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Radial distribution of dust, stars, gas, and star-formation rate in DustPedia face-on galaxies

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Abstract
Aims. The purpose of this work is the characterization of the radial distribution of dust, stars, gas, and star-formation rate (SFR) in a sub-sample of 18 face-on spiral galaxies extracted from the DustPedia sample. Methods. This study is performed by exploiting the multi-wavelength DustPedia database, from ultraviolet (UV) to sub-millimeter bands, in addition to molecular ((CO)-C-12) and atomic (HI) gas maps and metallicity abundance information available in the literature. We fitted the surface-brightness profiles of the tracers of dust and stars, the mass surface-density profiles of dust, stars, molecular gas, and total gas, and the SFR surface-density profiles with an exponential curve and derived their scale-lengths. We also developed a method to solve for the CO-to-H-2 conversion factor (alpha(CO)) per galaxy by using dust- and gas-mass profiles. Results. Although each galaxy has its own peculiar behavior, we identified a common trend of the exponential scale-lengths versus wavelength. On average, the scale-lengths normalized to the B-band 25 mag/arcsec(2) radius decrease from UV to 70 mu m, from 0.4 to 0.2, and then increase back up to similar to 0.3 at 500 microns. The main result is that, on average, the dust-mass surface-density scale-length is about 1.8 times the stellar one derived from IRAC data and the 3.6 mu m surface brightness, and close to that in the UV. We found a mild dependence of the scale-lengths on the Hubble stage T: the scale-lengths of the Herschel bands and the 3.6 mu m scale-length tend to increase from earlier to later types, the scale-length at 70 mu m tends to be smaller than that at longer sub-mm wavelength with ratios between longer sub-mm wavelengths and 70 mu m that decrease with increasing T. The scale-length ratio of SFR and stars shows a weak increasing trend towards later types. Our alpha(CO) determinations are in the range (0.3-9) M-circle dot pc(-2) (K km s(-1))(-1), almost invariant by using a fixed dust-to-gas ratio mass (DGR) or a DGR depending on metallicity gradient.
Keywords
dust, extinction, ISM: molecules, galaxies: ISM, galaxies: spiral, galaxies: structure, galaxies: photometry, DISK-DOMINATED GALAXIES, POLYCYCLIC AROMATIC-HYDROCARBONS, INFRARED SURFACE PHOTOMETRY, GIANT MOLECULAR CLOUDS, NEARBY SPIRAL GALAXIES, DIGITAL SKY SURVEY, ARRAY CAMERA IRAC, STELLAR POPULATIONS, FORMING GALAXIES, COLD DUST

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Chicago
Casasola, V, LP Cassarà, S Bianchi, Sam Verstocken, E Xilouris, L Magrini, MWL Smith, et al. 2017. “Radial Distribution of Dust, Stars, Gas, and Star-formation Rate in DustPedia Face-on Galaxies.” Astronomy & Astrophysics 605.
APA
Casasola, V., Cassarà, L., Bianchi, S., Verstocken, S., Xilouris, E., Magrini, L., Smith, M., et al. (2017). Radial distribution of dust, stars, gas, and star-formation rate in DustPedia face-on galaxies. ASTRONOMY & ASTROPHYSICS, 605.
Vancouver
1.
Casasola V, Cassarà L, Bianchi S, Verstocken S, Xilouris E, Magrini L, et al. Radial distribution of dust, stars, gas, and star-formation rate in DustPedia face-on galaxies. ASTRONOMY & ASTROPHYSICS. 2017;605.
MLA
Casasola, V, LP Cassarà, S Bianchi, et al. “Radial Distribution of Dust, Stars, Gas, and Star-formation Rate in DustPedia Face-on Galaxies.” ASTRONOMY & ASTROPHYSICS 605 (2017): n. pag. Print.
@article{8538452,
  abstract     = {Aims. The purpose of this work is the characterization of the radial distribution of dust, stars, gas, and star-formation rate (SFR) in a sub-sample of 18 face-on spiral galaxies extracted from the DustPedia sample. 
Methods. This study is performed by exploiting the multi-wavelength DustPedia database, from ultraviolet (UV) to sub-millimeter bands, in addition to molecular ((CO)-C-12) and atomic (HI) gas maps and metallicity abundance information available in the literature. We fitted the surface-brightness profiles of the tracers of dust and stars, the mass surface-density profiles of dust, stars, molecular gas, and total gas, and the SFR surface-density profiles with an exponential curve and derived their scale-lengths. We also developed a method to solve for the CO-to-H-2 conversion factor (alpha(CO)) per galaxy by using dust- and gas-mass profiles. 
Results. Although each galaxy has its own peculiar behavior, we identified a common trend of the exponential scale-lengths versus wavelength. On average, the scale-lengths normalized to the B-band 25 mag/arcsec(2) radius decrease from UV to 70 mu m, from 0.4 to 0.2, and then increase back up to similar to 0.3 at 500 microns. The main result is that, on average, the dust-mass surface-density scale-length is about 1.8 times the stellar one derived from IRAC data and the 3.6 mu m surface brightness, and close to that in the UV. We found a mild dependence of the scale-lengths on the Hubble stage T: the scale-lengths of the Herschel bands and the 3.6 mu m scale-length tend to increase from earlier to later types, the scale-length at 70 mu m tends to be smaller than that at longer sub-mm wavelength with ratios between longer sub-mm wavelengths and 70 mu m that decrease with increasing T. The scale-length ratio of SFR and stars shows a weak increasing trend towards later types. Our alpha(CO) determinations are in the range (0.3-9) M-circle dot pc(-2) (K km s(-1))(-1), almost invariant by using a fixed dust-to-gas ratio mass (DGR) or a DGR depending on metallicity gradient.},
  articleno    = {A18},
  author       = {Casasola, V and Cassar{\`a}, LP and Bianchi, S and Verstocken, Sam and Xilouris, E and Magrini, L and Smith, MWL and De Looze, Ilse and Galametz, M and Madden, SC and Baes, Maarten and Clark, C and Davies, J and De Vis, P and Evans, R and Fritz, J and Galliano, F and Jones, AP and Mosenkov, Aleksandr and Viaene, S{\'e}bastien and Ysard, N},
  issn         = {1432-0746},
  journal      = {ASTRONOMY \& ASTROPHYSICS},
  keyword      = {dust,extinction,ISM: molecules,galaxies: ISM,galaxies: spiral,galaxies: structure,galaxies: photometry,DISK-DOMINATED GALAXIES,POLYCYCLIC AROMATIC-HYDROCARBONS,INFRARED SURFACE PHOTOMETRY,GIANT MOLECULAR CLOUDS,NEARBY SPIRAL GALAXIES,DIGITAL SKY SURVEY,ARRAY CAMERA IRAC,STELLAR POPULATIONS,FORMING GALAXIES,COLD DUST},
  language     = {eng},
  pages        = {33},
  title        = {Radial distribution of dust, stars, gas, and star-formation rate in DustPedia face-on galaxies},
  url          = {http://dx.doi.org/10.1051/0004-6361/201731020},
  volume       = {605},
  year         = {2017},
}

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