Radial variation of attenuation and star formation in the largest late-type disks observed with Galex

Samuel Boissier, Armando Gil De Paz, Alessandro Boselli, Barry F. Madore, Véronique Buat, Luca Cortese, Denis Burgarella, Juan Carlos Muñoz Mateos, Tom A. Barlow, Karl Forster, Peter G. Friedman, D. Christopher Martin, Patrick Morrissey, Susan G. Neff, David Schiminovich, Mark Seibert, Todd Small, Ted K. Wyder, Luciana Bianchi, José Donas & 7 others Timothy M. Heckman, Young-Wook Lee, Bruno Milliard, R. Michael Rich, Alex S. Szalay, Barry Y. Welsh, Sukyoung Yi

Research output: Contribution to journalArticle

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Abstract

For a sample of 43 nearby, late-type galaxies, we have investigated the radial variation of both the current star formation rate and the dust-induced UV light attenuation. To do this we have cross-correlated IRAS images and GALEX observations for each of these galaxies and compiled observations of the gas (CO and H I) and metal-abundance gradients found in the literature. We find that attenuation correlates with metallicity. We then use the UV profiles, corrected for attenuation, to study several variants of the Schmidt law and conclude that our results are compatible with a simple law similar to the one of Kennicutt extending smoothly to lower surface densities, but with considerable scatter. We do not detect an abrupt break in the UV light at the threshold radius derived from Hα data (at which the Hα profile shows a break and beyond which only a few H n regions are usually found). We interpret the Ha sudden break not as a change in the star formation regime (as often suggested), but as the vanishingly small number of ionizing stars corresponding to low levels of star formation.

Original languageEnglish
Pages (from-to)524-537
Number of pages14
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007 Dec 1

Fingerprint

light attenuation
star formation
attenuation
dust
metal
gas
galaxies
Infrared Astronomy Satellite
star formation rate
profiles
metallicity
stars
gradients
radii
thresholds
gases
metals
rate

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Boissier, Samuel ; Gil De Paz, Armando ; Boselli, Alessandro ; Madore, Barry F. ; Buat, Véronique ; Cortese, Luca ; Burgarella, Denis ; Mateos, Juan Carlos Muñoz ; Barlow, Tom A. ; Forster, Karl ; Friedman, Peter G. ; Christopher Martin, D. ; Morrissey, Patrick ; Neff, Susan G. ; Schiminovich, David ; Seibert, Mark ; Small, Todd ; Wyder, Ted K. ; Bianchi, Luciana ; Donas, José ; Heckman, Timothy M. ; Lee, Young-Wook ; Milliard, Bruno ; Michael Rich, R. ; Szalay, Alex S. ; Welsh, Barry Y. ; Yi, Sukyoung. / Radial variation of attenuation and star formation in the largest late-type disks observed with Galex. In: Astrophysical Journal, Supplement Series. 2007 ; Vol. 173, No. 2. pp. 524-537.
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abstract = "For a sample of 43 nearby, late-type galaxies, we have investigated the radial variation of both the current star formation rate and the dust-induced UV light attenuation. To do this we have cross-correlated IRAS images and GALEX observations for each of these galaxies and compiled observations of the gas (CO and H I) and metal-abundance gradients found in the literature. We find that attenuation correlates with metallicity. We then use the UV profiles, corrected for attenuation, to study several variants of the Schmidt law and conclude that our results are compatible with a simple law similar to the one of Kennicutt extending smoothly to lower surface densities, but with considerable scatter. We do not detect an abrupt break in the UV light at the threshold radius derived from Hα data (at which the Hα profile shows a break and beyond which only a few H n regions are usually found). We interpret the Ha sudden break not as a change in the star formation regime (as often suggested), but as the vanishingly small number of ionizing stars corresponding to low levels of star formation.",
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Boissier, S, Gil De Paz, A, Boselli, A, Madore, BF, Buat, V, Cortese, L, Burgarella, D, Mateos, JCM, Barlow, TA, Forster, K, Friedman, PG, Christopher Martin, D, Morrissey, P, Neff, SG, Schiminovich, D, Seibert, M, Small, T, Wyder, TK, Bianchi, L, Donas, J, Heckman, TM, Lee, Y-W, Milliard, B, Michael Rich, R, Szalay, AS, Welsh, BY & Yi, S 2007, 'Radial variation of attenuation and star formation in the largest late-type disks observed with Galex', Astrophysical Journal, Supplement Series, vol. 173, no. 2, pp. 524-537. https://doi.org/10.1086/516642

Radial variation of attenuation and star formation in the largest late-type disks observed with Galex. / Boissier, Samuel; Gil De Paz, Armando; Boselli, Alessandro; Madore, Barry F.; Buat, Véronique; Cortese, Luca; Burgarella, Denis; Mateos, Juan Carlos Muñoz; Barlow, Tom A.; Forster, Karl; Friedman, Peter G.; Christopher Martin, D.; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Small, Todd; Wyder, Ted K.; Bianchi, Luciana; Donas, José; Heckman, Timothy M.; Lee, Young-Wook; Milliard, Bruno; Michael Rich, R.; Szalay, Alex S.; Welsh, Barry Y.; Yi, Sukyoung.

In: Astrophysical Journal, Supplement Series, Vol. 173, No. 2, 01.12.2007, p. 524-537.

Research output: Contribution to journalArticle

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T1 - Radial variation of attenuation and star formation in the largest late-type disks observed with Galex

AU - Boissier, Samuel

AU - Gil De Paz, Armando

AU - Boselli, Alessandro

AU - Madore, Barry F.

AU - Buat, Véronique

AU - Cortese, Luca

AU - Burgarella, Denis

AU - Mateos, Juan Carlos Muñoz

AU - Barlow, Tom A.

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Christopher Martin, D.

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Schiminovich, David

AU - Seibert, Mark

AU - Small, Todd

AU - Wyder, Ted K.

AU - Bianchi, Luciana

AU - Donas, José

AU - Heckman, Timothy M.

AU - Lee, Young-Wook

AU - Milliard, Bruno

AU - Michael Rich, R.

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

AU - Yi, Sukyoung

PY - 2007/12/1

Y1 - 2007/12/1

N2 - For a sample of 43 nearby, late-type galaxies, we have investigated the radial variation of both the current star formation rate and the dust-induced UV light attenuation. To do this we have cross-correlated IRAS images and GALEX observations for each of these galaxies and compiled observations of the gas (CO and H I) and metal-abundance gradients found in the literature. We find that attenuation correlates with metallicity. We then use the UV profiles, corrected for attenuation, to study several variants of the Schmidt law and conclude that our results are compatible with a simple law similar to the one of Kennicutt extending smoothly to lower surface densities, but with considerable scatter. We do not detect an abrupt break in the UV light at the threshold radius derived from Hα data (at which the Hα profile shows a break and beyond which only a few H n regions are usually found). We interpret the Ha sudden break not as a change in the star formation regime (as often suggested), but as the vanishingly small number of ionizing stars corresponding to low levels of star formation.

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