The NuSTAR local AGN N H distribution survey (NuLANDS). I. Toward a truly representative column density distribution in the local universe
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00604207" target="_blank" >RIV/67985815:_____/25:00604207 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0365909" target="_blank" >https://hdl.handle.net/11104/0365909</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/ad8236" target="_blank" >10.3847/1538-4357/ad8236</a>
Alternative languages
Result language
angličtina
Original language name
The NuSTAR local AGN N H distribution survey (NuLANDS). I. Toward a truly representative column density distribution in the local universe
Original language description
Hard X-ray-selected samples of active galactic nuclei (AGN) provide one of the cleanest views of supermassive black hole accretion but are biased against objects obscured by Compton-thick gas column densities of N-H > 10(24) cm(-2). To tackle this issue, we present the NuSTAR Local AGN N-H Distribution Survey (NuLANDS)-a legacy sample of 122 nearby (z < 0.044) AGN primarily selected to have warm infrared colors from IRAS between 25 and 60 mu m. We show that optically classified Type 1 and 2 AGN in NuLANDS are indistinguishable in terms of optical [O iii] line flux and mid-to-far-infrared AGN continuum bolometric indicators, as expected from an isotropically selected AGN sample, while Type 2 AGN are deficient in terms of their observed hard X-ray flux. By testing many X-ray spectroscopic models, we show the measured line-of-sight column density varies on average by similar to 1.4 orders of magnitude depending on the obscurer geometry. To circumvent such issues, we propagate the uncertainties per source into the parent column density distribution, finding a directly measured Compton-thick fraction of 35% +/- 9%. By construction, our sample will miss sources affected by severe narrow-line reddening, and thus segregates sources dominated by small-scale nuclear obscuration from large-scale host-galaxy obscuration. This bias implies an even higher intrinsic obscured AGN fraction may be possible, although tests for additional biases arising from our infrared selection find no strong effects on the measured column density distribution. NuLANDS thus holds potential as an optimized sample for future follow-up with current and next-generation instruments aiming to study the local AGN population in an isotropic manner.
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/GA22-22643S" target="_blank" >GA22-22643S: Galactic gastronomy: Green Peas and Blueberries</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
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
978
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
60
Pages from-to
118
UT code for WoS article
001389155800001
EID of the result in the Scopus database
2-s2.0-85215574462