کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1764720 | 1020068 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A multi-epoch study of the C IV absorption variability in the broad absorption line quasar APM 08279+5255
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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![عکس صفحه اول مقاله: A multi-epoch study of the C IV absorption variability in the broad absorption line quasar APM 08279+5255 A multi-epoch study of the C IV absorption variability in the broad absorption line quasar APM 08279+5255](/preview/png/1764720.png)
چکیده انگلیسی
Broad absorption line (BAL) variability potentially represents a powerful tool to investigate the physical nature and the structure of gas outflows in active galactic nuclei. Most existing BAL variability studies rely on observations taken at a few epochs for samples of tens of BAL QSOs. In this study we present the first “monitoring” of a single object, APM 08279+5255, which has been observed more than 20 times since 2003. All available spectra from the literature have also been analysed, including two high resolution spectra, extending the time interval from 1998 to 2012. A relative stability of the shape of the absorption profile is found. At the same time significant variations of the equivalent width are observed. A correlation of the BAL equivalent width with the QSO luminosity is found for the first time. These results suggest that changes in the ionisation state of the gas are causing opacity changes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 54, Issue 7, 1 October 2014, Pages 1434-1438
Journal: Advances in Space Research - Volume 54, Issue 7, 1 October 2014, Pages 1434-1438
نویسندگان
F.G. Saturni, D. Trevese, F. Vagnetti, M. Perna,