Results 21 to 30 of about 40,003 (204)
Search and Characterization of Remnant Radio Galaxies in the XMM-LSS Deep Field
The Astrophysical Journal, 2023 The remnant phase of a radio galaxy is characterized by the cessation of active galactic nuclei activity, resulting in the jets ceasing to feed plasma to the radio lobes.
Sushant Dutta +5 more
doaj +1 more source
Low-luminosity radio-loud active galactic nuclei [PDF]
Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN), 2007 I review observational properties of low power radio loud AGN. High resolution VLBI observations allow the estimate of the jet velocity and orientation with respect to the line of sight and the determination of the Doppler factor. These data reveal rich structures, including two-sided jets and secondary components. New results on 1144+35, a giant radio
Giovannini, Gabriele +1 more
openaire +3 more sources
The Astrophysical Journal, 2023 The sampling strategy of the Transiting Exoplanet Survey Satellite (TESS) makes TESS light curves extremely valuable for investigating the high cadence optical variability of active galactic nuclei (AGN).
Krista Lynne Smith, Lia F. Sartori
doaj +1 more source
FRAMEx. IV. Mechanical Feedback from the Active Galactic Nucleus in NGC 3079
The Astrophysical Journal, 2023 Using the Very Long Baseline Array, we observed the active galactic nucleus (AGN) in NGC 3079 over a span of six months to test for variability in the two main parsec-scale radio components, A and B , which lie on either side of the AGN.
Luis C. Fernandez +3 more
doaj +1 more source
Ultrafast outflows in radio-loud active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Recent X-ray observations show absorbing winds with velocities up to mildly-relativistic values of the order of ~0.1c in a limited sample of 6 broad-line radio galaxies. They are observed as blue-shifted Fe XXV-XXVI K-shell absorption lines, similarly to the ultra-fast outflows (UFOs) reported in Seyferts and quasars.
Tombesi F. +7 more
openaire +4 more sources
Compact radio cores in radio-quiet active galactic nuclei [PDF]
Astronomy & Astrophysics, 2016 Context. The mechanism of radio emission in radio-quiet (RQ) active galactic nuclei (AGNs) is still debated and might arise from the central AGN, from star formation activity in the host, or from either of these sources. A direct detection of compact and bright radio cores embedded in sources that are classified as RQ can unambiguously determine ...
MAINI, ALESSANDRO +4 more
openaire +4 more sources
BeppoSAXView of Radio‐loud Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2006 ApJ accepted, 33 pages, 6 ...
Grandi, Paola +2 more
openaire +2 more sources
ENERGETICS AND LIFETIMES OF LOCAL RADIO ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2015 We present a model describing the evolution of Fanaroff-Riley type I and II radio AGN, and the transition between these classes. We quantify galaxy environments using a semi-analytic galaxy formation model, and apply our model to a volume-limited low redshift ($0.03 \leqslant z \leqslant 0.1$) sample of observed AGN to determine the distribution of jet
Ross J. Turner, Stanislav S. Shabala
openaire +2 more sources
Intraday radio variability in active galactic nuclei
New Astronomy Reviews, 1999 Rapid flux density variations on timescales of the order of a day or less (Intraday Variability, IDV) in the radio regime are a common phenomenon within the blazar class. Observations with the 100m telescope of the MPIfR showed that the variations occur not only in total intensity, but also in the polarized intensity and in polarization angle.
Kraus, A., Witzel, A., Krichbaum, T. P.
openaire +2 more sources
NGC 5252: a pair of radio-emitting active galactic nuclei? [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 Abstract The X-ray source CXO J133815.6+043255 has counterparts in the UV, optical, and radio bands. Based on the multiband investigations, it has been recently proposed by Kim et al. as a rarely seen off-nucleus ultraluminous X-ray (ULX) source with a black hole mass of ≥104 M⊙ in the nearby Seyfert galaxy NGC 5252. To explore its radio
Yang, Xiaolong +9 more
openaire +4 more sources