Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)

Armando Gil De Paz; Barry F. Madore; Young Jong Sohn; Young Wook Lee; Mark Seibert; R. Michael Rich; Luciana Bianchi; Tom A. Barlow; Young Ik Byun; José Donas; Karl Forster; Peter G. Friedman; Timothy M. Heckman; Patrick Jelinsky; Roger F. Malina; D. Christopher Martin; Bruno Milliard; Patrick Morrissey; Susan G. Neff; David Schiminovich; Oswald H.W. Siegmund; Todd Small; Alex S. Szalay; Barry Y. Welsh; Ted K. Wyder

doi:10.1086/422470

Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)

Armando Gil De Paz, Barry F. Madore, Young Jong Sohn, Young Wook Lee, Mark Seibert, R. Michael Rich, Luciana Bianchi, Tom A. Barlow, Young Ik Byun, José Donas, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Patrick Jelinsky, Roger F. Malina, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff, David SchiminovichOswald H.W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

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Abstract

M32, the compact elliptical galaxy companion to the Andromeda spiral galaxy, has been imaged by the Galaxy Evolution Explorer (GALEX) in two UV bands, centered at ∼1500 (far-ultraviolet [FUV]) and 2300 Å (near-ultraviolet). The imaging data have been carefully decomposed so as to properly account for the complicated background contamination from the disk of M31. We have derived the surface brightness and color profiles finding a slightly positive color gradient of Δ(FUV-B)/Δ log r = +0.15 ± 0.03 within one effective radius. Earlier data from the Ultraviolet Imaging Telescope suggested that M32 had an extremely large (negative) FUV-optical color gradient [Δ(FUV-B)/Δ log r < -2], inverted with respect to the majority of gradients seen in giant elliptical galaxies. Our new results show that despite its very low UV upturn, M32 has similar UV properties to those observed in luminous elliptical galaxies.

Original language	English
Pages (from-to)	L115-L118
Journal	Astrophysical Journal
Volume	619
Issue number	1 II
DOIs	https://doi.org/10.1086/422470
Publication status	Published - 2005 Jan 20

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/422470

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De Paz, A. G., Madore, B. F., Sohn, Y. J., Lee, Y. W., Seibert, M., Rich, R. M., Bianchi, L., Barlow, T. A., Byun, Y. I., Donas, J., Forster, K., Friedman, P. G., Heckman, T. M., Jelinsky, P., Malina, R. F., Martin, D. C., Milliard, B., Morrissey, P., Neff, S. G., ... Wyder, T. K. (2005). Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221). Astrophysical Journal, 619(1 II), L115-L118. https://doi.org/10.1086/422470

@article{8e64bb9fd1044ac4913ce9b7c5382e51,

title = "Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)",

abstract = "M32, the compact elliptical galaxy companion to the Andromeda spiral galaxy, has been imaged by the Galaxy Evolution Explorer (GALEX) in two UV bands, centered at ∼1500 (far-ultraviolet [FUV]) and 2300 {\AA} (near-ultraviolet). The imaging data have been carefully decomposed so as to properly account for the complicated background contamination from the disk of M31. We have derived the surface brightness and color profiles finding a slightly positive color gradient of Δ(FUV-B)/Δ log r = +0.15 ± 0.03 within one effective radius. Earlier data from the Ultraviolet Imaging Telescope suggested that M32 had an extremely large (negative) FUV-optical color gradient [Δ(FUV-B)/Δ log r < -2], inverted with respect to the majority of gradients seen in giant elliptical galaxies. Our new results show that despite its very low UV upturn, M32 has similar UV properties to those observed in luminous elliptical galaxies.",

keywords = "Galaxies: elliptical and lenticular, cD, Galaxies: fundamental parameters, Galaxies: individual (M32), Local Group, Ultraviolet: galaxies",

author = "{De Paz}, {Armando Gil} and Madore, {Barry F.} and Sohn, {Young Jong} and Lee, {Young Wook} and Mark Seibert and Rich, {R. Michael} and Luciana Bianchi and Barlow, {Tom A.} and Byun, {Young Ik} and Jos{\'e} Donas and Karl Forster and Friedman, {Peter G.} and Heckman, {Timothy M.} and Patrick Jelinsky and Malina, {Roger F.} and Martin, {D. Christopher} and Bruno Milliard and Patrick Morrissey and Neff, {Susan G.} and David Schiminovich and Siegmund, {Oswald H.W.} and Todd Small and Szalay, {Alex S.} and Welsh, {Barry Y.} and Wyder, {Ted K.}",

year = "2005",

month = jan,

day = "20",

doi = "10.1086/422470",

language = "English",

volume = "619",

pages = "L115--L118",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 II",

}

De Paz, AG, Madore, BF, Sohn, YJ , Lee, YW, Seibert, M, Rich, RM, Bianchi, L, Barlow, TA, Byun, YI, Donas, J, Forster, K, Friedman, PG, Heckman, TM, Jelinsky, P, Malina, RF, Martin, DC, Milliard, B, Morrissey, P, Neff, SG, Schiminovich, D, Siegmund, OHW, Small, T, Szalay, AS, Welsh, BY & Wyder, TK 2005, 'Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)', Astrophysical Journal, vol. 619, no. 1 II, pp. L115-L118. https://doi.org/10.1086/422470

TY - JOUR

T1 - Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)

AU - De Paz, Armando Gil

AU - Madore, Barry F.

AU - Sohn, Young Jong

AU - Lee, Young Wook

AU - Seibert, Mark

AU - Rich, R. Michael

AU - Bianchi, Luciana

AU - Barlow, Tom A.

AU - Byun, Young Ik

AU - Donas, José

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Heckman, Timothy M.

AU - Jelinsky, Patrick

AU - Malina, Roger F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Schiminovich, David

AU - Siegmund, Oswald H.W.

AU - Small, Todd

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

AU - Wyder, Ted K.

PY - 2005/1/20

Y1 - 2005/1/20

N2 - M32, the compact elliptical galaxy companion to the Andromeda spiral galaxy, has been imaged by the Galaxy Evolution Explorer (GALEX) in two UV bands, centered at ∼1500 (far-ultraviolet [FUV]) and 2300 Å (near-ultraviolet). The imaging data have been carefully decomposed so as to properly account for the complicated background contamination from the disk of M31. We have derived the surface brightness and color profiles finding a slightly positive color gradient of Δ(FUV-B)/Δ log r = +0.15 ± 0.03 within one effective radius. Earlier data from the Ultraviolet Imaging Telescope suggested that M32 had an extremely large (negative) FUV-optical color gradient [Δ(FUV-B)/Δ log r < -2], inverted with respect to the majority of gradients seen in giant elliptical galaxies. Our new results show that despite its very low UV upturn, M32 has similar UV properties to those observed in luminous elliptical galaxies.

AB - M32, the compact elliptical galaxy companion to the Andromeda spiral galaxy, has been imaged by the Galaxy Evolution Explorer (GALEX) in two UV bands, centered at ∼1500 (far-ultraviolet [FUV]) and 2300 Å (near-ultraviolet). The imaging data have been carefully decomposed so as to properly account for the complicated background contamination from the disk of M31. We have derived the surface brightness and color profiles finding a slightly positive color gradient of Δ(FUV-B)/Δ log r = +0.15 ± 0.03 within one effective radius. Earlier data from the Ultraviolet Imaging Telescope suggested that M32 had an extremely large (negative) FUV-optical color gradient [Δ(FUV-B)/Δ log r < -2], inverted with respect to the majority of gradients seen in giant elliptical galaxies. Our new results show that despite its very low UV upturn, M32 has similar UV properties to those observed in luminous elliptical galaxies.

KW - Galaxies: elliptical and lenticular, cD

KW - Galaxies: fundamental parameters

KW - Galaxies: individual (M32)

KW - Local Group

KW - Ultraviolet: galaxies

UR - http://www.scopus.com/inward/record.url?scp=20044368799&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=20044368799&partnerID=8YFLogxK

U2 - 10.1086/422470

DO - 10.1086/422470

M3 - Article

AN - SCOPUS:20044368799

SN - 0004-637X

VL - 619

SP - L115-L118

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221)

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