Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mst..........2v&link_type=abstract
Masters Thesis, University of Padova, 2000
Other
3
Galaxy, Survey, Detection, Surface Photometry, Survey, Catalogue, Gaia
Scientific paper
In the framework of the feasibility studies for the GAIA mission, the opportunity of performing galaxy astrometric and photometric observations in parallel with star observations was suggested. This Thesis is the result of a study intended to demonstrate the feasibility and scientific potential of such observations. Preliminary results were presented to the Science Advisory Group established by ESA for the GAIA mission, which has now included the observation of galaxies in the mission baseline design under the name of GAIA Galaxy Survey.
The GAIA Galaxy Survey is basically a nearly all-sky, high-spatial-resolution, multi-color and multi-epoch astrometric and photometric survey of the central regions of galaxies brighter than I≃17. More than 3 million galaxies would be observed in at least 4 colors with a spatial resolution better than 0.4 arcsec. Such observations would yield a large, high-quality and uniform dataset that could be used for statistical studies of spatial distribution and core photometric structure of bright galaxies down to low Galactic latitudes. The galaxy spatial distribution on the sky will be used to probe the large-scale structure of the Local Universe, whereas high-spatial-resolution surface photometry of the galaxy innermost regions will shed light onto the wealth of structures that appear to be present at the center of most galaxies. In the foreseeable future, an observation campaign of this kind could not be carried out by other telescopes, either from the ground, due to seeing and related difficulties in star-galaxy discrimination, or from space, due to the premium on the observing time of space observatories. Galaxy observations could instead easily be obtained by GAIA with only a small effort in terms of mission design, data transmission and analysis. Besides providing the astronomers with an unprecedented wealth of fundamental information on our Galaxy, the GAIA mission could thus also yield a significant contribution to the study of external galaxies.
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