Corpus ID: 18620735

QSO Lifetimes

@inproceedings{Martini2003QSOL,
  title={QSO Lifetimes},
  author={Paul Martini},
  year={2003}
}
The QSO lifetimetQ is one of the most fundamental quantities for understanding black hole and QSO evolution, yet it remains uncertain by several order s of magnitude. IftQ is long, then only a small fraction of galaxies went through a luminou s QSO phase. In contrast, a short lifetime would require most galaxies today to have und ergone a QSO phase in their youth. The current best estimates or constraints on tQ from black hole demographics and the radiative properties of QSOs vary from at least… Expand

Figures and Tables from this paper

The Almighty Quasar — Destroyer of Worlds
In the study of habitability of terrestrial exoplanets, both life-supporting conditions and the prevalence of transient life-threatening events need to be considered. One type of hazardous effectExpand
Studying the epoch of hydrogen reionisation in redshifted 21-cm radiation
The measurement of the spatial distribution of neutral hydrogen in the high-redshift intergalactic medium, through its 21-cm hyperfine transition, will revolutionise our understanding of the periodExpand
A SIMPLE MODEL FOR QUASAR DEMOGRAPHICS
We present a simple model for the relationship between quasars, galaxies, and dark matter halos from 0.5 < z < 6. In the model, black hole (BH) mass is linearly related to galaxy mass, and galaxiesExpand
Young stellar populations in type II quasars: timing the onset of star formation and nuclear activity
Despite the emerging morphological evidence that luminous quasar-like active galactic nuclei (AGN) are triggered in galaxy mergers, the natures of the triggering mergers and the order of events inExpand
LIGO tells us LINERs are not optically thick RIAFs
Low ionization nuclear emission-line regions (LINERs) are a heterogeneous collection of up to one-third of galactic nuclei in the local Universe. It is unclear whether LINERs are simply the resultExpand
A large neutral fraction of cosmic hydrogen a billion years after the Big Bang
TLDR
It is shown that the IGM surrounding these quasars had a neutral hydrogen fraction of tens of per cent before the quasar activity started, much higher than the previous lower limits of ∼0.1 per cent, suggesting the presence of a second peak in the mean ionization history of the Universe. Expand
On merger bias and the clustering of quasars
We use the large catalogues of haloes available for the Millennium Simulation to test whether recently merged haloes exhibit stronger large-scale clustering than other haloes of the same mass. ThisExpand
The Formation of the First Massive Black Holes
Supermassive black holes (SMBHs) are common in local galactic nuclei, and SMBHs as massive as several billion solar masses already exist at redshift z=6. These earliest SMBHs may grow by theExpand
Redshift and Energy Conservation
It has always been considered a serious error to treat the cosmological redshift as a Doppler velocity effect rather than the result of space expansion. It is demonstrated here that in practicalExpand
Subsurface exolife
Abstract We study the prospects for life on planets with subsurface oceans, and find that a wide range of planets can exist in diverse habitats with ice envelopes of moderate thickness. We quantifyExpand
...
1
2
...

References

SHOWING 1-3 OF 3 REFERENCES
The Carnegie Observatories Astrophysics Series
On the occasion of the Centennial of the Carnegie Institution of Washington, Carnegie Observatories held a series of four astrophysics symposia in Pasadena from October 2002 to February 2003. TheExpand
Sov. Phys. Dokl
  • Sov. Phys. Dokl
  • 1964