Results 81 to 90 of about 89,220 (323)

Active Galactic Nucleus Feedback in an Elliptical Galaxy with the Most Updated AGN Physics. I. Low Angular Momentum Case [PDF]

, 2017
We investigate the effects of AGN feedback on the cosmological evolution of an isolated elliptical galaxy by performing two-dimensional high-resolution hydrodynamical numerical simulations. The inner boundary of the simulation is chosen so that the Bondi
F. Yuan, D. Yoon, Ya-Ping Li, Z. Gan, L. Ho, Fulai Guo   +5 more
semanticscholar   +1 more source

Observational limits on type 1 active galactic nucleus rate in COSMOS [PDF]

, 2009
We present black hole masses and accretion rates for 182 Type 1 active galactic nuclei (AGNs) in COSMOS. We estimate masses using the scaling relations for the broad H β, Mg ii, and C iv emission lines in the redshift ranges 0.16 < z < 0.88, 1 < z < 2 ...
Bongiorno, Angela, Brusa, Marcella, Cappelluti, Nico, Elvis, Martin, Gabor, Jared, Hao, Heng, Huchra, John P., Impey, Chris D., Kelly, Brandon C., Koekemoer, A., McCarthy, Patrick J., Merloni, Andrea, Nagao, Tohru, Salvato, Mara, Scoville, Nick Z., Trump, Jonathan R.   +15 more
core  

A Candidate Dual Active Galactic Nucleus At Z=1.175 [PDF]

, 2012
The X-ray source CXOXBJ142607.6+353351 (CXOJ1426+35), which was identified in a 172 ks Chandra image in the Bootes field, shows double-peaked rest-frame optical/UV emission lines, separated by 0.''69 (5.5 kpc) in the spatial dimension and by 690 km s(-1)
Assef, Roberto J., Barrows, R. Scott, Comerford, Julia M., Cushing, Michael C., Fassnacht, Christopher D., Gonzalez, Anthony H., Griffith, Roger, Harrison, Fiona, Hickox, Ryan, Kirkpatrick, J. Davy, Lagattuta, David J., Madsen, Kristin, Stern, Daniel   +12 more
core   +2 more sources

ACTIVE GALACTIC NUCLEUS HOST GALAXY MORPHOLOGIES IN COSMOS [PDF]

The Astrophysical Journal, 2009
We use HST/ACS images and a photometric catalog of the COSMOS field to analyze morphologies of the host galaxies of approximately 400 AGN candidates at redshifts 0.3 < z < 1.0. We compare the AGN hosts with a sample of non-active galaxies drawn from the COSMOS field to match the magnitude and redshift distribution of the AGN hosts. We perform 2-D
J. M. Gabor, C. D. Impey, K. Jahnke, B. D. Simmons, J. R. Trump, A. M. Koekemoer, BRUSA, MARCELLA, N. Cappelluti, E. Schinnerer, V. Smolčić, M. Salvato, J. D. Rhodes, B. Mobasher, P. Capak, R. Massey, A. Leauthaud, N. Scoville   +16 more
openaire   +6 more sources

Active galactic nucleus and dwarf galaxy gas kinematics [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT We present spatially resolved kinematic measurements of stellar and ionized gas components of dwarf galaxies in the stellar mass range $10^{8.5}\!-\!10^{10} \, \mathrm{M}_{\odot }$, selected from Sloan Digital Sky Survey DR7 and DR8 and followed up with Keck/Low-Resolution Imaging Spectrometer spectroscopy.
Christina M Manzano-King, Gabriela Canalizo   +1 more
openaire   +2 more sources

Atomic‐Scale Insights into Nanoparticle Exsolution at Dislocations in Dislocation‐Engineered Catalysts

Advanced Materials, EarlyView.
This study reveals an atomic‐level correlation between bulk dislocations and the exsolution of surface nanoparticles through a novel approach for dislocation engineering in epitaxial thin films. Employing in situ scanning transmission electron microscopy, two primary reasons for the frequent nucleation of dislocation‐associated nanoparticles are ...
Moritz Lukas Weber, Moritz Kindelmann, Dylan Jennings, Jan Hölschke, Regina Dittmann, Joachim Mayer, Wolfgang Rheinheimer, Xufei Fang, Felix Gunkel   +8 more
wiley   +1 more source

Retrograde infall of the intergalactic gas onto S-galaxy and activity of galactic nuclei

Open Astronomy
We present the results of numerical simulations focused on the accretion of intergalactic gas onto a gas-rich S-type disc galaxy. Our investigation explores the conditions favouring the emergence of counterrotating stellar and gaseous components within ...
Khrapov Sergey S., Khoperskov Alexander V.   +1 more
doaj   +1 more source

The Spatially Uniform Spectrum of the Fermi Bubbles: The Leptonic Active Galactic Nucleus Jet Scenario [PDF]

, 2017
The Fermi bubbles are among the most important findings of the Fermi Gamma-ray Space Telescope; however, their origin is still elusive. One of the unique features of the bubbles is that their gamma-ray spectrum, including a high-energy cutoff at ∼110 GeV
H. Yang, M. Ruszkowski
semanticscholar   +1 more source

VLBI Observations of NGC6240: resolving the double nuclei and radio supernovae

, 2011
The European VLBI Network (EVN) has been used at two epochs in 2003 and 2009 to obtain multi-frequency high-resolution images of the merger galaxy NGC6240 in order to study the radio properties of all compact high-brightness components in the galaxy. Our
Baan, Bartel, Batejat, Bryant, Conway, Fried, Gallimore, Gallimore, Greenhill, Hagiwara, Hagiwara, Hans-Rainer Klöckner, Iono, Kameno, Komossa, Kovalev, Nakai, Nakanishi, Neff, Parra, Scoville, Smith, Tacconi, Thompson, Ulvestad, Willem A. Baan, Yoshiaki Hagiwara, Yun   +27 more
core   +1 more source

The Nucleus of C16.16: Another Case of a Double-peaked Active Galactic Nucleus [PDF]

The Astrophysical Journal, 1996
We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low- ionization emission lines show large equivalent widths.
Rodriguez-Ardila, A., Pastoriza, M. G., Bica, Eduardo, Maza Sancho, José   +3 more
openaire   +3 more sources