منابع مشابه
High-velocity Clouds in M 83 and M 51
Various scenarios have been proposed to explain the origin of the Galactic high-velocity clouds, predicting different distances and implying widely varying properties for the Galaxy’s gaseous halo. To eliminate the difficulties of studying the Galactic halo from within, we have embarked on a program to study anomalous neutral gas in external galaxies, and here we present the results for two nea...
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Several authors recently explored the Black-Hole mass (MBH) vs. stellar velocity dispersion (σ∗) relationship for Narrow Line Seyfert 1 galaxies (NLS1s). Their results are more or less in agreement and seem to indicate that NLS1s fill the region below the fit obtained by Tremaine et al. (2002), showing a range of σ∗ similar to that of Seyfert 1 galaxies, and a lower MBH . Until now the [O iii] ...
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We present stellar velocity dispersion (σ∗) measurements for a significant sample of 40 broad-line (Type 1) active galaxies for use in testing the well-known relation between black hole mass and stellar velocity dispersion. The objects are selected to contain Ca II triplet, Mg Ib triplet, and Ca H+K stellar absorption features in their optical spectra so that we may use them to perform extensiv...
متن کاملStellar Velocity Distribution in Galactic Disks
We present numerical studies of the properties of the stellar velocity distribution in galactic disks which have developed a saturated, two-armed spiral structure. In previous papers we used the Boltzmann moment equations (BME) up to second order for our studies of the velocity structure in self-gravitating stellar disks. A key assumption of our BME approach is the zero-heat flux approximation,...
متن کاملYoung massive star clusters in M 51
A search for young massive star clusters (YMCs) in the nearby face-on spiral galaxy M51 (NGC 5194) has been carried out using UBV CCD images from the prime focus camera on the Lick 3 meter Shane telescope. The YMC population is found to be quite rich with a specific U -band luminosity TL(U) ∼ 1.4, consistent with the high current star formation rate of this galaxy. The brightest clusters have M...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1970
ISSN: 0074-1809
DOI: 10.1017/s0074180900000346