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NGC 5681



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We present accurate B1950 and J2000 positions for all confirmed galaxiesin the Uppsala General Catalog (UGC). The positions were measuredvisually from Digitized Sky Survey images with rms uncertaintiesσ<=[(1.2")2+(θ/100)2]1/2,where θ is the major-axis diameter. We compared each galaxymeasured with the original UGC description to ensure high reliability.The full position list is available in the electronic version only.

H II Regions in Southern Spiral Galaxies: The H alpha Luminosity Function
By using narrow-band filters to measure the H alpha flux, a catalog of HII regions in several spiral galaxies was made, consisting of theposition and flux of the objects. For each galaxy the H alpha luminosityfunction was derived. From the observed sample, two galaxies were foundto have type II luminosity functions. Some simple models were made inorder to understand the nature of the luminosity function (both type Iand type II). The goal of our work was to simulate how a change ofstar-forming region, the cluster-mass distribution, or the initial massfunction (in an evolutionary environment) can change the shape of theluminosity function.

H I observations of galaxies in the Hercules supercluster. II - Additional UGC galaxies and galaxies in selected CGCG fields
The second installment of a H I redshift survey in the region of theHercules supercluster is presented. This part of the survey presents 218H I spectra of galaxies selected from the UGC which extends thepreviously begun survey of UGC galaxies in that region. In addition,spectra of 136 galaxies from selected CGCG fields are given. The CGCGfields were chosen to cover the projected position of the Hercules void.Measured H I parameters from the spectra are given. This survey wasconducted for application of the Tully-Fisher relation to search forstreaming motion around the void in front of the supercluster. Theselection effects affecting such a search are discussed in detail.

The far-infrared properties of the CfA galaxy sample. I - The catalog
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A survey of galaxy redshifts. IV - The data
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Observation and Astrometry data

Right ascension:14h35m42.90s
Aparent dimensions:0.871′ × 0.631′

Catalogs and designations:
Proper Names   (Edit)
NGC 2000.0NGC 5681

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