What Gaia Will See: All-Sky Source Counts from the GSC2

Details What Gaia Will See: All-Sky Source Counts from the GSC2 What Gaia Will See: All-Sky Source Counts from the GSC2

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..163d&link_type=abstract

"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me

Computer Science

5

Gaia Photometry, Galaxy Stellar Content, Catalogs, Methods Data Analysis

Scientific paper

The Guide Star Catalogue II (GSC2) is an all-sky catalogue based on several photographic Schmidt plate surveys completed over the last century. The GSC2 has a magnitude limit of 20.5 in the photographic red passband (RF ) and nearly a billion classified objects (`stars' and `nonstars'), making it a valuable data set for Gaia mission studies. Using the known passbands of the GSC2 and Gaia, synthetic photometry is used to determine the colour transformation from the GSC2 (BJ , RF ) photometry to the Gaia G band: we find that within the GSC2 photometric errors, RF ≈ G. We therefore adopt the GSC2 counts in RF to estimate the number of sources that Gaia will detect, after correcting for blending in the GSC2, an important effect in regions of high object field density.

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