A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101

Cristina C. Popescu, Richard J. Tuffs, Barry F. Madore, Armando Gil De Paz, Heinrich J. Völk, Tom Barlow, Luciana Bianchi, Yong Ik Byun, Jose Donas, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Roger F. Malina, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. Neff, R. Michael RichDavid Schiminovich, Oswald H.W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

Research output: Contribution to journalArticle

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Abstract

The total ultraviolet (UV) flux (from 1412 to 2718 Å) of M101 is compared on a pixel-to-pixel basis with the total far-infrared (FIR) flux (from 60 to 170 μm) using the maps of the galaxy taken by the Galaxy Evolution Explorer (GALEX) in the near-UV and far-UV and by the Infrared Space Observatory (ISO) at 60, 100, and 170 μm. The main result of this investigation is the discovery of a tight dependence of the FIR/UV ratio on radius, with values monotonically decreasing from ∼4 in the nuclear region to nearly zero toward the edge of the optical disk. Although the tightness of this dependence is in part attributable to resolution effects, the result is consistent with the presence of a large-scale distribution of diffuse dust having a face-on optical depth that decreases with radius and that dominates over the more localized variations in opacity between the arm and interarm regions. We also find a trend for the FIR/UV ratio of taking on higher values in the regions of diffuse interarm emission than in the spiral-arm regions, at a given radius. This is interpreted quantitatively in terms of the escape probability of UV photons from spiral arms and their subsequent scattering in the interarm regions, and in terms of the larger relative contribution of optical photons to the heating of the dust in the interarm regions.

Original languageEnglish
Pages (from-to)L75-L78
JournalAstrophysical Journal
Volume619
Issue number1 II
DOIs
Publication statusPublished - 2005 Jan 20

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comparative study
spatial distribution
radii
dust
pixels
galaxies
tightness
Infrared Space Observatory (ISO)
optical disks
photons
opacity
optical thickness
escape
pixel
trends
heating
scattering
optical depth
observatory

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Popescu, C. C., Tuffs, R. J., Madore, B. F., Gil De Paz, A., Völk, H. J., Barlow, T., ... Wyder, T. K. (2005). A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101. Astrophysical Journal, 619(1 II), L75-L78. https://doi.org/10.1086/422991
Popescu, Cristina C. ; Tuffs, Richard J. ; Madore, Barry F. ; Gil De Paz, Armando ; Völk, Heinrich J. ; Barlow, Tom ; Bianchi, Luciana ; Byun, Yong Ik ; Donas, Jose ; Forster, Karl ; Friedman, Peter G. ; Heckman, Timothy M. ; Jelinsky, Patrick N. ; Lee, Young Wook ; Malina, Roger F. ; Martin, D. Christopher ; Milliard, Bruno ; Morrissey, Patrick ; Neff, Susan G. ; Rich, R. Michael ; Schiminovich, David ; Siegmund, Oswald H.W. ; Small, Todd ; Szalay, Alex S. ; Welsh, Barry Y. ; Wyder, Ted K. / A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101. In: Astrophysical Journal. 2005 ; Vol. 619, No. 1 II. pp. L75-L78.
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abstract = "The total ultraviolet (UV) flux (from 1412 to 2718 {\AA}) of M101 is compared on a pixel-to-pixel basis with the total far-infrared (FIR) flux (from 60 to 170 μm) using the maps of the galaxy taken by the Galaxy Evolution Explorer (GALEX) in the near-UV and far-UV and by the Infrared Space Observatory (ISO) at 60, 100, and 170 μm. The main result of this investigation is the discovery of a tight dependence of the FIR/UV ratio on radius, with values monotonically decreasing from ∼4 in the nuclear region to nearly zero toward the edge of the optical disk. Although the tightness of this dependence is in part attributable to resolution effects, the result is consistent with the presence of a large-scale distribution of diffuse dust having a face-on optical depth that decreases with radius and that dominates over the more localized variations in opacity between the arm and interarm regions. We also find a trend for the FIR/UV ratio of taking on higher values in the regions of diffuse interarm emission than in the spiral-arm regions, at a given radius. This is interpreted quantitatively in terms of the escape probability of UV photons from spiral arms and their subsequent scattering in the interarm regions, and in terms of the larger relative contribution of optical photons to the heating of the dust in the interarm regions.",
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Popescu, CC, Tuffs, RJ, Madore, BF, Gil De Paz, A, Völk, HJ, Barlow, T, Bianchi, L, Byun, YI, Donas, J, Forster, K, Friedman, PG, Heckman, TM, Jelinsky, PN, Lee, YW, Malina, RF, Martin, DC, Milliard, B, Morrissey, P, Neff, SG, Rich, RM, Schiminovich, D, Siegmund, OHW, Small, T, Szalay, AS, Welsh, BY & Wyder, TK 2005, 'A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101', Astrophysical Journal, vol. 619, no. 1 II, pp. L75-L78. https://doi.org/10.1086/422991

A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101. / Popescu, Cristina C.; Tuffs, Richard J.; Madore, Barry F.; Gil De Paz, Armando; Völk, Heinrich J.; Barlow, Tom; Bianchi, Luciana; Byun, Yong Ik; Donas, Jose; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young Wook; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Rich, R. Michael; 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, p. L75-L78.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101

AU - Popescu, Cristina C.

AU - Tuffs, Richard J.

AU - Madore, Barry F.

AU - Gil De Paz, Armando

AU - Völk, Heinrich J.

AU - Barlow, Tom

AU - Bianchi, Luciana

AU - Byun, Yong Ik

AU - Donas, Jose

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Heckman, Timothy M.

AU - Jelinsky, Patrick N.

AU - Lee, Young Wook

AU - Malina, Roger F.

AU - Martin, D. Christopher

AU - Milliard, Bruno

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Rich, R. Michael

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 - The total ultraviolet (UV) flux (from 1412 to 2718 Å) of M101 is compared on a pixel-to-pixel basis with the total far-infrared (FIR) flux (from 60 to 170 μm) using the maps of the galaxy taken by the Galaxy Evolution Explorer (GALEX) in the near-UV and far-UV and by the Infrared Space Observatory (ISO) at 60, 100, and 170 μm. The main result of this investigation is the discovery of a tight dependence of the FIR/UV ratio on radius, with values monotonically decreasing from ∼4 in the nuclear region to nearly zero toward the edge of the optical disk. Although the tightness of this dependence is in part attributable to resolution effects, the result is consistent with the presence of a large-scale distribution of diffuse dust having a face-on optical depth that decreases with radius and that dominates over the more localized variations in opacity between the arm and interarm regions. We also find a trend for the FIR/UV ratio of taking on higher values in the regions of diffuse interarm emission than in the spiral-arm regions, at a given radius. This is interpreted quantitatively in terms of the escape probability of UV photons from spiral arms and their subsequent scattering in the interarm regions, and in terms of the larger relative contribution of optical photons to the heating of the dust in the interarm regions.

AB - The total ultraviolet (UV) flux (from 1412 to 2718 Å) of M101 is compared on a pixel-to-pixel basis with the total far-infrared (FIR) flux (from 60 to 170 μm) using the maps of the galaxy taken by the Galaxy Evolution Explorer (GALEX) in the near-UV and far-UV and by the Infrared Space Observatory (ISO) at 60, 100, and 170 μm. The main result of this investigation is the discovery of a tight dependence of the FIR/UV ratio on radius, with values monotonically decreasing from ∼4 in the nuclear region to nearly zero toward the edge of the optical disk. Although the tightness of this dependence is in part attributable to resolution effects, the result is consistent with the presence of a large-scale distribution of diffuse dust having a face-on optical depth that decreases with radius and that dominates over the more localized variations in opacity between the arm and interarm regions. We also find a trend for the FIR/UV ratio of taking on higher values in the regions of diffuse interarm emission than in the spiral-arm regions, at a given radius. This is interpreted quantitatively in terms of the escape probability of UV photons from spiral arms and their subsequent scattering in the interarm regions, and in terms of the larger relative contribution of optical photons to the heating of the dust in the interarm regions.

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Popescu CC, Tuffs RJ, Madore BF, Gil De Paz A, Völk HJ, Barlow T et al. A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101. Astrophysical Journal. 2005 Jan 20;619(1 II):L75-L78. https://doi.org/10.1086/422991