Sentences with phrase «active black holes»

In these galaxies, stars continue to develop along the jets of active black holes, albeit at a moderate rate.

That grim scenario has become more likely based on a new survey of galaxies hosting active black holes at their centers.

As galaxies with active black holes in their cores provide a means of observing huge quantities of radiation being generated and its impact on galaxies, AGN have been used as a laboratory to study star formation in these tumultuous places.

There are other possible sources for the particles — for one, IceCube has already traced an especially high - energy neutrino to a single active black hole that may not be in a cluster (SN Online: 4/7/16).

A trio of mysterious high - energy particles could all have the same source: active black holes embedded in galaxy clusters, researchers suggest January 22 in Nature Physics.

NASA's Hubble Space Telescope's exquisite high resolution and ultraviolet - light sensitivity allowed the astronomers to see brilliant knots of hot, blue stars forming along the jets of active black holes found in the centers of giant elliptical galaxies.

To get a better picture of the gamma - ray environment, Douglas Finkbeiner of the Harvard — Smithsonian Center for Astrophysics and his colleagues carefully subtracted those sources based on maps showing locations of cosmic dust, models of the galactic disk, and known emitters of gamma rays, such as active black holes in other galaxies.

In other words, according to Morris's theory, a temporarily active black hole would help create stars, and the stars would repay the favor by sending the black hole new dust before explosively burning themselves out.

Her dissertation work focused on studying and modeling the extremely energetic outflows from active black holes at galactic centers.

Maunakea, Hawaii — Using the W. M. Keck Observatory in Hawaii, a group of astronomers led by Joseph Hennawi of the Max Planck Institute for Astronomy have discovered the first quadruple quasar: four rare active black holes situated in close proximity to one another.

The problem, of course, stems from the fact that with the exception of active black holes — which are surrounded with a bright accretion disk — it is kind of hard to hunt down objects that do not allow even light to escape their gravitational pull.

This may explain why jellyfish galaxies seem more likely than other types of galaxies to have active black holes at their centres.

But Alastair Edge at Durham University, UK, isn't convinced there are active black holes in the galaxies examined.

«This gives us new insights into how a black hole can regulate future star birth and how a galaxy can acquire additional material to fuel an active black hole.»

Annuar's study of the spiral galaxy NGC 1448 discovered that X-ray emission from NGC 1448, as seen by NuSTAR and NASA's Chandra X-Ray Observatory, suggests for the first time that, like IC 3639, there must be a thick layer of gas and dust hiding the active black hole in this galaxy from our line of sight.

Astronomer Fabrizio Nicastro of the Harvard - Smithsonian Center for Astrophysics in Cambridge, Massachusetts, and his colleagues monitored the galaxy Markarian 421, which contains a «blazar» — an active black hole that aims powerful jets of energy toward Earth.

«It's an interesting conclusion, but an ambiguous one,» he says, warning that what looks like an active black hole may actually be the traces of a collision between two gas clouds.

One in 10 of these active black holes also produces jets that fire out particles at 99.995 % of the speed of light.

Imagine, he says, that our center was a Seyfert - like galaxy with an active black hole, fed by a surrounding disk of dust, that seeded the violent creation of several nests of big, hot stars.

«This strong link between ram pressure stripping and active black holes was not predicted and has never been reported before,» said team leader Bianca Poggianti from the INAF - Astronomical Observatory of Padova in Italy.