|Kinematics of the local universe . XII. 21-cm line measurements of 586 galaxies with the new Nançay receiver|
This paper presents 586 new 21-cm neutral hydrogen line measurementscarried out with the FORT receiver of the meridian transit Nançayradiotelescope in the period July 2000-March 2003. This observationalprogramme is part of a larger project aiming at collecting an exhaustiveand magnitude-complete HI extragalactic catalogue for Tully-Fisherapplications. It is associated with the building of the MIGALEspectroscopic archive and database.Tables 2, 3 and HI-profiles and corresponding comments are onlyavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (126.96.36.199) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/430/373, or directly atour web site http://klun.obs-nancay.fr
|Supernova 2004da in NGC 6901|
IAUC 8371 available at Central Bureau for Astronomical Telegrams.
|Supernova 2004da in NGC 6901|
IAUC 8370 available at Central Bureau for Astronomical Telegrams.
|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.
|Surface Brightness Fluctuation Distances to Dwarf Elliptical Galaxies in the Sculptor Group|
As part of an ongoing search for dwarf elliptical galaxies (dE's) in thevicinity of the Local Group (Jerjen et al.), we acquired deep B- andR-band images for five dE candidates identified on morphologicalcriteria in the Sculptor (Scl) group region. We carried out a surfacebrightness fluctuation (SBF) analysis on the R-band images to measurethe apparent fluctuation magnitude m_R for each dE. Using predictionsfrom stellar population synthesis models (Worthey) giving M_R values inthe narrow range between -1.17 and -1.13, the galaxy distances weredetermined. All of these dE candidates turned out to be satellites ofScl group major members. A redshift measurement of the dE candidate ESO294-010 yielded an independent confirmation of its group membership: the[O III] and Hα emission lines from a small H II region gave aheliocentric velocity of 117 (+/-5) km s^-1, in close agreement with thevelocity of its parent galaxy NGC 55 (v_ȯ = 125 km s^-1). Theprecision of the SBF distances (5%-10%) contributes to delineating thecigar-like distribution of the Scl group members, which extend overdistances from 1.7 to 4.4 Mpc and are concentrated in three, possiblyfour subclumps. The Hubble diagram for nine Scl galaxies, including twoof our dE's, exhibits a tight linear velocity-distance relation with asteep slope of 119 km s^-1 Mpc^-1. The results indicate thatgravitational interaction among the Scl group members plays only a minorrole in the dynamics of the group. However, the Hubble flow of theentire system appears strongly disturbed by the large masses of ourGalaxy and M31, which leads to the observed shearing motion. From thedistances and velocities of 49 galaxies located in the Local Group andtoward the Scl group, we illustrate the continuity of the galaxydistribution, which strongly supports the view that the two groups forma single supergalactic structure.
|A list of some corrections to Zwicky's Catalogue of Galaxies and Clusters of Galaxies|
|Exploding stars and the expanding universe (The 1990 Grubb Parsons Lecture)|
Supernovae are exploding stars: after as little as ten million years ofpreparation, a single star can shine as brightly as 10 billion suns fora few weeks. Supernovae come in two broad classes - one that provides a'custom yardstick' to measure the distances to individual galaxies andanother that offers standard candles that can be detected a third of theway across the universe. Techniques are being developed to use thesestellar beacons to gage the age of the Universe and the geometry ofspace. Definitive answers are not in yet, but they are within our graspand supernovae may soon become a central element of the cosmologicalquest.
|The neutral hydrogen ring, mass-to-light ratio, and dark halo of the elliptical galaxy IC 2006|
Observations of the E1 galaxy IC 2006 are presented, and the imaging,photometric, and spectroscopic data are analyzed. The galaxy is found tobe in every respect normal for an elliptical galaxy of its luminosity.It is surrounded by an unusually regular ring of 18.9 kps radius,containing (4.8 + or - 0.8) x 10 to the 8th solar masses of H I thatrotates in the opposite sense of the stars near the center. Theintegrated M/L(B) within the radius of the ring indicates the presenceof a halo of dark matter with about twice the mass of the luminousmatter. Very weak emission lines reveal a central mass of ionized gasextending to about 5 kpc radius. This gas also rotates counter to thestars and is highly turbulent. The dwarf companion Karachentseva 22 liesat a projected distance of 3.1 ring radii and has one-third as much H Ias the ring, but is unlikely to be the donor of the ring H I.
|Cluster population incompleteness bias and the value of H(0) from the Tully-Fisher B0(T) relation|
Data on the Virgo cluster and ten more distant clusters are the basis ofan evaluation of the influence of the cluster population incompletenessbias on the B-band Tully-Fisher relation. The data are well fitted by atheoretical curve that is obtained for a Hubble constant value of 72 +or - 5 km/sec per Mpc in the de Vaucouleurs local scale, confirming theconstant's previous determination in light of a study of the Malmquistbias for field galaxies. The true value for the Hubble constant isconcluded to lie within the 50-75 range, depending on the primarycalibration.
|The kinematics of stars and gas in radio galaxies|
New data on the stellar kinematics of 12 elliptical galaxies associatedwith powerful double radio sources are presented and combined withsimilar published data on nine other such galaxies. The data show thatthe parent galaxies of radio sources do not as a class, or even onaverage, exhibit rapidly rotating stellar components when compared withnormal elliptical galaxies. There are indications that high rotationspeeds may be related to galaxy interactions or mergers. No strongevidence is found for good alignment between the radio ejection andstellar rotation axes, even for large and/or powerful radio sourceswhere such an alignment has been previously suggested. The datademonstrate that large radio sources are usually well aligned with therotation axis of the emission line gas, while small sources apparentlyare not.
|Inner ring structures in galaxies as distance indicators. III - Distances to 453 spiral and lenticular galaxies|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983ApJS...51..149B&db_key=AST