GALEX UV color relations for nearby early-type galaxies

José Donas, Jean Michel Deharveng, R. Michael Rich, Sukyoung Yi, Young-Wook Lee, Alessandro Boselli, Armando Gil De Paz, Samuel Boissier, Stéphane Charlot, Samir Salim, Luciana Bianchi, Tom A. Barlow, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Barry F. Madore, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff & 6 others David Schiminovich, Mark Seibert, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

Research output: Contribution to journalArticle

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Abstract

We use GALEX/optical photometry to construct color-color relationships for early-type galaxies sorted by morphological type. We have matched objects in the GALEX GR1 public release and the first IR1.1 internal release, with the RC3 early-type galaxies having a morphological type - 5.5 < T < -1.5, with mean error on T < 1.5 and mean error on (B - V)T < 0.05. After visual inspection of each match, we are left with 130 galaxies with reliable GALEX pipeline photometry in the far-UV and near-UV bands. This sample is divided into ellipticals (-5.5 < T < -3.5) and lenticulars (-3.5 < T < -1.5). After correction for Galactic extinction, the color-color diagrams FUV - NUV versus (B - V)TC are plotted for the two subsamples. We find a tight anticorrelation between the FUV - NUV and (B - V)TC colors for ellipticals, with the UV color getting bluer when the (B - V) TC gets redder. This relationship very likely is an extension of the color-metallicity relationship in the GALEX NUV band. We suspect that the main source of the correlation is metal line blanketing in the NUV band. The FUV - NUV versus B - V correlation has larger scatter for lenticular galaxies; we speculate that this reflects the presence of low-level star formation. If the latter objects (i.e., those that are blue both in FUV - NUV and in B - V) are interpreted as harboring recent star formation activity, this would be the case for a few percent (∼4%) of ellipticals and ∼ 15% of lenticulars; this would mean about 10% of early-type galaxies have residual star formation in our full sample of 130 early-type galaxies. We also plot FUV - NUV versus the Mg2 index and central velocity dispersion. We find a tight anticorrelation between FUV - NUV and the Mg2 index; we suspect that this reflects blanketing in the NUV band being correlated with overall metallicity. We find a marginal anticorrelation of FUV - VT with Mg2 for elliptical galaxies.

Original languageEnglish
Pages (from-to)597-606
Number of pages10
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007 Dec 1

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galaxies
color
star formation
metallicity
photometry
color-color diagram
elliptical galaxies
inspection
extinction
plots
diagram
metal
metals
index

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Donas, J., Deharveng, J. M., Rich, R. M., Yi, S., Lee, Y-W., Boselli, A., ... Wyder, T. K. (2007). GALEX UV color relations for nearby early-type galaxies. Astrophysical Journal, Supplement Series, 173(2), 597-606. https://doi.org/10.1086/516643
Donas, José ; Deharveng, Jean Michel ; Rich, R. Michael ; Yi, Sukyoung ; Lee, Young-Wook ; Boselli, Alessandro ; De Paz, Armando Gil ; Boissier, Samuel ; Charlot, Stéphane ; Salim, Samir ; Bianchi, Luciana ; Barlow, Tom A. ; Forster, Karl ; Friedman, Peter G. ; Heckman, Timothy M. ; Madore, Barry F. ; Martin, D. Christopher ; Milliard, Bruno ; Morrissey, Patrick ; Neff, Susan G. ; Schiminovich, David ; Seibert, Mark ; Small, Todd ; Szalay, Alex S. ; Welsh, Barry Y. ; Wyder, Ted K. / GALEX UV color relations for nearby early-type galaxies. In: Astrophysical Journal, Supplement Series. 2007 ; Vol. 173, No. 2. pp. 597-606.
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author = "Jos{\'e} Donas and Deharveng, {Jean Michel} and Rich, {R. Michael} and Sukyoung Yi and Young-Wook Lee and Alessandro Boselli and {De Paz}, {Armando Gil} and Samuel Boissier and St{\'e}phane Charlot and Samir Salim and Luciana Bianchi and Barlow, {Tom A.} and Karl Forster and Friedman, {Peter G.} and Heckman, {Timothy M.} and Madore, {Barry F.} and Martin, {D. Christopher} and Bruno Milliard and Patrick Morrissey and Neff, {Susan G.} and David Schiminovich and Mark Seibert and Todd Small and Szalay, {Alex S.} and Welsh, {Barry Y.} and Wyder, {Ted K.}",
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Donas, J, Deharveng, JM, Rich, RM, Yi, S, Lee, Y-W, Boselli, A, De Paz, AG, Boissier, S, Charlot, S, Salim, S, Bianchi, L, Barlow, TA, Forster, K, Friedman, PG, Heckman, TM, Madore, BF, Martin, DC, Milliard, B, Morrissey, P, Neff, SG, Schiminovich, D, Seibert, M, Small, T, Szalay, AS, Welsh, BY & Wyder, TK 2007, 'GALEX UV color relations for nearby early-type galaxies', Astrophysical Journal, Supplement Series, vol. 173, no. 2, pp. 597-606. https://doi.org/10.1086/516643

GALEX UV color relations for nearby early-type galaxies. / Donas, José; Deharveng, Jean Michel; Rich, R. Michael; Yi, Sukyoung; Lee, Young-Wook; Boselli, Alessandro; De Paz, Armando Gil; Boissier, Samuel; Charlot, Stéphane; Salim, Samir; Bianchi, Luciana; Barlow, Tom A.; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Madore, Barry F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Small, Todd; Szalay, Alex S.; Welsh, Barry Y.; Wyder, Ted K.

In: Astrophysical Journal, Supplement Series, Vol. 173, No. 2, 01.12.2007, p. 597-606.

Research output: Contribution to journalArticle

TY - JOUR

T1 - GALEX UV color relations for nearby early-type galaxies

AU - Donas, José

AU - Deharveng, Jean Michel

AU - Rich, R. Michael

AU - Yi, Sukyoung

AU - Lee, Young-Wook

AU - Boselli, Alessandro

AU - De Paz, Armando Gil

AU - Boissier, Samuel

AU - Charlot, Stéphane

AU - Salim, Samir

AU - Bianchi, Luciana

AU - Barlow, Tom A.

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Heckman, Timothy M.

AU - Madore, Barry F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Schiminovich, David

AU - Seibert, Mark

AU - Small, Todd

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

AU - Wyder, Ted K.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We use GALEX/optical photometry to construct color-color relationships for early-type galaxies sorted by morphological type. We have matched objects in the GALEX GR1 public release and the first IR1.1 internal release, with the RC3 early-type galaxies having a morphological type - 5.5 < T < -1.5, with mean error on T < 1.5 and mean error on (B - V)T < 0.05. After visual inspection of each match, we are left with 130 galaxies with reliable GALEX pipeline photometry in the far-UV and near-UV bands. This sample is divided into ellipticals (-5.5 < T < -3.5) and lenticulars (-3.5 < T < -1.5). After correction for Galactic extinction, the color-color diagrams FUV - NUV versus (B - V)TC are plotted for the two subsamples. We find a tight anticorrelation between the FUV - NUV and (B - V)TC colors for ellipticals, with the UV color getting bluer when the (B - V) TC gets redder. This relationship very likely is an extension of the color-metallicity relationship in the GALEX NUV band. We suspect that the main source of the correlation is metal line blanketing in the NUV band. The FUV - NUV versus B - V correlation has larger scatter for lenticular galaxies; we speculate that this reflects the presence of low-level star formation. If the latter objects (i.e., those that are blue both in FUV - NUV and in B - V) are interpreted as harboring recent star formation activity, this would be the case for a few percent (∼4%) of ellipticals and ∼ 15% of lenticulars; this would mean about 10% of early-type galaxies have residual star formation in our full sample of 130 early-type galaxies. We also plot FUV - NUV versus the Mg2 index and central velocity dispersion. We find a tight anticorrelation between FUV - NUV and the Mg2 index; we suspect that this reflects blanketing in the NUV band being correlated with overall metallicity. We find a marginal anticorrelation of FUV - VT with Mg2 for elliptical galaxies.

AB - We use GALEX/optical photometry to construct color-color relationships for early-type galaxies sorted by morphological type. We have matched objects in the GALEX GR1 public release and the first IR1.1 internal release, with the RC3 early-type galaxies having a morphological type - 5.5 < T < -1.5, with mean error on T < 1.5 and mean error on (B - V)T < 0.05. After visual inspection of each match, we are left with 130 galaxies with reliable GALEX pipeline photometry in the far-UV and near-UV bands. This sample is divided into ellipticals (-5.5 < T < -3.5) and lenticulars (-3.5 < T < -1.5). After correction for Galactic extinction, the color-color diagrams FUV - NUV versus (B - V)TC are plotted for the two subsamples. We find a tight anticorrelation between the FUV - NUV and (B - V)TC colors for ellipticals, with the UV color getting bluer when the (B - V) TC gets redder. This relationship very likely is an extension of the color-metallicity relationship in the GALEX NUV band. We suspect that the main source of the correlation is metal line blanketing in the NUV band. The FUV - NUV versus B - V correlation has larger scatter for lenticular galaxies; we speculate that this reflects the presence of low-level star formation. If the latter objects (i.e., those that are blue both in FUV - NUV and in B - V) are interpreted as harboring recent star formation activity, this would be the case for a few percent (∼4%) of ellipticals and ∼ 15% of lenticulars; this would mean about 10% of early-type galaxies have residual star formation in our full sample of 130 early-type galaxies. We also plot FUV - NUV versus the Mg2 index and central velocity dispersion. We find a tight anticorrelation between FUV - NUV and the Mg2 index; we suspect that this reflects blanketing in the NUV band being correlated with overall metallicity. We find a marginal anticorrelation of FUV - VT with Mg2 for elliptical galaxies.

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