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. =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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 61 91 Nuclear Morphology and Host Galaxy Parameters for Seyfert 1 Galaxies -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) 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) -------------------------------------------------------------------------------- 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 B_T_^0^ (corrected for interstellar extinction and the K-correction). We used B_T_^0^-BMAG=5log(cz/H_0_)+25, with H_0_=71km/s/Mpc (Spergel et al., 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 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Sep-2007