Results 21 to 30 of about 193,941 (350)
Redshifts of the Gravitational Lenses MG0414+0534 and MG0751+2716 [PDF]
, 1998 We report redshifts in two gravitational lens systems, MG0414+0534 and MG0751+2716. The lens galaxy in MG0414+0534 lies at z_l=0.9584+/-0.0002. The luminosity and extreme red color of the lens are then typical of a passively evolving, early-type, ~2L ...
Christopher S. Kochanek +5 more
core +2 more sources
Optical observations of M81 galaxy group in narrow band [SII] and Hα filters: Holmberg IX [PDF]
Serbian Astronomical Journal, 2009 We present observations of the nearby tidal dwarf galaxy Holmberg IX in M81 galaxy group in narrow band [SII] and Hα filters, carried out in March and November 2008 with the 2m RCC telescope at NAO Rozhen, Bulgaria.
Arbutina B. +5 more
doaj +1 more source
Age Estimates for Galaxies in Groups [PDF]
International Astronomical Union Colloquium, 2000 AbstractWe discuss recent developments on the age and metallicity distribution for early type galaxies in different environments.
A. I. Terlevich, Duncan A. Forbes
openaire +3 more sources
Spectroscopic confirmation of a galaxy cluster associated with 7C1756+6520 at z=1.416 [PDF]
, 2010 We present spectroscopic follow-up of an overdensity of galaxies photometrically selected to be at 1 ...
A. Galametz +38 more
core +2 more sources
Studying the Patterns of the Universe
Open Astronomy, 2011 The SDSS galaxy catalog is one of the best databases for galaxy distribution studies. The SDSS DR8 data is used to construct the galaxy cluster catalog.
Sepp T. +4 more
doaj +1 more source
ALIGNMENTS OF GROUP GALAXIES WITH NEIGHBORING GROUPS [PDF]
The Astrophysical Journal, 2009 13 pages, 16 figures, accepted by ...
Xiaohu Yang +4 more
openaire +3 more sources
Mind the Gap: Tightening the Mass-Richness Relation with Magnitude Gaps [PDF]
, 2013 We investigate the potential to improve optical tracers of cluster mass by exploiting measurements of the magnitude gap, m12, defined as the difference between the r-band absolute magnitude of the two brightest cluster members.
Abazajian +33 more
core +1 more source
COMPARISON OF OPTICAL AND X-RAY MASS ESTIMATES OF THE CHANDRA GALAXY CLUSTERS AT Z < 0.1
Odessa Astronomical Publications, 2013 We used the optical data taken from SDSS DR7 galaxy and group catalog to determine the optical mass of 37 nearer Chandra galaxy clusters for comparison with the X-ray mass estimates.
Iu. V. Babyk, I. B. Vavilova
doaj +1 more source
The influence of halo assembly on galaxies and galaxy groups [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 In this paper, we study the variations of group galaxy properties according to the assembly history in SDSS-DR6 selected groups. Using mock SDSS group catalogues, we find two suitable indicators of group formation time: i) the isolation of the group, defined as the distance to the nearest neighbor in terms of its virial radius, and ii) the ...
Tatiana Zapata +4 more
openaire +5 more sources
The Centaurus Group and the Outer Halo of NGC 5128: Are they Dynamically Connected? [PDF]
, 2006 NGC 5128, a giant elliptical galaxy only $\sim 4$ Mpc away, is the dominant member of a galaxy group of over 80 probable members. The Centaurus group provides an excellent sample for a kinematic comparison between the halo of NGC 5128 and its surrounding
Kristin A. Woodley, Weinmann S. M.
core +3 more sources