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Large-scale environments of narrow-line Seyfert 1 galaxies

Heinämäki P; Järvelä E; Poudel A; Einasto M; Lahteenmäki A; Lietzen H

dc.contributor.authorHeinämäki P
dc.contributor.authorJärvelä E
dc.contributor.authorPoudel A
dc.contributor.authorEinasto M
dc.contributor.authorLahteenmäki A
dc.contributor.authorLietzen H
dc.date.accessioned2022-10-28T14:22:08Z
dc.date.available2022-10-28T14:22:08Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/170946
dc.description.abstractStudying 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.
dc.language.isoen
dc.publisherEDP SCIENCES S A
dc.titleLarge-scale environments of narrow-line Seyfert 1 galaxies
dc.identifier.urnURN:NBN:fi-fe2021042717377
dc.relation.volume606
dc.contributor.organizationfi=Tuorlan observatorio|en=Tuorla Observatory|
dc.contributor.organizationfi=fysiikan ja tähtitieteen laitos, yhteiset|en=Department of Physics and Astronomy|
dc.contributor.organization-code2606700
dc.contributor.organization-code2606705
dc.converis.publication-id27259489
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/27259489
dc.identifier.jour-issn0004-6361
dc.okm.affiliatedauthorPoudel, Anup
dc.okm.affiliatedauthorHeinämäki, Pekka
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.publisher.countryRanskafi_FI
dc.publisher.countryFranceen_GB
dc.publisher.country-codeFR
dc.relation.articlenumberA9
dc.relation.doi10.1051/0004-6361/201731318
dc.relation.ispartofjournalAstronomy and Astrophysics
dc.year.issued2017


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