C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST20:01:25

2016A&A...596A..20V - Astronomy and Astrophysics, volume 596A, 20-20 (2016/12-1)

Data-driven dissection of emission-line regions in Seyfert galaxies.


Abstract (from CDS):

Aims. Indirectly resolving the line-emitting gas regions in distant active galactic nuclei (AGN) requires both high-resolution photometry and spectroscopy (i.e. through reverberation mapping). Emission in AGN originates on widely different scales; the broad-line region (BLR) has a typical radius less than a few parsec, the narrow-line region (NLR) extends out to hundreds of parsecs. But emission also appears on large scales from heated nebulae in the host galaxies (tenths of kpc).
Methods. We propose a novel, data-driven method based on correlations between emission-line fluxes to identify which of the emission lines are produced in the same kind of emission-line regions. We tested the method on Seyfert galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) and Galaxy Zoo project.
Results. We demonstrate the usefulness of the method on Seyfert-1s and Seyfert-2 objects, showing similar narrow-line regions (NLRs). Preliminary results from comparing Seyfert-2s in spiral and elliptical galaxy hosts suggest that the presence of particular emission lines in the NLR depends both on host morphology and eventual radio-loudness. Finally, we explore an apparent linear relation between the final correlation coefficient obtained from the method and time lags as measured in reverberation mapping for Zw 229-015.

Abstract Copyright: © ESO, 2016

Journal keyword(s): methods: statistical - galaxies: active - galaxies: nuclei - galaxies: Seyfert - quasars: emission lines - surveys

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 Mrk 142 Sy1 10 25 31.2788890554 +51 40 34.868795739   16.33 16.12     ~ 232 0
2 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2393 0
3 Z 229-15 Sy1 19 05 25.9384427813 +42 27 39.760849326   15.4       ~ 74 0

    Equat.    Gal    SGal    Ecl

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