Double-peaked Low-Ionization Emission Lines in Active Galactic Nuclei

By I. Strateva, M. Strauss, L. Hao, David Schlegel, P. Hall, James E. Gunn, Li-Xin Li, Željko Ivezic´, Gordon Richards, N. Zakamska and 6 more. 2003

183 citations recorded by the source corpus.

We present a new sample of 116 double-peaked Balmer line active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey. Double-peaked emission lines are believed to originate in the accretion disks of AGNs, a few hundred gravitational radii (RG) from the supermassive black hole. We investigate the properties of the candidate disk emitters with respect to the full sample of AGNs over the same redshifts, focusing on optical, radio, and X-ray flux, broad-line shapes and narrow-line equivalent widths, and line flux ratios. We find that the disk emitters have medium luminosities (∼1044 ergs s-1) and FWHM on average 6 times broader than the AGNs in the parent sample. The double-peaked AGNs are 1.6 times more likely to be radio sources and are predominantly (76%) radio-quiet, with about 12% of the objects classified as LINERs. Statistical comparison of the observed double-peaked line profiles with those produced by axisymmetric and nonaxisymmetric accretion disk models allows us to impose constraints on accretion disk parameters. The observed Hα line profiles are consistent with accretion disks with inclinations smaller than 50°, surface emissivity slopes of 1.0–2.5, outer radii larger than ∼2000RG, inner radii of (200–800)RG, and local turbulent broadening of 780–1800 km s-1. The comparison suggests that 60% of accretion disks require some form of asymmetry (e.g., elliptical disks, warps, spiral shocks, or hot spots).

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/582fcb4e39154abfd5d69cd2d247edfd6ecc2580

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Citations in the corpus

Completion of a Survey and Detailed Study of Double-peaked Emission Lines in Radio-loud Active Galactic Nuclei (2003, background): “The much larger sample of 116 double-peaked emitters found in the Sloan Digital Sky Survey (SDSS; see Strateva et al. 2003) comprises 76% radio-quiet AGNs, indicating that radio-quiet double-peaked emitters are more numerous than radio-loud ones.”
Evolution of broad-line emission from active galactic nuclei (2013, background): “Such profiles are found in only about 3% of the general broad-line AGN population (Strateva et al. 2003) and most double-peak emitters have accretion rates considerably lower than the Eddington limit (Eracleous & Halpern 2003; Eracleous et al. 2009).”
A LARGE SYSTEMATIC SEARCH FOR CLOSE SUPERMASSIVE BINARY AND RAPIDLY RECOILING BLACK HOLES (2011, unknown): “To these we added two more objects listed by Strateva et al. (2003), which had not been selected by our χ2/ν > 3 condition.”
Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection (2005, background): “However, it is not always unambiguous to identify the broad H component using the above criterion, since not all emission lines are well fitted with Gaussians (Strateva et al. 2003).”
ASASSN-14ae: a tidal disruption event at 200 Mpc (2014, background): “The spectrum of the low-ionization broad-line AGN SDSS J1540-0205 (Strateva et al. 2003) does not resemble the spectrum of ASASSN-14ae in the earlier epoch but shows interesting similarities with the spectrum of ASASSN-14ae at 50 days after discovery.”
A CATALOG OF QUASAR PROPERTIES FROM SLOAN DIGITAL SKY SURVEY DATA RELEASE 7 (2010, background): “…interpreted as arising from a relativistic accretion disk around the blackhole (disk emitters, e.g., Chen et al. 1989; Eracleous & Halpern 1994; Strateva et al. 2003) although alternative interpretations exist for some of these objects, such as a binary SMBH (e.g., Gaskell 2010, and references…”
Broad-line Balmer decrements in blue active galactic nuclei (2007, background): “Such profiles are found in about 3 per cent of AGN (Strateva et al. 2003) and have a higher occurrence in LINERs (Eracleous 2004) and in RL sources (∼20%, Eracleous & Halpern 2003).”
Discovery of extreme [O III] λ5007 Å outflows in high-redshift red quasars (2015, background): “…which originate close to the black hole may be affected by outflows (e.g. Flohic, Eracleous & Bogdanović 2012), kinematics of the disc around the black hole (e.g. Eracleous & Halpern 1994; Strateva et al. 2003) and gravitational redshifts (e.g. Tremaine et al. 2014), in practice they Figure 7.”
A CONTINUUM OF H- TO He-RICH TIDAL DISRUPTION CANDIDATES WITH A PREFERENCE FOR E+A GALAXIES (2014, methodology): “We construct a circular disk model following Strateva et al. (2003), which reproduces the shape but not the location of the profile (Fig.”
Radio Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications (2006, background): “However, recent discoveries of many radio-quiet galaxies with very broad Balmer lines and hosting very massive black holes (Strateva et al. 2003; Wu & Liu 2004) strongly indicate that rareness of such objects in the Eracleous &Halpern samples might be due only to selection effects.”
Candidate Type II Quasars from the Sloan Digital Sky Survey. I. Selection and Optical Properties of a Sample at 0.3 < Z < 0.83 (2003, background): “…line (BAL) quasars (Hall et al. 2002), extremely red quasars (Richards et al. 2003), BL Lac objects (Anderson et al. 2003), and AGNs with double-peaked broad emission lines (Strateva et al. 2003), and makes it possible to find a significant number of type II quasars, as we describe in this paper.”