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J/ApJ/678/116            AGNs in nuclear star clusters             (Seth+, 2008)

The coincidence of nuclear star clusters and active galactic nuclei. Seth A., Agueros M., Lee D., Basu-Zych A. <Astrophys. J., 678, 116-130 (2008)> =2008ApJ...678..116S
ADC_Keywords: Active gal. nuclei ; Morphology ; Magnitudes, absolute Keywords: galaxies: active - galaxies: formation - galaxies: nuclei - galaxies: star clusters Abstract: We study galaxies that host both nuclear star clusters and AGNs, implying the presence of a massive black hole. We select a sample of 176 galaxies with previously detected nuclear star clusters that range from ellipticals to late-type spirals. We search for AGNs in this sample using optical spectroscopy and archival radio and X-ray data. We find galaxies of all Hubble types and with a wide range of masses (109-1011M) hosting both AGNs and nuclear star clusters. From the optical spectra, we classify 10% of the galaxies as AGN and an additional 15% as composite, indicating a mix of AGN and star formation spectra. The fraction of nucleated galaxies with AGNs increases strongly as a function of galaxy and nuclear star cluster mass. For galaxies with both a nuclear star cluster and a black hole, we find that the masses of these two objects are quite similar. However, nondetections of black holes in Local Group nuclear star clusters show that not all clusters host black holes of similar masses. We discuss the implications of our results for the formation of nuclear star clusters and massive black holes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 59 176 Galaxies with nuclear star clusters sample
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/AJ/127/105 : Nuclear star clusters in late-type spiral galaxies (Boker+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Galaxy name 16- 19 A4 --- TType Morphological type 21- 24 F4.1 --- T Numerical Morphological type 26- 29 F4.1 Mpc Dist Distance 31- 35 F5.1 mag BMAG Absolute B band magnitude 37- 40 F4.1 [solMass] logMG ? Log of galaxy mass 42- 44 A3 --- r_logMG Reference (1) 46- 49 F4.2 arcsec Reff ? Nuclear star cluster effective radius (2) 51- 53 F3.1 [solMass] logMNC Log of nuclear star cluster mass 55- 59 A5 --- Sref Spectra reference (3)
Note (1): Reference as follows: B02 = Boker et al. (2002AJ....123.1389B); C06 = Cote et al. (2006ApJS..165...57C); C02 = Carollo et al. (2002AJ....123..159C); C99 = Carollo et al. (1998AJ....116...68C); C97 = Carollo et al. (1997AJ....114.2366C); S06 = Seth et al. (2006AJ....132.2539S). Note (2): Blank values indicate unresolved by HST observations and thus have effective radii ≲0.03". Note (3): Spectra reference as follows: SDSS = Sloan Digital Sky Survey, Cat. II/294. HFS97 = Ho et al. (1997ApJ...487..568H). S&H = spectra present in both SDSS and HFS97.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Sep-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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