Listen: Discovery Of Cold Quasars Sheds Light On How Galaxies Die
"Astronomers have written a new chapter in how galaxies die. Researchers have reported the discovery of what they call in code quasars, these galaxies featuring abundance of code gas that can still produce. New stars despite having an active supermassive black hole, quasar, they centers the breakthrough announced the two hundred thirty fourth meeting of the American economical society, some Louis overturns assumptions about how galaxies mature and may represent a new until now unknown phase in galaxies life cycle, Cuevas a powerful beams of energy and matter, generated by supermassive black holes millions to billions of times, the massive out son material falling onto an accretion disc surrounding these months. The black holes is crushed and torn pilots collides with other material on the disc almost of this material is destined to eventually pass a point of no return called the veteran and then full forever into the black hole singularity some of this behavior material is instead caught up in magnetic fields before reaching the veteran. It's an enchanted into powerful beams jetting out, perpendicular to the accretion disc at close to the speed of light, shiny is incredibly bright beacons visible across the universe quasars are usually any found meeting from supermassive black holes in galaxies in the early end of this, when they still had plenty of material fate upon and once the meta surrounding the supermassive black hole is consumed. The Cueva becomes inactive, the study's lead, author, assistant professor Alison cook, Patrick from the university of Kansas says Cuevas have long been thought to signal the end of the galaxies ability to produce new stars. She says all the gas creating into the black hole. He's being hated giving. Fix raise cook Patrick ports at the wavelength of light that an object gives off directly corresponds to how hot it is. For example, humans give most of their light infrared that something that's giving off xrays must be one of the hottest things the universe this guest, that's creating under the black hole and begins moving at relativistic speeds magnetic fields are also generated in the gas, and then get all twisted up. In the same way, you have Seoul of Liz, blasting out from the sun, you can also have Jetson material going through these magnetic field lines on black holes. And then blasting out into space these jets essentially choke off the guests supply of the galaxy. And with no more guests for under the galaxy. It can't form. You stars after galaxy stop forming you stars. Astronomers describe it as a dead galaxy. But cook Patrick surveys found that about ten percent of galaxies hosting at creating supermassive black holes also had a supply of coal gas remaining after entering this phase and was still making you stars. She says these included all different types of galaxies some had obvious. Mergers signatures, others. Look more pristine like the Milky Way with this thing spiral arms and still others were very compact. From this diverse population has found a further ten percent that were really unique and totally unexpected. They were all very compact blue in the sources. In fact, they looked exactly like what a supermassive black hole would look like at the end stages of its existence after its quenched. The staff were mation into galaxy these objects, clearly evolve into passive, elliptical galaxies yet, kept Patrick and colleagues fan, lots of cold gas in them as well. Hence the name co quasars the author suspect called quasars represent a brief yet to be recognized period in the phases of galaxies live span the galaxies array, because they were in a transition phase right before star formation, the galaxies, quenched, cook, Patrick, and colleagues identified, they called Cuevas in data from a region of the Sloan digital sky survey, the most detailed digital map of the universe available. They then examine this region and stripe eighty two using the X men, mutant x Ray space telescope and with the Herschel fi, infrared space telescope, looking fit Dustin guests in the host galaxy scientists already know that quasars go through a heavily shrouded dust, obscure phase, where does the surrounding the supermassive black hole in what they call a red quasar phase. But this unique transition showed luminous quasars had a blue optical color. Let's still with lots of dust and gas and that simply not what they should look alike. Cook Patrick thought the growing black hole, which is in trout, industrial gas, simply began blowing material away becoming a luminous blue object. It was assumed that once the black hole of blown out old sewn guests it would blow out gas from the rest of the galaxy as well. But it seems that's not the case. They haven't yet blown out all the dust and guests in the host galaxies. And this called Cueva transition phase could last another ten million years. Knicks Patrick wants to determine if this code quasar phase happens in all galaxies or whether it's just specific to particular type of galaxy. This is space time. I'm Stewart Gary."