Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009newar..53..209z&link_type=abstract
New Astronomy Reviews, Volume 53, Issue 7-10, p. 209-213.
Astronomy and Astrophysics
Astronomy
Scientific paper
With the availability of large data sets like the Sloan Digital Sky Survey (SDSS) is it now possible to study a huge amount of galaxy spectra in a statistical manner. The spectroscopical data set of the seventh SDSS data release covers 9380 deg2 (≈23% of the whole sky). We selected nearly 1 00 000 objects from this SDSS data release 7 that were spectroscopically classified as quasars to investigate their environment. We developed a dedicated software-pipeline to process this enormous amount of data. We classified all galaxies within the Quasar/AGN-neighbourhood of 1 Mpc according to Kauffmann (2003) and Kewley et al. (2006)by mean of a diagnostic BPT diagram. For doing this we had to measure the narrow Balmer-line components manually. Furthermore, we studied the distribution of these objects in the QSO/AGN environment as well as their spectroscopical properties and the absolute magnitudes.
Kollatschny Wolfram
Zetzl Matthias
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