| ZAJAČEK, Michal, Bozena CZERNY, Narayan KHADKA, Mary Loli MARTÍNEZ-ALDAMA, Raj PRINCE, Swayamtrupta PANDA and Bharat RATRA. Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements. Astrophysical Journal. IOS Publishing, 2024, vol. 961, No 2, p. 1-18. ISSN 0004-637X. Available from: https://dx.doi.org/10.3847/1538-4357/ad11dc. |
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@article{2385305,
author = {Zajaček, Michal and Czerny, Bozena and Khadka, Narayan and MartínezandAldama, Mary Loli and Prince, Raj and Panda, Swayamtrupta and Ratra, Bharat},
article_number = {2},
doi = {http://dx.doi.org/10.3847/1538-4357/ad11dc},
keywords = {Cosmology; Cosmological parameters; Observational cosmology; Dark energy; Active galaxies; Quasars; Emission lines; Interstellar dust extinction},
language = {eng},
issn = {0004-637X},
journal = {Astrophysical Journal},
title = {Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements},
url = {https://ui.adsabs.harvard.edu/abs/2024ApJ...961..229Z/abstract},
volume = {961},
year = {2024}
}
TY - JOUR
ID - 2385305
AU - Zajaček, Michal - Czerny, Bozena - Khadka, Narayan - Martínez-Aldama, Mary Loli - Prince, Raj - Panda, Swayamtrupta - Ratra, Bharat
PY - 2024
TI - Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements
JF - Astrophysical Journal
VL - 961
IS - 2
SP - 1-18
EP - 1-18
PB - IOS Publishing
SN - 0004637X
KW - Cosmology
KW - Cosmological parameters
KW - Observational cosmology
KW - Dark energy
KW - Active galaxies
KW - Quasars
KW - Emission lines
KW - Interstellar dust extinction
UR - https://ui.adsabs.harvard.edu/abs/2024ApJ...961..229Z/abstract
N2 - In Khadka et al., a sample of X-ray-detected reverberation-mapped quasars was presented and applied for the comparison of cosmological constraints inferred using two well-established relations in active galactic nuclei-the X-ray/UV luminosity (L X -L UV) relation and the broad-line region radius-luminosity (R-L) relation. L X -L UV and R-L luminosity distances to the same quasars exhibit a distribution of their differences that is generally asymmetric and positively shifted for the six cosmological models we consider. We demonstrate that this behavior can be interpreted qualitatively as arising as a result of the dust extinction of UV/X-ray quasar emission. We show that the extinction always contributes to the nonzero difference between L X -L UV-based and R-L-based luminosity distances and we derive a linear relationship between the X-ray/UV color index E X-UV and the luminosity-distance difference, which also depends on the value of the L X -L UV relation slope. Taking into account the median and the peak values of the luminosity-distance difference distributions, the average X-ray/UV color index falls in the range of E over bar X-UV=0.03-0.28 mag for the current sample of 58 sources. This amount of extinction is typical for the majority of quasars and can be attributed to the circumnuclear and interstellar media of host galaxies. After applying the standard hard X-ray and far-UV extinction cuts, heavily extincted sources are removed but overall the shift toward positive values persists. The effect of extinction on luminosity distances is more pronounced for the L X -L UV relation since the extinction of UV and X-ray emissions both contribute.
ER -
ZAJAČEK, Michal, Bozena CZERNY, Narayan KHADKA, Mary Loli MARTÍNEZ-ALDAMA, Raj PRINCE, Swayamtrupta PANDA and Bharat RATRA. Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements. \textit{Astrophysical Journal}. IOS Publishing, 2024, vol.~961, No~2, p.~1-18. ISSN~0004-637X. Available from: https://dx.doi.org/10.3847/1538-4357/ad11dc.
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