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black holes
The Spinning Black Hole at the Center of NGC 1365
Previous authors have claimed that the black hole at the center of NGC 1365 is spinning extremely rapidly. But these claims are based on certain assumptions about the dominance of relativistic effects on the spectrum of NGC 1365. Risaliti et al., dig deeper into the spectral data of this X-ray source and use simulations to determine whether the signatures we see are caused by a rapidly-spinning black hole, or just cloudy (galactic) weather.
W49B: A Jet-Driven Supernova?
The authors discuss the possibility that the strangely-shaped supernova remnant W49B was created by a core-collapse supernova that formed strong bipolar jets instead of a spherical shockwave.
Can you hide a super-massive black hole?
Observational surveys looking for the smallest super-massive black holes come up empty; could they be hiding in plain sight?
The Race to Detect Gravitational Waves: Pulsar Timing Arrays
The race to be the first to detect gravitational waves is on – are pulsar timing arrays on the verge of a discovery? New predictions based on revised galaxy merger calculations suggest that it may be so.
The Hole-y Grail: Looking into (near) the singularity
Title: Jet Launching Structure Resolved Near the Supermassive Black Hole in M87 Authors: Sheperd S. Doeleman, Vincent L. Fish, David E. Schenck, Christopher Beaudoin, Ray Blundell, Geoffrey C. Bower, Avery E. Broderick, Richard Chamberlin, Robert Freund, Per Friberg, Mark A. Gurwell, Paul T. P. Ho, Mareki Honma, Makoto Inoue, Thomas P. Krichbaum, James Lamb, Abraham [...]
The Serendipitous Discovery of Two Stellar Mass Black Holes in the Globular Cluster M22
In this article, the authors report their serendipitous discovery of two stellar mass-black holes in the globular cluster M22, however theoretical work predicts that there should only be one stellar-mass black hole!
Sgr A*: A flickering black hole
Witzel et. al examine the statistical properties of the photometric variability of our Galaxy’s central black hole.
Massive and Passive Galaxies due to Early Quasar Driven Outflows
In the nearby Universe, massive galaxies contain very little interstellar gas and old stellar populations. But theoretical models predict that such galaxies should have much younger stellar populations. In order to solve this discrepancy models invoke quasar outflows in the early Universe. Such outflows would expel the gas from a galaxy and quench star formation. Presented here are the results from the first massive quasar outflow observer at z ~ 6.4189.
Does AGN feedback trigger star formation?
Active galactic nuclei are some of the most luminous objects in the universe. This paper explores how feedback from AGN could trigger star formation in their host galaxies.
To be or not to be: central black holes in small stellar systems
Miller & Davies investigate whether central black holes should exist in low mass stellar systems such as globular clusters.
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