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Dynamical properties of compact groups of galaxies
Radial velocities are presented for 457 galaxies in the 100 Hickson compact groups. More than 84 percent of the galaxies measured have velocities within 1000 km/s of the median velocity in the group.Expand
THE LUMINOSITY FUNCTION OF THE FOSSIL GROUP RX J1552.2+2013
We determine the first fossil group luminosity function based on spectroscopy of the member galaxies. The fossil group RX J1552.2+2013 has 36 confirmed members, is at a mean redshift of 0.136, andExpand
Fossil Groups in the Sloan Digital Sky Survey
A search for fossil groups in the Sloan Digital Sky Survey was performed using virtual observatory tools. A cross-match of the positions of all SDSS luminous red galaxies (with r < 19 and measuredExpand
Velocity Dispersion, Mass, and the Luminosity Function of the Fossil Cluster RX J1416.4+2315
We study the properties of the fossil cluster RX J1416.4+2315 through g'- and i'-band imaging and spectroscopy of 25 member galaxies. The system is at a mean redshift of 0.137 and has a velocityExpand
The luminosity function of compact groups of galaxies
An analysis of the luminosity function of the galaxies in Hickson's sample of compact groups (HCG) is presented. The luminosities of compact group galaxies are consistent with their being drawn fromExpand
On the mass-to-light ratios of fossil groups: Are they simply dark clusters?
Defined as X-ray bright galaxy groups with large differences between the luminosities of their brightest and second brightest galaxies, ‘fossil groups’ are believed to be some of the oldest galaxyExpand
AN OPTICAL AND X-RAY STUDY OF THE FOSSIL GROUP RX J1340.6+4018*
Fossil groups are systems with one single central elliptical galaxy and an unusual lack of luminous galaxies in the inner regions. The standard explanation for the formation of these systems suggestsExpand
Variable stars in the Ursa Minor dwarf galaxy
De nouvelles donnees photometriques (CCD et photographiques) de la galaxie naine UMi permettent l'etude detaillee d'environ 95 etoiles variables appartenant a cette galaxie. Pour 88 d'entre elles lesExpand
An accurate cluster selection function for the J-PAS narrow-band wide-field survey
The impending Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS) will be the first wide-field survey of ≳ 8500 deg^2 to reach the ‘stage IV’ category. Because of theExpand
The K Luminosity-Metallicity Relation for Dwarf Galaxies and the Tidal Dwarf Galaxies in the Tails of HCG 31
We determine a K-band luminosity-metallicity (K-Z) relation for dwarf irregular galaxies, over a large range of magnitudes, -20.5 < M_K < -13.5, using a combination of K photometry from either theExpand
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