A1 Refereed original research article in a scientific journal
The stellar content of low redshift BL Lacertae host galaxies from multicolour imaging
Authors: Hyvonen T, Kotilainen JK, Falomo R, Orndahl E, Pursimo T
Publisher: EDP SCIENCES S A
Publication year: 2007
Journal name in sourceASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Volume: 476
Issue: 2
First page : 723
Last page: U15
Number of pages: 15
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361:20078202
Abstract
Conclusions. The blue colours are likely caused by a young stellar population component, and indicates a link between star formation caused by an interaction/ merging event and the onset of the nuclear activity. This result is corroborated by stellar population modelling, indicating a presence of young/ intermediate age populations in the majority of the sample, in agreement with low redshift quasar hosts. The lack of strong signs of interaction may require a significant time delay between the event with associated star formation episodes and the start of the nuclear activity.
Conclusions. The blue colours are likely caused by a young stellar population component, and indicates a link between star formation caused by an interaction/ merging event and the onset of the nuclear activity. This result is corroborated by stellar population modelling, indicating a presence of young/ intermediate age populations in the majority of the sample, in agreement with low redshift quasar hosts. The lack of strong signs of interaction may require a significant time delay between the event with associated star formation episodes and the start of the nuclear activity.
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