scholarly journals Corrigenda: Populating the Galaxy Velocity Dispersion – Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values

2008 ◽  
Vol 25 (4) ◽  
pp. e1-e1
Author(s):  
Alister W. Graham
Keyword(s):  
Black Hole ◽  
Velocity Dispersion ◽  
Black Hole Mass ◽  
Supermassive Black Hole ◽  
The Galaxy

scholarly journals Populating the Galaxy Velocity Dispersion: Supermassive Black Hole Mass Diagram, A Catalogue of (Mbh, σ) Values

2008 ◽  
Vol 25 (4) ◽  
pp. 167-175 ◽  
Author(s):  
Alister W. Graham
Keyword(s):  
Black Hole ◽  
Globular Clusters ◽  
Velocity Dispersion ◽  
Black Hole Mass ◽  
Data Set ◽  
Stellar Cluster ◽  
Barred Galaxies ◽  
Reverberation Mapping ◽  
Supermassive Black Hole ◽  
The Galaxy

AbstractAn updated catalogue of 76 galaxies, with direct measurements of supermassive black-hole mass (Mbh) plus, when available, the central velocity dispersion (σ0) of their host bulge is provided. Fifty of these mass measurements are considered reliable, while the others remain somewhat uncertain at this time. An additional nine stellar systems, including one stellar cluster and three globular clusters, are listed as hosting potential intermediate mass black holes <106M⊙.With this larger data set, the demographics within the Mbh–σ0 diagram are briefly explored. Many barred galaxies are shown to be offset from the Mbh–σ0 relation defined by the non-barred galaxies, in the sense that their velocity dispersions are too high. Furthermore, including 88 AGN with black-hole mass estimates from reverberation mapping studies, we speculate that barred AGN may follow this same general trend. We also show that some AGN with σ0 < 100 km s−1 tend to reside up to (∼0.6 dex) ∼1.0 dex above the (barless) Mbh–σ0 relation. Finally, it is shown that ‘core galaxies’ appear not to define an additional subdivision of the Mbh–σ0 diagram, although improved methods for measuring σ0 values may be valuable.

scholarly journals Universal interferometric signatures of a black hole’s photon ring

2020 ◽  
Vol 6 (12) ◽  
pp. eaaz1310 ◽  
Author(s):  
Michael D. Johnson ◽  
Alexandru Lupsasca ◽  
Andrew Strominger ◽  
George N. Wong ◽  
Shahar Hadar ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Event Horizon ◽  
Infinite Sequence ◽  
High Order ◽  
Black Hole Mass ◽  
Tests Of General Relativity ◽  
Supermassive Black Hole ◽  
The Galaxy ◽  
Self Similar

The Event Horizon Telescope image of the supermassive black hole in the galaxy M87 is dominated by a bright, unresolved ring. General relativity predicts that embedded within this image lies a thin “photon ring,” which is composed of an infinite sequence of self-similar subrings that are indexed by the number of photon orbits around the black hole. The subrings approach the edge of the black hole “shadow,” becoming exponentially narrower but weaker with increasing orbit number, with seemingly negligible contributions from high-order subrings. Here, we show that these subrings produce strong and universal signatures on long interferometric baselines. These signatures offer the possibility of precise measurements of black hole mass and spin, as well as tests of general relativity, using only a sparse interferometric array.

scholarly journals The Megamaser Cosmology Project: precise black hole mass measurement and the implication for the MBH–σ∗ relation

2014 ◽  
Vol 10 (S312) ◽  
pp. 56-60
Author(s):  
Cheng-Yu Kuo ◽  
James A. Braatz ◽  
James J. Condon ◽  
Caterina M. V. Impellizzeri ◽  
Kwok-Yung Lo ◽  
...  
Keyword(s):  
Black Hole ◽  
Velocity Dispersion ◽  
Mass Measurement ◽  
Black Hole Mass ◽  
Mass Measurements ◽  
The North ◽  
Accuracy And Precision ◽  
The Galaxy ◽  
Stellar Velocity ◽  
Tight Correlation

AbstractWe made dynamical black hole mass measurements from nineteen Seyfert 2 galaxies which host sub-parsec H2O maser disks using the H2O megamaser technique. The nearly perfect Keplerian rotation curves in many of these maser systems guarantee the high accuracy and precision of the black hole mass measurements. With the stellar velocity dispersion (σ∗) of the galaxy bulges measured with the Dupont 2.5 m telescope at Las Campanas Observatory in the South and the Apache Point Observatory (APO) 3.5m telescope in the North, we found that H2O maser galaxies, most of which host pseudo bulges rather than classical bulges, do not all follow the MBH–σ∗ relation shown in the literature. This result is well consistent with the latest findings by Kormendy & Ho (2013) that only early type galaxies and galaxies with classical bulges follow a tight MBH–σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.

scholarly journals The Dark Matter Halo Density Profile, Spiral Arm Morphology, and Supermassive Black Hole Mass of M33

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Marc S. Seigar
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Density Profile ◽  
Pitch Angle ◽  
Rotation Curve ◽  
Dark Matter Halo ◽  
Black Hole Mass ◽  
Supermassive Black Hole ◽  
Virial Mass ◽  
Spiral Arm

We investigate the dark matter halo density profile of M33. We find that the HI rotation curve of M33 is best described by an NFW dark matter halo density profile model, with a halo concentration of and a virial mass of . We go on to use the NFW concentration of M33, along with the values derived for other galaxies (as found in the literature), to show that correlates with both spiral arm pitch angle and supermassive black hole mass.

scholarly journals Supermassive black hole mass regulated by host galaxy morphology

2009 ◽  
Vol 400 (4) ◽  
pp. 1803-1807 ◽  
Author(s):  
Y. Watabe ◽  
N. Kawakatu ◽  
M. Imanishi ◽  
T. T. Takeuchi
Keyword(s):  
Black Hole ◽  
Host Galaxy ◽  
Black Hole Mass ◽  
Supermassive Black Hole ◽  
Galaxy Morphology

scholarly journals A strong magnetic field around the supermassive black hole at the centre of the Galaxy

Nature ◽  
2013 ◽  
Vol 501 (7467) ◽  
pp. 391-394 ◽  
Author(s):  
R. P. Eatough ◽  
H. Falcke ◽  
R. Karuppusamy ◽  
K. J. Lee ◽  
D. J. Champion ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Strong Magnetic Field ◽  
Supermassive Black Hole ◽  
The Galaxy

scholarly journals The Slope of the Black Hole Mass versus Velocity Dispersion Correlation

2002 ◽  
Vol 574 (2) ◽  
pp. 740-753 ◽  
Author(s):  
Scott Tremaine ◽  
Karl Gebhardt ◽  
Ralf Bender ◽  
Gary Bower ◽  
Alan Dressler ◽  
...  
Keyword(s):  
Black Hole ◽  
Velocity Dispersion ◽  
Black Hole Mass
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