywords: galaxies: clusters: individual (Cl J0023+0423B) -
          galaxies: evolution - galaxies: high-redshift - stars: formation

Abstract:
    We present Hα-derived star formation rates (SFRs) for the galaxy
    cluster Cl J0023+0423B at z=0.845. Our 3σ flux limits correspond
    to an SFR of 0.24h100-2M☉/yr, and our minimum reliable
    Hα+[NII] equivalent width is greater than 10Å, demonstrating
    that near-infrared narrow-band imaging can sample the star-forming
    galaxy population in distant clusters. Comparison with spectroscopy
    shows that the number of false detections is low (9%±6%) and that
    our Hα equivalent widths are correlated with spectroscopically
    determined [O II] equivalent widths. A magnitude-limited spectroscopic
    survey conducted over the same area missed 70% of the star-forming
    galaxies and 65% of the integrated star formation. Using Hubble Space
    Telescope Wide Field Planetary Camera 2 Archive images, we fit Sersic
    profiles to all galaxies with significant narrow-band equivalent widths
    and find that equivalent width decreases as the steepness of galaxy
    profile increases.

Description:
    We observed Cl J0023+0423B using the PISCES near-infrared camera at
    the 6.5m MMT on 2002 December 19 equipped with a standard J continuum
    narrow-band filter (λc=1.208µm).
Objects:
    -----------------------------------------
       RA   (2000)   DE     Designation(s)
    -----------------------------------------
    00 23 52      +04 23.1  ClG J0023+0423
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       123       94   Data for CL J0023+0423B galaxies


See also:
   J/AJ/116/560 : Cl J0023+0423 and Cl J1604+4304 spectroscopy (Postman+ 1998)
   J/AJ/116/584 : Cl J0023+0423 and Cl J1604+4304 morphology (Lubin+ 1998)


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

   Bytes Format Units       Label   Explanations

   1-  2  I2    ---      [FZM2004]  Object designation
   4-  8  F5.1  arcsec      oRA     Right Ascension offset from BCG
  10- 14  F5.1  arcsec      oDE     Declination offset from BCG
  16- 20  F5.1  pix         Xpos    X pixel coordinates (1)
  22- 26  F5.1  pix         Ypos    Y pixel coordinates (1)
  28- 31  F4.1  s-1         FNar    Narrow-band flux, in units of ADU/s
  33- 35  F3.1  s-1         e_FNar  Uncertainty in FNar
  37- 41  F5.1  s-1         FJ      The J band flux, in units of ADU/s
  43- 45  F3.1  s-1         e_FJ    Uncertainty in FJ
  47- 50  F4.1  s-1         FCS     Continuum-subtracted flux,
                                     in units of ADU/s
  52- 54  F3.1  s-1         e_FCS   Uncertainty in FCS
  56- 60  F5.1  0.1nm       EWNar   Narrow-band equivalent width in Angstroms
  62- 66  F5.1  0.1nm      e_EWNar  Uncertainty in EWNar
  68- 73  F6.2  10-20W/m2   FHa     Hα flux in 10-17ergs/s/cm2
  75- 78  F4.2  10-20W/m2   e_FHa   Uncertainty in FHa
  80- 83  F4.1  10+34W      LHa     Hαluminosity in 1041erg/s
  85- 87  F3.1  10+34W      e_LHa   Uncertainty in LHa
  89- 92  F4.1  solMass/yr  SFR     Star formation rate in h1002M☉/yr
  94- 96  F3.1  solMass/yr  e_SFR   Uncertainty in SFR
  98-100  I3    ---         MDS     ? Lubin et al. name (1998 Cat. J/AJ/116/584)
                                      [OPL98] MDS J0023+0423 NNN in Simbad
 102-107  F6.4  ---         z       ? Redshift from Postman et al. (1998, 
                                      Cat. J/AJ/116/560)
 109-112  F4.1  ---         TType   ? Morphological type from Lubin et al.
                                      (1998, Cat. J/AJ/116/584) (2)
 114-118  F5.2  ---         n       ? Sersic index
 120-123  F4.2  ---         e_n     ? Uncertainty in n

Note (1): 1 pix = 0.18". East is up, North is right.

Note (2):
    Where E = 0, S0 = 0.1, Sa = 1, Sb = 3, Sc = 5, Sd = 7, Sm/Im = 9,
    Peculiar = 10. We denote galaxies that Lubin et al. (1998, Cat.
    J/AJ/116/584) classify as extremely compact with a T-type of -1 
    and peculiar with 10.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    07-May-2004