Double-peaked Low-Ionization Emission Lines in Active Galactic Nuclei
نویسندگان
چکیده
منابع مشابه
Long-term Profile Variability of Double Peaked Emission Lines in Active Galactic Nuclei
We present up to two decades of spectroscopic monitoring of the double-peaked broad Hα emission lines of seven broad-line radio galaxies. These extremely broad, double-peaked lines are successfully modeled by emission from gas in the outer accretion disk, and their profiles vary on timescales of months to years. This variability is a valuable probe for understanding the structure and dynamics o...
متن کاملBlack hole mass and accretion rate of active galactic nuclei with double-peaked broad emission lines
Using an empirical relation between the broad line region size and optical continuum luminosity, we estimated the black hole mass and accretion rate for 135 AGNs with double-peaked broad emission lines in two samples, one from the SDSS and the other from a survey of radio-loud broad emission line AGNs. With black hole masses in a range from 3×10M⊙ to 5×10 M⊙, these AGNs have the dimensionless a...
متن کاملActive Galactic Nuclei with Double-peaked Narrow Lines: Are They Dual Agns?
Double-peaked [O III] profiles in active galactic nuclei (AGNs) may provide evidence for the existence of dual AGNs, but a good diagnostic for selecting them is currently lacking. Starting from ∼ 7000 active galaxies in SDSS DR7, we assemble a sample of 87 type 2 AGNs with double-peaked [O III] profiles. The nuclear obscuration in the type 2 AGNs allows us to determine redshifts of host galaxie...
متن کاملActive Galactic Nuclei with Double-peaked Balmer Lines: I. Black Hole Masses and the Eddington Ratios
Using the stellar population synthesis, we model the stellar contribution for a sample of 110 doublepeaked broad-lines AGNs from the Sloan Digital Sky Survey (SDSS). The stellar velocity dispersions (σ∗) are obtained for 52 double-peaked AGNs with obvious stellar absorption features, ranging from 106 to 284 km s . We also use multi-component profiles to fit [O III]λλ4959, 5007 and Hβ emission l...
متن کاملEmission-line diagnostics of low-metallicity active galactic nuclei
Current emission-line-based estimates of the metallicity of active galactic nuclei (AGN) at both high and low redshifts indicate that AGN have predominantly solar-to-supersolar metallicities. This leads to the question: do low-metallicity AGN exist? In this paper, we use photoionization models to examine the effects of metallicity variations on the narrow emission-lines from an AGN. We explore ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2003
ISSN: 0004-6256,1538-3881
DOI: 10.1086/378367