A population of Optically Quiescent Quasars from WISE and SDSS
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00582370" target="_blank" >RIV/67985815:_____/23:00582370 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0353273" target="_blank" >https://hdl.handle.net/11104/0353273</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stad3964" target="_blank" >10.1093/mnras/stad3964</a>
Alternative languages
Result language
angličtina
Original language name
A population of Optically Quiescent Quasars from WISE and SDSS
Original language description
The growth of active galactic nuclei (AGNs) occurs under some form of obscuration in a large fraction of the population. The difficulty in constraining this population leads to high uncertainties in cosmic X-ray background and galaxy evolution models. Using an SDSS-WISE cross-match, we target infrared luminous AGN (W1 W2 > 0.8, and monochromatic rest-frame luminosity above lambda L-lambda(12 mu m) approximate to 3 x 10(44) erg s(-1)), but with passive galaxy-like optical spectra (Optically Quiescent Quasars, OQQs). We find 47 objects that show no significant [O III]lambda 5007 emission, a typically strong AGN optical emission line. As a comparison sample, we examine SDSS-selected Type 2 quasars (QSO2s), which show a significant [O III]lambda 5007 line by definition. We find a 1:16 ratio of OQQs compared to QSO2s, suggesting that the OQQ duty cycle is likely much shorter than that of QSO2s (though selection biases are not fully quantified). We consider observed properties in comparison with other galaxy types, and examine them for consistency with theories on their intrinsic nature: chiefly (a) a high covering factor for surrounding obscuring matter, preventing the detection of high-ionisation emission lines 'cocooned AGN', or (b) ionized gas being absent on the kpc scales of the Narrow Line Region (NLR), perhaps due to a 'switching on' or 'young' AGN. OQQs do not obviously fit the standard paradigm for merger-driven AGN and host galaxy evolution, implying we may be missing part of the flow of AGN evolution.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
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
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
527
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
26
Pages from-to
12065-12090
UT code for WoS article
001142376400024
EID of the result in the Scopus database
2-s2.0-85182514339