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61 papers · 2 filters
Optical and X-ray monitoring of the NLS1 galaxy Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +3
The Narrow-line Seyfert galaxy Ark 564 was monitored between June 04, 2000 and June 24, 2000 from Skinakas Observatory. The B,V,R and I band light curves show night to night variat…
Optical/Infrared Survey of Galaxy Clusters
Luiz da Costa, S. Arnouts, S. Bardelli +13
In this contribution the ongoing effort to build a statistical sample of clusters of galaxies over a wide range of redshifts to study the evolution of clusters and member galaxies…
B1359+154: A Six Image Lens Produced by a z=1 Compact Group of Galaxies
D. Rusin, C. S. Kochanek, M. Norbury +8
HST V and I-band observations show that the gravitational lens B1359+154 consists of six images of a single z_s=3.235 radio source and its star-forming host galaxy, produced by a c…
Stereo Imaging of the VHE Gamma-Rays with HEGRA and H.E.S.S
Alexander K Konopelko
At present, the ground-based astronomy of very high energy (VHE) (E>100 GeV) gamma-rays experiences the challenging transition phase caused by the substantial upgrading of its obse…
Simulations of Deep Pencil-Beam Redshift Surveys
N. Yoshida, J. Colberg, S. D. M. White +9
We create mock pencil-beam redshift surveys from very large cosmological -body simulations of two Cold Dark Matter cosmogonies, an Einstein-de Sitter model (CDM) and a flat m…
On the Probability of Microlensing in GRB Afterglows
L. V. E. Koopmans, J. Wambsganss
The declining lightcurve of the optical afterglow of gamma-ray burst GRB000301C showed rapid variability with one particularly bright feature at about t-t0=3.8 days. This event was…