J/AJ/132/321 Morphology of narrow-line Seyfert 1 galaxies (Deo+, 2006)
The host galaxies of narrow-line Seyfert 1 galaxies:
nuclear dust morphology and starburst rings.
Deo R.P., Crenshaw D.M., Kraemer S.B.
<Astron. J., 132, 321-346 (2006)>
=2006AJ....132..321D 2006AJ....132..321D
ADC_Keywords: Galaxies, Seyfert ; Redshifts ; Morphology
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert -
galaxies: structure
Abstract:
We present a study of the nuclear morphology of a sample of narrow-
and broad-line Seyfert 1 galaxies (NLS1s and BLS1s, respectively)
based on broadband images in the Hubble Space Telescope archives. In
our previous study we found that large-scale stellar bars at >1kpc
from the nucleus are more common in NLS1s than BLS1s. In this paper we
find that NLS1s preferentially have grand-design dust spirals within
∼1kpc of their centers. We also find that NLS1s have a higher fraction
of nuclear star-forming rings than BLS1s. We find that many of the
morphological differences are due to the presence or absence of a
large-scale stellar bar within the spiral host galaxy. In general,
barred Seyfert 1 galaxies tend to have grand-design dust spirals at
their centers, confirming the results of other researchers. The high
fraction of grand-design nuclear dust spirals and stellar nuclear
rings observed in NLS1s' host galaxies suggests a means for efficient
fueling of their nuclei to support their high Eddington ratios.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 91 Nuclear Morphology and Host Galaxy Parameters
for Seyfert 1 Galaxies
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See also:
J/ApJS/141/23 : JHK' imaging photometry of Seyfert 1. I. (Enya+, 2002)
J/ApJS/141/31 : JHK' imaging photometry of Seyfert 1. II. (Enya+, 2002)
J/AJ/124/3042 : Narrow-line Seyfert 1 galaxies from SDSS EDR (Williams+, 2002)
J/AJ/131/1948 : Narrow line Seyfert 1 galaxies in the FBQS (Whalen+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Source name (1)
17 A1 --- n_Name [a-g] Note on Name (2)
19- 23 F5.3 --- z Redshift (Crenshaw, Kraemer & Gabel,
2003AJ....126.1690C 2003AJ....126.1690C)
25- 28 F4.2 --- b/a The RC3 axial ratio from NED
30- 33 F4.1 --- T Numerical Hubble stage index from NED (3)
35- 40 F6.2 mag BMAG ? Absolute B band magnitude from NED (4)
42- 45 A4 --- SClass Seyfert 1 class
47- 48 A2 --- Morph Large-scale morphology (5)
50- 61 A12 --- N-Morph Nuclear morphology (6)
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Note (1): All images except as noted were taken with F606W filter.
Note (2): Flags as follows:
a = Observed with the F814W filter
b = Galaxy positioned in WF2 chip
c = Galaxy positioned in WF4 chip
d = Not included in Figure2
e = Excluded from analysis, see Section 2.1
f = Other name: NGC4748
g = The MAST fits header entry for this galaxy mentions it
as II ZW 10 which is incorrect
Note (3): Some values for the Hubble stage T were reassigned using
classifications from The de Vaucouleurs Atlas of Galaxies,
Buta, Corwin and Odewahn (in preparation).
Note (4): Computed from the corrected asymptotic blue magnitude BT0
(corrected for interstellar extinction and the K-correction). We used
BT0-BMAG=5log(cz/H0)+25, with H0=71km/s/Mpc
(Spergel et al., 2003ApJS..148..175S 2003ApJS..148..175S).
Note (5): Large-scale morphology description are:
S = spiral
SB = barred spiral
E = elliptical
I = irregular
P = point source
? = not classified
Note (6): Primary nuclear morphology classes are:
ND = no significant dust
DS = dust spiral
DB = dust bar
A = amorphous structures
DL = large-scale dust lane
NR = Nuclear Ring
SBS = Star-burst (nuclear) Spiral
Secondary nuclear morphology classes are:
GD = grand-design spiral
FL = flocculent multi-arm spiral
? = for no secondary classification
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Sep-2007