A nearby luminous AGN sample optically selected from Hubble Space Telescope

Li, Shuang-Liang

doi:10.1093/mnras/stz2864

Cited by 7 publications

(18 citation statements)

References 60 publications

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“…Interestingly, such change in k is indeed observed in hot accretion flows, where depending oṅ M three distinctive accretion modes are found (Xie & Yuan 2012). We emphasis that the change in accretion mode will also result in a change in the spectral properties, which is confirmed in both BHBs and AGNs (see e.g., Yang et al 2015;Ruan et al 2019;Li 2019).…”

Section: Theoretical Interpretation Of Radio/x-ray Correlationsupporting

confidence: 58%

Radio/X-Ray Correlation in the Mini-outbursts of Black Hole X-Ray Transient GRS 1739–278

Xie

Yan

2020

ApJ

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We present quasi-simultaneous radio and X-ray observations of the black hole X-ray binary GRS 1739-278 of its 2015-2016 mini-outbursts, i.e. between 2015 June 10 and 2016 October 31, with the X-ray-to-radio time interval being less than one day. The monitor campaign was run by Swift in the X-rays and by JVLA in the radio (at both 5 GHz and 8 GHz). We find that the brightest radio emission is actually achieved during the soft sate, and the spectrum is marginally optically-thick with the spectral index α ≈ −0.28 ± 0.17 (flux F ν ∝ ν α ). For the radio emission in the hard state, we find a large diversity in the spectral index, i.e. a majority of radio spectra are optically-thick with −0.5 α 0.5, while a few are optically-thin, with α being lower than −1 in certain cases. We then investigate the correlation between the luminosities in radio (monochromatic at 5 GHz, L R ) and 1-10 keV X-rays (L X ) during the hard state. We find that for more than two orders of magnitude variation in the X-ray luminosity, this source exhibits a flat correlation with p ≈ 0.16 (in the form of L R ∝ L p X ), i.e. it belongs to the "outlier" (to the standard correlation with p ≈ 0.6) category that may follow a hybrid correlation. Both the slope and the corresponding luminosity range agree well with those in H1743-322, the prototype of the hybrid correlation. Theoretical implications of our results are discussed.

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Section: Theoretical Interpretation Of Radio/x-ray Correlationsupporting

confidence: 58%

Radio/X-Ray Correlation in the Mini-outbursts of Black Hole X-Ray Transient GRS 1739–278

Xie

Yan

2020

ApJ

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“…The average X-ray flux in RLAGNs is found to be higher than that in RQAGNs, while its origin is still unclear (e.g., Gupta et al 2018;Zhou & Gu 2020). The additional X-ray emission may be attributed to the contribution of either the jet (Wilkes & Elvis 1987;Li 2019;Zhou & Gu 2020) or the fast rotating black holes (Gupta et al 2018(Gupta et al , 2020. The spinning black hole can improve the radiative efficiency of the accretion disk Upper and lower panels: Histograms for X-ray luminosity at 2 kev and redshift, respectively, where the red slash and green regions represent the narrow-line radio galaxies and quasar samples, respectively.…”

Section: Resultsmentioning

confidence: 95%

“…x-ray emission is still unclear in RLAGNs. In observations, RLAGNs appear to have different properties than RQAGNs, for instance the positive relationships listed above in RQAGNs have not been found in RLAGNs (Li 2019;Zhou & Gu 2020). Furthermore, the average X-ray luminosity in RLAGNs is found to be 2-3 times higher than that in RQAGNs (Zamorani et al 1981;Wilkes & Elvis 1987;Wu et al 2013;Gupta et al 2018).…”

Section: Introductionmentioning

confidence: 92%

“…The accretion process can be well described by a disk-corona model in RQAGNs (Jin et al 2012;Lusso & Risaliti 2017;Qiao & Liu 2018), where the optical-UV flux is emitted from an optically thick, geometrically thin accretion disk and the hard Xray flux comes from the inverse Compton scattering of optical-UV photons by the hot corona. This model can naturally fit the observational positive relationships between α OX and λ O as well as Γ and λ O in RQAGNs (Shemmer et al 2006;Risaliti et al 2009;Lusso et al 2010;Brandt & Alexander 2015;Li 2019), where the optical to X-ray spectral index α OX is defined as α OX = 0.384 log L ν (2500 Å)/L ν (2 keV) (e.g., Lusso et al 2010), and λ O = 8.1νL ν (5100Å)/L Edd is the Eddington ratio based on the optical luminosity at 5100 Å (Runnoe et al 2012a), with L Edd being the Eddington luminosity. In contrast, the origin of X-ray A&A proofs: manuscript no.…”

Section: Introductionmentioning

confidence: 94%

“…Starting from the 3CRR catalog 1 , we firstly selected the objects with an available black hole mass estimation, thus the Eddington ratio, which is a key parameter to investigate X-ray properties, can be calculated (e.g., Brandt & Alexander 2015;Gupta et al 2018;Li 2019). The black hole masses in 84 out of the total 173 objects were measured, where all of them were taken from McLure et al (2006) or Buttiglione et al (2010).…”

Section: The Luminous Radio Galaxy Samplementioning

confidence: 99%

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The origin of X-ray emission in 3CRR sources: hints from mid-infrared Spitzer observations

Li,

2021

Preprint

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Aims. Whether X-ray emission in radio-loud (RL) active galactic nuclei (AGNs) originates from disk coronae or jets is still under debate. For example, the positive relationships in radio-quiet (RQ) AGNs (such as the optical to X-ray spectral index α OX and Eddington ration λ O as well as the X-ray photon index Γ and λ O ) are not detected in RLAGNs. We intend to further investigate this issue in this work. Methods. A sample of 27 luminous sources (including 16 quasars and 11 high-excitation radio galaxies) was selected from the 3CRR catalog to reinvestigate the origin of X-ray emission in RLAGNs, where the X-ray and mid-infrared fluxes are observed by Chandra/XMM-Newton and Spitzer, respectively. Results. It is found for the first time that there is a significant relationship between the mid-infrared to X-ray spectral index α IX and λ IR for whole sample, while there is no relationship between α OX and λ O in quasars. There are strong positive relationships between both L R -L X and L UV -L X panels, which can be well fitted by the disk-corona model. However, there is no significant relationship between Γ and λ IR . The possible reason is related to the effects of the large-scale magnetic field in RLAGNs. Conclusions. We suggest that the X-ray emission in high-excitation RLAGNs originates from a disk-corona system.

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The origin of X-ray emission in 3CRR sources: Hints from mid-infrared Spitzer observations

2021

A&A

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Aims. Whether X-ray emission in radio-loud (RL) active galactic nuclei (AGNs) originates from disk coronae or jets is still under debate. For example, the positive relationships in radio-quiet AGNs (such as the optical to X-ray spectral index αOX and Eddington ration λO as well as the X-ray photon index Γ and λO) are not detected in RLAGNs. We intend to further investigate this issue in this work. Methods. A sample of 27 luminous sources (including 16 quasars and 11 high-excitation radio galaxies) was selected from the 3CRR catalog to reinvestigate the origin of X-ray emission in RLAGNs, where the X-ray and mid-infrared fluxes are observed by Chandra/XMM-Newton and Spitzer, respectively. Results. It is found for the first time that there is a significant relationship between the mid-infrared to X-ray spectral index αIX and λIR for whole sample, while there is no relationship between αOX and λO in quasars. There are strong positive relationships between both LR − LX and LUV − LX panels, which can be well fitted by the disk-corona model. However, there is no significant relationship between Γ and λIR. The possible reason is related to the effects of the large-scale magnetic field in RLAGNs. Conclusions. We suggest that the X-ray emission in high-excitation RLAGNs originates from a disk-corona system.

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A nearby luminous AGN sample optically selected from Hubble Space Telescope

Cited by 7 publications

References 60 publications

Radio/X-Ray Correlation in the Mini-outbursts of Black Hole X-Ray Transient GRS 1739–278

Radio/X-Ray Correlation in the Mini-outbursts of Black Hole X-Ray Transient GRS 1739–278

The origin of X-ray emission in 3CRR sources: hints from mid-infrared Spitzer observations

The origin of X-ray emission in 3CRR sources: Hints from mid-infrared Spitzer observations

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