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Date and Time of the Query: 2019-04-25 T09:12:29 PDT
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For refcode 2002AJ....123..159C:
Retrieve 78 NED objects in this reference.
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2002AJ....123..159C SPIRAL GALAXIES WITH HST/NICMOS. I. NUCLEAR MORPHOLOGIES, COLOR MAPS, AND DISTINCT NUCLEI C. MARCELLA CAROLLO Department of Astronomy, Columbia University, 538 West 120th Street, New York, NY 10027 MASSIMO STIAVELLI Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 MARC SEIGAR Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium; and Space Telescope Science Institute,3700 San Martin Drive, Baltimore MD 21218 P. TIM DE ZEEUW Sterrewacht Leiden, Postbus 9513, NL-2300 RA Leiden, Netherlands AND HERWIG DEJONGHE Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium Received 2000 May 11; accepted 2001 October 4 ABSTRACT This is the first of two papers where we present the analysis of an HST/NICMOS2 near-infrared (NIR) snapshot survey in the F160W (H) filter for a sample of 78 spiral galaxies selected from the UGC and ESOLV catalogs. For 69 of these objects we provide nuclear color information derived by combining the H data either with additional NICMOS F110W (J) images or with V WFPC2/HST data. Here we present the NIR images and the optical-NIR color maps. We focus our attention on the properties of the photometrically distinct "nuclei" which are found embedded in most of the galaxies and provide measurements of their half-light radii and magnitudes in the H (and when available in the J) band. We find that (1) in the NIR the nuclei embedded in the bright early- to intermediate-type galaxies span a much larger range in brightness than the nuclei which are typically found embedded in bulgeless late-type disks: the nuclei embedded in the early- to intermediate-type galaxies reach, on the bright end, values up to H_AB_ ~ -17.7 mag; (2) nuclei are found in both nonbarred and barred hosts, in large-scale (>~1 kpc) as well as in nuclear (up to a few 100 pc) bars; (3) there is a significant increase in half-light radius with increasing luminosity of the nucleus in the early/intermediate types (a decade in radius for ~8 mag brightening), a correlation which was found in the V band and which is also seen in the NIR data; (4) the nuclei of early/intermediate-type spirals cover a large range of optical-NIR colors, from V-H ~ -0.5 to 3. Some nuclei are bluer and others redder than the surrounding galaxy, indicating the presence of activity or reddening by dust in many of these systems; (5) some early/intermediate nuclei are elongated and/or slightly offset from the isophotal center of the host galaxy. On average, however, these nuclei appear as centered, star-cluster-like structures similar to those which are found in the late-type disks. Key words: galaxies: bulges - galaxies: evolution - galaxies: formation - galaxies: nuclei - galaxies: spiral - galaxies: structure
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