A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101
| dc.contributor.author | Gil De Paz, Armando | |
| dc.date.accessioned | 2023-06-20T11:10:31Z | |
| dc.date.available | 2023-06-20T11:10:31Z | |
| dc.date.issued | 2005-01-20 | |
| dc.description | © 2005. The American Astronomical Society. All rights reserved. Artículo firmado por 26 autores. GALEX is a NASA small explorer launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. | |
| dc.description.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. | |
| dc.description.department | Depto. de Física de la Tierra y Astrofísica | |
| dc.description.faculty | Fac. de Ciencias Físicas | |
| dc.description.refereed | TRUE | |
| dc.description.status | pub | |
| dc.eprint.id | https://eprints.ucm.es/id/eprint/36009 | |
| dc.identifier.citation | Baes, M., & Dejonghe, H. 2001, MNRAS, 326, 733 Bianchi, S., Ferrara, A., & Giovanardi, C. 1996, ApJ, 465, 127 Bianchi, L., et al. 2005, ApJ, 619, L71 Boissier, S., Boselli, A., Buat, V., Donas, J., & Milliard, B. 2004, A&A, 424, 465 Boissier, S., et al. 2005, ApJ, 619, L83 Bothun, G. D., & Rogers, C. 1992, AJ, 103, 1484 Buat, V., et al. 2005, ApJ, 619, L51 Ferrara, A., Bianchi, S., Cimatti, A., & Giovanardi, C. 1999, ApJS, 123, 437 Henyey, L. G., & Greenstein, J. L. 1941, ApJ, 93, 70 Laor, A., & Draine, B. T. 1993, ApJ, 402, 441 Lemke, D., et al. 1996, A&A, 315, L64 Martin, D. C., et al. 2005, ApJ, 619, L1 Misiriotis, A., Popescu, C. C., Tuffs, R. J., & Kylafis, N. D. 2001, A&A, 372, 775 Morrissey, P., et al. 2005, ApJ, 619, L7 Popescu, C. C., Misiriotis A., Kylafis, N. D., Tuffs, R. J., & Fischera, J. 2000, A&A, 362, 138 Popescu, C. C., & Tuffs, R. J. 2002, MNRAS, 335, L41 Popescu, C. C., Tuffs, R. J., Völk, H. J., Pierini, D., & Madore, B. F. 2002, ApJ, 567, 221 Sofue, Y., Tutui, Y., Honma, M., & Tomita, A. 1997, AJ, 114, 2428 Thilker, D., et al. 2005a, ApJ, 619, L67 ———. 2005b, ApJ, 619, L79 Tuffs, R. J., & Gabriel, C. 2003, A&A, 410, 1075 Tuffs, R. J., & Popescu, C. C. 2003, in Exploiting the ISO Data Archive: Infrared Astronomy in the Internet Age, ed. C. Gry et al. (ESA SP-511; Noordwijk: ESA), 239 Tuffs, R. J., Popescu, C. C., Völk, H. J., Kylafis, N. D., & Dopita, M. A. 2004, A&A, 419, 821 Tuffs, R. J., et al. 2002, ApJS, 139, 37 (erratum 140, 609) Xu, C., & Buat, V. 1995, A&A, 293, L65 | |
| dc.identifier.doi | 10.1086/422991 | |
| dc.identifier.issn | 0004-637X | |
| dc.identifier.officialurl | http://dx.doi.org/10.1086/422991 | |
| dc.identifier.relatedurl | http://iopscience.iop.org/ | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14352/51795 | |
| dc.issue.number | 1 | |
| dc.journal.title | Astrophysical journal | |
| dc.language.iso | eng | |
| dc.page.final | L78 | |
| dc.page.initial | L75 | |
| dc.publisher | American Astronomical Society | |
| dc.rights.accessRights | open access | |
| dc.subject.cdu | 52 | |
| dc.subject.keyword | Spectral energy-distribution | |
| dc.subject.keyword | Virgo cluster galaxies | |
| dc.subject.keyword | Spiral galaxies | |
| dc.subject.keyword | Stellar light | |
| dc.subject.keyword | Dust | |
| dc.subject.keyword | Extinction | |
| dc.subject.keyword | Attenuation | |
| dc.subject.keyword | Photometry | |
| dc.subject.keyword | Radiation | |
| dc.subject.keyword | Emission | |
| dc.subject.ucm | Astrofísica | |
| dc.subject.ucm | Astronomía (Física) | |
| dc.title | A comparative study of the spatial distribution of ultraviolet and far-infrared fluxes from M101 | |
| dc.type | journal article | |
| dc.volume.number | 619 | |
| dspace.entity.type | Publication | |
| relation.isAuthorOfPublication | 7fb1c66f-848a-4aa3-a350-88c633947323 | |
| relation.isAuthorOfPublication.latestForDiscovery | 7fb1c66f-848a-4aa3-a350-88c633947323 |
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