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Far-Ultraviolet and Visible Imaging of the Nucleus of M32


Cole, AA and Gallagher, JS and Mould, JR and Clarke, JT and Trauger, JT and Watson, AM and Ballester, GE and Burrows, CJ and Casertano, S and Crisp, D and Griffiths, RE and Grillmair, CJ and Hester, JJ and Hoessel, JG and Holtzman, JA and Scowen, PA and Stapelfeldt, KR and Westphal, JR, Far-Ultraviolet and Visible Imaging of the Nucleus of M32, The Astrophysical Journal, 505, (1) pp. 230-235. ISSN 0004-637X (1998) [Refereed Article]

DOI: doi:10.1086/306169


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. © 1998. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Associate Professor Andrew Cole)
ID Code:45332
Year Published:1998
Web of Science® Times Cited:12
Deposited By:Physics
Deposited On:2007-07-10
Last Modified:2007-07-10

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