J/AJ/126/1750 Seyfert population in SSRS2 (Maia+, 2003)
The Seyfert population in the local universe.
Maia M.A.G., Machado R.S., Willmer C.N.A.
<Astron. J. 126, 1750 (2003)>
=2003AJ....126.1750M 2003AJ....126.1750M
ADC_Keywords: Galaxies, Seyfert ; Active gal. nuclei ; Radial velocities ;
Morphology
Keywords: galaxies: Seyfert
Abstract:
The magnitude-limited catalog of the Southern Sky Redshift Survey
(SSRS2, Cat. J/AJ/116/1) is used to characterize the properties of
galaxies hosting active galactic nuclei (AGNs). Using emission-line
ratios, we identify a total of 162 (3%) Seyfert galaxies out of the
parent sample with 5399 galaxies. The sample contains 121 Seyfert 2
galaxies and 41 Seyfert 1 galaxies. The SSRS2 Seyfert galaxies are
predominantly in spirals of types Sb and earlier or in galaxies with
perturbed appearance as the result of strong interactions or mergers.
Seyfert galaxies in this sample are twice as common in barred hosts as
the non-Seyfert galaxies. By assigning galaxies to groups using a
percolation algorithm, we find that the Seyfert galaxies in the SSRS2
are more likely to be found in binary systems when compared with
galaxies in the SSRS2 parent sample. However, there is no
statistically significant difference between the Seyfert and SSRS2
parent sample when systems with more than two galaxies are considered.
The analysis of the present sample suggests that there is a stronger
correlation between the presence of the AGN phenomenon with internal
properties of galaxies (morphology, presence of bar, luminosity) than
with environmental effects (local galaxy density, group velocity
dispersion, nearest neighbor distance).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 162 SSRS2 Seyfert Galaxies
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See also:
J/AJ/116/1 : Southern Sky Redshift Survey, SSRS2 (Da Costa+, 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of right ascension (J2000)
4- 5 I2 min RAm Minute of right ascension (J2000)
7- 10 F4.1 s RAs Second of right ascension (J2000)
12 A1 --- DE- Sign of the declination (J2000)
13- 14 I2 deg DEd Degree of declination (J2000)
16- 17 I2 arcmin DEm Arcminute of declination (J2000)
19- 20 I2 arcsec DEs Arcsecond of declination (J2000)
22- 41 A20 --- ID Object identification
43- 47 F5.2 mag SSRSmag Southern Sky Redshift Survey apparent
magnitude (1)
49- 53 I5 km/s HRV Heliocentric radial velocity
55- 56 I2 --- MType Morphological type
58 A1 --- Bar Presence of a bar
60- 63 F4.2 --- b/a Axial ratio
65- 66 A2 --- Sey Seyfert type
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Note (1): Derived from the HST Guide Star Catalog (Lasker et al., 1990.
Cat. I/220) and refers to the galaxy as a whole, there being no
decomposition between the contribution from the host galaxy and the
AGN.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 21-Nov-2003