A 0.8-2.4 μm spectral atlas of active galactic nuclei

By R. Riffel, A. Rodríguez-Ardila, M. Pastoriza. 2006

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Aims. We present a near-infrared spectral atlas of 47 active galactic nuclei (AGN) of all degrees of activity in the wavelength interval of 0.8-2.4 � m, including the fluxes of the observed emission lines. We ana lyze the spectroscopic properties of the continuum and emission line spectra of the sources. Methods. In order to exclude aperture and seeing effects we used near-infrared spectroscopy in the short cross-dispersed mode (SXD, 0.8−2.4� m), taking the JHK-bands spectra simultaneously. Results. We present the most extensive NIR spectral atlas of AGN to date. This atlas offers a suitable database for studying the continuum and line emission properties of these objects in a region full of interesting features. The shape of the continuum of QSOs and Sy 1’s are similar, being essentially flat in the H and K bands, while a strong vari ation is found in the J band. In Seyfert 2 galaxies, the contin uum in the Fλ×λ space smoothly decreases in flux from 1.2� m redwards in almost all sources. In J, it smoothly rises bluewards in some sources, while in others a small decrease in flux is observed. The spectra are do minated by strong emission features of Hi, Hei, Heii, [Siii] and by conspicuous forbidden lines of low and high ionization species. Molecular lines of H2 are common features of most objects. The absence of Oi and Feii lines in Seyfert 2 galaxies and the smaller FWHM of these lines relative to that of Hi in the Seyfert 1 give observational support to the fact that they are formed in the outermost portion of the broad-line region. The[Pii] and coronal lines are detected for all degrees of activity. The [Feii] 12570A/16436A line ratio becomes a reliable reddening indicator for the narrow-line region of Seyfert galaxies.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/6e092d269978f1e06c3de2539298d6cf7fe3c853

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Citations in the corpus

DETERMINING STAR FORMATION RATES FOR INFRARED GALAXIES (2008, methodology): “However, as a key input to the templates, we used the spectrum from 0.8 to 2.4µm of the lightly obscured LIRG NGC 1614 (AlonsoHerrero et al. 2001), obtained with a spectrograph that maintains the relative normalization of the spectral segments (Riffel et al. 2006).”
PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy (2017, background): “In Figure 10 we show a NIR spectrum of NLS1 galaxy Ark 564 (Riffel et al. 2006) along with the FIRE spectrum of PS16dtm.”
THE MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES. II. EXTREME PHYSICAL CONDITIONS AND THEIR EFFECTS ON THE Xco FACTOR (2012, background): “NGC7469 This is a well-studied Sy 1 spiral galaxy whose AGN is surrounded by a nearly com- plete ring of powerful starburst activity contributing ∼2/3 of its LIR (Genzel et al. 1995; Riffel et al. 2006 and references therein).”