Decleir, M;
De Looze, I;
Boquien, M;
Baes, M;
Verstocken, S;
Calzetti, D;
Ciesla, L;
... Page, M; + view all
(2019)
Revealing the dust attenuation properties on resolved scales in NGC 628 with SWIFT UVOT data.
Monthly Notices of the Royal Astronomical Society
, 486
(1)
pp. 743-767.
10.1093/mnras/stz805.
Preview |
Text
Page_Revealing the dust attenuation properties on resolved scales in NGC 628 with SWIFT UVOT data_VoR.pdf - Published Version Download (20MB) | Preview |
Abstract
Understanding how dust attenuation laws vary between and within galaxies is a key question if we want to reliably measure the physical properties of galaxies at both global and local scales. To shed new light on this question, we present a detailed study of the slope and bump strength of the attenuation law in the nearby spiral galaxy NGC 628 at the resolved spatial scale of 325 pc. To do so, we have modelled a broad multiwavelength data set from the ultraviolet (UV) to the infrared (IR) with the state-of-the-art SED fitting code CIGALE, including SWIFT UVOT data for which we have developed a new optimized reduction pipeline. We find that the median dust attenuation curve of NGC 628 is fairly steep, but not as steep as the SMC curve, and has a sub-MW-type UV bump. We observe intriguing variations within the galaxy, with regions of high AV exhibiting a shallower attenuation curve. We argue that the flattening of the curve is due to a dominance of absorption over scattering events at higher AV. No trend between the bump strength and the IRAC 8.0 μm emission was found. However, this does not necessarily rule out polycyclic aromatic hydrocarbons as the main contributors to the UV bump.
| Type: | Article |
|---|---|
| Title: | Revealing the dust attenuation properties on resolved scales in NGC 628 with SWIFT UVOT data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz805 |
| Publisher version: | https://doi.org/10.1093/mnras/stz805 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | dust, extinction, galaxies: individual: NGC 628, galaxies: ISM; techniques: image processing; ultraviolet: ISM |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10074463 |
Archive Staff Only
 |
View Item |
