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J/A+A/602/A28     IR signature of CMBH in nearby dwarf galaxies (Marleau+, 2017)

Infrared signature of active massive black holes in nearby dwarf galaxies. Marleau F.R., Clancy D., Habas R., Bianconi M. <Astron. Astrophys. 602, A28 (2017)> =2017A&A...602A..28M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, IR ; Redshifts Keywords: galaxies: general - galaxies: Seyfert - galaxies: active - galaxies: dwarfs - Local Group - infrared: galaxies Abstract: We investigate the possible presence of active galactic nuclei (AGN) in dwarf galaxies and other nearby galaxies to identify candidates for follow-up confirmation and dynamical mass measurements. We identify candidate active central massive black holes (CMBH) using their mid-infrared emission, verify their nature using existing catalogues and optical line emission diagnostics, and study the relationship between their mass and the mass of their host galaxy. We use the Wide-field Infrared Survey Explorer (WISE) All-Sky Release Source Catalog and examine the infrared colours of a sample of dwarf galaxies and other nearby galaxies in order to identify both unobscured and obscured candidate AGN by applying the infrared colour diagnostic. Stellar masses of galaxies are obtained using a combination of three independent methods. Black hole masses are estimated using the bolometric luminosity of the AGN candidates and computed for three cases of the bolometric-to-Eddington luminosity ratio. We identify 303 candidate AGN, of which 276 were subsequently found to have been independently identified as AGN via other methods. The remaining 9% require follow-up observations for confirmation. The activity is detected in galaxies with stellar masses from ∼106 to 109M; assuming the candidates are AGN, the black hole masses are estimated to be ∼103-106M, adopting Lbol=0.1LEdd. The black hole masses probed are several orders of magnitude smaller than previously reported for centrally located massive black holes. We examine the stellar mass versus black hole mass relationship in this low galaxy mass regime. We find that it is consistent with the existing relation extending linearly (in log-log space) into the lower mass regime. These findings suggest that CMBH are present in low-mass galaxies and in the Local Universe, and provide new impetus for follow-up dynamical studies of quiescent black holes in local dwarf galaxies. Description: List of dwarf (table2.dat) and non-dwarf (table3.dat) galaxies with IR signatures of active massive black holes. The entries in each table include: name, right ascension and declination (J2000), redshift, distance in Mpc, log of stellar mass measured from SED fit, WISE colours, log of central black hole mass estimates based on IR luminosity (assuming Lbol=0.1LEdd), and image number in Figure 2. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 102 62 List of dwarf galaxies with IR signatures of active massive black holes table3.dat 102 241 List of non-dwarf galaxies with IR signatures of active massive black holes
See also: J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007) J/ApJ/755/167 : Low-mass black holes in SDSS Seyfert 1 galaxies (Dong+, 2012) J/ApJ/775/116 : z<0.06 active black hole galaxies from SDSS-DR8 (Reines+, 2013) Byte-by-byte Description of file: table2.dat table3.dat
Bytes Format Units Label Explanations
1- 28 A28 --- Name Name 29- 30 I2 h RAh Source right ascension (J2000) 32- 33 I2 min RAm Source right ascension (J2000) 35- 39 F5.2 s RAs Source right ascension (J2000) 41 A1 --- DE- Source declination sign (J2000) 42- 43 I2 deg DEd Source declination (J2000) 45- 46 I2 arcmin DEm Source declination (J2000) 48- 51 F4.1 arcsec DEs Source declination (J2000) 53- 61 F9.6 --- z ?=-9.999 Redshift 63- 70 F8.3 Mpc Dist ?=-9.999 Distance 72- 78 F7.3 [Msun] logM* ?=-99.999 Log stellar mass 80- 84 F5.3 mag W1-W2 WISE w1mpro-w2mpro color index 86- 90 F5.3 mag W2-W3 WISE w2mpro-w3mpro color index 92- 97 F6.3 [Msun] logMBH Log black hole mass 99-100 I2 --- Image ? Image number in Figure 2 101-102 A2 --- n_Image Note on Image (1)
Note (1): Notes as follows: * = These sources are outliers with very red WISE colors and have optical diagnostics consistent with HII regions (Griffith et al., 2011ApJ...736L..22G). ** = These sources are extended and larger than the largest WISE aperture (24.75 arcsec radius aperture) therefore the IR BH mass estimates for these sources is only a lower limit.
Acknowledgements: Francine Marleau, francine.marleau(at)
(End) Francine Marleau [Univ. of Innsbruck], Patricia Vannier [CDS] 12-Apr-2017
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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