Results 81 to 90 of about 253,449 (279)

The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release

The Astrophysical Journal Supplement Series
We present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey.
Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper, Dustin Davis, Donald P. Schneider, Matt J. Jarvis, Daniel J. Farrow, Steven L. Finkelstein, Óscar A. Chávez Ortiz, The HETDEX Collaboration   +9 more
doaj   +1 more source

A new delivery route to Galactic Nuclei: Warm halo cloud impacts

, 2010
We propose a new mechanism for the delivery of gas to the heart of galactic nuclei. We show that warm halo clouds must periodically impact galactic centers and potentially deliver a large (~10^{4-6} M_{solar}) mass of gas to the galactic nucleus in a ...
Blitz, Cavaliere, Chynoweth, Ciotti, Ciotti, Constantin, Dekel, Edmunds, Fall, Ferrarese, Gultekin, Heitsch, Hopkins, Kawakatu, Krolik, Kwak, Lockman, McKernan, Peek, Shankar, Shen, Strickland, Thom   +22 more
core   +1 more source

The incidence of obscuration in active galactic nuclei [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
We study the incidence of nuclear obscuration on a complete sample of 1310 AGN selected on the basis of their rest-frame 2-10 keV X-ray flux from the XMM-COSMOS survey, in the redshift range 0 ...
Vincenzo Mainieri, Kazushi Iwasawa, Andrea Merloni, G. Zamorani, L. Riguccini, Fabrizio Fiore, Ezequiel Treister, John D. Silverman, Marcella Brusa, Cristian Vignali, Nico Cappelluti, David J. Rosario, M. Symeonidis, M. Symeonidis, Elisabeta Lusso, Roberto Gilli, Angela Bongiorno, Andrea Comastri, Takamitsu Miyaji, Takamitsu Miyaji, Mara Salvato, S. Berta, Benjamin Magnelli, Francesca Pozzi, E. Le Floc'h, Dieter Lutz, Anton M. Koekemoer   +26 more
openaire   +6 more sources

Integrative cross‐tissue analysis unveils complement‐immunoglobulin augmentation and dysbiosis‐related fatty acid metabolic remodeling during mammalian aging

iMeta, EarlyView.
Our study provides a comprehensive multi‐omics profile of aging, integrating proteomic, metabolomic, and metagenomic analyses across diverse tissues and plasma. We identified the synergistic amplification of the circulating complement system and tissue‐wide immunoglobulin accumulation as key molecular drivers of inflammaging.
Feng Zhang, Rong Li, Yasong Liu, Jinliang Liang, Yihang Gong, Cuicui Xiao, Jianye Cai, Tingting Wang, Qiang You, Jiebin Zhang, Haitian Chen, Jiaqi Xiao, Yingcai Zhang, Yang Yang, Hua Li, Jia Yao, Qi Zhang, Jun Zheng   +17 more
wiley   +1 more source

Unobscured Type 2 Active Galactic Nuclei [PDF]

, 2010
Type 2 active galactic nuclei (AGNs) with intrinsically weak broad emission lines (BELs) would be exceptions to the unified model. After examining a number of proposed candidates critically, we find that the sample is contaminated significantly by ...
Diamond-Stanic, Aleksandar M., Donley, Jennifer, Hines, Dean, Rieke, George H., Rigby, Jane, Schmidt, Gary, Shi, Yong, Smith, Paul   +7 more
core  

Jetted Active Galactic Nuclei

, 2018
I will review the current understanding of the observational and physical properties of jetted active galactic nuclei.
openaire   +3 more sources

Variability in Active Galactic Nuclei [PDF]

International Astronomical Union Colloquium, 1993
AbstractAGN (Active Galactic Nuclei) have their profound time variability over a wide range of time scales. Although many results of AGN variability have been provided from wide band wavelength observations, I would like to concentrate the recent problems concerning a nearby region of their central engine based on the X-ray observations which are most ...
openaire   +2 more sources

Dust in Active Galactic Nuclei [PDF]

arXiv, 2008
Dust plays an essential role in the unification theory of active galactic nuclei (AGNs). This review summarizes our current understanding of the extinction and infrared emission properties of the circumnuclear dust in AGNs as well as the inferred dust composition and size distribution.
arxiv  

The wavelength dependence of polarization in active galactic nuclei [PDF]

arXiv, 2003
Using the gaseous disk model and the condition for emission based on a stimulated origin of thermal radio emission (Prigara 2003), we received the wavelength dependence of polarization for radio emission from active galactic nuclei consistent with available observational data.
arxiv  

The Galactic Center compared with nuclei of nearby galaxies [PDF]

, 2016
Understanding our Galactic Center is easier with insights from nearby galactic nuclei. Both the star formation activity in nuclear gas disks, driven by bars and nuclear bars, and the fueling of low-luminosity AGN, followed by feedback of jets, driving molecular outflows, were certainly present in our Galactic Center, which now appears to be quenched ...
arxiv   +1 more source