Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..193s&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Astronomy and Astrophysics
Astronomy
2
Galaxy Structure, Disc, Surveys, Methods Statistical
Scientific paper
The existence of the thick disc is now well established, although its spatial, chemical and kinematic properties are not clearly defined. As stressed by several authors, observations towards multiple directions are needed in order to resolve the correlations between the various model parameters. Here, we present a new survey over about 140 square degrees based on the material used for the construction of the Second Guide Star Catalog (GSC-II). A sample of about 20 000 K dwarfs up to 3 kpc selected from multiple fields towards high and intermediate latitudes has been analysed in order to trace the spatial distribution of the thick disc. Photometric parallaxes (30% accuracy) have been computed taking into account the systematics effects due to the Malmquist bias, the Eddington bias, the metallicity gradients, and the contamination of giants and binaries. A least-squares analysis of the seven fields supports a thick disc with a vertical scaleheight, hz 1.0 kpc and a relative density of about 5% and a radial scale-length hR 3.2 kpc, and a thin disc with hz 240 pc. Finally, the impact of the accurate astrometric measurements, including absolute parallaxes, expected from Gaia is discussed.
Bucciarelli Beatrice
Carollo Daniela
Drimmel Ronald
Lattanzi Mario G.
McLean Brian
No associations
LandOfFree
The Structure of the Thick Disc does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Structure of the Thick Disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Structure of the Thick Disc will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-898665