Results 101 to 110 of about 76,004 (221)

The hard X-ray view of bright infrared galaxies

, 2009
Aims. The synthesis of the cosmic X-ray background (CXB) requires a large population of Compton-thick active galactic nuclei that have not been detected so far.
Akylas, Armus, Barger, Bassani, Courvoisier, Dadina, de Rosa, Franceschini, Genzel, Gilli, Gondoin, González-Martín, Grimm, Guainazzi, Kawakatu, Kennicutt, La Franca, Lebrun, Lynden-Bell, Matt, Mushotzky, N. Cabral, Paltani, R. Walter, Risaliti, Risaliti, Sanders, Schmidt, Setti, Terashima, Tozzi, Tueller, Ubertini, Vega, Vignati, Walter, Watabe, Wilkes, Wilkes, Zdziarski   +39 more
core   +1 more source

The First Triple Radio Active Galactic Nucleus in an Ongoing Galaxy Merger

The Astrophysical Journal Letters
Galaxy mergers are predicted to be a critical stage of merger-driven SMBH growth and galaxy evolution. Systems exhibiting multiple active galactic nuclei (AGN) are an important observational tool for constraining the prevalence and properties of merging ...
Emma Schwartzman, Ryan W. Pfeifle, Tracy E. Clarke, Kimberly A. Weaver, Nathan J. Secrest, Barry Rothberg, Miranda McCarthy, Daniel Stern, Peter G. Boorman, Joanna Piotrowska   +9 more
doaj   +1 more source

The Host Galaxy Fluxes of Active Galaxy Nuclei Are Generally Overestimated by the Flux Variation Gradient Method

Universe
In terms of the variable nature of normal active galaxy nuclei (AGN) and luminous quasars, a so-called flux variation gradient (FVG) method has been widely utilized to estimate the underlying non-variable host galaxy fluxes.
Minxuan Cai, Zhen Wan, Zhenyi Cai, Lulu Fan, Junxian Wang   +4 more
doaj   +1 more source

COMPTEL Observations of AGN at MeV-Energies [PDF]

, 1999
The COMPTEL experiment aboard CGRO, exploring the previously unknown sky at MeV-energies, has so far detected 10 Active Galactic Nuclei (AGN): 9 blazars and the radio galaxy Centaurus A. No Seyfert galaxy has been found yet.
Bennett, K., Bloemen, H., Blom, J. J., Collmar, W., Hermsen, W., Lichti, G. G., Ryan, J., Schoenfelder, V., Stacy, J. G., Steinle, H., Williams, O. R., Winkler, C.   +11 more
core   +2 more sources

The nature of obscuration in AGN: II. insights from clustering properties

, 2014
Based on large optical and mid-infrared (IR) surveys, we investigate the relation between nuclear activity in local Seyfert 2 galaxies and galaxy interactions using a statistical neighbour counting technique.
Kauffmann, Guinevere, Li, Cheng, Shao, Li, Wang, Jing   +3 more
core   +1 more source

Dissecting the Power Sources of Low-Luminosity Emission-Line Galaxy Nuclei via Comparison of HST-STIS and Ground-Based Spectra

, 2015
Using a sample of ~100 nearby line-emitting galaxy nuclei, we have built the currently definitive atlas of spectroscopic measurements of H_alpha and neighboring emission lines at subarcsecond scales.
Barth, Aaron J., Castillo, Christopher A., Constantin, Anca, Filippenko, Alexei V., Ho, Luis C., Shields, Joseph C.   +5 more
core   +1 more source

NICMOS Imaging of the Nuclei of Arp 220

, 1998
We report high resolution imaging of the ultraluminous infrared galaxy Arp 220 at 1.1, 1.6, and 2.22 microns with NICMOS on the HST. The diffraction-limited images at 0.1--0.2 arcsecond resolution clearly resolve both nuclei of the merging galaxy system ...
A. S. Evans, B. Stobie, D. Hines, E. Becklin, F. J. Low, G. Schneider, H. Epps, Joseph R. D., M. Rieke, N. Dinshaw, N. Z. Scoville, R. Thompson, Sturm E.   +12 more
core   +1 more source

An infrared study of the double nucleus in NGC3256

, 2007
We present new resolved near and mid-IR imaging and N-band spectroscopy of the two nuclei in the merger system NGCA3256, the most IR luminous galaxy in the nearby universe.
Desert F.-X., Kotilainen J. K., Laurent O., M. Ward, P. Lira, Rigopoulou D., S. Hoyer, Sturm E., V. Gonzalez-Corvalan   +8 more
core   +2 more sources

BASS. XLI. The Correlation between Mid-infrared Emission Lines and Active Galactic Nuclei Emission

The Astrophysical Journal
We analyze Spitzer spectra of 140 active galactic nuclei (AGN) detected in the hard X-rays (14–195 keV) by the Burst Alert Telescope on board Swift.
M. Bierschenk, C. Ricci, M. J. Temple, S. Satyapal, J. Cann, Y. Xie, Y. Diaz, K. Ichikawa, M. J. Koss, F. E. Bauer, A. Rojas, D. Kakkad, A. Tortosa, F. Ricci, R. Mushotzky, T. Kawamuro, K. K. Gupta, B. Trakhtenbrot, C. S. Chang, R. Riffel, K. Oh, F. Harrison, M. Powell, D. Stern, C. M. Urry   +24 more
doaj   +1 more source

Causal Reversal in the M•–σ0 Relation: Implications for High-redshift Supermassive Black Hole Mass Estimates

The Astrophysical Journal
The nascent methodology of applying the principles of causal discovery to astrophysical data has produced affirming results about deeply held theories concerning the causal nature behind the observed coevolution of supermassive black holes (SMBHs) with ...
Benjamin L. Davis, Saakshi More, Zehao Jin, Mario Pasquato, Andrea Valerio Macciò, Feng Yuan   +5 more
doaj   +1 more source