Joint ALMA/X-ray monitoring of the radio-quiet type 1 active galactic nucleus IC 4329A

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dc.contributor.authorShablovinskaya, E.
dc.contributor.authorRicci, C.
dc.contributor.authorChang, C. -s.
dc.contributor.authorTortosa, A.
dc.contributor.authordel Palacio, S.
dc.contributor.authorKawamuro, T.
dc.contributor.authorAalto, S.
dc.contributor.authorArzoumanian, Z.
dc.contributor.authorBalokovic, M.
dc.contributor.authorBauer, F. E.
dc.contributor.authorGendreau, K. C.
dc.contributor.authorHo, L. C.
dc.contributor.authorKakkad, D.
dc.contributor.authorKara, E.
dc.contributor.authorKoss, M. J.
dc.contributor.authorLiu, T.
dc.contributor.authorLoewenstein, M.
dc.contributor.authorMushotzky, R.
dc.contributor.authorPaltani, S.
dc.contributor.authorPrivon, G. C.
dc.contributor.authorSmith, K.
dc.contributor.authorTombesi, F.
dc.contributor.authorTrakhtenbrot, B.
dc.date.accessioned2025-01-20T16:05:09Z
dc.date.available2025-01-20T16:05:09Z
dc.date.issued2024
dc.description.abstractThe origin of a compact millimeter (mm, 100-250 GHz) emission in radio-quiet active galactic nuclei (RQ AGN) remains debated. Recent studies propose a connection with self-absorbed synchrotron emission from the accretion disk X-ray corona. We present the first joint ALMA (similar to 100 GHz) and X-ray (NICER/XMM-Newton/Swift; 2-10 keV) observations of the unobscured RQ AGN, IC 4329A (z = 0.016). The time-averaged mm-to-X-ray flux ratio aligns with recently established trends for larger samples, but with a tighter scatter (similar to 0.1 dex) compared to previous studies. However, there is no significant correlation on timescales of less than 20 days. The compact mm emission exhibits a spectral index of -0.23 +/- 0.18, remains unresolved with a 13 pc upper limit, and shows no jet signatures. Notably, the mm flux density varies significantly (by factor of 3) within four days, exceeding the contemporaneous X-ray variability and showing the largest mm variations ever detected in RQ AGN over daily timescales. The high amplitude variability rules out scenarios of heated dust and thermal free-free emission, pointing toward a synchrotron origin for the mm radiation in a source of similar to 1 light day (similar to 120 gravitational radii) size. While the exact source is not yet certain, an X-ray corona scenario emerges as the most plausible compared to a scaled-down jet or outflow-driven shocks.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202450133
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202450133
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89879
dc.identifier.wosidWOS:001336485200014
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgalaxies: individual: IC 4329A
dc.subjectsubmillimeter: galaxies
dc.subjectX-rays: galaxies
dc.titleJoint ALMA/X-ray monitoring of the radio-quiet type 1 active galactic nucleus IC 4329A
dc.typeartículo
dc.volumen690
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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