| Full text | |
| Author(s): |
Martins, Lucimara P.
[1]
;
Rodriguez-Ardila, Alberto
[2]
;
de Souza, Ronaldo
[3]
;
Gruenwald, Ruth
[3]
Total Authors: 4
|
| Affiliation: | [1] NAT Univ Cruzeiro Sul, Sao Paulo - Brazil
[2] Lab Nacl Astrofis MCT, BR-37504364 Itajuba, MG - Brazil
[3] Univ Sao Paulo, Inst Astron & Geofis, BR-1226 Sao Paulo - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 406, n. 4, p. 2168-2184, AUG 21 2010. |
| Web of Science Citations: | 9 |
| Abstract | |
We report the first simultaneous zJHK spectroscopy on the archetypical Seyfert 2 galaxy NGC 1068 covering the wavelength region 0.9-2.4 mu m. The slit, aligned in the north-south direction and centred in the optical nucleus, maps a region 300 pc in radius at subarcsec resolution, with a spectral resolving power of 360 km s-1. This configuration allows us to study the physical properties of the nuclear gas including that of the north side of the ionization cone, map the strong excess of continuum emission in the K band and attributed to dust and study the variations, both in flux and profile, in the emission lines. Our results show the following. (1) Mid- to low-ionization emission lines are split into two components, whose relative strengths vary with the position along the slit and seem to be correlated with the jet. (2) The coronal lines are single-peaked and are detected only in the central few hundred of pc from the nucleus. (3) The absorption lines indicate the presence of intermediate age stellar population, which might be a significant contributor to the continuum in the near-IR spectra. (4) Through some simple photoionization models we find photoionization as the main mechanism powering the emitting gas. (5) Calculations using stellar features point to a mass concentration inside the 100-200 pc of about 1010 M(circle dot). (AU) | |
| FAPESP's process: | 07/04316-1 - Tracers of star formation in the near-infrared |
| Grantee: | Lucimara Pires Martins |
| Support Opportunities: | Scholarships abroad - Research |