Far-ultraviolet and visible imaging of the nucleus of M321

Andrew A. Cole, John S. Gallagher, Jeremy R. Mould, John T. Clarke, John T. Trauger, Alan M. Watson, Gilda E. Ballester, Christopher J. Burrows, Stefano Casertano, David Crisp, Richard E. Griffiths, Carl J. Grillmair, J. Jeff Hester, John G. Hoessel, Jon A. Holtzman, Paul A. Scowen, Karl R. Stapelfeldt, James R. Westphal

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We have imaged the nucleus of M32 at 1600 Å (FUV) and 5500 Å (V) using the Wide-Field/Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope. We detected the nucleus at 1600 A using the redleak-free Woods filter on WFPC2. The far-ultraviolet (FUV) light profile can be fitted with a Gaussian of FWHM 0″.46 (4.6 pixels) but cannot be resolved into individual stars; no UV-bright nuclear structure was detected. The (FUV -V) color of the nucleus is 4.9 ± 0.3, which is consistent with earlier observations. We are unable to confirm any radial variation in (FUV -V) within 0″.8 of the nucleus; beyond that radius the FUV surface brightness drops below our detection threshold. We also performed surface photometry in V and found our results to be in excellent agreement with deconvolved WFPC1 results. M32's light profile continues to rise in a nuclear cusp even within 0″.1 of its center. No intermediate-age stellar population is required by evolutionary population synthesis models to reproduce the (FUV -V) color of the nucleus, although these data and current models are insufficient to resolve this issue.

Original languageEnglish (US)
Pages (from-to)230-235
Number of pages6
JournalAstrophysical Journal
Volume505
Issue number1 PART I
DOIs
StatePublished - 1998
Externally publishedYes

Keywords

  • Galaxies: individual (M32)
  • Galaxies: nuclei
  • Galaxies: stellar content ultraviolet: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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