Academic Journal
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-based Monitoring of 3C 390.3
| العنوان: | Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-based Monitoring of 3C 390.3 |
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| المؤلفون: | Dietrich, M, Peterson, BM, Albrecht, P, Altmann, M, Barth, AJ, Bennie, PJ, Bertram, R, Bochkarev, NG, Bock, H, Braun, JM, Burenkov, A, Collier, S, Fang, L-Z, Hilditch, Ronald William, Horne, Keith Douglas |
| المصدر: | Dietrich , M , Peterson , BM , Albrecht , P , Altmann , M , Barth , AJ , Bennie , PJ , Bertram , R , Bochkarev , NG , Bock , H , Braun , JM , Burenkov , A , Collier , S , Fang , L-Z , Hilditch , R W & Horne , K D 1998 , ' Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-based Monitoring of 3C 390.3 ' , Astrophysical Journal Supplement Series , vol. 115 , no. 2 , .... |
| سنة النشر: | 1998 |
| مصطلحات موضوعية: | galaxies, active, individual (3C 390.3), Seyfert, SHORT-TIMESCALE VARIABILITY, MULTIWAVELENGTH OBSERVATIONS, EMISSION-LINES, RADIO GALAXIES, FE-II, 3C-390.3, CONTINUUM, NGC-5548, NGC-4151, NGC-3783 |
| الوصف: | Results of a ground-based optical monitoring campaign on 3C 390.3 in 1994-1995 are presented. The broadband fluxes (B, V, R, and I), the spectrophotometric optical continuum flux F-lambda(5177 Angstrom), and the integrated emission-line fluxes of H alpha, H beta, H gamma, He I lambda 5876, and He II lambda 4686 all show a nearly monotonic increase with episodes of milder short-term variations superposed. The amplitude of the continuum variations increases with decreasing wavelength (4400-9000 Angstrom). The optical continuum variations follow the variations in the ultraviolet and X-ray with time delays, measured from the centroids of the crosscorrelation functions, typically around 5 days, but with uncertainties also typically around 5 days; zero time delay between the high-energy and low-energy continuum variations cannot be ruled out. The strong optical emission lines H alpha, H beta, H gamma, and He I lambda 5876 respond to the high-energy continuum variations with time delays typically about 20 days, with uncertainties of about 8 days. There is some evidence that He II lambda 4686 responds somewhat more rapidly, with a time delay of around 10 days, but again, the uncertainties are quite large (similar to 8 days). The mean and rms spectra of the H alpha and H beta line profiles provide indications for the existence of at least three distinct components located at +/-4000 and 0 km s(-1) relative to the line peak. The emission-line profile variations are largest near line center. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | https://research-portal.st-andrews.ac.uk/en/researchoutput/steps-toward-determination-of-the-size-and-structure-of-the-broadline-region-in-active-galactic-nuclei-xii-groundbased-monitoring-of-3c-3903(c1d3860a-47b2-4199-8300-eff9f41aac2f).html |
| DOI: | 10.1086/313085 |
| الاتاحة: | https://research-portal.st-andrews.ac.uk/en/researchoutput/steps-toward-determination-of-the-size-and-structure-of-the-broadline-region-in-active-galactic-nuclei-xii-groundbased-monitoring-of-3c-3903(c1d3860a-47b2-4199-8300-eff9f41aac2f).html https://doi.org/10.1086/313085 http://www.scopus.com/inward/record.url?scp=0032388960&partnerID=8YFLogxK |
| Rights: | info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.69437C84 |
| قاعدة البيانات: | BASE |
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