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 journalArticlepeer-review

28 Scopus citations


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 languageAmerican English
Pages (from-to)4277-4281
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - 21 Dec 2015
Externally publishedYes

Bibliographical note

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


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


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