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2005MNRAS.356..270C - Mon. Not. R. Astron. Soc., 356, 270-294 (2005/January-1)
The stellar populations of low-luminosity active galactic nuclei - III. Spatially resolved spectral properties.
CID FERNANDES R., GONZALEZ-DELGADO R.M., STORCHI-BERGMANN T., PIRES M.L. and SCHMITT H.
Abstract (from CDS):
This study reveals that young-TOs also differ from old-TOs and old-LINERs in terms of the spatial distributions of their stellar populations and dust. Specifically, our main findings are as follows. (i) Significant stellar population gradients are found almost exclusively in young-TOs. (ii) The intermediate age population of young-TOs, although heavily concentrated in the nucleus, reaches distances of up to a few hundred pc from the nucleus. Nevertheless, the half width at half-maximum of its brightness profile is more typically 100 pc or less. (iii) Objects with predominantly old stellar populations present spatially homogeneous spectra, be they LINERs or TOs. (iv) Young-TOs have much more dust in their central regions than other LLAGNs. (v) The B-band luminosities of the central ≲1 Gyr population in young-TOs are within an order of magnitude of MB=-15, implying masses of the order of ∼107-108 M☉. This population was 10-100 times more luminous in its formation epoch, at which time young massive stars would have completely outshone any active nucleus, unless the AGN too was brighter in the past.
Abstract Copyright: 2004 RAS
Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert - galaxies: statistics - galaxies: stellar content
CDS comments: p. 275, NGC 305 is probably a misprint for NGC 315.
Simbad objects: 52
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