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

doi:10.1086/306169

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 journal › Article › peer-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 language	English (US)
Pages (from-to)	230-235
Number of pages	6
Journal	Astrophysical Journal
Volume	505
Issue number	1 PART I
DOIs	https://doi.org/10.1086/306169
State	Published - 1998
Externally published	Yes

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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10.1086/306169

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Cole, A. A., Gallagher, J. S., Mould, J. R., Clarke, J. T., Trauger, J. T., Watson, A. M., Ballester, G. E., Burrows, C. J., Casertano, S., Crisp, D., Griffiths, R. E., Grillmair, C. J., Jeff Hester, J., Hoessel, J. G., Holtzman, J. A., Scowen, P. A., Stapelfeldt, K. R., & Westphal, J. R. (1998). Far-ultraviolet and visible imaging of the nucleus of M321. Astrophysical Journal, 505(1 PART I), 230-235. https://doi.org/10.1086/306169

Cole, AA, Gallagher, JS, Mould, JR, Clarke, JT, Trauger, JT, Watson, AM, Ballester, GE, Burrows, CJ, Casertano, S, Crisp, D, Griffiths, RE, Grillmair, CJ, Jeff Hester, J, Hoessel, JG, Holtzman, JA, Scowen, PA, Stapelfeldt, KR & Westphal, JR 1998, 'Far-ultraviolet and visible imaging of the nucleus of M321', Astrophysical Journal, vol. 505, no. 1 PART I, pp. 230-235. https://doi.org/10.1086/306169

@article{64d712fecc1e4af4a35f892561ef6e94,

title = "Far-ultraviolet and visible imaging of the nucleus of M321",

abstract = "We have imaged the nucleus of M32 at 1600 {\AA} (FUV) and 5500 {\AA} (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.",

keywords = "Galaxies: individual (M32), Galaxies: nuclei, Galaxies: stellar content ultraviolet: galaxies",

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

year = "1998",

doi = "10.1086/306169",

language = "English (US)",

volume = "505",

pages = "230--235",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 PART I",

}

TY - JOUR

T1 - Far-ultraviolet and visible imaging of the nucleus of M321

AU - Cole, Andrew A.

AU - Gallagher, John S.

AU - Mould, Jeremy R.

AU - Clarke, John T.

AU - Trauger, John T.

AU - Watson, Alan M.

AU - Ballester, Gilda E.

AU - Burrows, Christopher J.

AU - Casertano, Stefano

AU - Crisp, David

AU - Griffiths, Richard E.

AU - Grillmair, Carl J.

AU - Jeff Hester, J.

AU - Hoessel, John G.

AU - Holtzman, Jon A.

AU - Scowen, Paul A.

AU - Stapelfeldt, Karl R.

AU - Westphal, James R.

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

KW - Galaxies: individual (M32)

KW - Galaxies: nuclei

KW - Galaxies: stellar content ultraviolet: galaxies

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U2 - 10.1086/306169

DO - 10.1086/306169

M3 - Article

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SN - 0004-637X

VL - 505

SP - 230

EP - 235

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART I

ER -

Far-ultraviolet and visible imaging of the nucleus of M321

Abstract

Keywords

ASJC Scopus subject areas

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