J/MNRAS/445/630     Early-type galaxies in Ursa Major cluster       (Pak+, 2014)
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The properties of early-type galaxies in the Ursa Major cluster.
    Pak M., Rey S.-C., Lisker T., Lee Y., Kim S., Sung E.-C., Jerjen H.,
    Chung J.
   <Mon. Not. R. Astron. Soc., 445, 630-647 (2014)>
   =2014MNRAS.445..630P
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ADC_Keywords: Clusters, galaxy ; Morphology ; Photometry, SDSS ;
              Photometry, ultraviolet
Keywords: galaxies: clusters: individual: Ursa Major - galaxies: dwarf -
          galaxies: evolution - galaxies: structure

Abstract:
    Using SDSS-DR7 and NASA/IPAC Extragalactic Database spectroscopic
    data, we identify 166 galaxies as members of the Ursa Major cluster
    with M_r_<-13.5mag. We morphological classify all
    galaxies by means of carefully inspecting g-, r-, i-band colour and
    monochromatic images. We show that the Ursa Major cluster is dominated
    by late-type galaxies, but also contains a significant number of
    early-type galaxies, particularly in the dwarf regime. We present
    further evidence for the existence of several subgroups in the
    cluster, consistent with previous findings. The early-type fraction is
    found to correlate with the mass of the subgroup. We also investigate
    environmental effects by comparing the properties of the Ursa Major
    early-type dwarf galaxies to those of the Virgo cluster. In contrast
    to the Virgo, the red sequence of the Ursa Major cluster is only
    sparsely populated in the optical and ultraviolet colour-magnitude
    relations. It also shows a statistically significant gap between
    -18<M_r_<-17mag, i.e. the Ursa Major cluster lacks early-type dwarf
    galaxies at the bright end of their luminosity function. We discover
    that the majority of early-type dwarf galaxies in the Ursa Major
    cluster have blue cores with hints of recent or ongoing star
    formation. We suggest that gravitational tidal interactions can
    trigger central blue star-forming regions in early-type dwarfs. After
    that, star formation would only fade completely when the galaxies
    experience ram-pressure stripping or harassment, both of which are
    nearly absent in the Ursa Major cluster.

Description:
    Our sample in the Ursa Major cluster is predominantly based on the
    SDSS Data Release 7 (DR7; Abazajian et al., 2009ApJS..182..543A).

    In order to investigate the ultraviolet properties of our sample
    galaxies in the Ursa Major cluster, we used far-ultraviolet (FUV,
    1350-1750{AA}) and near-ultraviolet (NUV, 1750-2750{AA}) images from
    the GALEX GR6.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table2.dat    169      166   The Ursa Major cluster catalogue
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See also:
           II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
           II/294 : SDSS Photometric Catalog, DR 7 (Adelman-McCarthy+, 2009)
 J/AJ/112/2471    : The Ursa Major cluster. I. (Tully+ 1996)
 J/MNRAS/429/2264 : Anatomy of Ursa Majoris (Karachentsev+, 2013)

Byte-by-byte Description of file: table2.dat
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   Bytes Format Units   Label  Explanations
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   1-  4  A4    ---     ID     ID number, UNNN (1)
   6- 18  A13   ---     Name   Name (2)
  20- 27  F8.4  deg     RAdeg  Right ascension (J2000) from SExtractor
  29- 35  F7.4  deg     DEdeg  Declination (J2000) from SExtractor
  37- 43  F7.4  deg     SGLON  Supergalactic longitude
  45- 51  F7.4  deg     SGLAT  Supergalactic latitude
  53- 56  I4    km/s    HV     [620/1208] Heliocentric radial velocity from SDSS
      57  A1    ---   n_HV     [N] N when HV adopted from NED
  59- 62  I4    km/s    V0     Radial velocity that adjusted for the frame of
                               the Local Group by adding 300sinlcosb
  64- 68  A5    ---     Memb   [123, ] Membership from different catalogues (3)
  70- 74  A5    ---     Group  Name of group defined by Karachentsev et al.
                                (2013) which the galaxy belongs to
  76- 83  A8    ---     MType  Morphology of galaxy classified from this study
  85- 86  I2    ---     TT1    [-3/10]?=- RC3 T-type from Tully et al.
                                   (1996, Cat. J/AJ/112/2471)
  88- 89  I2    ---     TT2    [-3/10]?=- RC3 T-type from Karachentsev et al.
                                   (2013, Cat. J/MNRAS/429/2264)
  91- 95  F5.2  mag     umag   SDSS u magnitude
  97-100  F4.2  mag   e_umag   rms uncertainty on umag
 102-106  F5.2  mag     gmag   SDSS g magnitude
 108-111  F4.2  mag   e_gmag   rms uncertainty on gmag
 113-117  F5.2  mag     rmag   SDSS r magnitude
 119-122  F4.2  mag   e_rmag   rms uncertainty on rmag
 124-128  F5.2  mag     imag   SDSS i magnitude
 130-133  F4.2  mag   e_imag   rms uncertainty on imag
 135-139  F5.2  mag     zmag   SDSS z magnitude
 141-144  F4.2  mag   e_zmag   rms uncertainty on zmag
 146-150  F5.2  mag     NUV    ? GALEX NUV magnitude
 152-155  F4.2  mag   e_NUV    ? rms uncertainty on NUV
 157-161  F5.2  mag     FUV    ? GALEX FUV magnitude
 163-166  F4.2  mag   e_FUV    ? rms uncertainty on FUV
 168-169  A2    ---     Note   [bc] bc for blue-cored early-type dwarf galaxies
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Note (1): ID is marked with the R.A. The ID numbers larger than 200 are for
   galaxies which are only included in the catalogue of Karachentsev et al.
   (2013, Cat. J/MNRAS/429/2264).
Note (2): NGC, UGC or other name of galaxy from
   Tully et al. (1996, Cat. J/AJ/112/2471),
   Karachentsev et al. (2013, Cat. J/MNRAS/429/2264) and
   NED (troncated 2MASX and SDSS names)
Note (3): Membership of galaxy from:
   1 = this study
   2 = Tully et al. (1996, Cat. J/AJ/112/2471)
   3 = Karachentsev et al. (2013, Cat. J/MNRAS/429/2264)
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History:
    From electronic version of the journal

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(End)                                      Patricia Vannier [CDS]    30-Apr-2015