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J/AJ/108/1987                 The SSRS2 Sample                    (Alonso+ 1994)
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CCD Calibration of the Magnitude Scale for the SSRS2 Sample:
The Equatorial Region
    Alonso M.V., da Costa L.N., Latham D.W., Pellegrini P.S., Milone A.A.E.
   <Astron. J. 108, 1987 (1994)>
   =1994AJ....108.1987A
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ADC_Keywords: Galaxies, optical; Galactic pole, north; Galactic pole, south; 
              Photometry, CCD; Magnitudes

Abstract:
  In this paper we continue our investigation on the isophotal nature,
  accuracy, and uniformity of the magnitude system adopted in the
  Southern Sky Redshift Survey extension (SSRS2).  Extending our earlier
  work, we examine galaxies in the equatorial region, primarily in the
  declination range -17.5 deg <= Dec. <= 0 deg, over a large range of
  right ascension, covering the southern and northern Galactic caps.  For
  this purpose, we have obtained CCD isophotal magnitudes in the B and R
  bands for 265 galaxies of different morphological types.  Using this
  larger sample we confirm our earlier claim that the m(SSRS2) magnitudes
  are very nearly the magnitude measured within the isophote mu_B = 26
  mag/arcsec^2, with a dispersion of about 0.30 mag.  The relative
  zero-point offset between our m(SSRS2) magnitudes and CCD photometry is
  -0.02 mag from all data we have obtained.  However, we detect a
  variation of the zero-point across different regions of the sky of +/-
  0.10 mag for regions at large angular separations.  We also estimate
  that the zero-point offset between the m(SSRS2) and Zwicky systems is
  relatively small (~0.10 mag), which should allow us to combine the data
  from the SSRS2 and the CfA2 Redshift Survey.


File Summary:
--------------------------------------------------------------------------------
 FileName    Lrecl    Records   Explanations
--------------------------------------------------------------------------------
ReadMe          80          .   This file
table1.dat      63        265   Galaxy sample
notes1.dat      79         90   Notes to table 1
table2.dat      56        238   Isophotal magnitudes for observed galaxies
table1.tex      86        543   TeX version of Table 1 and notes
table2.tex     108        417   TeX version of Table 2
useful.tex      78         42   Macro package required by TeX files
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units    Label    Explanations
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   1-12   A12     ---     Galaxy   Name of the galaxy
  13-21   A9      ---     StScI    Space Telescope Science Institute Id.
  22-24   I3      h       RAh      Right ascension 1950.0
  25-27   I3      min     RAm      R.A.
  28-32   F5.1    s       RAs      R.A.
  34      A1      ---     DE-      Sign declination
  35-36   I2      deg     DEd      Declination 1950.0
  37-39   I3      arcmin  DEm      Dec.
  40-42   I3      arcsec  DEs      Dec.
  43-46   I4      ---     Type     []? Morph. type, Corwin 1993, private comm.
  47-53   F7.2    mag     mSSRS2   []? SSRS2 magnitude
  54-59   F6.1    mag     mMCG     []? Morphological Cat. of Galaxies magnitude
  61-63   A3      ---     Note    *Note flags
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Note on Note:
  1 - Galaxies in common with ESO-LV.
  2 - Galaxies in common with CGCG.
  3 - Surface brightness profiles used in the comparisons with
      other authors.
  * - Comments on Individual Galaxies (see notes1.dat)
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Byte-by-byte Description of file: notes1.dat
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   Bytes Format  Units   Label     Explanations
--------------------------------------------------------------------------------
   1-80   A80    ---     Note      Text of note for object marked with '*' in
                                     field 'Note' in table1.dat
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Byte-by-byte Description of file: table2.dat
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   Bytes Format  Units    Label      Explanations
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   1-12   A12     ---     Galaxy     Name of the galaxy
  14-18   A5      ---     Date       Observation date
  19-25   F7.2    mag     mB26      *CCD magnitude m_B(26)
  26-30   F5.2    mag     e_mB26     Associated error in mB26
  31-37   F7.2    mag     mR26      *CCD magnitude m_R(26)
  38-42   F5.2    mag     e_mR26     Associated error in mR26
  43-49   F7.2    ---     muBlim     Limiting blue isophote, mu_{B,lim}
  50-56   F7.2    ---     muRlim     Limiting red isophote, mu_{R,lim}
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Note on mB26:
  CCD magnitude m_B(26) as measured within (or extrapolated to) the
  isophote mu_B = 26 mag/arcsec^2
Note on mR26:
  CCD magnitude m_R(26) as extrapolated to the isophote
  mu_R = 26 mag/arcsec^2
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Origin: AAS CD-ROM series, Volume 4, 1995         Lee Brotzman [ADS] 05-May-1995
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(End)                                                         [CDS]  10-Jul-1995