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J/AJ/127/660   Photometry in southern tail of the Antennae      (Saviane+, 2004)
The stellar content of the southern tail of NGC 4038/4039 and a revised distance
    Saviane I., Hibbard J.E., Rich R.M.
   <Astron. J., 127, 660-678 (2004)>
   =2004AJ....127..660S
ADC_Keywords: Galaxies, photometry ; Associations, stellar ; Photometry, VRI

Keywords: galaxies: distances and redshifts -
          galaxies: individual: NGC 4038, NGC 4039 - galaxies: interactions -
          galaxies: peculiar - galaxies: stellar content

Abstract:
    We have used the Hubble Space Telescope and Wide Field Planetary
    Camera 2 to image the putative tidal dwarf galaxy located at the tip
    of the Southern tidal tail of NGC 4038/4039, the Antennae. We resolve
    individual stars and identify two stellar populations. Hundreds of
    massive stars are present, concentrated into tight OB associations on
    scales of 200pc, with ages ranging from 2 to 100Myr. An older stellar
    population is distributed roughly following the outer contours of the
    neutral hydrogen in the tidal tail; we associate these stars with
    material ejected from the outer disks of the two spirals. The older
    stellar population has a red giant branch tip at I=26.5±0.2 from
    which we derive a distance modulus (m-M)0=30.7±0.25. The implied
    distance of 13.8±1.7Mpc is significantly smaller than commonly
    quoted distances for NGC 4038/4039. In contrast to the previously
    studied core of the merger, we find no superstar clusters (SSCs).

Description:
    The field centered at
    (RA, DE, epoch) = (12 01 25.6, -19 00 31.9; J2000.0)
    was imaged on 1998 November 23 and 24 and 1999 January 4 and 5.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        72     4093   Photometry of individual stars
table2.dat        68        8   Photometric properties of the eight associations


See also:
 J/AJ/109/960   : Young star clusters in The Antennae (Whitmore+ 1995)
 J/ApJ/561/727  : BVI photometry in the Antennae galaxies (Zhang+, 2001)
 J/ApJ/599/1049 : Supergiant molecular complexes in the Antennae (Wilson+, 2003)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label       Explanations

   1-  4  I4    ---     [SHR2004]   Stellar identification number,
                                    [SHR2004] Star NNN in Simbad
   6-  7  I2    h       RAh         Hour of right ascension (J2000)
   9- 10  I2    min     RAm         Minute of right ascension (J2000)
  12- 17  F6.3  s       RAs         Second of right ascension (J2000)
      19  A1    ---     DE-         Sign of the declination (J2000)
  20- 21  I2    deg     DEd         Degree of declination (J2000)
  23- 24  I2    arcmin  DEm         Arcminute of declination (J2000)
  26- 30  F5.2  arcsec  DEs         Arcsecond of declination (J2000)
  32- 37  F6.3  mag     Vmag        True Johnson V-band magnitude
  39- 44  F6.3  mag     F555Wmag    True HST F555W-band magnitude
  46- 50  F5.3  mag     e_F555Wmag  Photometric error in F555Wmag
  52- 57  F6.3  mag     V-Ic        The Johnson V-I (Cousins) color
  59- 64  F6.3  mag    F555W-F814W  HST F555W-F814W color
  66- 70  F5.3  mag  e_F555W-F814W  Photometric error in F555W-F814W
      72  I1    ---     Chip        The WFPC2 chip identification number


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

   Bytes Format Units  Label     Explanations

       1  I1    ---   [SHR2004]  Sequential number of the region,
                                [SHR2004] Assoc N in Simbad
   3-  5  A3    ---    [MLD92]   Mirabel et al. (1992A&A...256L..19M) designation
   8-  9  I2    h      RAh       Right ascension (J2000.0)
  11- 12  I2    min    RAm       Right ascension (J2000.0)
  14- 18  F5.2  s      RAs       Right ascension (J2000.0)
      20  A1    ---    DE-       Declination sign (J2000.0)
  21- 22  I2    deg    DEd       Declination (J2000.0)
  24- 25  I2    arcmin DEm       Declination (J2000.0)
  27- 31  F5.2  arcsec DEs       Declination (J2000.0)
  33- 34  I2    ---    NBlue     Number of blue stars ((V-I)0≤0.5)
  36- 37  I2    ---    NTot      Total number of stars
  39- 42  F4.1  mag    IcMAGB    Absolute Cousins I magnitude for blue stars (1)
  44- 47  F4.1  mag    VMAGB     Absolute V magnitude for blue stars (1)
  49- 52  F4.1  mag    (V-Ic)0B  Dereddened V-I Cousins colour for blue stars
  54- 58  F5.1  mag    IcMAGT    Absolute Cousins I magnitude for all stars (1)
  60- 64  F5.1  mag    VMAGT     Absolute V magnitude for all stars (1)
  66- 68  F3.1  mag    (V-Ic)0T  Dereddened V-I Cousins colour for all stars

Note (1): The absolute magnitudes have been computed assuming the
    Whitmore et al. (1999AJ....118.1551W) distance modulus (m-M)0=31.4.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    02-Jul-2004