Results 1 to 10 of about 102,749 (268)

Active Galaxies in the UV

Astrophysics and Space Science, 2006
In this article we present different aspects of AGN studies demonstrating the importance of the UV spectral range. Most important diagnostic lines for studying the general physical conditions as well as the metalicities in the central broad line region ...
A. Koratkar, A. Laor, A.J. Barth, A.V. Filippenko, B.M. Peterson, B.M. Peterson, C.M. Urry, D. Maoz, E. Quataert, F. Hamann, F. Hamann, F. Hamann, G.A. Kriss, G.A. Kriss, G.A. Shields, G.J. Ferland, J. Clavel, J.A. Baldwin, J.E. Scott, J.R. Gebel, K. Davidson, K. Horne, K.T. Korista, L. Ferrarese, L.C. Ho, M. Elvis, M. Rees, M.A. Dopita, M.C. Bentz, M.J. Collinge, M.P. Veron, N. Arav, P.S. Osmer, P.T. O’Brien, R. Narayan, R.C. Telfer, R.J. Weymann, R.L. White, S. Collier, S. Kaspi, T. Di Matteo, T.G. Wang, T.G. Wang, T.M. Heckman, W. Kollatschny, W. Kollatschny, W.F. Welsh, W.G. Mathews, Wang Ting-Gui, Wolfram Kollatschny   +49 more
core   +3 more sources

JWST Insight into a Lensed HST-dark Galaxy and Its Quiescent Companion at z = 2.58

The Astrophysical Journal Letters, 2023
Using the novel James Webb Space Telescope (JWST)/NIRCam observations in the A2744 field, we present a first spatially resolved overview of a Hubble Space Telescope (HST)-dark galaxy, spectroscopically confirmed at z = 2.58 with magnification μ ≈ 1.9 ...
Vasily Kokorev, Shuowen Jin, Georgios E. Magdis, Karina I. Caputi, Francesco Valentino, Pratika Dayal, Maxime Trebitsch, Gabriel Brammer, Seiji Fujimoto, Franz Bauer, Edoardo Iani, Kotaro Kohno, David Blánquez Sesé, Carlos Gómez-Guijarro, Pierluigi Rinaldi, Rafael Navarro-Carrera   +15 more
doaj   +1 more source

Testing the Radio-selection Method of Dual Active Galactic Nuclei in the Stripe 82 Field

The Astrophysical Journal, 2023
We test the merger-induced dual active galactic nuclei (dAGNs) paradigm using a sample of 35 radio galaxy pairs from the Sloan Digital Sky Survey Stripe 82 field.
Arran C. Gross, Hai Fu, A. D. Myers, S. G. Djorgovski, Joshua L. Steffen, J. M. Wrobel   +5 more
doaj   +1 more source

CLEAR: Spatially Resolved Emission Lines and Active Galactic Nuclei at 0.6 < z < 1.3

The Astrophysical Journal, 2023
We investigate spatially resolved emission-line ratios in a sample of 219 galaxies (0.6 < z < 1.3) detected using the G102 grism on the Hubble Space Telescope Wide Field Camera 3 taken as part of the CANDELS Ly α Emission at Reionization survey to ...
Bren E. Backhaus, Joanna S. Bridge, Jonathan R. Trump, Nikko J. Cleri, Casey Papovich, Raymond C. Simons, Ivelina Momcheva, Benne W. Holwerda, Zhiyuan Ji, Intae Jung, Jasleen Matharu   +10 more
doaj   +1 more source

GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469

The Astrophysical Journal Letters, 2023
We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328 ...
L. Armus, T. Lai, V. U, K. L. Larson, T. Diaz-Santos, A. S. Evans, M. A. Malkan, J. Rich, A. M. Medling, D. R. Law, H. Inami, F. Muller-Sanchez, V. Charmandaris, P. van der Werf, S. Stierwalt, S. Linden, G. C. Privon, L. Barcos-Muñoz, C. Hayward, Y. Song, P. Appleton, S. Aalto, T. Bohn, T. Böker, M. J. I. Brown, L. Finnerty, J. Howell, K. Iwasawa, F. Kemper, J. Marshall, J. M. Mazzarella, J. McKinney, E. J. Murphy, D. Sanders, J. Surace   +34 more
doaj   +1 more source

Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

The Astrophysical Journal, 2023
Active dwarf galaxies are important because they contribute to the evolution of dwarf galaxies and can reveal their hosted massive black holes. However, the sample size of such sources beyond the local universe is still highly limited.
Fan Zou, W. N. Brandt, Qingling Ni, Shifu Zhu, David M. Alexander, Franz E. Bauer, Chien-Ting J. Chen, Bin Luo, Mouyuan Sun, Cristian Vignali, Fabio Vito, Yongquan Xue, Wei Yan   +12 more
doaj   +1 more source

Deficiency of `Thin' Stellar Bars in Seyfert Host Galaxies [PDF]

, 2000
Using all available major samples of Seyfert galaxies and their corresponding control samples of closely matched non-active galaxies, we find that the bar ellipticities (or axial ratios) in Seyfert galaxies are systematically different from those in non ...
Knapen, Johan H., Peletier, Reynier F., Shlosman, Isaac   +2 more
core   +3 more sources

Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: The Low-luminosity Cases and an Application to Sgr A*

The Astrophysical Journal Letters, 2023
In this paper, we investigate the astrophysical processes of stellar-mass black holes (sMBHs) embedded in advection-dominated accretion flows (ADAFs) of supermassive black holes (SMBHs) in low-luminosity active galactic nuclei.
Jian-Min Wang, Jun-Rong Liu, Yan-Rong Li, Yu-Yang Songsheng, Ye-Fei Yuan, Luis C. Ho   +5 more
doaj   +1 more source

The distribution and lifetime of powerful radio galaxies as a function of environment and redshift

Scientific Reports, 2018
Correlations between jet power and active time for z 
David Garofalo, Chandra B. Singh, Alexa Zack   +2 more
doaj   +1 more source

Galaxy activity in merging binary galaxy clusters [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
We present the results of a study of galaxy activity in two merging binary clusters (A168 and A1750) using the Sloan Digital Sky Survey (SDSS) data supplemented with the data in the literature. We have investigated the merger histories of A168 and A1750 by combining the results from a two-body dynamical model and X-ray data.
Hwang, Ho Seong, Lee, Myung Gyoon
openaire   +2 more sources