We study the luminosity function and clustering properties of subsamples of local galaxies selected from the Stromlo-APM survey by the rest-frame equivalent widths of their Hα and [O ii] emission lines. The bJ luminosity function of star-forming galaxies has a significantly steeper faint-end slope than that for quiescent galaxies: the majority of sub-L∗ galaxies are currently undergoing signifi...

X iv :0 80 6. 13 05 v1 [ as tr oph ] 8 J un 2 00 8 General Flattened Jaffe Models for Galaxies⋆ Zhenglu Jiang, Daoyuan Fang, Hongxia Liu, David Moss Department of Mathematics, Zhongshan University, Guangzhou 510275, P. R. China Department of Mathematics, Zhejiang University, Hangzhou 310027, P. R. China Department of Mathematics, Jinan University, Guangzhou 510632, P. R. China Department of Mat...

The stability of a recently proposed general relativistic model of galaxies is studied in some detail. This model is a general relativistic version of the well known MiyamotoNagai model that represents well a thick galactic disk. The stability of the disk is investigated under a general first order perturbation keeping the spacetime metric frozen (no gravitational radiation is taken into accoun...

We examine the relationship between environment and the luminosities, surface brightnesses, colors, and profile shapes of luminous galaxies in the Sloan Digital Sky Survey (SDSS). For the SDSS sample, galaxy color is the galaxy property most predictive of the local environment. Galaxy color and luminosity—measures of the star formation history—jointly comprise the most predictive pair of proper...

The Sloan Digital Sky Survey (SDSS) and photometric/spectroscopic surveys in the GOODS-South field (the Chandra Deep Field-South, CDF-S) are used to construct volume-limited, stellar massselected samples of galaxies at redshifts 0 < z < 1. The CDF-S sample at 0.6 < z < 1.0 contains 207 galaxies complete down toM = 4×10 M⊙ (for a “diet” Salpeter initial mass function), corresponding to a luminos...

We study the luminosity function and clustering properties of subsamples of local galaxies selected from the Stromlo-APM survey by the rest-frame equivalent width (EW) of the Hα emission line. The bJ luminosity function of star-forming galaxies has a significantly steeper faint-end slope than that for quiescent galaxies: the majority of sub-L galaxies are currently undergoing significant star f...

Abstract We analyse the dynamics of a single disk galaxy from general relativistic viewpoint. investigate dark matter (DM) effects in terms known family stationary axially-symmetric solutions Einstein equations coupled to rotating dust. These are generated by non-Newtonian features such and ascribed essential role frame dragging. Indeed, models, off-diagonal elements metric are, general, same o...

The occurrence of Seyfert galaxies in 6 samples representative of different cosmological environments (i.e. isolated pairs, compact and loose groups) is analysed. To avoid biases linked to subjective sample selection criteria only canonical samples, taken from the literature, are considered. It is found that the average frequency of Seyferts in all samples, is near 2%. Most Seyferts lying in pa...

An analysis of type Ia supernova (SNIa) events in early type galaxies from Evans et al. (1989) database provides strong evidence that the rate of type Ia supernovae (SNe) in radio-loud galaxies is about 6 times higher than the rate measured in radio-quiet galaxies, i.e. SNIarate(radio − loud galaxies) = 0.47 −0.15 h 2 50 SNe per century and per 10 L ⊙ (SNU) as compared to SNIa-rate(radio− quiet...