NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
NuSTAR observations of four nearby X-ray faint AGNs: low luminosity or heavy obscuration?
Original language description
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.
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/GJ19-05599Y" target="_blank" >GJ19-05599Y: Unification of Black Holes across the Mass Scale</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
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
1365-2966
e-ISSN
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Volume of the periodical
497
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
229-245
UT code for WoS article
000574919600018
EID of the result in the Scopus database
2-s2.0-85096953716