Milimetre-band variability of the radio-quiet nucleus of NGC 7469

Ranieri D. Baldi; Ehud Behar; Ari Laor; Assaf Horesh

doi:10.1093/mnras/stv2284

Milimetre-band variability of the radio-quiet nucleus of NGC 7469

Ranieri D. Baldi^*, Ehud Behar, Ari Laor, Assaf Horesh

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

We report short-cadence monitoring of a radio-quiet (RQ) Active Galactic Nuclei (AGN), NGC 7469, at 95 GHz (3 mm) over a period of 70 d with the CARMA telescope. The AGN varies significantly (±3σ from the mean) by a factor of 2 within 4-5 d. The intrinsic 95 GHz variability amplitude in excess of the measurement noise (10 per cent) and relative to the mean flux is comparable to that in the X-rays, and much higher than at 8.4 GHz. The mm-band variability and its similarity to the X-ray variability adds to the evidence that themmand X-ray emission have the same physical origin, and are associated with the accretion disc corona.

Original language	English
Pages (from-to)	4277-4281
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	454
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stv2284
State	Published - 21 Dec 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Keywords

Galaxies: active
Galaxies: individual: NGC7469
Galaxies: jets
Galaxies: nuclei
Radio continuum: galaxies
X-rays: galaxies

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10.1093/mnras/stv2284

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title = "Milimetre-band variability of the radio-quiet nucleus of NGC 7469",

abstract = "We report short-cadence monitoring of a radio-quiet (RQ) Active Galactic Nuclei (AGN), NGC 7469, at 95 GHz (3 mm) over a period of 70 d with the CARMA telescope. The AGN varies significantly (±3σ from the mean) by a factor of 2 within 4-5 d. The intrinsic 95 GHz variability amplitude in excess of the measurement noise (10 per cent) and relative to the mean flux is comparable to that in the X-rays, and much higher than at 8.4 GHz. The mm-band variability and its similarity to the X-ray variability adds to the evidence that themmand X-ray emission have the same physical origin, and are associated with the accretion disc corona.",

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AU - Baldi, Ranieri D.

AU - Behar, Ehud

AU - Laor, Ari

AU - Horesh, Assaf

PY - 2015/12/21

Y1 - 2015/12/21

N2 - We report short-cadence monitoring of a radio-quiet (RQ) Active Galactic Nuclei (AGN), NGC 7469, at 95 GHz (3 mm) over a period of 70 d with the CARMA telescope. The AGN varies significantly (±3σ from the mean) by a factor of 2 within 4-5 d. The intrinsic 95 GHz variability amplitude in excess of the measurement noise (10 per cent) and relative to the mean flux is comparable to that in the X-rays, and much higher than at 8.4 GHz. The mm-band variability and its similarity to the X-ray variability adds to the evidence that themmand X-ray emission have the same physical origin, and are associated with the accretion disc corona.

AB - We report short-cadence monitoring of a radio-quiet (RQ) Active Galactic Nuclei (AGN), NGC 7469, at 95 GHz (3 mm) over a period of 70 d with the CARMA telescope. The AGN varies significantly (±3σ from the mean) by a factor of 2 within 4-5 d. The intrinsic 95 GHz variability amplitude in excess of the measurement noise (10 per cent) and relative to the mean flux is comparable to that in the X-rays, and much higher than at 8.4 GHz. The mm-band variability and its similarity to the X-ray variability adds to the evidence that themmand X-ray emission have the same physical origin, and are associated with the accretion disc corona.

KW - Galaxies: active

KW - Galaxies: individual: NGC7469

KW - Galaxies: jets

KW - Galaxies: nuclei

KW - Radio continuum: galaxies

KW - X-rays: galaxies

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JF - Monthly Notices of the Royal Astronomical Society

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ER -

Milimetre-band variability of the radio-quiet nucleus of NGC 7469

Abstract

Bibliographical note

Keywords

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