This tag is associated with 51 posts

Bulgeless galaxies with growing black holes

Mergers make bulges in galaxies and black holes generally live in bulges, so mergers must grow black holes – simple. That was until we found bulgeless galaxies containing growing black holes…

AGN Illustration

A New Galactic Yardstick

We can measure the expansion of the universe with velocities and distances of extragalactic objects. But measuring distances is tough! The authors of this paper have developed a new technique for measure the distances of AGN using the “echo” of light from heated dust.

Do major mergers trigger luminous AGN?

Every galaxy is thought to contain a black hole at the centre – but why are some active and some not? What process has ‘switched-on’ these active galaxies? Theorists suggest that major galaxy mergers could play a part for the highly luminous active galaxies but we’re currently lacking conclusive observational evidence to support this theory.

UR #12: Planet-Building Disks and RESOLVE’d AGN

This month’s undergraduate research post features an intriguingly-shaped disk harboring planets, and a study to unmask sneaky, previously-misclassified AGN.

The Changing Faces of Active Galactic Nuclei

Has a multi-wavelength study of AGN across a large redshift range revealed that these energetic giants do not impact upon their host galaxy as significantly as previously thought?

Along for the Ride: Entrainment in Jets

What happens when an astrophysical jet moving at enormous speeds plows into the gas and dust around it? Some of that matter gets dragged along for the ride — and according to this author, this process could create the two different types of jets that we see.

What’s Next For Kepler?

NASA is looking for a new mission for the damaged Kepler space telescope. Here are some ideas.

Going Big with LOFAR

Check out these cool new results from LOFAR which is boldly going to some of the longest wavelengths astronomers have ever observed! An active galaxy has a less active past than we might expect, pulsating neutron stars are behaving strangely, and even at wavelengths as long as meters, there are still spectral lines from extremely low-energy atomic transitions.

Data with models

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.

Active Galactic Nuclei: How to Stop Star Formation

The authors investigate the fraction of massive galaxies at z ~ 2 that contains an Active Galactic Nucleus (AGN), in hopes of understanding the importance of AGN in quenching star formation.

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