The stellar populations of low-luminosity active galactic nuclei -: III.: Spatially resolved spectral properties

被引:67
作者
Cid Fernandes, R
González Delgado, RM
Storchi-Bergmann, T
Martins, LP
Schmitt, H
机构
[1] Univ Fed Santa Catarina, Dept Fis, CFM, BR-88040900 Florianopolis, SC, Brazil
[2] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
[3] Univ Fed Rio Grande Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
[4] Space Telescope Inst, Baltimore, MD 21218 USA
[5] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
关键词
galaxies : active; galaxies : nuclei; galaxies : Seyfert; galaxies : statistics; galaxies : stellar content;
D O I
10.1111/j.1365-2966.2004.08452.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In a recently completed survey of the stellar population properties of low-ionization nuclear emission-line regions (LINERs) and LINER/H II transition objects (TOs), we have identified a numerous class of galactic nuclei which stand out because of their conspicuous 10(8-9) yr populations, traced by high-order Balmer absorption lines and other stellar indices. These objects are called 'young-TOs', because they all have TO-like emission-line ratios. In this paper we extend this previous work, which concentrated on the nuclear properties, by investigating the radial variations of spectral properties in low-luminosity active galactic nuclei (LLAGNs). Our analysis is based on high signal-to-noise ratio (S/N) long-slit spectra in the 3500-5500 Angstrom interval for a sample of 47 galaxies. The data probe distances of typically up to 850 pc from the nucleus with a resolution of similar to100 pc (similar to1 arcsec) and S/N similar to 30. Stellar population gradients are mapped by the radial profiles of absorption-line equivalent widths and continuum colours along the slit. These variations are further analysed by means of a decomposition of each spectrum in terms of template galaxies representative of very young (less than or equal to10(7) yr), intermediate age (10(8-9) yr) and old (10(10) yr) stellar populations. 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 less than or similar to1 Gyr population in young-TOs are within an order of magnitude of M-B=-15, implying masses of the order of similar to10(7)-10(8) M-circle dot. 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.
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收藏
页码:270 / 294
页数:25
相关论文
共 23 条
[1]   Differential galaxy evolution in cluster and field galaxies at z ≈ 0.3 [J].
Balogh, ML ;
Morris, SL ;
Yee, HKC ;
Carlberg, RG ;
Ellingson, E .
ASTROPHYSICAL JOURNAL, 1999, 527 (01) :54-79
[2]   A search for ultraviolet emission from LINERs [J].
Barth, AJ ;
Ho, LC ;
Filippenko, AV ;
Sargent, WLW .
ASTROPHYSICAL JOURNAL, 1998, 496 (01) :133-+
[3]  
BOISSON C, 2000, ASTRON ASTROPHYS, V357, P857
[4]   Stellar population synthesis at the resolution of 2003 [J].
Bruzual, G ;
Charlot, S .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 344 (04) :1000-1028
[5]   THE RELATIONSHIP BETWEEN INFRARED, OPTICAL, AND ULTRAVIOLET EXTINCTION [J].
CARDELLI, JA ;
CLAYTON, GC ;
MATHIS, JS .
ASTROPHYSICAL JOURNAL, 1989, 345 (01) :245-256
[6]   The stellar populations of low-luminosity active galactic nuclei.: II.: Space telescope imaging spectrograph observations [J].
Delgado, RMG ;
Fernandes, RC ;
Pérez, E ;
Martins, LP ;
Storchi-Bergmann, T ;
Schmitt, H ;
Heckman, T ;
Leitherer, C .
ASTROPHYSICAL JOURNAL, 2004, 605 (01) :127-143
[7]   The star formation history of Seyfert 2 nuclei [J].
Fernandes, RC ;
Gu, Q ;
Melnick, J ;
Terlevich, E ;
Terlevich, R ;
Kunth, D ;
Lacerda, RR ;
Joguet, B .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 355 (01) :273-296
[8]   The stellar populations of low-luminosity active galactic nuclei.: I.: Ground-based observations [J].
Fernandes, RC ;
Delgado, RMG ;
Schmitt, H ;
Storchi-Bergmann, T ;
Martins, LP ;
Pérez, E ;
Heckman, T ;
Leitherer, C ;
Schaerer, D .
ASTROPHYSICAL JOURNAL, 2004, 605 (01) :105-126
[9]   The stellar content of active galaxies [J].
Fernandes, RC ;
Storchi-Bergmann, T ;
Schmitt, HR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 297 (02) :579-616
[10]  
Fernandes RC, 2001, ASTROPHYS J, V558, P81, DOI 10.1086/322449