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|Molecular gas in the galaxy cluster Abell 262. CO observations of UGC 1347 and other galaxies of the cluster|
We present millimeter CO line emission observations of 12 galaxieswithin the Abell 262 cluster, together with L_FIRdata, in the context of a possible molecular gas deficiency within theregion of the cluster center. Several indications of the presence ofsuch a deficiency are highlighted and connected to a model ofcirrus-like cloud stripping. The model predicts a drop in the average100 μm flux density of galaxies in the core of the cluster comparedto the average 100 μm flux density in the outer regions, which isactually indicated in the IRAS data of the cluster members. This drop isexplained by the decrease in the total hydrogen column density N(H) and,therefore, also includes a decrease in the molecular gas content. Inaddition to results for the global CO content of the galaxy sample,high-resolution interferometric CO(1-0) observations of one of thecluster members, UGC 1347, exemplify the spatial distribution of themolecular gas in a galaxy of the cluster. With these observations, itwas possible to confirm the existence of a bright off-nuclearCO-emission source and to derive molecular masses and line ratios forthis source and the nucleus.
|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.
|KISO survey for ultraviolet-excess galaxies. XIII.|
|Gas deficiency in cluster galaxies - A comparison of nine clusters|
The available 21 cm line data in the literature for galaxies in nineclusters is combined with new high-sensitivity observations of 51galaxies in five of the nine clusters in order to test fordiscriminating circumstances between those clusters which show H Ideficiency among their spiral population and those which do not. An H Ideficiency for the complete cluster sample is derived employing acomparison sample of galaxies chosen from the Catalog of IsolatedGalaxies. The deficiency and its radial dependence is summarized foreach cluster and a composite. A comparison of the environments indifferent clusters leads to the conclusion that the occurrence of H Ideficiency is correlated with the presence of a hot X-ray intraclustermedium, and that an ongoing interaction process is active through thecores of X-ray clusters.
|The Perseus supercluster|
Results are presented of a redshift survey of galaxies with photographicmagnitudes less than or equal to 14.0 located between 0 h 15 min and 3 h20 min RA and 26 and 45 deg dec, the region identified with the Perseussupercluster. New redshifts are reported for 116 galaxies, and arecombined with literature data to obtain values for a total of 141galaxies in the region. Morphological classifications, diameters,position angles and ellipticities are also presented for all 141galaxies. The 116 galaxies in the sample with radial velocities between3700 and 9000 km/sec are found to form a supercluster with a filamentarystructure including the Perseus, A347, A262, NGC 383 and NGC 507clusters and with a mean velocity of 5327 km/sec. It is estimated thatsuperclusters occupy approximately 1% of the universe, with a mean freepath between superclusters of 285/h Mpc. Results support the view thatcluster- and supercluster-mass clouds fragment before galaxies andcommunicate anisotropic matter and velocity distributions to galaxies.The results are also noted to be consistent with intrinsic galacticredshifts and band structure.
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