| Texto completo | |
| Autor(es): |
Torres-Flores, S.
[1, 2, 3, 4]
;
Epinat, B.
[3, 4, 5, 6]
;
Amram, P.
[3, 4]
;
Plana, H.
[7, 3, 4]
;
Mendes de Oliveira, C.
[2]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ La Serena, Dept Fis, La Serena - Chile
[2] Univ Sao Paulo, Dept Astron, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
[3] CNRS, F-13388 Marseille 13 - France
[4] Univ Aix Marseille 1, Lab Astrophys Marseille, F-13388 Marseille 13 - France
[5] Univ Toulouse, Inst Rech Astrophys & Planetol, F-31400 Toulouse - France
[6] CNRS, F-31400 Toulouse - France
[7] Univ Estadual Santa Cruz, Lab Astrofis Teor & Observac, Ilheus - Brazil
Número total de Afiliações: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 416, n. 3, p. 1936-1948, SEP 2011. |
| Citações Web of Science: | 33 |
| Resumo | |
We studied, for the first time, the near-infrared, stellar and baryonic Tully-Fisher relations for a sample of field galaxies taken from a homogeneous Fabry-Perot sample of galaxies {[}the Gassendi HAlpha survey of SPirals (GHASP) survey]. The main advantage of GHASP over other samples is that the maximum rotational velocities were estimated from 2D velocity fields, avoiding assumptions about the inclination and position angle of the galaxies. By combining these data with 2MASS photometry, optical colours, HI masses and different mass-to-light ratio estimators, we found a slope of 4.48 +/- 0.38 and 3.64 +/- 0.28 for the stellar and baryonic Tully-Fisher relation, respectively. We found that these values do not change significantly when different mass-to-light ratio recipes were used. We also point out, for the first time, that the rising rotation curves as well as asymmetric rotation curves show a larger dispersion in the Tully-Fisher relation than the flat ones or the symmetric ones. Using the baryonic mass and the optical radius of galaxies, we found that the surface baryonic mass density is almost constant for all the galaxies of this sample. In this study we also emphasize the presence of a break in the NIR Tully-Fisher relation at M(H,K) similar to -20 and we confirm that late-type galaxies present higher total-to-baryonic mass ratios than early-type spirals, suggesting that supernova feedback is actually an important issue in late-type spirals. Due to the well-defined sample selection criteria and the homogeneity of the data analysis, the Tully-Fisher relation for GHASP galaxies can be used as a reference for the study of this relation in other environments and at higher redshifts. (AU) | |
| Processo FAPESP: | 06/56213-9 - Nova física no espaço: formação e evolução de estruturas no universo |
| Beneficiário: | Claudia Lucia Mendes de Oliveira |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 07/07973-3 - A cinemática interna de galáxias em grupos compactos de Hickson |
| Beneficiário: | Sergio Patricio Torres Flores |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |