Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F24%3A00139382" target="_blank" >RIV/00216224:14310/24:00139382 - isvavai.cz</a>
Result on the web
<a href="https://ui.adsabs.harvard.edu/abs/2024ApJ...961..229Z/abstract" target="_blank" >https://ui.adsabs.harvard.edu/abs/2024ApJ...961..229Z/abstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/ad11dc" target="_blank" >10.3847/1538-4357/ad11dc</a>
Alternative languages
Result language
angličtina
Original language name
Effect of Extinction on Quasar Luminosity Distances Determined from UV and X-Ray Flux Measurements
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GX21-13491X" target="_blank" >GX21-13491X: Exploring the Hot Universe and Understanding Cosmic Feedback</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
0004-637X
e-ISSN
1538-4357
Volume of the periodical
961
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
18
Pages from-to
1-18
UT code for WoS article
001153597700001
EID of the result in the Scopus database
2-s2.0-85183989870