NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00535007" target="_blank" >RIV/67985815:_____/20:00535007 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/staa1820" target="_blank" >https://doi.org/10.1093/mnras/staa1820</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staa1820" target="_blank" >10.1093/mnras/staa1820</a>

Jazyk výsledku

angličtina

Název v původním jazyce

NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?

Popis výsledku v původním jazyce

We present NuSTAR (Nuclear Spectroscopic Telescope Array) observations of four active galactic nuclei (AGNs) located within 15 Mpc. These AGNs, namely ESO 121-G6, NGC 660, NGC 3486, and NGC 5195, have observed X-ray luminosities of L-2-10 keV,L-obs less than or similar to 10(39) erg s(-1), classifying them as low-luminosity AGN (LLAGN). We perform broad-band X-ray spectral analysis for the AGN by combining our NuSTAR data with Chandra or XMM-Newton observations to directly measure their column densities (N-H) and infer their intrinsic power. We complement our X-ray data with archival and new high-angular resolution mid-infrared (mid-IR) data for all objects, except NGC 5195. Based on our X-ray spectral analysis, we found that both ESO 121-G6 and NGC 660 are heavily obscured (N-H > 10(23) cm(-2), L-2-10 keV,L-int similar to 10(41) erg s(-1)), and NGC 660 may be Compton thick. We also note that the X-ray flux and spectral slope for ESO 121-G6 have significantly changed over the last decade, indicating significant changes in the obscuration and potentially accretion rate. On the other hand, NGC 3486 and NGC 5195 appear to be unobscured and just mildly obscured, respectively, with L-2-10 keV,L-int < 10(39) erg s(-1), i.e. genuine LLAGN. Both of the heavily obscured AGNs have L-bol > 10(41) erg s(-1) and lambda(Edd) greater than or similar to 10(-3), and are detected in high-angular resolutionmid-IR imaging, indicating the presence of obscuring dust on nuclear scale. NGC 3486, however, is undetected in high-resolution mid-IR imaging, and the current data do not provide stringent constraints on the presence or absence of obscuring nuclear dust in the AGN.

Název v anglickém jazyce

NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?

Popis výsledku anglicky

We present NuSTAR (Nuclear Spectroscopic Telescope Array) observations of four active galactic nuclei (AGNs) located within 15 Mpc. These AGNs, namely ESO 121-G6, NGC 660, NGC 3486, and NGC 5195, have observed X-ray luminosities of L-2-10 keV,L-obs less than or similar to 10(39) erg s(-1), classifying them as low-luminosity AGN (LLAGN). We perform broad-band X-ray spectral analysis for the AGN by combining our NuSTAR data with Chandra or XMM-Newton observations to directly measure their column densities (N-H) and infer their intrinsic power. We complement our X-ray data with archival and new high-angular resolution mid-infrared (mid-IR) data for all objects, except NGC 5195. Based on our X-ray spectral analysis, we found that both ESO 121-G6 and NGC 660 are heavily obscured (N-H > 10(23) cm(-2), L-2-10 keV,L-int similar to 10(41) erg s(-1)), and NGC 660 may be Compton thick. We also note that the X-ray flux and spectral slope for ESO 121-G6 have significantly changed over the last decade, indicating significant changes in the obscuration and potentially accretion rate. On the other hand, NGC 3486 and NGC 5195 appear to be unobscured and just mildly obscured, respectively, with L-2-10 keV,L-int < 10(39) erg s(-1), i.e. genuine LLAGN. Both of the heavily obscured AGNs have L-bol > 10(41) erg s(-1) and lambda(Edd) greater than or similar to 10(-3), and are detected in high-angular resolutionmid-IR imaging, indicating the presence of obscuring dust on nuclear scale. NGC 3486, however, is undetected in high-resolution mid-IR imaging, and the current data do not provide stringent constraints on the presence or absence of obscuring nuclear dust in the AGN.

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/GJ19-05599Y" target="_blank" >GJ19-05599Y: Sjednocení černých děr napříč hmotností</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

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

1365-2966

e-ISSN

—

Svazek periodika

497

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

229-245

Kód UT WoS článku

000574919600018

EID výsledku v databázi Scopus

2-s2.0-85096953716