A Compact Jet at the Infrared Heart of the Prototypical Low-Luminosity AGN in NGC 1052
arXiv:1903.05108 · doi:10.1093/mnras/stz716
Abstract
The feeble radiative efficiency characteristic of Low-Luminosity Active Galactic Nuclei (LLAGN) is ascribed to a sub-Eddington accretion rate, typically at . At the finest angular resolutions that are attainable nowadays using mid-infrared (mid-IR) interferometry, the prototypical LLAGN in NGC 1052 remains unresolved down to (). This is in line with non-thermal emission from a compact jet, a scenario further supported by a number of evidences: the broken power-law shape of the continuum distribution in the radio-to-UV range; the degree of polarisation measured in the nuclear mid-IR continuum, together with the mild optical extinction (); and the "harder when brighter" behaviour of the X-ray spectrum, indicative of self-Compton synchrotron radiation. A remarkable feature is the steepness of the IR-to-UV core continuum, characterised by a power-law index of , as compared to the canonical value of . Alternatively, to explain the interferometric data by thermal emission would require an exceptionally compact dust distribution when compared to those observed in nearby AGN, with to account for the IR polarisation. This is in contrast with several observational evidences against a high extinction along the line of sight, including the detection of the nucleus in the UV range and the well defined shape of the power-law continuum. The case of NGC 1052 shows that compact jets can dominate the nuclear emission in LLAGN across the whole electromagnetic spectrum, a scenario that might be common among this class of active nuclei.
Accepted for publication by MNRAS
References in corpus (25)
- The VLA Low-frequency Sky Survey
- The innermost region of AGN tori: implications from the HST/NICMOS Type 1 point sources and near-IR reverberation
- Low-Luminosity Active Galactic Nuclei: Are They UV-Faint and Radio Loud?
- AGN dust tori at low and high luminosities
- Parsec-scale dust distributions in Seyfert galaxies - Results of the MIDI AGN snapshot survey
- Resolving the innermost parsec of Centaurus A at mid-infrared wavelengths
- SPITZER IRS spectra of Virgo early type galaxies: detection of stellar silicate emission
- Revisiting the "Fundamental Plane" of Black Hole Activity at Extremely Low Luminosities
- Results from an extensive simultaneous broadband campaign on the underluminous active nucleus M81*: further evidence for mass-scaling accretion in black holes
- CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution observations
- Properties of polycyclic aromatic hydrocarbons in local elliptical galaxies revealed by the Infrared Spectrograph on Spitzer
- The spectral energy distribution of quiescent black hole X-ray binaries: new constraints from Spitzer
- MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. III. Deep VLA Images at 1.4 GHz
- A complete census of silicate features in the mid-infrared spectra of active galaxies
- Asymmetric jet production in the Active Galactic Nucleus of NGC1052
- Probing the Physics of Narrow Line Regions in Active Galaxies III: Accretion and Cocoon Shocks in the LINER NGC1052
- The Molecular Wind in the Nearest Seyfert Galaxy Circinus Revealed by ALMA
- Possible evidence for a common radial structure in nearby AGN tori
- X-ray spectral variability of LINERs selected from the Palomar sample
- AGN torus detectability at sub-millimeter wavelengths: What to expect from ALMA continuum data
- Resolving the nucleus of Centaurus A at mid-IR wavelengths
- Multi-Wavelength Polarimetry and Spectral Study of M87 Jet During 2002-2008
- Observing faint targets with MIDI at the VLTI -- The MIDI AGN Large Programme experience
- Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052
- Near-infrared Hubble Space Telescope polarimetry of a complete sample of narrow-line radio galaxies