New Evidence That Supermassive Black Holes Eventually Suck the Life out of Big Galaxies



New Evidence That Supermassive Black Holes Eventually Suck the Life out of Big Galaxies

The Centaurus A galaxy, showing the characteristic jets of gas thrown off by a supermassive black hole. (Image: ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray))

At the core of each large galaxy lies a supermassive black hole with the mass of 1 million suns. New research shows that these celestial vacuum cleaners do more than just devour nearby objects—they also grow to a size that eventually suppresses a galaxy’s ability to churn out new stars, effectively rendering them sterile.

Young galaxies are absolutely bursting with bright, newly formed stars. As time passes, however, star formation eventually grinds to a halt. A new study published in Nature shows that supermassive black holes play a critical role in determining when large galaxies stop producing new stars, a process known as “quenching.”

Stars form out of cold gas, so when a galaxy runs out of cold gas it’s effectively quenched. One possible way this could happen—at least for galaxies with supermassive black holes—is that the gas that pours onto a supermassive black hole triggers the production of high-energy jets. The energy released by these jets can expel cold gas out of the galaxy, causing star formation to shut down.

At least that’s the theory. This idea has been around for quite some time, but no observational evidence existed to support the alleged correlation between supermassive black holes and star formation. The new study, led by Ignacio Martín-Navarro from the University of California Santa Cruz, now fills this gap in our knowledge.

Using data collected by the Hobby-Eberly Telescope Massive Galaxy Survey, Martín-Navarro’s team analyzed the spectra of light coming from distant galaxies. This allowed them to separate and measure the varying wavelengths of light coming from these distant objects. The scientists used this data to create a historical snapshot of a galaxy’s star formation history. They then compared this history with black holes of different masses, which resulted in some striking differences—differences that correlated with black hole mass, but not the shape, size, or other properties of black holes.

“The subsequent quenching of star formation takes place earlier and more efficiently in galaxies that host higher-mass central black holes,” wrote the researchers. “The observed relation between black-hole mass and star formation efficiency applies to all generations of stars formed throughout the life of a galaxy, revealing a continuous interplay between black-hole activity and… cooling.”

As Martín-Navarro clarified in an accompanying statement, for galaxies with the same mass of stars, but with a different black hole mass in the center, “those galaxies with bigger black holes were quenched earlier and faster than those with smaller black holes.” This means that star formation will last longer in galaxies with smaller central black holes. “[…Accretion onto more massive black holes leads to more energetic feedback from active galactic nuclei, which would quench star formation faster,” he said.

It’s an exciting result, but there’s still lots of work to do. While the researchers managed to produce observational evidence showing that black hole mass can be connected to the quenching of star formation, they’re still unclear about the exact mechanical processes involved. As study co-author Aaron Romanowsky explained, “There are different ways a black hole can put energy out into the galaxy, and theorists have all kinds of ideas about how quenching happens, but there’s more work to be done to fit these new observations into the models.”

Our galaxy, the Milky Way, features its own super massive black hole and is not immune to this process. It is currently transitioning from star-forming mode to a passive, sterile existence. Eventually, a few billion years from now, all the stars in the Milky Way will be extinguished, and the super massive black hole at center will evaporate into nothing. It’s a grim prospect, but such is the way of the indifferent cosmos.

Oddball Object Tumbling among the Stars Could Disrupt Planetary Science



Oddball Object Tumbling among the Stars Could Disrupt Planetary Science

The solar system’s first-observed interstellar emissary hints at undiscovered populations of exoplanets and violent origins

Oddball Object Tumbling among the Stars Could Disrupt Planetary Science
The interstellar object ‘Oumuamua is marked with a blue circle near the center of this picture, which was created using multiple images from the Gemini South Telescope and the Very Large Telescope. Credit: ESO/K. Meech et al

Our solar system’s first-known visitor from another star, the recently discovered object called ‘Oumuamua, could be a bonanza for researchers. With only a brief window of time to observe the cigar-shaped wanderer before it zooms beyond the reach of our best telescopes, astronomers have crammed in observations with the hopes of learning more about this interstellar interloper. Not only is the fast-moving object intriguing in its own right; it may also provide insights about how planetary systems evolve.

‘Oumuamua caught the eyes of astronomers on October 19 this year. Calculations revealed the space rock was traveling at 26 kilometers per second relative to the sun, a rapid clip that along with its extremely elongated orbital trajectory suggested it came from outside the solar system. Telescopes swiftly targeted the object, with most researchers expecting to see a cometary tail trailing from an icy visitor as it approached the sun. But to their surprise, ‘Oumuamua showed none. Instead, it looked more like an asteroid. “It does not a resemble a comet—it had no tail whatsoever,” says Karen Meech, who studies comets at the University of Hawai’i at Mnoa. Meech used NASA’s Hubble Space Telescope and other observatories to examine the mysteriously inert space tourist.

Asteroid or comet—why does it matter? The answer ties into our understanding of how planetary systems grow over time in their natal “protoplanetary” disks around young stars. Newborn giant planets can jostle one another, using their gravity to push each other around. They also lord their size over their smaller neighboring worlds—and especially over the kilometer-scale objects called “planetesimals” left behind as debris from the planet-forming process. When a giant planet throws its weight around, more than half of these planetesimals can wind up hurled from the system. Because most of a typical protoplanetary disk is icy—in 2016 Meech used solar system observations to estimate there were as many as 10,000 icy objects for every rocky object—icy objects should dominate the ejecta.

Location also makes a difference in what gets thrown out. Most gas giants lie on the other side of the “snow line,” a demarcation in a protoplanetary disk where its composition shifts from mostly rock to mostly ice. Objects on the star side are baked dry by starlight and thus predominantly rocky whereas objects on the darker outer side are colder and tend to retain more ice. In our solar system the snow line lies between the orbits of Mars and Jupiter, and astronomers believe that distance is roughly where it started out for other sunlike stars. As outlying gas giants shift their orbits, they become more likely to interact with nearby ices than the more distant rocky material closer-in to the star, adding fuel to the idea that most of the interstellar visitors we observe should be icy—including ‘Oumuamua.

“The population of planetesimals floating in space should be dominated by comets, not by asteroids,” says Sean Raymond, an astronomer at the Laboratory of Astrophysics of Bordeaux in France who models the early solar system. In a recent paper Raymond argues the extrasolar visitor is more like a defunct comet than an asteroid, based on how the exoplanets we’ve observed so far are laid out. “It’s kind of weird that this object ‘Oumuamua doesn’t have any signs of activity.”

‘Oumuamua’s oddball spin could be related to its origins as well. According to new research posted on the preprint server, the visitor is tumbling willy-nilly rather than smoothly rotating on its axis. The researchers, who declined to comment due to embargo concerns, state in their paper “1I/‘Oumuamua was likely set tumbling within its parent planetary system, and will remain tumbling well after it has left ours.” ‘Oumuamua’s motion, they speculate, could be due to a long-ago collision with another body or the extreme tidal torqueing it may have experienced during its ejection from its parent planetary system. Alternatively, its spin could come from the jetlike outgassing of icy material vaporizing in sunlight—the process that creates a cometary tail.

But, again, the object did not appear to sprout a tail when it closely approached our sun. If indeed ‘Oumuamua is an icy body, how did it avoid growing a cometary tail? David Jewitt, an astronomer at the University of California, Los Angles, suspects any ice might be buried under a layer of material damaged by the charged particles known as cosmic rays that bombarded ‘Oumuamua while it traveled through space. “The prolonged exposure will toast the surface,” forming a protective crust, he says.

A crust of only half a meter could be enough to shield the ice, Jewitt adds. He calculated how heat could have moved through the object, using solar system analogues because its surface composition is unknown, and found it would not make it very far. “You’d only have to go a meter or two into the surface,” he says, “to reach the ‘interstellar temperature,’”—which is only a few degrees above absolute zero.

Not everyone thinks ‘Oumuamua could be a crusty comet. “I would not expect that volatiles would be sealed up in any particular way,” Meech notes. David Trilling, who studies asteroids at Northern Arizona University, says that although it is possible to strongly irradiate primitive material in the solar system, “it’s not obvious that you can get that irradiated goop on an interstellar object.”

Unfortunately, we are unlikely to ever know what materials comprise ‘Oumuamua because it is moving far too fast on its way out of the solar system for us to have a realistic chance of catching up to it with even our speediest spacecraft. But it left astronomers excited about the next one; they anticipate spotting about one interstellar visitor a year in the near future. If those objects all wind up being rocky, that could mean bad news for our understanding of planet formation. “If the first 10 [objects] were all rocky, then it would mean we’re really off on something important,” Raymond says. Most likely, it would mean the rocky material makes up a far larger portion of the natal disks than expected by the models. “We’d have to be way off on where planetesimals form,” he says.

In a separate paper U.C. Santa Cruz astrophysicist Greg Laughlin estimates that an abundance of rocky interstellar voyagers would require about 200 Earth-masses of debris to be ejected from every planet-hosting star, rather than the 10 Earth-masses current models call for. “It just doesn’t really work,” he says. “It’s just a little too much to ask for.”

If ‘Oumuamua is icy, Laughlin thinks it has important implications for Neptune-size worlds in the outer reaches of other planetary systems, which have been a challenge to observe. Because distant Jupiter-size worlds are only found around roughly one out of every 10 stars, he thinks the ejection of ‘Oumuamua-like objects might need a boost from an as-yet-undiscovered population of icy Neptune-like worlds in Jupiter-free systems.

For now, scientists are waiting for the more tourists from other solar systems to visit—hopefully streaming long tails behind them. “It’s not hopeless,” Jewitt says. “We just have to wait for the next 10 or so to be discovered. If none look like a comet, that would be interesting. It would tell us a little more than just seeing one object.”

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(Philosophy Poem) Praise



We praise who we are, not whom we really ought to be

Are we really pleased with the view of the selfie we see

So vain, or, is it just honesty, true vanity we dare praise

What we love most is to what we bow our knees, we worship

A beautiful bum, bigger breasts or a Silver Shadow in our stars

What we praise is what we be, who we really are the world see’s



Put something before oneself, you are an odd fellow I see

On a DC-10 you gonna hitch a ride to the next rock barge

Clone us, but when dead don’t donate any of our rotting parts

Why should I care when gone if others suffers, live or die

So many a star, self-proclaimed as most are rotting while alive

Through personal praise and ego, we all know we are a star



To Whom or to what do we ever bow our knee or head to pray

We think we’re so cool, one heart beat from Hell’s fiery flame

Waking up with fire singeing, our short hairs all burnt away

To whom is it now that we do wish we could sing and pray



Hearts get in touch with your senses, your Soul and your brain

Humanity, decide wisely if you wish to avoid the Devil’s pain

Humans, be careful what you pray, for reality bites like an Asp

Actions prove who owns our Soul, and our destination once we go


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