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IC 2763



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Arcsecond Positions of UGC Galaxies
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.

An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.

Far-infrared counterpart to the optical and H I plume in the Leo triplet of galaxies - NGC 3623, NGC 3627, and NGC 3628
A study of the IR emission in the Leo triplet of interacting galaxies ispresented. A new background subtraction routine is applied toIRAS-calibrated raw detector data covering a 4 sq deg field centered onthe triplet of galaxies. The discovery of an extragalactic IRcounterpart is reported at 60 and 100 microns to the previously knownoptical and H I tidal plume associated with NGC 3628. The IR plume has aratio I(100 microns)/N(H) of 7 + or - 4 x 10 to the -15th Jy/sr per H Iatoms per sq cm, in striking agreement with Galactic cirrus clouds, anda dust-to-gas ratio of 3.3 x 10 to the -5th. These values are consistentwith the tidal model of the plume formation. The IR plume also exhibitsa gradient of decreasing temperature along the plume away from NGC 3628which can be explained by a dilution of the stellar optical and UVradiation field. In addition to the Leo triplet galaxies, almost allbackground late-type galaxies in the field were detected.

A study of the large-scale structure in the distribution of galaxies in a region centered about the Cancer cluster. III - Further observational results
Further observational results are presented from a study of thelarge-scale structure in the distribution of galaxies in anapproximately 4000 sq deg region nominally centered about the Cancercluster. The criteria used in defining the galaxy sample and theobservational methods used in its study are reviewed. The H I spectraand the associated measured parameters and derived properties for the134 sample galaxies are presented.

An objective prism survey of emission line galaxies
The first list of emission line objects detected as part of an objectprism survey of emission line galaxies begun in China in 1981 ispresented. The instrument and observations are described, and theidentification of emission-line galaxies is discussed. The spectralstructural classification of the presented objects is addressed. On adozen plates covering some 220 square degrees of sky, 50 emission lineobjects were detected, 47 of which are galaxies and the other three ofwhich are planetary nebulae. Finding charts of the objects arepresented.

Eleven New Emission Line Galaxies
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Observation and Astrometry data

Right ascension:11h22m18.50s
Aparent dimensions:1.413′ × 0.339′

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ICIC 2763

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