An evolutionary disc model of the edge-on galaxy NGC 5907
| dc.creator | Just, A. | |
| dc.creator | Moellenhoff, C. | |
| dc.creator | Borch, A. | |
| dc.date | 2006-08-09 | |
| dc.date | 2006-08-29 | |
| dc.date.accessioned | 2026-07-07T07:19:19Z | |
| dc.date.available | 2026-07-07T07:19:19Z | |
| dc.description | We present a physical model that explains the two disparate observational facts: 1) the exponential vertical disc structure in the optical and NIR of the non-obscured part of the stellar disc and 2) the enhanced FIR/submm luminosity by about a factor of four near the obscured mid-plane, which requires additional dust and also stellar light to heat the dust component. We use multi-band photometry in U, B, V, R, and I- band combined with radiative transfer through a dust component to fit simultaneously the vertical surface-brightness and colour index profiles in all bands adopting a reasonable star formation history and dynamical heating function. The final disc model reproduces the surface-brightness profiles in all bands with a moderately declining star formation rate and a slowly starting heating function for young stars. The total dust mass is 57 million solar masses as required from the FIR/submm measurements. Without a recent star burst we find in the midplane an excess of 5.2-, 4.0-, and 3.0-times more stellar light in the U-, B-, and V-band, respectively. The corresponding stellar mass-to-light ratios are 0.91 in V- and 1.0 in R-band. The central face-on optical depth in V-band is 0.81 and the radial scale length of the dust is 40% larger than that of the stellar disc. Evolutionary disc models are a powerful method to understand the vertical structure of edge-on galaxies. Insights to the star formation history and the dynamical evolution of stellar discs can be gained. FIR/submm observations are necessary to restrict the parameter space for the models. | |
| dc.description | 17 pages, 12 figures (24 files), A&A in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0608196 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0608196 | |
| dc.identifier | Astron.Astrophys. 459 (2006) 703-716 | |
| dc.identifier | doi:10.1051/0004-6361:20065701 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/114584 | |
| dc.subject | Astrophysics | |
| dc.title | An evolutionary disc model of the edge-on galaxy NGC 5907 | |
| dc.type | text |