A population of Optically Quiescent Quasars from WISE and SDSS

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

A population of Optically Quiescent Quasars from WISE and SDSS

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

A population of Optically Quiescent Quasars from WISE and SDSS

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA22-22643S" target="_blank" >GA22-22643S: Galaktická gastronomie: Hrášky a Borůvky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

527

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

26

Strana od-do

12065-12090

Kód UT WoS článku

001142376400024

EID výsledku v databázi Scopus

2-s2.0-85182514339