Average Quasar Spectra in the Context of Eigenvector 1 | Zendy

J. W. Sulentic | Zendy; P. Marziani | Zendy; R. Zamanov | Zendy; R. Bachev | Zendy; M. Calvani | Zendy; D. DultzinHacyan | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Average Quasar Spectra in the Context of Eigenvector 1

Author(s) -

J. W. Sulentic,

P. Marziani,

R. Zamanov,

R. Bachev,

M. Calvani,

D. DultzinHacyan

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339594

Subject(s) - quasar , astrophysics , full width at half maximum , physics , spectral line , redshift , asymmetry , context (archaeology) , line (geometry) , equivalent width , centroid , eigenvalues and eigenvectors , galaxy , emission spectrum , optics , mathematics , astronomy , geometry , quantum mechanics , paleontology , biology

[LaTeX removed] Recent work has shown that it is possible to systematizequasar spectral diversity in a parameter space called ``Eigenvector 1'' (E1).We present median AGN spectra for fixed regions of the E1 (optical) parameterspace (FWHM(H-beta) vs. equivalent width ratio RFE=W(FeII4570)/W(H-beta).Comparison of the median spectra for different regions show considerabledifferences. We suggest that an E1-driven approach to median/average spectraemphasizes significant differences between AGN, and offers more insights intoAGN physics and dynamics than a single population median/average derived from alarge and heterogeneous sample of sources. We find that the H-beta broadcomponent line profile changes in shape along the E1 sequence both in averagecentroid shift and asymmetry. While objects with FWHM(H-beta)< 4000 km/s arewell fitted by a Lorentz function, AGN with FWHM(H-beta)> 4000 km/s are wellfitted if two broad line components are used: a broad (the "classical" broadline component) and a very broad/redshifted component.Comment: 1 table + 3 figures, accepted for publication in ApJ

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research