Details

Autor(en) / Beteiligte

• Steinhardt, Charles L
• Silverman, John D

Titel

Quasars with Anomalous Hβ Profiles. I. Demographics

Ist Teil von

• Publications of the Astronomical Society of Japan, 2013-08, Vol.65 (4)

Ort / Verlag

Oxford, UK: Oxford University Press

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The H $\beta$ emission line in a typical Type I quasar is composed of a broad base and a narrow core, with the core velocity characteristic of narrow-line region emission, and line-fitting routines typically assume this picture. We test the effects of removing this constraint, and find a substantial group of Type I quasars in the Sloan Digital Sky Survey catalog with H $\beta$ emission line cores broader than 1200 km s $^{-1}$ , above the velocity believed possible for gas in the quasar narrow-line region. We identify this group of “anomalous H $\beta$ quasars” (AHQs) as a distinct population because of a variety of spectral and photometric signatures common to these AHQs but atypical of other quasars. These features are similar to some aspects of narrow-line Seyfert 1s and correlations identified by Eigenvector 1, but also contain distinct features that make it difficult to classify AHQs. We demonstrate that AHQs comprise at least 11% and most likely approximately one quarter of the SDSS Type I quasar population at 0.2 $<$ z $<$ 0.8. For AHQs, the [O iii] $\lambda$ 4959, 5007 profile is often better fit by de-linking it from the H $\beta$ core, while a more standard linked fit produces a tight correlation between narrow- and broad-line velocities. We find that [O iii] in AHQs sometimes has a standard narrow-line profile and other times matches the H $\beta$ core, but is rarely in between the two, implying that the broadened core emission arises from a distinct physical region. Another feature of AHQs is a diminished [O ii] line, which might indicate a connection between AHQs and the interstellar mediums of their host galaxies, through reduced photoionization or star formation. We find that it is difficult to produce AHQs using the current quasar standard model.