Near IR spectroscopy of active galactic nuclei

Boisson, C.; Coupé, S.; Cuby, Jean-Gabriel; Joly, M.; Ward, M. J.

doi:10.1051/0004-6361:20021449

Cited by 9 publications

(17 citation statements)

References 35 publications

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“…1), which is a clear signature of type 1 activity. Furthermore, in our previous near-IR study of AGN, we found that the spectrum of NGC 2992 closely resembles Seyfert 1s (Boisson et al 2002). Despite its strong interaction with NGC 2993, NGC 2992 appears to be the oldest galaxy in our present sample.…”

Section: Discussionsupporting

confidence: 54%

Stellar populations in Active Galactic Nuclei III

Boisson¹,

Joly²,

Pelat³

et al. 2004

A&A

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Abstract. In this paper we apply the stellar population synthesis method previously described in Boisson et al. (2000) to five more AGN. The analysis of these new data strengthen our previous conclusions: i) homogeneity of the stellar population within a class of nuclear activity regardless of the morphological type of the host galaxy; ii) populations within the nuclear regions of LINERs and Seyfert 2s are different: LINERs have a very old metal-rich population while in the Seyfert 2s a contribution of a weak burst of star formation is observed together with the old high metallicity component; iii) in the circum-nuclar region (200 pc ≤ D ≤ 1 kpc) of all the active galaxies in our sample, except for NGC 2992, we detect an old burst of star formation (0.2−1 Gyr),which is contrary to what is observed in normal galaxies. We note that the broad OIλ8446 Å emission line detected in the spectrum of the nucleus of NGC 2992 confirms its classification as a Seyfert 1.

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Section: Discussionsupporting

confidence: 54%

Stellar populations in Active Galactic Nuclei III

Boisson¹,

Joly²,

Pelat³

et al. 2004

A&A

Self Cite

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“…Most of the previous work at NIR was focused on either active galactic nuclei (AGNs) or objects with very strong star formation, including recent surveys of ultra-luminous infrared galaxies (Goldader et al 1995;Murphy et al 1999Murphy et al , 2001Burston et al 2001), luminous infrared galaxies (Goldader et al 1997;Reunanen et al 2007), starbursts (Engelbracht 1997;Coziol et al 2001), Seyfert galaxies (Ivanov et al 2000;Sosa-Brito et al 2001;Reunanen et al 2002;Boisson et al 2002), LINERs (Larkin et al 1998;Alonso-Herrero et al 2000;Sosa-Brito et al 2001), and interacting galaxies (Vanzi & Rieke 1997;Vanzi et al 1998). …”

Section: Introductionmentioning

confidence: 99%

Early-type galaxies in the near-infrared: 1.5–2.4 $\mu{\rm m}$ spectroscopy

Cesetti

Ivanov

Morelli

et al. 2009

A&A

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Context. Near-infrared (hereafter NIR) data may provide complementary information to the traditional optical population synthesis analysis of unresolved stellar populations because the spectral energy distribution of the galaxies in the 1-2.5 μm range is dominated by different types of stars than at optical wavelengths. Furthermore, NIR data are less affected by dust absorption and hence could constrain the stellar populations in dust-obscured galaxies. Aims. We attempt to develop observational constraints on the stellar populations of unresolved stellar systems in the NIR. Methods. To achieve this goal, we require benchmark NIR spectra of "simple" early-type galaxies, to test and calibrate the outputs of population synthesis models. We obtained low-resolution (R ∼ 1000) long-slit spectra between 1.5 and 2.4 μm for 14 nearby earlytype galaxies using SofI at the ESO 3.5-m New Technology Telescope and higher resolution (R ∼ 3000) long-slit spectra, centered on Mgi at ∼1.51 μm for a heterogeneous sample of 5 nearby galaxies observed with ISAAC at Antu, one of the 8.2-m ESO Very Large Telescope. Results. We defined spectral indices corresponding to CO, Nai, Cai and Mgi absorption lines and measured their strengths in the galaxies spectrum. We defined a new global NIR metallicity index, suitable for abundance measurements in low-resolution spectra. Finally, we created an average-combined NIR spectrum of an early-type galaxy, from a homogeneous subset of our data set. Conclusions. The NIR galaxy spectra are similar to each other and some of the line index strengths correlate with both the iron abundance [Fe/H] and optical metal line indices of the galaxies. The data suggest that the NIR metal features, in combination with a hydrogen absorption feature, may break the age-metallicity degeneracy in a similar way the Mg and Fe features in the rest-frame optical wavelength range.

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“…The dynamically decoupled core could be the result of inflow of gas into the central regions of the galaxy via, for example, a past minor merger event. For our target, the majority of the stellar population is old and fairly homogeneous, not showing any variations with radius [2]. There is nevertheless indication of a series of previous star formation bursts [3].…”

Section: Pos(seyfert 2012)037mentioning

confidence: 99%

Probing the inner regions of MCG-06-30-15: the link between AGN activity and star formation

Raimundo¹,

Davies²,

Gandhi³

et al. 2013

Proceedings of Nuclei of Seyfert Galaxies and QSOs - Central Engine &Amp; Conditions of Star Formation — PoS(Seyfert 2012)

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In this contribution we present the first observations using integral field spectroscopy of the galaxy MCG-6-30-15, a Narrow Line Seyfert 1 galaxy with high black hole accretion rate and well studied X-ray properties. This galaxy is therefore a suitable test case to study the relation between black hole accretion and the properties of the inner regions of the host galaxy. We are able to remove the dominant spectral contribution of the broad brackett emission lines and trace the distribution and kinematics of the stars and also the [Fe II] line emission. We find that there is a counter-rotating stellar core with a radius r< 125 pc, which appears to be associated with the [Fe II] emission. Based on the presence of this emission line, we estimate the age of the central stellar population to be of order of 65 Myr. We show that the gas needed to fuel the black hole is, at most, only 1 per cent of that needed to form these stars.

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Near IR spectroscopy of active galactic nuclei

Cited by 9 publications

References 35 publications

Stellar populations in Active Galactic Nuclei III

Stellar populations in Active Galactic Nuclei III

Early-type galaxies in the near-infrared: 1.5–2.4 $\mu{\rm m}$ spectroscopy

Probing the inner regions of MCG-06-30-15: the link between AGN activity and star formation

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