CLOUDY View of the Warm Corona
PBN-AR
Instytucja
Centrum Fizyki Teoretycznej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
ASTROPHYSICAL JOURNAL
ISSN
0004-637X
EISSN
Wydawca
IOP PUBLISHING LTD
DOI
URL
Rok publikacji
2019
Numer zeszytu
2
Strony od-do
133-145
Numer tomu
875
Identyfikator DOI
Liczba arkuszy
12.00
Autorzy
(liczba autorów: 4)
Pozostali autorzy
+ 2
Słowa kluczowe
en
accretion
accretion disks
galaxies: active
quasars: emission lines
radiative transfer
Streszczenia
Język
en
Treść
Bright active galaxies show a range of properties, but many of these properties are correlated, which has led to the concept of the quasar main sequence. We test whether our current understanding of the quasar structure allows the pattern observed in the optical plane formed by the kinematic line width of Hβ and the relative importance of the FeII optical emission to be reproduced. We performed simulations of the Hβ and FeII production using the code CLOUDY and well-justified assumptions about the broadband spectra, distance to the emission line region, and the cloud properties. We show that the presence of the warm corona is an important element of the broadband spectrum, which decreases the dependence of the relative FeII emissivity on the Eddington ratio and allows the rare cases of particularly strong FeII emitters to be reproduced. Results are sensitive to the adopted cloud distance, and strong FeII emission can be obtained either by adopting strongly supersolar metallicity or a much shorter distance than traditionally obtained from reverberation mapping. We modeled in a similar way the UV plane defined by the MgII line and FeII UV pseudo-continuum, but here our approach is less successful, in general overproducing the FeII strength. We found that the FeII optical and UV emissivity depend in a different way on the turbulent velocity and metallicity, and the best extension of the model in order to cover both planes is to allow very large turbulent velocities in the broad-line region clouds.
Cechy publikacji
discipline:Astronomia
discipline:Astronomy
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:912453
CrossrefMetadata from Crossref logo
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