Zobrazeno 1 - 10
of 37
pro vyhledávání: '"RAMELLA, Massimo"'
Publikováno v:
Communicating Astronomy with the Publich, 10, 18-21 (2010)
The Virtual Observatory (VO) is an international attempt to collect astronomical data (images, simulation, mission-logs, etc), organize it and develop tools that let astronomers access this huge amount of information. The VO not only simplifies the w
Externí odkaz:
http://arxiv.org/abs/1101.3061
Here we present the development of a simplified version of double astronomical quadrant, designed for educational aims and realized on the occasion of the observational round of the XIII International Astronomy Olympiad, held in Trieste (Italy) Octob
Externí odkaz:
http://arxiv.org/abs/1002.5009
Autor:
Geller, Margaret J., Kurtz, Michael J., Dell'Antonio, Ian P., Ramella, Massimo, Fabricant, Daniel G.
Publikováno v:
Astrophys.J.709:832-850,2010
Weak lensing surveys are emerging as an important tool for the construction of "mass selected" clusters of galaxies. We evaluate both the efficiency and completeness of a weak lensing selection by combining a dense, complete redshift survey, the Smit
Externí odkaz:
http://arxiv.org/abs/0912.2364
Autor:
Geller, Margaret J., Dell'Antonio, Ian P., Kurtz, Michael J., Ramella, Massimo, Fabricant, Daniel G., Caldwell, Nelson, Tyson, J. Anthony, Wittman, David
Publikováno v:
Astrophys.J.635:L125-L128,2005
The Smithsonian Hectospec Lensing Survey (SHELS) combines a large deep complete redshift survey with a weak lensing map from the Deep Lens Survey (Wittman et al. 2002; 2005). We use maps of the velocity dispersion based on systems identified in the r
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510351
Publikováno v:
Astron.J.126:1677,2003
We measure the distribution of velocity dispersions of groups of galaxies identified in the UZC catalog; we use the distribution to derive the group mass function. We introduce a new method which makes efficient use of the entire magnitude limited ca
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308133
Publikováno v:
Astron.J. 123 (2002) 2976
We apply a friends-of-friends algorithm to the combined UZC and SSRS2 redshift surveys to construct a catalog of 1168 groups of galaxies; 411 of these groups have 5 or more members within the redshift survey. The group catalog covers 4.69 steradians
Externí odkaz:
http://arxiv.org/abs/astro-ph/0202326
Autor:
Barton, Elizabeth, Geller, Margaret J., Ramella, Massimo, Marzke, Ronald O., da Costa, L. Nicolaci
For the first time, we construct a catalog of compact groups selected from a complete, magnitude-limited redshift survey. We select groups with $N \geq 3$ members based on projected separation and association in redshift space alone. We evaluate the
Externí odkaz:
http://arxiv.org/abs/astro-ph/9608091