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Astrophysics > Astrophysics of Galaxies

Title: The mm-wave compact component of AGN

Authors: Ehud Behar (1), Stuart Vogel (2), Ranieri D. Baldi (3), Krista L. Smith (4), Richard F. Mushotzky (2) ((1), Technion, (2) University of Maryland, (3) University of Southampton, (4) Stanford University)
Abstract: mm-wave emission from Active Galactic Nuclei (AGN) may hold the key to understanding the physical origin of their radio cores. The correlation between radio/mm and X-ray luminosity may suggest a similar physical origin of the two sources. Since synchrotron self absorption decreases with frequency, mm-waves probe smaller length scales than cm-waves. We report on 100 GHz (3 mm) observations with CARMA of 26 AGNs selected from the hard X-ray Swift/BAT survey. 20/26 targets were detected at 100 GHz down to the 1 mJy (3 $\sigma$) sensitivity, which corresponds to optically thick synchrotron source sizes of 10$^{-4}$ - 10$^{-3}$ pc). Most sources show a 100 GHz flux excess with respect to the spectral slope extrapolated from low frequencies. This mm spectral component likely originates from smaller scales than the few-GHz emission. The measured mm sources lie roughly around the L$_{mm}$ (100 GHz) $\sim$ 10$^{-1}$ L$_{X}$ (2-10 keV) relation, similar to a few previously published X-ray selected sources, and hinting perhaps at a common coronal origin.
Comments: submitted to MNRAS, revised by the referee, comments welcome (9 pages, 4 figures)
Subjects: Astrophysics of Galaxies (astro-ph.GA); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1803.06877 [astro-ph.GA]
  (or arXiv:1803.06877v1 [astro-ph.GA] for this version)

Submission history

From: Ranieri Diego Baldi [view email]
[v1] Mon, 19 Mar 2018 11:41:44 GMT (91kb,D)