2004A&A...413...91S


Query : 2004A&A...413...91S

2004A&A...413...91S - Astronomy and Astrophysics, volume 413, 91-96 (2004/1-1)

The nuclear region of low luminosity flat radio spectrum sources. I. Stellar content.

SEROTE ROOS M. and GONCALVES A.C.

Abstract (from CDS):

In this work we have examined the spectroscopic properties of a sample of 19 optically bright, low luminosity Flat Radio Spectrum (LL FRS) sources. Our study focuses on the properties of their host galaxies, namely the nuclear stellar populations and dust content. In the optical - spectral region covered by our data - the objects in the sample are mainly dominated by the host galaxy starlight, which strongly dilutes the non-thermal continuum as well as possible emission-line features related to the active nucleus. We have computed the nuclear stellar populations contributing to the spectra of the objects in our sample. The stellar population synthesis has been performed by using a very reliable mathematical method, which yields a Global Principal Geometrical solution. Our results show that, for most of the objects in the sample, the populations are composed of old stars of solar metallicity, or lower; the populations are mainly composed of late-type stars, i.e. G, K and M spectral types, the young component coming thus from supergiant stars; the dust content is weak. Both the stellar populations and the dust content are in agreement with what is usually observed in ``normal'' elliptical galaxies. Similar stellar content has equally been found in the nuclear regions of galaxies hosting a Low Ionization Nuclear Emission Line Region, or LINER. The present work is important in illustrating the different applications of stellar population synthesis in the study of low luminosity radio sources. In fact, the synthesis allows us not only to obtain valuable information about the stellar populations and dust content of the host galaxies, therefore providing material for further studies on the connection between host galaxy and active nucleus, but also to reveal the so-far unstudied optical emission-line features present in the spectrum of our objects.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: stellar content - galaxies: general

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NVSS J003808+230327 rG 00 38 08.1024 +23 03 28.440           ~ 32 1
2 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 786 2
3 4C 31.04 rG 01 19 35.00087601 +32 10 50.0619670   16 14.5     ~ 235 1
4 8C 0149+710 BLL 01 53 25.85101910 +71 15 06.4633311     15.50     ~ 90 1
5 ICRF J065510.0+410010 QSO 06 55 10.02472583 +41 00 10.1602339   14.6   9.37   ~ 66 1
6 ICRF J073328.6+560541 G 07 33 28.6148 +56 05 41.730           ~ 29 1
7 7C 073311.80+594748.00 Bla 07 37 30.08694371 +59 41 03.1947899   15.5   11.8   ~ 62 1
8 NVSS J085319+682817 rG 08 53 18.89689858 +68 28 19.0131937   14.8       ~ 27 1
9 ICRF J090615.5+463619 Sy2 09 06 15.53979871 +46 36 19.0241852   16.80 16.08     ~ 54 1
10 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1462 0
11 ICRF J114722.1+350107 Sy2 11 47 22.1297825184 +35 01 07.538786184   17.89 16.83 10.26   ~ 174 1
12 NGC 3894 SyG 11 48 50.35817663 +59 24 56.3822416   12.9   11.57   ~ 245 1
13 NVSS J124310+731600 rG 12 43 11.21710248 +73 15 59.2498613           ~ 29 1
14 ICRF J124733.3+672316 Sy2 12 47 33.32959326 +67 23 16.4488689           ~ 87 1
15 7C 1558+5932 QSO 15 59 01.7039 +59 24 21.841   16       ~ 43 1
16 4C 30.31 rG 17 00 45.2320367856 +30 08 12.874902000   15.00 14.3     ~ 72 0
17 2MASX J17052935+2216075 Sy2 17 05 29.3298316080 +22 16 07.585741884           ~ 29 0
18 NGC 6521 Sy1 17 55 48.4316054256 +62 36 44.129200428   14.3   9.3   ~ 66 1
19 ICRF J220421.1+363237 QSO 22 04 21.10050784 +36 32 37.0908847       12.88   ~ 30 1
20 PKS 2320+203 rG 23 23 20.3442252816 +20 35 23.535199932   15.5 15.5     ~ 36 1

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