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VI/112 Optical Imaging of 57 spiral galaxies (Knapen+ 2004)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
table.dat images.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VI/112
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Beginning of ReadMe :VI/112 Optical Imaging of 57 spiral galaxies (Knapen+ 2004)
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Structure and star formation in disc galaxies.
I. Sample selection and near-infrared imaging.
II. Optical Imaging of 57 spiral galaxies.
Knapen J.H., de Jong R.S., Stedman S., Bramich D.M., Folkes S.L.,
Bradley T.R.
<Mon. Not. R. Astron. Soc. 344, 527 (2003)>
<Astron. Astrophys. 426, 1135 (2004) >
=2003MNRAS.344..527K
=2004A&A...426.1135K
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ADC_Keywords: Galaxies, optical ; Galaxies, IR ; Photometry
Keywords: galaxies: spiral - galaxies: structure - infrared: galaxies -
methods: data analysis - techniques: image processing
Abstract:
We present optical observations of a sample of 57 spiral galaxies and
describe the procedures followed to reduce the data. We have obtained
images in the optical B and I broad bands, as well as in Halpha,
with moderate spatial resolution and across wide enough fields to
image the complete disks of the galaxies. In addition, we observed 55
of our sample galaxies in the R and eight in the V band, and imaged a
subset through a dedicated narrow continuum filter for the Halpha
line. We describe the data reduction procedures we developed in the
course of this work to register, combine and photometrically calibrate
each set of images for an individual galaxy. We describe in some
detail the procedure used to subtract the continuum emission from our
Halpha images. In companion papers, we describe near-infrared
imaging of the galaxy sample, and present analyses of disk scale
lengths, and of properties of bars, rings, and HII regions in the
sample galaxies. The images described here will be made available for
use by other researchers through the CDS.
Description:
All B, R, I and Halpha images described in the paper are presented
electronically, along with the K_s_ images from Paper I (Knapen et al.,
2003MNRAS.344..527K). The images are in FITS format, with basic
parameters like pixel scale and calibration described in the FITS
headers. All images have been reduced to the equivalent of 1 second
exposure time. The filenames have the basic format ngc1234X.fits,
where digits 4-7 identify the galaxy's NGC number, which is followed
by a description of the filter used (B, V, R, I, K, Ha [not continuum
subtracted], Ha_cs _[continuum subtracted], or HaCont for the 6470/115
continuum filter). Further details on, e.g., exposure times,
telescopes and filters used, or Ha continuum subtraction can be found
in the papers.