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7 papers · 2 filters
The Surface Density Profiles and Lensing Characteristics of Hickson's Compact Groups of Galaxies
M. L. Montoya, R. Dominguez-Tenreiro, G. Gonzalez-Casado +2
A statistical method is developed to infer the typical density profiles of poor galaxy systems without resort to binning of data or assuming a given center to each system. The meth…
Structure and kinematics of galaxy clusters II. Substructures and luminosity segregation
P. Stein
A homogeneous sample of galaxy redshifts in the core regions (R < 0.5 h Mpc) of 12 clusters is used to measure the frequency of substructure with different tests. In 50 % of…
Identification of a Gravitationally Lensed z=2.515 Star-Forming Galaxy
T. M. D. Ebbels, J. -F. Le Borgne, R. Pelló +4
We discuss the optical spectrum of a multiply-imaged arc resolved by HST in the =0.175 cluster A2218. The spectrum, obtained with LDSS-2 on the 4.2m William Herschel telescope,…
The late emission of thermonuclear supernovae
Pilar Ruiz-Lapuente
The subject of late-time emission of Type Ia supernovae and its implications for the understanding of the explosions of C+O WDs is reviewed.
The Hubble constant from Co-powered Nebular Candles
Pilar Ruiz-Lapuente
Type Ia supernovae (SNe Ia), produced by the thermonuclear explosion of white dwarf (WD) stars, are used here to derive extragalactic distances and an estimate of the Hubble consta…
Dormant dwarf spheroidal galaxies, deactivated by Type Ia supernovae
A. Burkert, P. Ruiz-Lapuente
Some dwarf spheroidal galaxies have experienced many Gyrs long periods without star formation. We show that Type Ia supernovae, formed from a first generation of stars, can delay a…