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A new H I catalog of Low Surface Brightness galaxies out to z = 0.1. Tripling the number of massive LSB galaxies known
Using both the Arecibo 305 m and the Nançay decimetric 100-mclass radio telescopes, we have observed the H I line of 116 Low SurfaceBrightness (LSB) galaxies from the Bothun et al. (1985) subset of LSBgalaxies in the Uppsala General Catalog. The observations had adetection rate of 70%, resulting in the new determination of H Iproperties for 81 galaxies. Surprisingly, roughly half of the detectedobjects (38) have MHI ≥1010Mȯ, placing them into the category of massive LSBgalaxies. As previously only 18 of these ``Malin 1 cousins'' wereknown, our results have more than tripled the number of thesefascinating and enigmatic systems known. Combining our results withprevious studies done on the Bothun et al. catalog results in awell-defined catalog of H I properties of 526 LSB galaxies ranging inredshift space from 0 ≤z ≤0.1. With this catalog in hand, wehave been able to explore the parameter space occupied by LSB galaxiesmore completely than has been previously possible. In agreement withprevious studies, our results show LSB galaxies with some of the mostextreme properties of disk galaxies, includingMHI/LB ratios often exceeding 10Mȯ/Lȯ,B.Tables 1-3 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/428/823Appendix is only available in electronic form athttp://www.edpsciences.org
| The UZC-SSRS2 Group Catalog
We apply a friends-of-friends algorithm to the combined Updated ZwickyCatalog and Southern Sky Redshift Survey to construct a catalog of 1168groups of galaxies; 411 of these groups have five or more members withinthe redshift survey. The group catalog covers 4.69 sr, and all groupsexceed the number density contrast threshold, δρ/ρ=80. Wedemonstrate that the groups catalog is homogeneous across the twounderlying redshift surveys; the catalog of groups and their membersthus provides a basis for other statistical studies of the large-scaledistribution of groups and their physical properties. The medianphysical properties of the groups are similar to those for groupsderived from independent surveys, including the ESO Key Programme andthe Las Campanas Redshift Survey. We include tables of groups and theirmembers.
| 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.
| Galaxy coordinates. II. Accurate equatorial coordinates for 17298 galaxies
Using images of the Digitized Sky Survey we measured coodinates for17298 galaxies having poorly defined coordinates. As a control, wemeasured with the same method 1522 galaxies having accurate coordinates.The comparison with our own measurements shows that the accuracy of themethod is about 6 arcsec on each axis (RA and DEC).
| A catalogue of Mg_2 indices of galaxies and globular clusters
We present a catalogue of published absorption-line Mg_2 indices ofgalaxies and globular clusters. The catalogue is maintained up-to-datein the HYPERCAT database. The measurements are listed together with thereferences to the articles where the data were published. A codeddescription of the observations is provided. The catalogue gathers 3541measurements for 1491 objects (galaxies or globular clusters) from 55datasets. Compiled raw data for 1060 galaxies are zero-point correctedand transformed to a homogeneous system. Tables 1, 3, and 4 areavailable in electronic form only at the CDS, Strasbourg, via anonymousftp 130.79.128.5. Table 2 is available both in text and electronic form.
| Extragalactic Globular Clusters. IV. The Data
We have explored the use of absorption line strength indices, measuredfrom integrated globular cluster spectra, to predict mean metallicity inlate-type stellar systems. In previous papers we identified the bestindices for such metallicity calibrations out of ~13 measured in a largesample of galactic and M31 cluster spectra. In this paper we present theindividual measurements of 13 indices and averages of multiplemeasurements, where appropriate. Data are given for 151 M31 globularclusters, 88 galaxies, 22 M33 cluster candidates, 10 M87 clusters, eightM81 globular clusters, three Fornax dwarf galaxy clusters, "standard"stars from the lists of Faber et al., stars in the open cluster NGC 188and, for completeness, other stars observed as candidate globularclusters.
| Extragalactic globular clusters. III - Metallicity comparisons and anomalies
A method based on the strengths of six absorption line indices measuredin integrated spectra is used to derive metallicities for 22 globularclusters associated with the Sc galaxy, M33, 10 globular clusters withthe giant elliptical galaxy, M87, eight globular clusters associatedwith the Sb(r)I-II galaxy, M81, and three globular clusters associatedwith the Fornax dwarf elliptical galaxy. Mean metallicities are derivedfor 38 bright galaxies, mostly ellipticals, 29 dwarf elliptical galaxiesin the Virgo cluster, 10 dwarf elliptical galaxies in the Fornaxcluster, and four local group dwarf galaxies. These results are comparedwith previously derived metallicities for 149 clusters in M31 and withthe Milky Way cluster metallicities to show that the mean metallicity ofa cluster system is linearly related to the luminosity of the parentgalaxy. A similar relationship is suggested between galaxy metallicityand luminosity for the bright and dwarf galaxies.
| 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 redshift survey of low-surface-brightness galaxies. I - The basic data
Initial results from a 21 cm redshift survey of 375 very low surfacebrightness galaxies contained in the Uppsala General Catalog of Galaxiesare presented. The selection criteria and detection statistics as afunction of the sample optical properties are fully discussed. Theredshift distribution for the sample exhibits a pronounced peak at 5000km/s, corresponding to the well-studied Perseus-Pisces supercluster. Theoverall detection rate was 65 percent, and the bulk of the detectionsare genuine low surface brightness spiral galaxies, may with linewidthsin excess of 300 km/s, as opposed to true dwarf galaxies. It is arguedthat most of the nondetections are unlikely to be gas-poor dwarfs, butinstead are galaxies with velocities beyond 10,000 km/s. Taken as awhole, the sample demonstrates that optical surface brightness is notnecessarily a reliable indicator of intrinsic luminosity or mass.
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