Broad-line region physical conditions along the quasar eigenvector 1 sequence
Por:
Marziani P., Sulentic J.W., Negrete C.A., Dultzin D., Zamfir S., Bachev R.
Publicada:
11 dic 2010
Resumen:
We compare broad emission-line profiles and estimate line ratios for all major emission lines between Ly alpha and H beta in a sample of six quasars. The sources were chosen with two criteria in mind: the existence of high-quality optical and ultraviolet spectra and the possibility of sampling the spectroscopic diversity in the 4D eigenvector 1 (4DE1) context. In the latter sense, each source occupies a region (bin) in the full width at half-maximum (FWHM)(H beta) versus Fe ii(opt) strength plane that is significantly different from the others. High signal-to-noise ratio H beta emission-line profiles are used as templates for modelling the other lines (Ly alpha, C iv lambda 1549, He ii lambda 1640, Al iii lambda 1860, Si iii]lambda 1892 and Mg ii lambda 2800). We can adequately model all broad lines assuming the existence of three components distinguished by blueshifted, unshifted and redshifted centroids [indicated as a blue component (BLUE), broad component (BC) and very broad compon
Filiaciones:
Marziani P.:
INAF, Osservatorio Astronomico di Padova, Vicolo dell' Osservatorio 5, IT 35122, Padova, Italy
Sulentic J.W.:
Instituto de Astrofísica de Andalucía (CSIC), C/Camino Bajo de Huétor 50, 18008 Granada, Spain
Negrete C.A.:
Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
Dultzin D.:
Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
Zamfir S.:
Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487, United States
Bachev R.:
Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarighradsko Shousse Blvd., 1784 Sofia, Bulgaria
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