Emergence of double-peaked emission lines in the broad-line radio galaxy Pictor A

Details Emergence of double-peaked emission lines in the broad-line radio galaxy Pictor A Emergence of double-peaked emission lines in the broad-line radio galaxy Pictor A

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433l..17h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 1, p. L17-L20

Other

43

Accretion Disks, Active Galaxies, Astronomical Models, Balmer Series, Emission Spectra, Radio Galaxies, Visible Spectrum, Astronomical Spectroscopy, Continuums, Infrared Spectra, Mathematical Models, Radio Spectra, Spectrographs, Ultraviolet Spectra

Scientific paper

A new optical spectrum of the nearby broad-line radio galaxy (BLRG) Pictor A reveals a prominent double-peaked component of the Balmer lines which does not appear in any historical spectra of this object. Carried out with the hope of obtaining exactly such a result, this observation is a key to the interpretation of double-peaked emitters. If bolsters our previous conclusion that there is a set of additional properties which are associated with the rare class of double-peaked emitters, namely F-R II radio morphology, strong low-ionization forbidden lines, weak UV continuum, and flat far-infrared spectrum. Furthermore, the low-velocity, 'ordinary' broad Balmer lines in Pictor A remained relatively unchanged as the new twin peaks appeared, which justifies the practice of applying models that fit only the double peaks and not the low-velocity components that are often present in spectra of this type. We discuss the relative merits of accretion-disk models and other models for double-peaked emission lines in the light of this new observation.

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