Mg II Line Properties in Lobe-dominated Quasars
PBN-AR
Instytucja
Centrum Fizyki Teoretycznej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
ASTROPHYSICAL JOURNAL (40pkt w roku publikacji)
ISSN
0004-637X
EISSN
Wydawca
IOP PUBLISHING LTD
DOI
URL
Rok publikacji
2018
Numer zeszytu
Strony od-do
54
Numer tomu
861
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Autorzy
Streszczenia
Język
en
Treść
We investigate the relationships between Mgiiλ2798 emission line properties, as well as between these properties and inclination angle and Feii strength, in a lobe-dominated quasar sample. We find no correlation between Mgii line width and inclination, unlike previous studies of the general quasar population. This suggests that the Mgii emission region in these objects is not of a thin disk geometry, however the average equivalent width of the line negates a spherical alternative. A positive correlation between Mgii equivalent width and inclination cannot be ruled out, meaning there is no strong evidence that Mgii emission is anisotropic. Since thin disk emission would be highly directional, the geometric implications of these two findings are compatible. The lack of line width correlation with inclination may also indicate that Mgii is useful for estimating black hole masses in lobe-dominated quasar samples, since it is unbiased by orientation. Some quasars in our sample have almost edge-on viewing angles and therefore cannot have a smooth toroidal obscurer co-planar with the accretion disk. Alternatives may be a distorted dusty disk or a clumpy obscurer. This could result from the sample selection bias towards high inclination objects, rather than intrinsic differences between lobe-dominated and typical quasars. Five objects have visible [Oiii] allowing equivalent width calculation, revealing it to be higher than in typical quasars. Since these objects are of high inclination, this finding supports the positive correlation between [Oiii] equivalent width and inclination found in a previous study.
Cechy publikacji
discipline:Astronomia
discipline:Fizyka
discipline:Astronomy
discipline:Physics
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.
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System-identifier
PBN-R:873157
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