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BAL effect in quasars due to source orientation

Published online by Cambridge University Press:  28 October 2024

M. Sniegowska Open the ORCID record for M. Sniegowska [Opens in a new window] ,
M. H. Naddaf ,
M. L. Martinez-Aldama ,
P. Marziani ,
S. Panda  and
B. Czerny
M. Sniegowska*
Affiliation:
Center for Theoretical Physics, Polish Academy of Sciences, Lotnikow 32/46, 02-668 Warsaw, Poland Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
M. H. Naddaf*
Affiliation:
Center for Theoretical Physics, Polish Academy of Sciences, Lotnikow 32/46, 02-668 Warsaw, Poland Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
M. L. Martinez-Aldama
Affiliation:
Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Gran Bretaña 1111, Valparaíso, Chile Departamento de Astronomía, Universidad de Chile, Casilla 36D, Santiago, Chile
P. Marziani
Affiliation:
INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio, 5, 35122 Padova PD, Italy
S. Panda
Affiliation:
Laboratório Nacional de Astrofísica - Rua dos Estados Unidos 154, Bairro das Nações. CEP 37504-364, Itajubá, MG, Brazil
B. Czerny
Affiliation:
Center for Theoretical Physics, Polish Academy of Sciences, Lotnikow 32/46, 02-668 Warsaw, Poland
*
email: msniegowska@camk.edu.pl
email: naddaf@cft.edu.pl
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Abstract

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We investigated a scenario where the presence of a broad absorption line (BAL) feature in quasars (QSOs) is contingent upon the line of sight being situated within an outflow cone emanating from the source. We examined the mechanism of dust-driven winds based on the failed radiatively accelerated dusty outflow (FRADO) model proposed by Czerny & Hryniewicz, letting it be responsible for the formation of massive outflow. We calculated the probability of observing the BAL effect from the geometry of outflow which is a function of global parameters of black hole mass (M•), Eddington ratio (αEdd), and metallicity (Z). We then compared the results with prevalence of BAL QSOs in a sample of observational data from SDSS. The consistency of our model with the data supports the interpretation of the BAL phenomenon as a result of source orientation, rather than a transitory stage in AGN evolution.

Keywords

Active GalaxiesBroad Absorption LinesQuasarsDustRadiation Pressure
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S378: Black Hole Winds at All Scales , December 2023 , pp. 95 - 99
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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