scholarly journals Exploring accretion disk physics and black hole growth with regular monitoring of ultrafast active galactic nucleus winds

2017 ◽  
Vol 338 (2-3) ◽  
pp. 249-255 ◽  
Author(s):  
K. Pounds ◽  
A. Lobban ◽  
C. Nixon
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Active Galactic Nucleus ◽  
Regular Monitoring ◽  
Black Hole Growth ◽  
Hole Growth

scholarly journals Forming bulges during galaxy minor mergers

2007 ◽  
Vol 3 (S245) ◽  
pp. 63-66 ◽  
Author(s):  
T. J. Cox ◽  
J. Younger ◽  
L. Hernquist ◽  
P. F. Hopkins
Keyword(s):  
Black Hole ◽  
Large Mass ◽  
Elliptical Galaxies ◽  
Equal Mass ◽  
Mass Ratio ◽  
Black Hole Growth ◽  
Major Merger ◽  
Hole Growth ◽  
Minor Mergers ◽  
Large Mass Ratio

AbstractThe hierarchical formation of structure suggests that dark halos, and the galaxies they host, are shaped by their merging history. While the idea that mergers between galaxies of equal mass, i.e., major merger, produce elliptical galaxies has received considerable attention, he galaxies that result from minor merger, i.e., mergers between galaxies with a large mass ratio, is much less understood. We have performed a large number of numerical simulations of minor mergers, including cooling, star formation, and black hole growth in order to study this process in more detail. This talk will present some preliminary results of this study, and in particular, the morphology and kinematics of minor merger remnants.

scholarly journals The effects of AGN feedback and SPH formulation on black hole growth in galaxies

2016 ◽  
Vol 458 (2) ◽  
pp. 1402-1416 ◽  
Author(s):  
MaoSheng Liu ◽  
Tiziana Di Matteo ◽  
Yu Feng
Keyword(s):  
Black Hole ◽  
Black Hole Growth ◽  
Hole Growth

Radio continuum of galaxies with H2O megamaser disks

2017 ◽  
Vol 13 (S336) ◽  
pp. 139-140
Author(s):  
F. Kamali ◽  
C. Henkel ◽  
A. Brunthaler ◽  
C. M. V. Impellizzeri ◽  
K. M. Menten ◽  
...  
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Active Galactic Nucleus ◽  
Position Angle ◽  
Radio Continuum ◽  
Supermassive Black Hole ◽  
5 Ghz

AbstractIn our attempt to investigate the basic active galactic nucleus (AGN) paradigm requiring a centrally located supermassive black hole (SMBH), a close to Keplerian accretion disk and a jet perpendicular to its plane, we have searched for radio continuum in galaxies with H2O megamasers in their disks. We observed 18 such galaxies with the Very Large Baseline Array in C band (5 GHz, ~2 mas resolution) and we detected 5 galaxies at 8 σ or higher levels. For those sources for which the maser data is available, the positions of masers and those of the 5 GHz radio continuum sources coincide within the uncertainties, and the radio continuum is perpendicular to the maser disk’s orientation within the position angle uncertainties.

scholarly journals Accretion and Outflow in Active Galaxies

2009 ◽  
Vol 5 (S267) ◽  
pp. 273-282
Author(s):  
Andrew King
Keyword(s):  
Black Hole ◽  
Large Scale ◽  
Host Galaxy ◽  
Small Scale ◽  
Gas Flows ◽  
Inverse Compton ◽  
The Galaxy ◽  
Black Hole Growth ◽  
Lower Excitation ◽  
Hole Growth

AbstractI review accretion and outflow in active galactic nuclei. Accreti4on appears to occur in a series of very small-scale, chaotic events, whose gas flows have no correlation with the large-scale structure of the galaxy or with each other. The accreting gas has extremely low specific angular momentum and probably represents only a small fraction of the gas involved in a galaxy merger, which may be the underlying driver.Eddington accretion episodes in AGN must be common in order for the supermassive black holes to grow. I show that they produce winds with velocities v ~ 0.1c and ionization parameters implying the presence of resonance lines of helium-like and hydrogen-like iron. The wind creates a strong cooling shock as it interacts with the interstellar medium of the host galaxy, and this cooling region may be observable in an inverse Compton continuum and lower-excitation emission lines associated with lower velocities. The shell of matter swept up by the shocked wind stalls unless the black hole mass has reached the value Mσ implied by the M–σ relation. Once this mass is reached, further black hole growth is prevented. If the shocked gas did not cool as asserted above, the resulting (“energy-driven”) outflow would imply a far smaller SMBH mass than actually observed. Minor accretion events with small gas fractions can produce galaxy-wide outflows, including fossil outflows in galaxies where there is little current AGN activity.

scholarly journals SUPERMASSIVE BLACK HOLE GROWTH IN STARBURST GALAXIES OVER COSMIC TIME: CONSTRAINTS FROM THE DEEPESTCHANDRAFIELDS

2011 ◽  
Vol 742 (1) ◽  
pp. 3 ◽  
Author(s):  
D. A. Rafferty ◽  
W. N. Brandt ◽  
D. M. Alexander ◽  
Y. Q. Xue ◽  
F. E. Bauer ◽  
...  
Keyword(s):  
Black Hole ◽  
Cosmic Time ◽  
Starburst Galaxies ◽  
Time Constraints ◽  
Supermassive Black Hole ◽  
Black Hole Growth ◽  
Hole Growth

scholarly journals Obscured AGN

2013 ◽  
Vol 9 (S304) ◽  
pp. 43-43
Author(s):  
Amy Barger
Keyword(s):  
Growth Rate ◽  
Black Hole ◽  
Substantial Fraction ◽  
X Ray ◽  
James Clerk Maxwell ◽  
Supermassive Black Hole ◽  
Black Hole Growth ◽  
Deep Fields ◽  
Hole Growth

AbstractObscured AGN may correspond to a substantial fraction of the supermassive black hole growth rate. I will present new surveys with the SCUBA-2 instrument on the James Clerk Maxwell Telescope of the Chandra Deep Fields and discuss whether we can distinguish obscured AGN in hard X-ray and radio selected samples using submillimeter observations.

scholarly journals HOW IMPORTANT IS THE DARK MATTER HALO FOR BLACK HOLE GROWTH?

2011 ◽  
Vol 737 (2) ◽  
pp. 50 ◽  
Author(s):  
Marta Volonteri ◽  
Priyamvada Natarajan ◽  
Kayhan Gültekin
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Dark Matter Halo ◽  
Black Hole Growth ◽  
Hole Growth
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