Quasar's belch solves longstanding mystery
Gemini Observatory observations expose a broad outflow extending in all directions around the galaxy Markarian 231’s core, removing gas from the nucleus at more than twice the rate of star formation.
February 23, 2011
When two galaxies merge to form a giant, the central supermassive black hole in the new galaxy develops an insatiable appetite. However, this ferocious appetite is unsustainable.
Artist’s conceptualization of the environment around the supermassive black hole at the center of Mrk 231. The broad outflow seen in the Gemini data is shown as the fan-shaped wedge at the top of the accretion disk around the black hole. Gemini Observatory/AURA, artwork by Lynette Cook
For the first time, observations with the Gemini Observatory clearly reveal an extreme, large-scale galactic outflow that brings the cosmic dinner to a halt. The outflow is effectively blowing the galaxy apart in a negative feedback loop, depriving the galaxy's monstrous black hole of the gas and dust it needs to sustain its frenetic growth. It also limits the material available for the galaxy to make new generations of stars.
The groundbreaking work is a collaboration between David Rupke from Rhodes College in Tennessee and Sylvain Veilleux from the University of Maryland.
Markarian 231 (Mrk 231), the galaxy observed with Gemini, is an ideal laboratory for studying outflows caused by feedback from supermassive black holes. "This object is arguably the closest and best example that we know of a big galaxy in the final stages of a violent merger and in the process of shedding its cocoon and revealing a very energetic central quasar,” Veilleux said. “This is really a last gasp of this galaxy; the black hole is belching its next meals into oblivion. When we look deep into space and back in time, quasars like this one are seen in large numbers, and all of them may have gone through shedding events like the one we are witnessing in Mrk 231."
Although Mrk 231 is extremely well-studied and known for its collimated jets, the Gemini observations exposed a broad outflow extending in all directions for at least 8,000 light-years around the galaxy's core. The resulting data reveal gas — characterized by sodium, which absorbs yellow light — streaming away from the galaxy center at speeds of over 620 miles (1,000 kilometers) per second. At this speed, the gas could go from New York to Los Angeles in about 4 seconds. This outflow is removing gas from the nucleus at a prodigious rate — more than 2.5 times the star formation rate. The speeds observed eliminate stars as the possible "engine" fueling the outflow. This leaves the black hole itself as the most likely culprit, and it can easily account for the tremendous energy required.
The energy involved is sufficient to sweep away matter from the galaxy. However, "when we say the galaxy is being blown apart, we are only referring to the gas and dust in the galaxy," said Rupke. "The galaxy is mostly stars at this stage in its life, and the outflow has no effect on them. The crucial thing is that the fireworks of new star formation and black hole feeding are coming to an end, most likely as a result of this outflow."
The environment around such a black hole is commonly known as an active galactic nucleus (AGN), and the extreme influx of material into these black holes is the power source for quasistellar objects, or quasars. Merging galaxies help feed the central black hole and also shroud it in gas. Mrk 231 is in transition, now clearing its surroundings. Eventually running out of fuel, the AGN will become extinct. Without gas to form new stars, the host galaxy also starves to death, turning into a collection of old aging stars with few young stars to regenerate the stellar population. Ultimately, these old stars will make the galaxy appear redder, giving these galaxies the moniker "red and dead."
Many physical processes unique to rapidly growing black holes are likely to play a role in propelling the winds observed by Gemini. "At its peak, the quasar shines with such intensity that the light itself is trapped by a cocoon of gas and dust pushing on material with a force that can easily overcome the gravitational pull of the black hole," said Philip Hopkins from the University of California, Berkeley. The bath of X-rays and gamma rays quasars generate could also heat up the gas in the galaxy's center until it reaches a temperature where it "boils over" and causes a bomb-like explosion. "But until now, we haven't been able to catch a system in the act."
Part of the problem, according to Hopkins, has been that the most visible outflows are those collimated jets already known in Mrk 231. These jets are trapped, probably by magnetic fields, in an extremely narrow beam, whereas material is falling into the black hole from all directions. The previously known jets therefore only cause very localized damage — drilling a tiny hole in the cocoon, rather than sweeping it away more broadly as seen in these new, all-encompassing outflows.
The observations for this study were obtained with the Gemini Multi-Object Spectrograph (GMOS) on Gemini North, on Mauna Kea, Hawaii. The study used a powerful technique known as integral field spectroscopy. The integral field unit (IFU) in GMOS obtains a spectrum at several hundred points around the galaxy's core. Each spectrum is then, in turn, used to determine the velocity of the gas at that point and represents the third dimension in what is called a data cube.
Markarian 231 is located about 600 million light-years away in the direction of the constellation Ursa Major. Although its mass is uncertain, some estimates indicate that Mrk 231 has a mass in stars about 3 times that of our Milky Way galaxy, and its central black hole is estimated to have a mass of at least 10 million solar masses or about 3 times that of the supermassive black hole in the Milky Way.
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