Zobrazeno 1 - 10
of 601
pro vyhledávání: '"Viegas, S"'
Autor:
Ferland, G., Binette, L., Contini, M., Harrington, J., Kallman, T., Netzer, H., Péquignot, D., Raymond, J., Rubin, R., Shields, G., Sutherland, R., Viegas, S.
We present the results of a meeting on numerical simulations of ionized nebulae held at the University of Kentucky in conjunction with the celebration of the 70th birthdays of Profs. Donald Osterbrock and Michael Seaton.
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Externí odkaz:
http://arxiv.org/abs/1603.08902
Autor:
Lamon, L., Doyle, J., Paini, A., Moeller, R., Viegas, S., Cubadda, F., Hoet, P., van Nieuwenhuyse, A., Louro, H., Dusinska, M, Galea, K.S., Canham, R., Martins, C., Gama, A., Teófilo, V., Diniz‐da‐Costa, M., João Silva, M., Ventura, C., Alvito, P., El Yamani, N.
Publikováno v:
EFSA Supporting Publications; Jul2024, Vol. 21 Issue 7, p1-364, 364p
Akademický článek
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Publikováno v:
Astrophys.J.653:1098-1114,2006
Mid-resolution spectra are used to deduce the size and kinematics of the coronal gas in a sample of Seyfert galaxies by means of observations of the [FeXI], [FeX], [FeVII], [SiVI] and [SiVII] lines. These coronal lines (CL) extend from the unresolved
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609635
Publikováno v:
Mon.Not.Roy.Astron.Soc.364:674-682,2005
When analysing HII regions, a possible source of systematic error on empirically derived physical quantities is the limited size of the slit used for the observations. A grid of photoionization models was built through the Aangaba code varying the io
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509345
Publikováno v:
Mon.Not.Roy.Astron.Soc. 357 (2005) 220-234
We present the first spectroscopic observations in the interval 0.8-4.0 microns, complemented with HST/UV and optical spectroscopy, of the narrow line Seyfert 1 galaxy Mrk766. The NIR spectrum is characterized by permitted lines of HI, HeI, HeII and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412633
VLT and NTT spectra are used to examine the nuclear and extended coronal line emission in a sample of well-known Seyfert 1 and 2 galaxies. The excellent spatial resolution obtained with VLT allowed us to map [SiVI] 1.963 $\mu$m and [SiVII] 2.48 $\mu$
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406648
Publikováno v:
Mon.Not.Roy.Astron.Soc. 348 (2004) 1065
We discuss the different physical processes contributing to the infrared continuum of AGN, assuming that both photoionization from the active center and shocks ionize and heat the gas and dust contained in an ensemble of clouds surrounding the nucleu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0311447
Publikováno v:
Mon.Not.Roy.Astron.Soc.346:37,2003
The correlation between the soft X-ray and near infrared emission from AGN is analysed using composite models by the code SUMA. We find new evidences for differences in ranges of parameters which characterize the NLR of Seyfert galaxies and LINERs. R
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308070
Autor:
Rodriguez-Ardila, A., Viegas, S.
We report the detection of the 3.3 mu Polycyclic Aromatic Hydrocarbon (PAH) feature in two Seyfert 1 galaxies - NGC 3227 and Mrk 766, and one QSO - Mrk 478, observed with SpeX at IRTF at a spectral resolution not previously attained for this type of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302327