scholarly journals COMOVING SPACE DENSITY AND OBSCURED FRACTION OF HIGH-REDSHIFT ACTIVE GALACTIC NUCLEI IN THE SUBARU/XMM-NEWTONDEEP SURVEY

2012 ◽  
Vol 758 (1) ◽  
pp. 49 ◽  
Author(s):  
Kazuo Hiroi ◽  
Yoshihiro Ueda ◽  
Masayuki Akiyama ◽  
Mike G. Watson
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Space Density

scholarly journals Constraints on the production and escape of ionizing radiation from the emission-lines of metal-poor star-forming galaxies

2019 ◽  
Vol 15 (S352) ◽  
pp. 121-122
Author(s):  
A. Plat ◽  
S. Charlot ◽  
G. Bruzual ◽  
A. Feltre ◽  
A. Vidal-Garca ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Emission Line ◽  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Emission Lines ◽  
High Redshift Galaxies ◽  
Star Forming ◽  
Radiative Shocks ◽  
Metal Poor Star

AbstractTo understand how the nature of the ionizing sources and the leakage of ionizing photons in high-redshift galaxies can be constrained from their emission-line spectra, we compare emission-line models of star-forming galaxies including leakage of ionizing radiation, active galactic nuclei (AGN) and radiative shocks, with observations of galaxies at various redshifts with properties expected to approach those of primeval galaxies.

scholarly journals HEAVILY OBSCURED ACTIVE GALACTIC NUCLEI IN HIGH-REDSHIFT LUMINOUS INFRARED GALAXIES

2010 ◽  
Vol 722 (2) ◽  
pp. L238-L243 ◽  
Author(s):  
Ezequiel Treister ◽  
C. Megan Urry ◽  
Kevin Schawinski ◽  
Carolin N. Cardamone ◽  
David B. Sanders
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Infrared Galaxies ◽  
Luminous Infrared Galaxies

SpitzerObservations of Optically “Invisible” Radio and X‐Ray Sources: High‐Redshift Active Galactic Nuclei

2005 ◽  
Vol 626 (1) ◽  
pp. 58-69 ◽  
Author(s):  
J. L. Higdon ◽  
S. J. U. Higdon ◽  
D. W. Weedman ◽  
J. R. Houck ◽  
E. Le Floc’h ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
X Ray

scholarly journals Quasar Evolution and the Growth of Black Holes in the Nuclei of Active Galaxies

1989 ◽  
Vol 134 ◽  
pp. 233-239
Author(s):  
R. D. Blandford
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Radiation Pressure ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Rapid Decrease ◽  
Active Galaxies ◽  
Host Galaxy ◽  
Nearby Galaxies ◽  
The Mean

The observed evolutionary behavior of active galactic nuclei is compatible with a model in which black holes form in the nuclei of new-born galaxies and then grow at a rate limited by both radiation pressure and the supply of gas. Individual sources become more luminous with time as long as they are being fueled. However, the rapid decrease in the mean rate of supply of gas causes a strong decline in the space density of active objects. Nearby galaxies should harbor modest size (∼ 106 – 108 M⊙) black holes. It is suggested that the gas that fuels high redshift quasars is mostly derived from the host galaxy.

scholarly journals Active galactic nuclei-driven outflows without immediate quenching in simulations of high-redshift disc galaxies

2014 ◽  
Vol 441 (2) ◽  
pp. 1615-1627 ◽  
Author(s):  
J. M. Gabor ◽  
Frédéric Bournaud
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Disc Galaxies

scholarly journals High-redshift active galactic nuclei and the next decade of Chandra and XMM-Newton

2017 ◽  
Vol 338 (2-3) ◽  
pp. 241-248 ◽  
Author(s):  
W. N. Brandt ◽  
F. Vito
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei

scholarly journals ASYMMETRIES OF AGN JETS IN INHOMOGENEOUS MEDIA

2014 ◽  
Vol 28 ◽  
pp. 1460192
Author(s):  
VOLKER GAIBLER
Keyword(s):  
Interstellar Medium ◽  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei ◽  
Inhomogeneous Media ◽  
Host Galaxy ◽  
Radio Sources ◽  
Propagation Models ◽  
Hydrodynamical Simulations

Considerable asymmetries in jets from active galactic nuclei (AGN) and associated double radio sources can be caused by an inhomogeneous interstellar medium of the host galaxy. These asymmetries can easily be estimated by 1D propagation models, but hydrodynamical simulations have shown that the actual asymmetries can be considerably larger. With a set of smaller-scale hydrodynamical simulations we examine these asymmetries, and find they are typically a factor of ~ 3 larger than in 1D models. We conclude that, at high redshift, large asymmetries in radio sources are expected in gas-rich galaxies with a clumpy interstellar medium.

scholarly journals On the contribution of active galactic nuclei to the high-redshift metagalactic ionizing background

2017 ◽  
Vol 468 (4) ◽  
pp. 4691-4701 ◽  
Author(s):  
Anson D'Aloisio ◽  
Phoebe R. Upton Sanderbeck ◽  
Matthew McQuinn ◽  
Hy Trac ◽  
Paul R. Shapiro
Keyword(s):  
Active Galactic Nuclei ◽  
High Redshift ◽  
Galactic Nuclei

scholarly journals Cooling and clusters: when is heating needed?

2005 ◽  
Vol 363 (1828) ◽  
pp. 715-724 ◽  
Author(s):  
Greg Bryan ◽  
Mark Voit
Keyword(s):  
Numerical Simulations ◽  
Active Galactic Nuclei ◽  
Flow Problem ◽  
High Redshift ◽  
Cluster Formation ◽  
Galactic Nuclei ◽  
Clusters Of Galaxies ◽  
Cooling Flow ◽  
Current State ◽  
Unknown Source

There are (at least) two unsolved problems concerning the current state of the thermal gas in clusters of galaxies. The first is to identify the source of the heating which offsets cooling in the centres of clusters with short cooling times (the ‘cooling–flow’ problem). The second to understand the mechanism which boosts the entropy in cluster and group gas. Since both of these problems involve an unknown source of heating it is tempting to identify them with the same process, particularly since active galactic nuclei heating is observed to be operating at some level in a sample of well–observed ‘cooling–flow’ clusters. Here we show, using numerical simulations of cluster formation, that much of the gas ending up in clusters cools at high redshift and so the heating is also needed at high redshift, well before the cluster forms. This indicates that the same process operating to solve the cooling–flow problem may not also resolve the cluster–entropy problem.

scholarly journals The hard X-ray luminosity function of high-redshift (3 < z ≲ 5) active galactic nuclei

2014 ◽  
Vol 445 (4) ◽  
pp. 3557-3574 ◽  
Author(s):  
F. Vito ◽  
R. Gilli ◽  
C. Vignali ◽  
A. Comastri ◽  
M. Brusa ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Luminosity Function ◽  
High Redshift ◽  
Galactic Nuclei ◽  
X Ray
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