LIGHT AND COLOR DISTRIBUTION IN THE CORE OF M32

被引:0
|
作者
MICHARD, R
NIETO, JL
机构
[1] OBSERV MIDI PYRENEES, CNRS, UA 285, F-31400 TOULOUSE, FRANCE
[2] CANADA FRANCE HAWAII TELESCOPE CORP, KAMUELA, HI 96743 USA
关键词
GALAXIES; ELLIPTICALS; FORMATION; PHOTOMETRY; STRUCTURE; M32;
D O I
暂无
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present results from high-resolution imaging of the central region of M32 in the U, B, R and 1-mu-m bands. The resolutions (FWHM) range from 0.60 arcsec at 1-mu-m to 0.92 arcsec in the U band. All images show 'pointed' isophotes within the central 5 arcsec, the deviations from ellipticity being small (maximum congruent-to 0.01) but significant, suggesting that a nuclear disk is present within the central 15 pc. We find no color gradient in either U - B nor B - R at sub-arcsecond resolution (a small gradient is however suggested at longer wavelengths). An empirical model fitting the observations after convolution by the appropriate Point-Spread-Function yields an intrinsic half width at half maximum ('core' radius) of 0.32 arcsec, a central surface brightness B = 12.65, and constant central colors (U - B = 0.56, B - R = 1.52), axis ratio (c/a = 0.71) and position angle throughout the central region (r < 10 arcsec). The implications of these results on the formation of M32 by dissipational collapse are briefly discussed.
引用
收藏
页码:L17 / L20
页数:4
相关论文
共 50 条
  • [21] The missing ISM of NGC 147 and M32
    Welch, GA
    Sage, LJ
    STAR FORMATION IN EARLY-TYPE GALAXIES, 1999, 163 : 289 - 291
  • [22] THE NUCLEUS OF M32 AT 0.2 ARCSEC RESOLUTION
    LUGGER, PM
    COHN, HN
    CEDERBLOOM, SE
    LAUER, TR
    MCCLURE, RD
    ASTRONOMICAL JOURNAL, 1992, 104 (01): : 83 - &
  • [23] An analysis of the composite stellar population in M32
    Coelho, P.
    de Oliveira, C. Mendes
    Fernandes, R. Cid
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2009, 396 (02) : 624 - 634
  • [24] EVIDENCE FOR A CENTRAL MASS CONCENTRATION IN M32
    TONRY, JL
    ASTROPHYSICAL JOURNAL, 1984, 283 (02): : L27 - L30
  • [25] THE MASS AND HALO DISPERSION PROFILE OF M32
    NOLTHENIUS, R
    FORD, H
    ASTROPHYSICAL JOURNAL, 1986, 305 (02): : 600 - 608
  • [26] A CENTRAL BLACK-HOLE IN M32
    TONRY, JL
    ASTROPHYSICAL JOURNAL, 1987, 322 (02): : 632 - 642
  • [27] An analysis of the composite stellar population in M32
    Coelho, P.
    Mendes de Oliveira, C.
    Cid Fernandes, R.
    STELLAR POPULATIONS: PLANNING FOR THE NEXT DECADE, 2010, (262): : 143 - +
  • [28] ROSAT HRI and PSPC observations of M32
    Zang, Z
    Meurs, EJA
    STELLAR CONTENT OF LOCAL GROUP GALAXIES, 1999, (192): : 334 - 337
  • [29] Variation in the surface brightness fluctuations of M32
    Sodemann, M
    Thomsen, B
    ASTRONOMICAL JOURNAL, 1996, 111 (01): : 208 - 219
  • [30] Color-luminosity relations for the resolved hot stellar populations in the centers of M31 and M32
    Brown, TM
    Ferguson, HC
    Stanford, SA
    Deharveng, JM
    ASTROPHYSICAL JOURNAL, 1998, 504 (01): : 113 - 138