This tag is associated with 55 posts

The age of cross-correlations

When two observations share some common information, they can be “cross-correlated” to extract it. In today’s example, we discover what the matter halos and energetic phenomena in the Universe have in common through a cross-correlation.

MUSEing on positive feedback

Direct observational evidence for positive feedback from the interaction of outbursts from active black holes and the surrounding medium has been lacking so far, until now…

Bending Under Pressure: Bent Jets in Galaxy Clusters

The diffuse gas contained within galaxy clusters can dramatically affect the galaxies moving within it. This includes bending the jets coming out of active galactic nuclei in galaxy clusters. The authors in today’s Astrobite report on extremely bent jets recently discovered in galaxy NGC 1272.

A new method for cosmic distances: using active galactic nuclei

Time delays in the light from AGNs’ dusty torii can tell us the intrinsic luminosity and hence the distance to the AGN.

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.

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