2017A&A...606A...9J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:08:23

2017A&A...606A...9J - Astronomy and Astrophysics, volume 606A, 9-9 (2017/10-1)

Large-scale environments of narrow-line Seyfert 1 galaxies.

JARVELA E., LAHTEENMAKI A., LIETZEN H., POUDEL A., HEINAMAKI P. and EINASTO M.

Abstract (from CDS):

Studying large-scale environments of narrow-line Seyfert 1 (NLS1) galaxies gives a new perspective on their properties, particularly their radio loudness. The large-scale environment is believed to have an impact on the evolution and intrinsic properties of galaxies, however, NLS1 sources have not been studied in this context before. We have a large and diverse sample of 1341 NLS1 galaxies and three separate environment data sets constructed using Sloan Digital Sky Survey. We use various statistical methods to investigate how the properties of NLS1 galaxies are connected to the large-scale environment, and compare the large-scale environments of NLS1 galaxies with other active galactic nuclei (AGN) classes, for example, other jetted AGN and broad-line Seyfert 1 (BLS1) galaxies, to study how they are related. NLS1 galaxies reside in less dense environments than any of the comparison samples, thus confirming their young age. The average large-scale environment density and environmental distribution of NLS1 sources is clearly different compared to BLS1 galaxies, thus it is improbable that they could be the parent population of NLS1 galaxies and unified by orientation. Within the NLS1 class there is a trend of increasing radio loudness with increasing large-scale environment density, indicating that the large-scale environment affects their intrinsic properties. Our results suggest that the NLS1 class of sources is not homogeneous, and furthermore, that a considerable fraction of them are misclassified. We further support a published proposal to replace the traditional classification to radio-loud, and radio-quiet or radio-silent sources with a division into jetted and non-jetted sources.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - galaxies: Seyfert - large-scale structure of Universe - large-scale structure of Universe

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO J0324+3410 BLL 03 24 41.1612231119 +34 10 45.856728058     15.72 13.1   ~ 199 1
2 87GB 164240.2+262427 Sy1 16 44 42.5339815246 +26 19 13.234204987   18.80 18.42     ~ 73 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:08:23

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