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J/AJ/131/866       Hot populations in M87 globular clusters        (Sohn+, 2006)
Hot populations in M87 globular clusters.
    Sohn S.T., O'Connell R.W., Kundu A., Landsman W.B., Burstein D.,
    Bohlin R.C., Frogel J.A., Rose J.A.
   <Astron. J., 131, 866-888 (2006)>
   =2006AJ....131..866S
ADC_Keywords: Galaxies, UV-excess ; Clusters, globular ; Photometry, ultraviolet

Keywords: galaxies: individual (M87) - galaxies: star clusters -
          globular clusters: general - ultraviolet: galaxies

Abstract:
    To explore the production of UV-bright stars in old, metal-rich
    populations like those in elliptical galaxies, we have obtained Hubble
    Space Telescope (HST) Space Telescope Imaging Spectrograph far- and
    near-UV photometry of globular clusters (GCs) in four fields in the
    giant elliptical (gE) galaxy M87. To a limit of mFUV∼25 we detect a
    total of 66 GCs in common with the deep HST optical-band study of
    Kundu et al. (1999, Cat. J/ApJ/513/733).

Description:
    The data used in this study consist of HST STIS (Space Telescope
    Imaging Spectrograph) FUV (1270-2000Å, pivot wavelength 1460Å)
    and NUV (1480-3500Å, pivot wavelength 2360Å) images of four
    different fields in the inner (r<1.5') region of M87. Fields 1, 2, and
    3 were observed with the HST STIS far-UV camera in HST program GO-8643
    (PI: R. O'Connell). We also obtained three optical band images
    centered on the same positions as the far-UV frames of fields 1, 2,
    and 3, using the STIS CCD and F28X50LP filter (5500-11000Å, pivot
    wavelength 7230Å). Observations of field 4 were taken from the
    Space Telescope Science Institute (STScI) HST archive.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        88       22   Photometry of NUV-only sources in Field 4
table4.dat        65      146   Photometric catalog for Field 1, 2, and 3
table5.dat        88       16   Photometric catalog for Field 4
table6.dat        84       31   UV data for Milky Way globular clusters


See also:
  J/ApJ/513/733 : Globular cluster system in M87 (Kundu+, 1999)
  J/AJ/106/493  : Globular clusters in M87 (Lee+, 1993)
  J/AJ/115/1801 : VRI photometry of M87 globular clusters (Harris+ 1998)
  J/ApJS/73/671 : M87 globular clusters BVI photometry (Couture+, 1990)


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

   Bytes Format Units    Label     Explanations

   1-  4  A4    ---      ---       [NUV-]
   5-  6  I2    ---      NUV       Source identification number
                                    ([SOK2006] NUV-NN in Simbad)
   8- 13  F6.2  arcsec   oRA       Offset in Right Ascension (G2)
  15- 19  F5.2  arcsec   oDE       Offset in Declination (G2)
      21  A1    ---     l_NUVmag1  [>] Limit flag on NUVmag1
  22- 27  F6.3  mag      NUVmag1   ? Near-UV (2360Å) magnitudes in the STMAG
                                    system at MJD 51315.56
  29- 33  F5.3  mag     e_NUVmag1  ? Error in NUVmag1 (G3)
      35  A1    ---     l_NUVmag2  [>] Limit flag on NUVmag2
  36- 41  F6.3  mag      NUVmag2   ? Near-UV (2360Å) magnitudes in the STMAG
                                    system at MJD 52120.97
  43- 47  F5.3  mag     e_NUVmag2  ? Error in NUVmag2 (G3)
      49  A1    ---     l_NUVmag3  [>] Limit flag on NUVmag3
  50- 55  F6.3  mag      NUVmag3   ? Near-UV (2360Å) magnitudes in the STMAG
                                    system at MJD 52332.20
  57- 61  F5.3  mag     e_NUVmag3  ? Error in NUVmag3 (G3)
      63  A1    ---     l_NUVmag4  [>] Limit flag on NUVmag4
  64- 69  F6.3  mag      NUVmag4   Near-UV (2360Å) magnitudes in the STMAG
                                    system at MJD 52472.37
  71- 75  F5.3  mag     e_NUVmag4  ? Error in NUVmag4 (G3)
  77- 82  F6.3  mag      NUVmag    Mean Near-UV (2360Å) magnitudes in the
                                    STMAG system
  84- 88  F5.3  mag      e_NUVmag  Error in NUVmag (G3)


Byte-by-byte Description of file: table4.dat

   Bytes Format Units    Label      Explanations

   1-  4  I4    ---      [SOK2006]  Source identification number
                                     ([SOK2006] NNNN in Simbad) (G1)
   6- 10  F5.2  arcsec   oRA        Right Ascension offset (G2)
  12- 17  F6.2  arcsec   oDE        Declination offset (G2)
  19- 23  F5.2  arcsec   Dist       Angular radial distance from M87 center
      25  A1    ---      l_FUVmag   Limit flag on FUVmag
  27- 32  F6.3  mag      FUVmag     Far-UV (1460Å) magnitude in the STMAG
                                     system
  34- 38  F5.3  mag      e_FUVmag   ? Error in FUVmag (G3) (3)
      40  A1    ---      l_FUV-V    Limit flag on FUV-V
  42- 47  F6.3  mag      FUV-V      Dereddened (FUV-V) color index (G4) (4)
  49- 53  F5.3  mag      e_FUV-V    ? Error in FUV-V
  55- 59  F5.3  mag      V-I        ? Dereddened (V-I) color index (G4) (4)
  61- 65  F5.3  mag      e_V-I      ? Error in V-I

Note (3): For optical-only sources we determine upper limits to the far-UV
          magnitudes using the fluxes plus 3σ when the measured fluxes
          are positive and 3σ when the measured fluxes are negative.
Note (4): For UV-only sources, we determine upper limits to the V magnitudes
          using the fluxes plus 3σ when the measured fluxes are positive
          and 3σ when the measured fluxes are negative.


Byte-by-byte Description of file: table5.dat

   Bytes Format Units    Label      Explanations

   1-  4  I4    ---      [SOK2006]  Source identification number
                                     ([SOK2006] NNNN in Simbad) (G1) (1)
   6- 11  F6.2  arcsec   oRA        Right Ascension offset (G2)
  13- 17  F5.2  arcsec   oDE        Declination offset (G2)
  19- 23  F5.2  arcsec   Dist       Angular radial distance from M87 center
  25- 30  F6.3  mag      FUVmag     ? Far-UV (1460Å) magnitude in the STMAG
                                     system
  32- 36  F5.3  mag      e_FUVmag   ? Error in FUVmag (G3)
  38- 43  F6.3  mag      NUVmag     Near-UV  (2360Å) magnitude in the STMAG
                                     system
  45- 49  F5.3  mag      e_NUVmag   Error in NUVmag (G3)
  51- 55  F5.3  mag      FUV-V      ? Dereddened (FUV-V) color index (G4)
  57- 61  F5.3  mag      e_FUV-V    ? Error in FUV-V
  63- 67  F5.3  mag      NUV-V      Dereddened (NUV-V) color index (G4)
  69- 73  F5.3  mag      e_NUV-V    Error in NUV-V
  75- 79  F5.3  mag      V-I        Dereddened (V-I) color index (G4)
  81- 85  F5.3  mag      e_V-I      Error in V-I
  87- 88  I2    ---      [KWS99]    Kundu et al. (1999, Cat. J/ApJ/513/733)
                                     identification number

Note (1): This table contains only those Field 4 sources with both UV and
          optical identifications. Table 5 contains the UV-only sources in this
          field.


Byte-by-byte Description of file: table6.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     NGC       NGC number
   6- 16  A11   ---     OName     Other name
  18- 21  F4.2  mag     FUV-V     ? Dereddened (FUV-V) color index
  23- 26  F4.2  mag     e_FUV-V   ? Error in FUV-V
  28- 32  F5.2  mag     FUV-NUV   ? Dereddened (FUV-NUV) color index
  34- 38  F5.2  mag    e_FUV-NUV  ? Error in FUV-NUV
  40- 43  F4.2  mag     NUV-V     Dereddened (NUV-V) color index
  45- 48  F4.2  mag     e_NUV-V   ? Error in NUV-V
  50- 53  F4.2  mag     V-I       Dereddened (V-I) color index
  55- 60  F6.2  mag     MV        MV Absolute V magnitude
  62- 66  F5.2  [Sun]   [Fe/H]    Abundance [Fe/H]
  68- 72  F5.3  mag     Mg2       Mg2 line index
  74- 78  F5.3  mag     e_Mg2     Error in Mg2
  80- 83  F4.2  mag     E(B-V)    (B-V) color excess
      84  A1    ---     f_E(B-V)  [a] Indicates clusters with revised reddenings


Global Notes:

Note (G1): Each object has a 4 digit ID number. The first digit is the field
           number, the second is a flag indicating whether an object meets the
           3σ detection criterion both in optical and far-UV (0), only in
           optical (1), or only in far-UV (2); and the last two digits are
           serial numbers for each detection flag type sorted in order of
           ascending oRA.
Note (G2): From the center of M87 at 12 30 49.42 +12 23 28.0 (ICRS; Ma et al.,
           1998 Cat. I/251). Note that Kundu et al. (1999, Cat.
           J/ApJ/513/733) used different coordinates for the center of M87.
Note (G3): Includes random photon noise, scatter in sky pixel values, and
           uncertainties in mean sky measurements.
Note (G4): We used the adopted extinction to correct for reddening. V and I
           magnitudes and errors are from a complete catalog of Kundu et al.
           (1999, Cat. J/ApJ/513/733).


History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    12-Jan-2007