AustralieFrV1, PascalFrancis, Corpus, bibRecord, 002046

X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213

Identifieur interne : 002046 ( PascalFrancis/Corpus ); précédent : 002045; suivant : 002047

X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213

Auteurs : M. E. Bell ; T. Tzioumis ; P. Uttley ; R. P. Fender ; P. Arevalo ; E. Breedt ; I. Mchardy ; D. E. Calvelo ; O. Jamil ; E. Körding

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011.

RBID : Pascal:11-0081189

Descripteurs français

Pascal (Inist)
- Variabilité, Luminosité, Noyau galactique actif, Trou noir, Binaire RX, Source RX binaire, Corrélation croisée, Courbe lumière, Fonction corrélation, Observation RX, Variation temporelle, Disque accrétion, Galaxies actives, Noyau galaxies, Cosmologie, Source RX cosmique.

English descriptors

KwdEn :
- Accretion disks, Active galaxies, Active galaxy nuclei, Binary X ray source, Black holes, Correlation functions, Cosmic x-ray sources, Cosmology, Cross correlations, Galaxy nuclei, Light curves, Luminosity, Time variation, Variability, X ray observation, X-ray binary stars.

Abstract

We present the results of a ˜3 yr campaign to monitor the low-luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10^-4L_Edd, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L_R W^0.6-0.8L^0.6_X, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A08	`01`	`1`	`ENG`	`@1 X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213`
A11	`01`	`1`		`@1 BELL (M. E.)`
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A14	`01`			`@1 School of Physics and Astronomy, University of Southampton @2 Highfield, Southampton SO17 1BJ @3 GBR @Z 1 aut. @Z 3 aut. @Z 4 aut. @Z 7 aut. @Z 8 aut. @Z 9 aut.`
A14	`02`			`@1 Australia Telescope National Facility, CSIRO @2 Marsfield, NSW 2122 @3 AUS @Z 2 aut.`
A14	`03`			`@1 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1 @2 85741 Garching @3 DEU @Z 5 aut.`
A14	`04`			`@1 Departamento de Ciencias Fisicas, Universidad Andres Bello, Av. Republica 252 @2 Santiago @3 CHL @Z 5 aut.`
A14	`05`			`@1 Department of Physics, University of Warwick, Gibbet Hill Road @2 Coventry CV4 7AL @3 GBR @Z 6 aut.`
A14	`06`			`@1 AIM/CEA Saclay and University Paris Diderot, l'Orme des Merisers @2 91219 Gif-sur-vette @3 FRA @Z 10 aut.`
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C01	`01`		`ENG`	@0 We present the results of a ˜3 yr campaign to monitor the low-luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10^-4L_Edd, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L_R <is proportional to> W^0.6-0.8L^0.6_X, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.
C02	`01`	`3`		`@0 001E03`
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C03	`01`	`X`	`ENG`	`@0 Variability @5 26`
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C03	`02`	`3`	`FRE`	`@0 Luminosité @5 27`
C03	`02`	`3`	`ENG`	`@0 Luminosity @5 27`
C03	`03`	`3`	`FRE`	`@0 Noyau galactique actif @5 28`
C03	`03`	`3`	`ENG`	`@0 Active galaxy nuclei @5 28`
C03	`04`	`3`	`FRE`	`@0 Trou noir @5 29`
C03	`04`	`3`	`ENG`	`@0 Black holes @5 29`
C03	`05`	`3`	`FRE`	`@0 Binaire RX @5 30`
C03	`05`	`3`	`ENG`	`@0 X-ray binary stars @5 30`
C03	`06`	`X`	`FRE`	`@0 Source RX binaire @5 31`
C03	`06`	`X`	`ENG`	`@0 Binary X ray source @5 31`
C03	`06`	`X`	`SPA`	`@0 Fuente RX binaria @5 31`
C03	`07`	`3`	`FRE`	`@0 Corrélation croisée @5 32`
C03	`07`	`3`	`ENG`	`@0 Cross correlations @5 32`
C03	`08`	`3`	`FRE`	`@0 Courbe lumière @5 33`
C03	`08`	`3`	`ENG`	`@0 Light curves @5 33`
C03	`09`	`3`	`FRE`	`@0 Fonction corrélation @5 34`
C03	`09`	`3`	`ENG`	`@0 Correlation functions @5 34`
C03	`10`	`X`	`FRE`	`@0 Observation RX @5 35`
C03	`10`	`X`	`ENG`	`@0 X ray observation @5 35`
C03	`10`	`X`	`SPA`	`@0 Observación RX @5 35`
C03	`11`	`X`	`FRE`	`@0 Variation temporelle @5 36`
C03	`11`	`X`	`ENG`	`@0 Time variation @5 36`
C03	`11`	`X`	`SPA`	`@0 Variación temporal @5 36`
C03	`12`	`3`	`FRE`	`@0 Disque accrétion @5 37`
C03	`12`	`3`	`ENG`	`@0 Accretion disks @5 37`
C03	`13`	`3`	`FRE`	`@0 Galaxies actives @5 38`
C03	`13`	`3`	`ENG`	`@0 Active galaxies @5 38`
C03	`14`	`3`	`FRE`	`@0 Noyau galaxies @5 39`
C03	`14`	`3`	`ENG`	`@0 Galaxy nuclei @5 39`
C03	`15`	`3`	`FRE`	`@0 Cosmologie @5 40`
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C03	`16`	`3`	`ENG`	`@0 Cosmic x-ray sources @5 41`
N21				`@1 052`
N44	`01`			`@1 OTO`
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Format Inist (serveur)

NO :	PASCAL 11-0081189 INIST
ET :	X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213
AU :	BELL (M. E.); TZIOUMIS (T.); UTTLEY (P.); FENDER (R. P.); AREVALO (P.); BREEDT (E.); MCHARDY (I.); CALVELO (D. E.); JAMIL (O.); KÖRDING (E.)
AF :	School of Physics and Astronomy, University of Southampton/Highfield, Southampton SO17 1BJ/Royaume-Uni (1 aut., 3 aut., 4 aut., 7 aut., 8 aut., 9 aut.); Australia Telescope National Facility, CSIRO/Marsfield, NSW 2122/Australie (2 aut.); Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1/85741 Garching/Allemagne (5 aut.); Departamento de Ciencias Fisicas, Universidad Andres Bello, Av. Republica 252/Santiago/Chili (5 aut.); Department of Physics, University of Warwick, Gibbet Hill Road/Coventry CV4 7AL/Royaume-Uni (6 aut.); AIM/CEA Saclay and University Paris Diderot, l'Orme des Merisers/91219 Gif-sur-vette/France (10 aut.)
DT :	Publication en série; Niveau analytique
SO :	Monthly Notices of the Royal Astronomical Society; ISSN 0035-8711; Coden MNRAA4; Etats-Unis; Da. 2011; Vol. 411; No. 1; Pp. 402-410; Bibl. 3/4 p.
LA :	Anglais
EA :	We present the results of a ˜3 yr campaign to monitor the low-luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10^-4L_Edd, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L_R <is proportional to> W^0.6-0.8L^0.6_X, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.
CC :	001E03
FD :	Variabilité; Luminosité; Noyau galactique actif; Trou noir; Binaire RX; Source RX binaire; Corrélation croisée; Courbe lumière; Fonction corrélation; Observation RX; Variation temporelle; Disque accrétion; Galaxies actives; Noyau galaxies; Cosmologie; Source RX cosmique
ED :	Variability; Luminosity; Active galaxy nuclei; Black holes; X-ray binary stars; Binary X ray source; Cross correlations; Light curves; Correlation functions; X ray observation; Time variation; Accretion disks; Active galaxies; Galaxy nuclei; Cosmology; Cosmic x-ray sources
SD :	Variabilidad; Fuente RX binaria; Observación RX; Variación temporal
LO :	INIST-2067.354000193526170350
ID :	11-0081189

Links to Exploration step

Pascal:11-0081189

Le document en format XML

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<author><name sortKey="Kording, E" sort="Kording, E" uniqKey="Kording E" first="E." last="Körding">E. Körding</name>
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<front><div type="abstract" xml:lang="en">We present the results of a ˜3 yr campaign to monitor the low-luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10<sup>-4</sup>
L<sub>Edd</sub>
, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L<sub>R</sub>
  W<sup>0.6-0.8</sup>
L<sup>0.6</sup>
<sub>X</sub>
, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.</div>
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L<sub>Edd</sub>
, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L<sub>R</sub>
  W<sup>0.6-0.8</sup>
L<sup>0.6</sup>
<sub>X</sub>
, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.</s0>
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<s5>29</s5>
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<s5>30</s5>
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<ET>X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213</ET>
<AU>BELL (M. E.); TZIOUMIS (T.); UTTLEY (P.); FENDER (R. P.); AREVALO (P.); BREEDT (E.); MCHARDY (I.); CALVELO (D. E.); JAMIL (O.); KÖRDING (E.)</AU>
<AF>School of Physics and Astronomy, University of Southampton/Highfield, Southampton SO17 1BJ/Royaume-Uni (1 aut., 3 aut., 4 aut., 7 aut., 8 aut., 9 aut.); Australia Telescope National Facility, CSIRO/Marsfield, NSW 2122/Australie (2 aut.); Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1/85741 Garching/Allemagne (5 aut.); Departamento de Ciencias Fisicas, Universidad Andres Bello, Av. Republica 252/Santiago/Chili (5 aut.); Department of Physics, University of Warwick, Gibbet Hill Road/Coventry CV4 7AL/Royaume-Uni (6 aut.); AIM/CEA Saclay and University Paris Diderot, l'Orme des Merisers/91219 Gif-sur-vette/France (10 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Monthly Notices of the Royal Astronomical Society; ISSN 0035-8711; Coden MNRAA4; Etats-Unis; Da. 2011; Vol. 411; No. 1; Pp. 402-410; Bibl. 3/4 p.</SO>
<LA>Anglais</LA>
<EA>We present the results of a ˜3 yr campaign to monitor the low-luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With a reported X-ray Eddington ratio of 7 x 10<sup>-4</sup>
L<sub>Edd</sub>
, NGC 7213 can be considered to be comparable to a hard-state black hole X-ray binary. We show that a weak correlation exists between the X-ray and radio light curves. We use the cross-correlation function to calculate a global time-lag between events in the X-ray and radio bands to be 24 ± 12 d lag (8.4 GHz radio lagging X-ray) and 40 ± 13 d lag (4.8 GHz radio lagging X-ray), respectively. The radio-radio light curves are extremely well correlated with a lag of 20.5 ± 12.9 d (4.8 GHz lagging 8.4 GHz). We explore the previously established scaling relationship between core radio and X-ray luminosities and black hole mass L<sub>R</sub>
  W<sup>0.6-0.8</sup>
L<sup>0.6</sup>
<sub>X</sub>
, known as the 'Fundamental Plane of black hole activity', and show that NGC 7213 lies very close to the best-fitting 'global' correlation for the plane as one of the most-luminous LLAGNs. With a large number of quasi-simultaneous radio and X-ray observations, we explore for the first time the variations of a single AGN with respect to the Fundamental Plane. Although the average radio and X-ray luminosities for NGC 7213 are in good agreement with the Plane, we show that there is intrinsic scatter with respect to the Plane for the individual data points.</EA>
<CC>001E03</CC>
<FD>Variabilité; Luminosité; Noyau galactique actif; Trou noir; Binaire RX; Source RX binaire; Corrélation croisée; Courbe lumière; Fonction corrélation; Observation RX; Variation temporelle; Disque accrétion; Galaxies actives; Noyau galaxies; Cosmologie; Source RX cosmique</FD>
<ED>Variability; Luminosity; Active galaxy nuclei; Black holes; X-ray binary stars; Binary X ray source; Cross correlations; Light curves; Correlation functions; X ray observation; Time variation; Accretion disks; Active galaxies; Galaxy nuclei; Cosmology; Cosmic x-ray sources</ED>
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X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213

X-ray and radio variability in the low-luminosity active galactic nucleus NGC 7213

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