Results 21 to 30 of about 37,962 (225)

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, Nathan J. Secrest, Megan C. Johnson, Travis C. Fischer   +3 more
doaj   +1 more source

A quasi-periodic oscillation in the blazar J1359+4011 [PDF]

, 2013
The OVRO 40-m telescope has been monitoring the 15 GHz radio flux density of over 1200 blazars since 2008. The 15 GHz light curve of the flat spectrum radio quasar J1359+4011 shows a strong and persistent quasi-periodic oscillation. The time-scale of the
Hovatta, T., King, O. G., Max-Moerbeck, W., Meier, D. L., Pearson, T. J., Readhead, A. C. S., Reeves, R., Richards, J. L., Shepherd, M. C.   +8 more
core   +4 more sources

A direct image of the obscuring disk surrounding an active galactic nucleus [PDF]

, 1997
Active galactic nuclei (AGN) are generally accepted to be powered by the release of gravitational energy in a compact accretion disk surrounding a massive black hole. Such disks are also necessary to collimate powerful radio jets seen in some AGN.
A Capetti, A Efstathiou, A Lawrence, A Lawrence, CF Reynolds, Christopher P. O'Dea, DA Neufeld, DB Sanders, EA Pier, EA Pier, G Ferland, Jack F. Gallimore, JE Gunn, JF Gallimore, JF Gallimore, JF Gallimore, JH Krolik, JH Krolik, JH Krolik, JS Mulchaey, KI Kellerman, MC Begelman, MC Begelman, MJ Rees, PG Mezger, RRJ Antonucci, RRJ Antonucci, S Ueno, Stefi A. Baum, T Cornwell, TWB Muxlow   +30 more
core   +2 more sources

Modeling Nearby Low-Luminosity Active-Galactic-Nucleus Jet Images at All VLBI Scales

Galaxies, 2022
Relativistic jets from nearby low-luminosity active-galactic-nuclei (LLAGN) were observed by Very-Long Baseline Interferometry (VLBI) across many orders of magnitude in space, from milliparsec to sub-parsec scales, and from the jet base in the vicinity ...
Hung-Yi Pu, Keiichi Asada, Masanori Nakamura   +2 more
doaj   +1 more source

The parsec scale region of Active Galactic Nuclei in the IR [PDF]

, 2004
First results from the AGN-Heidelberg program aimed at spatially resolving the central pc region of the closest Active Galactic Nuclei are presented. The core region of prototype active nuclei are clearly unveiled at IR waves and at distances from the ...
Meisenheimer, Klaus, Prieto, M. Almudena
core   +2 more sources

A Diverse Population of z ∼ 2 ULIRGs Revealed by JWST Imaging

The Astrophysical Journal, 2023
Four ultraluminous infrared galaxies (ULIRGs) observed with JWST/NIRcam in the Cosmos Evolution Early Release Science program offer an unbiased preview of the z ∼ 2 ULIRG population.
J.-S. Huang, Zi-Jian Li, Cheng Cheng, Meicun Hou, Haojing Yan, S. P. Willner, Y.-S. Dai, X. Z. Zheng, J. Pan, D. Rigopoulou, T. Wang, Zhiyuan Li, Piaoran Liang, A. Esamdin, G. G. Fazio   +14 more
doaj   +1 more source

Elliptical Galaxy in the Making: The Dual Active Galactic Nuclei and Metal-enriched Halo of Mrk 273 [PDF]

, 2019
A systematic analysis of the X-ray emission from the nearby ultraluminous infrared galaxy Mrk 273 was carried out by combining new 200 ksec Chandra data with archived 44 ksec data.
Iwasawa, Kazushi, Liu, Weizhe, Max, Claire E., Melendez, Marcio, Rupke, David S. N., Sanders, David, Teng, Stacy, Tombesi, Francesco, U, Vivian, Veilleux, Sylvain   +9 more
core   +2 more sources

The Nuclear Spectral Energy Distribution of NGC 4395, The Least Luminous Type 1 Seyfert Galaxy [PDF]

, 1999
We present X-ray (ROSAT), infrared, and radio observations of NGC 4395, which harbors the optically least luminous type 1 Seyfert nucleus discovered thus far.
Alexei V. Filippenko, Andrea Comastri, Casali M. M., Edward C. Moran, Hasinger G., Joseph C. Shields, Luis C. Ho, Padovani P., Pfeffermann E., Reynolds C. S., Richard A. Sramek, Steven L. Snowden, Tomaso Belloni, Walter R.   +13 more
core   +2 more sources

New Conformally Invariant Born–Infeld Models and Geometrical Currents

Physics
A new conformally invariant gravitational generalization of the Born–Infeld (BI) model is proposed and analyzed from the point of view of symmetries. Taking a geometric identity involving the determinant functions detfBμν, Fμν with the Bach Bμν and the ...
Diego Julio Cirilo-Lombardo
doaj   +1 more source

Unmasking the Active Galactic Nucleus in PKS J2310-437

, 2009
PKS J2310-437 is an AGN with bright X-ray emission relative to its weak radio emission and optical continuum. It is believed that its jet lies far enough from the line of sight that it is not highly relativistically beamed.
A. F. Bliss, Chiaberge, D. M. Worrall, H. Tananbaum, M. Birkinshaw, Peng, Röser, S. S. Murray, Sérsic, Tananbaum, Worrall   +10 more
core   +1 more source