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Supernova 2003U in NGC 6365A
IAUC 8061 available at Central Bureau for Astronomical Telegrams.
| Supernova 2003U in NGC 6365A
IAUC 8059 available at Central Bureau for Astronomical Telegrams.
| Seeing Galaxies through Thick and Thin. II. Direct Measures of Extinction in Spiral Disks through Spectroscopy of Overlapping Galaxies
We use slit spectroscopy of overlapping pairs of galaxies to directlydetermine the extinction in disks of foreground spiral galaxies. TheDoppler shifts of pair members are determined via cross-correlation, andtheir relative correlation amplitudes are used to separate theircontributions to the combined spectra in regions of overlap. Thisspectroscopic approach is less subject to stringent symmetry constraintsthan our previous, purely photometric analyses. Extinctions offoreground members were obtained for six of the candidates in our sampleof 18 mostly spiral/spiral pairs, when the signal-to-noise-ratio andvelocity differences were suitable. In agreement with our previousimaging results, we find that the extinction in interarm regions is verymodest, typically AB~0.1 mag (corrected to face-on), whilespiral arms exhibit higher extinctions of ~0.3 mag.
| 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.
| A photometric study of interacting galaxies. I - Observations
As part of an investigation on what effect galaxy-galaxy interaction hason the global photometric properties of the involved galaxies, wepresent here new photometric data in the Cousins R-prime system for asample of 35 interacting systems. Isophotes, equivalent profiles, andtotal magnitudes of all sample galaxies (73) are determined. Ourestimates and the comparison with the published results show that theaccuracy of our photometry is about 0.2-0.3 mag. A later paper willpresent the interpretation of the data.
| A photometric study of interacting galaxies. 2: Analysis of the results
We present the results of a detailed photometric study in theRC band of 73 galaxies in close interacting systems. Thesample for this study was selected mainly from the Atlas of PeculiarGalaxies by Arp on the basis of the optical morphology of galaxies. Theobserved systems exhibit: an excess of early type spirals (Sa) anddeficiency of late type ones (Sm/Irr), and excess of brighter galaxiesas compared with field galaxies. From the decomposition of theequivalent profiles we found the following principal results: (a)Interacting ellipticals and bulges of SO galaxies are systematicallydisplaced in the plane mue - Re from the relationfor normal galaxies. This displacement may be explained in terms ofbulges of interacting galaxies being more compact. (b) Bulges ofinteracting spirals are located in the effective parameters plane in thesame region of bulges of non-interacting galaxies. (c) Disks of stronglyinteracting spirals are 2-3 times thicker as compared with disks ofnormal galaxies. (d) The central surface brightnesses (mu0 ofthe disks of interacting galaxies are, on average, brighter than forfield spirals. (e) There is no clear dependence of the globalphotometric characteristics of galaxies on the interaction strength.There is a weak tendency for galactic disks to be slightly brighter andshorter than in strongly interacting systems.
| Northern dwarf and low surface brightness galaxies. II - The Green Bank neutral hydrogen survey
The paper reports neutral hydrogen observations of a large sample ofdwarf and other low surface brightness galaxies. A detailed discussionand error analysis of the observations are presented, and spectra aredisplayed for 329 galaxies detected for the first time, or detected withsubstantially better signal-to-noise ratios than achieved previously.The positions on the sky of 667 galaxies meeting the present selectioncriteria north of delta = 38 deg are shown. The distribution of theredshifts of galaxies detected at Green Bank is illustrated. The GreenBank detections tapered off strongly below the median H I flux of 3.7 Jykm/s detected at Arecibo: only 12 percent of the Green Bank sample wasdetected with smaller fluxes.
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