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, Yong-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

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish
JournalAstrophysical Journal
Volume619
Issue number1 II
DOIs
Publication statusPublished - 2005 Jan 20

Fingerprint

elliptical galaxies
brightness
galaxies
color
gradients
profiles
Andromeda Galaxy
compact galaxies
spiral galaxies
contamination
telescopes
radii

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

De Paz, Armando Gil ; Madore, Barry F. ; Sohn, Young-Jong ; Lee, Young-Wook ; Seibert, Mark ; Rich, R. Michael ; Bianchi, Luciana ; Barlow, Tom A. ; Byun, Yong-Ik ; Donas, José ; Forster, Karl ; Friedman, Peter G. ; Heckman, Timothy M. ; Jelinsky, Patrick ; Malina, Roger F. ; Martin, D. Christopher ; Milliard, Bruno ; Morrissey, Patrick ; Neff, Susan G. ; Schiminovich, David ; Siegmund, Oswald H.W. ; Small, Todd ; Szalay, Alex S. ; Welsh, Barry Y. ; Wyder, Ted K. / Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221). In: Astrophysical Journal. 2005 ; Vol. 619, No. 1 II.
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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.",
author = "{De Paz}, {Armando Gil} and Madore, {Barry F.} and Young-Jong Sohn and Young-Wook Lee and Mark Seibert and Rich, {R. Michael} and Luciana Bianchi and Barlow, {Tom A.} and Yong-Ik Byun 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.}",
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De Paz, AG, Madore, BF, Sohn, Y-J, Lee, Y-W, Seibert, M, Rich, RM, Bianchi, L, Barlow, TA, Byun, Y-I, 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. https://doi.org/10.1086/422470

Galaxy evolution explorer observations of the ultraviolet surface brightness and color profiles of the local group elliptical galaxy M32 (NGC 221). / De Paz, Armando Gil; Madore, Barry F.; Sohn, Young-Jong; Lee, Young-Wook; Seibert, Mark; Rich, R. Michael; Bianchi, Luciana; Barlow, Tom A.; Byun, Yong-Ik; Donas, José; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Siegmund, Oswald H.W.; Small, Todd; Szalay, Alex S.; Welsh, Barry Y.; Wyder, Ted K.

In: Astrophysical Journal, Vol. 619, No. 1 II, 20.01.2005.

Research output: Contribution to journalArticle

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, Yong-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.

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