Tese
A emissão do gás da região de linhas estreitas em galáxias Seyfert próximas
Fecha
2017-12-21Autor
Santos, Izabel Cristina Freitas dos
Institución
Resumen
The Active Galactic Nuclei (AGNs) show high luminosities ( 109 L ) and emit energy from
the accretion disk around the central Supermassive Black Hole (SMBH). The Narrow Line
Region (NLR) is the only AGN structure spatially resolved in the optical by current telescopes.
It shows extensions typically of a few hundred of parsecs and is formed by low density
gaseous clouds (≈10³cm⁻³). In this work, we used data obtained with the Integral Field
Unit (IFU) of the Gemini Multi-Object Spectrograph (GMOS) instrument of the Gemini North
telescope, to study the gas distribution, excitation and kinematics in the NLR of five nearby
Seyfert galaxies (Mrk 6, Mrk 79, Mrk 348, Mrk 607 e Mrk 1058). The data cover the inner
3:005 5:000 – corresponding to physical scales in the range (0,6 to 0,9) (1,5 to 2,2) kpc2 at
the galaxy – at a spatial resolution ranging from 110 to 280 pc with a spectral coverage of
4300 – 7100 Å and spectral resolution of ≈ 90 kms⁻¹. We fitted the line profiles at each
spaxel by Gaussian curves using adapted versions of the PROFIT routine and constructed
maps for the flux distributions, kinematics and intensity line-ratios for the galaxies of our
sample. The gas excitation is Seyfert-like over the whole field-of-view in all galaxies. However,
we can see ionization gradients of the gas that are correlated with the highest velocities
dispersion regions and we have interpreted them as being due to nuclear outflows that reach
line-of-sight velocities up to ≈200 kms⁻¹. Bipolar outflows are observed in Mrk 348
and Mrk 79, while in Mrk 1058 only the blueshifted part is clearly observed.