کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1780094 | 1523792 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
QSO/AGN environments at different redshifts
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 9380Â deg2 (â23% of the whole sky). We selected nearly 1Â 00Â 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 1Â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy Reviews - Volume 53, Issues 7â10, JulyâOctober 2009, Pages 209-213
Journal: New Astronomy Reviews - Volume 53, Issues 7â10, JulyâOctober 2009, Pages 209-213
نویسندگان
M. Zetzl, W. Kollatschny,