909 research outputs found
Easylife: the data reduction and survey handling system for VIPERS
We present Easylife, the software environment developed within the framework
of the VIPERS project for automatic data reduction and survey handling.
Easylife is a comprehensive system to automatically reduce spectroscopic data,
to monitor the survey advancement at all stages, to distribute data within the
collaboration and to release data to the whole community. It is based on the
OPTICON founded project FASE, and inherits the FASE capabilities of modularity
and scalability. After describing the software architecture, the main reduction
and quality control features and the main services made available, we show its
performance in terms of reliability of results. We also show how it can be
ported to other projects having different characteristics.Comment: pre-print, 17 pages, 4 figures, accepted for publication in
Publications of the Astronomical Society of the Pacifi
Visualization, Exploration and Data Analysis of Complex Astrophysical Data
In this paper we show how advanced visualization tools can help the
researcher in investigating and extracting information from data. The focus is
on VisIVO, a novel open source graphics application, which blends high
performance multidimensional visualization techniques and up-to-date
technologies to cooperate with other applications and to access remote,
distributed data archives. VisIVO supports the standards defined by the
International Virtual Observatory Alliance in order to make it interoperable
with VO data repositories. The paper describes the basic technical details and
features of the software and it dedicates a large section to show how VisIVO
can be used in several scientific cases.Comment: 32 pages, 15 figures, accepted by PAS
1.65 micrometers (H-band) surface photometry of galaxies. III: observations of 558 galaxies with the TIRGO 1.5m telescope
We present near-infrared H-band (1.65 micron) surface photometry of 558
galaxies in the Coma Supercluster and in the Virgo cluster. This data set,
obtained with the Arcetri NICMOS3 camera ARNICA mounted on the Gornergrat
Infrared Telescope, is aimed at complementing, with observations of mostly
early-type objects, our NIR survey of spiral galaxies in these regions,
presented in previous papers of this series. Magnitudes at the optical radius,
total magnitudes, isophotal radii and light concentration indices are derived.
We confirm the existence of a positive correlation between the near-infrared
concentration index and the galaxy H-band luminosity. (Tables 1 and 2 are only
available in electronic form upon request to [email protected])Comment: 12 pages, 6 figures. Accepted for publication in A&A
EZ: A Tool for Automatic Redshift Measurement
We present EZ (Easy redshift), a tool we have developed within the VVDS
project to help in redshift measurement from otpical spectra. EZ has been
designed with large spectroscopic surveys in mind, and in its development
particular care has been given to the reliability of the results obtained in an
automatic and unsupervised mode. Nevertheless, the possibility of running it
interactively has been preserved, and a graphical user interface for results
inspection has been designed. EZ has been successfully used within the VVDS
project, as well as the zCosmos one. In this paper we describe its architecture
and the algorithms used, and evaluate its performances both on simulated and
real data. EZ is an open source program, freely downloadable from
http://cosmos.iasf-milano.inaf.it/pandora.Comment: accepted for publication in Publications of the Astronomical Society
of the Pacifi
Data Reduction and Analysis Graphical Organizer
Spectroscopic surveys are undergoing a rapid expansion in their data
collecting capabilities, reaching the level of hundreds of spectra per
pointing. An efficient use of such huge amounts of information requires a high
degree of interconnection between the various tools involved in preparing the
observations, reducing the data, and carrying out the data analysis. DRAGO
(Data Reduction and Analysis Graphical Organizer) attempts to easy the process,
by integrating in a global framework the main data handling components: from
reduction pipelines, to data organization, plotting, and browsing tools, to
storing the data reduction results in a database for further analysis. DRAGO
allows the use of the astronomer own's preferred tools, by "plugging them in"
in an environment which handles transparently the communications between them.
See http://cosmos.mi.iasf.cnr.it/pandora .Comment: 6 pages, 9 figures, ADA III conference proceedin
1.65 micrometers (H-band) surface photometry of galaxies. IV:observations of 170 galaxies with the Calar Alto 2.2m telescope
We present near-infrared (H band) surface photometry of 170 galaxies,
obtained in 1997 using the Calar Alto 2.2m telescope equipped with the NICMOS3
camera MAGIC. The majority of our targets are selected among bright members of
the Virgo cluster, however galaxies in the A262 and Cancer clusters and in the
Coma/A1367 supercluster are also included. This data set is aimed at
complementing the NIR survey in the Virgo cluster discussed in Boselli et al.
(1997) and in the Coma Supercluster, presented in Papers I, II and III of this
series. Magnitudes at the optical radius, total magnitudes, isophotal radii and
light concentration indices are derived. (Tables 1 and 2 are only available in
electronic form upon request to [email protected])Comment: 11 pages, 6 figures. Accepted for publication in A&A
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