A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Low-redshift quasars in the SDSS Stripe 82-II. Associated companion galaxies and signature of star formation
Tekijät: Stone MB, Bettoni D, Falomo R, Kotilainen JK, Karhunen K, Paiano S, Scarpa R
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2021
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 501
Numero: 1
Aloitussivu: 419
Lopetussivu: 439
Sivujen määrä: 21
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/staa3556
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/52336240
We present optical spectroscopy of the close companions of 22 low-redshift (z < 0.5) quasars (QSO) selected from a larger sample of QSO in the SDSS Stripe82 region for which both the host galaxy and the large-scale environments have been investigated in our previous work. The new observations extend the number of QSO studied in our previous paper on close companion galaxies of 12 quasars. Our analysis here covers all 34 quasars from both this work and the previously published paper. We find that half of them (15 QSO; similar to 44 per cent) have at least one associated galaxy. Many (12 galaxies; similar to 67 per cent) of the associated companions exhibit [O II] 3727 angstrom emission line as signature of recent star formation. The star formation rate (SFR) of these galaxies is modest (median SFR similar to 4.3 M-circle dot yr(-1)). For eight QSO, we are also able to detect the starlight of the host galaxy from which three have a typical spectrum of a post-starburst galaxy. Our results suggest that quasars do not have a strong influence on the star formation of their companion galaxies.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
