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J/ApJ/616/707     Circumnuclear structure of NICMOS galaxies       (Hunt+, 2004)

Circumnuclear structure and black hole fueling: Hubble Space Telescope NICMOS imaging of 250 active and normal galaxies. Hunt L.K., Malkan M.A. <Astrophys. J., 616, 707-729 (2004)> =2004ApJ...616..707H
ADC_Keywords: Morphology ; Active gal. nuclei ; Galaxies, IR Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert - galaxies: starburst - galaxies: structure - infrared: galaxies Abstract: Why are the nuclei of some galaxies more active than others? If most galaxies harbor a central massive black hole, the main difference is probably in how well it is fueled by its surroundings. We investigate the hypothesis that such a difference can be seen in the detailed circumnuclear morphologies of galaxies using several quantitatively defined features, including bars, isophotal twists, boxy and disky isophotes, and strong nonaxisymmetric features in unsharp-masked images. These diagnostics are applied to 250 high-resolution images of galaxy centers obtained in the near-infrared with NICMOS on the Hubble Space Telescope. To guard against the influence of possible biases and selection effects, we have carefully matched samples of Seyfert 1, Seyfert 2, LINER, starburst, and normal galaxies in their basic properties, taking particular care to ensure that each was observed with a similar average scale (10-15pc/pixel). Description: We have acquired HST NICMOS F160W images of 30 Seyfert galaxies in a GO Snapshot Program (ID 5479; PI: M. A. Malkan). Our GO snapshots have been augmented with other F160W snapshot images from the HST archive acquired with all three NICMOS cameras (Pogge-ID 7867; Mulchaey-ID 7330; Sparks-ID 7919; Stiavelli-ID 7331; Peletier-ID 7450). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 101 165 Sample properties table4.dat 101 78 Properties of 78 of the 85 rejected galaxies
Byte-by-byte Description of file: table2.dat table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- AType Activity class 12- 23 A12 --- Name Object name 24- 25 A2 --- f_Name [d*] Eliminated galaxy (1) 28- 33 F6.3 --- z Redshift 35- 39 F5.1 Mpc Dist Distance 41- 59 A19 --- MType The RC3 (Cat. VII/155) morphology type 61- 64 F4.1 arcmin MajAxis Optical major axis 66- 69 F4.1 arcmin MinAxis Optical minor axis 71- 74 F4.1 mag Bmag The apparent B band magnitude 76- 80 F5.1 mag BMAG The absolute B band magnitude 82- 85 F4.1 pc/pix Scale Relative spatial resolution 87- 88 A2 --- Bar [Y? ] Bar found? 90- 91 A2 --- Twist [Y? ] Isophotal twist found? 93- 94 A2 --- 3theta [Y? ] Large 3θ residual term found? 96- 99 A4 --- cos4 [DB? ] Boxy/disky isophote found (2) 101 A1 --- USM [±] High-amplitude non-axisymmetric structure (3)
Note (1): Flag on Name, defined as follows: * = Eliminated in the DMS because distance>80Mpc. d = Eliminated in the IMS because inclination>70 degrees. Note (2): The isophote found is defined as follows: B = Boxy; D = Disky. Note (3): Unsharp masks which have any 180-parsec boxes which deviate from the smooth model fit by more than ±27%; those with positive deviations are designated with "+", and negative ones with "-".
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 01-Jun-2005
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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