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In February 2016, Japan launched a pioneeringblack-hole-monitoring satellite but after the successful launch they lost its control under strange circumstances. Now, we can finally witness what Hitomi saw right before it went offline. When Hitomi went offline, researchers were successful in gathering some data from Hitomi, which was published in Nature, which displays Hitomi’s last observation. It has some interesting implications for what we currently know about the role of black holes in galaxy formation.

Hitomi’s last observations (Image Credit: Hitomi Collaboration/JAXA, NASA, ESA, SRON and CSA)

Hitomi’s last observations were of the Perseus Cluster, a massive galaxy cluster 240 million light years containing a supermassive black hole at its center. Hitomi was able to capture this amazing view of the galaxy (shown above), as well as to extent its x-ray activity. Researchers were expecting to observe teeming activity in the center of the cluster, but Hitomi’s last x-ray observations displayed very little action.

Co-author of this new research paper, Andrew Fabian of Cambridge University told Gizmodo that, “The intracluster gas is quieter than expected. We expected that the level would be higher based on the activity of the central galaxy.” But this result is not just an astonishing refuge of calm in a stormy galaxy. It also provides us insight into just what role black holes play in how galaxies do or don’t form.
“The surprise is that it turns out that the energy being pumped out of the black hole is being very efficiently absorbed,” co-author Brian McNamara of the University of Waterloo told Gizmodo. “This hot gas that we’re looking at with Hitomi is the stuff of the future, it’s the gas out of which galaxies form. 

There is much more of this hot gas than there are stars in the galaxy, or there’s more stuff that was not made into galaxies than that was.” That means that nearby black holes play a big role in the eventual size of a galaxy. “What it shows is that black holes very effectively control the growth rate of galaxies,” said McNamara.

Of course, the finding underscores how little we still know about the role of black holes in galaxy formation. It also gives us a tantalizing look at how much promise the satellite held before it was lost. The loss is even bigger because Hitomi marked what researchers hoped would be the end of a long-standing struggle to finally stick an x-ray micro calorimeter a device used to take incredibly precise measurements of the energy in x-rays into space. 

The findings in today’s study were based on just a very small sample of data researchers were able to get from Hitomi’s micro calorimeter before it was lost, and it already has them speculating over what could have been.

“The measurements on the Perseus Cluster showed the potential of the Hitomi x-ray micro calorimeter to transform our understanding of the velocities of hot gas throughout the Universe,” Fabian said. Before Hitomi, there were two other attempts to send a micro calorimeter into space and both ended in strange accidents. 

In 2000, a rocket mission that would have sent the first micro calorimeter into space exploded upon launch. In 2005, a micro calorimeter actually made it into space, but was destroyed by a coolant leak. It was not until 2016 with Hitomi that a micro calorimeter was successfully launched long enough to take measurements only to be lost along with the entire satellite shortly after.

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