Heralding the growth of monster black holes pulling in surrounding material while belching out the cosmic x-ray background
Space news (astrophysics: x-ray bursts; detecting high-energy x-rays emitted by supermassive black holes) – searching the COSMOS field for elusive, high-energy x-rays with a high-pitched voice –
Astronomers searching for elusive, high-energy x-rays emitted by supermassive black holes recently made a discovery using NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR). A chorus of high-energy x-rays emitted by millions of supermassive black holes hidden within the cores of galaxies spread across a field of galaxies called the COSMOS field. Singing the elusive, high-pitched song of a phenomenon scientists call the cosmic x-ray background they emitted when they pulled surrounding matter closer. A significant step in resolving the high-energy x-ray background and understanding more about the feeding habits of supermassive black holes as they grow and evolve.
“We’ve gone from resolving just two percent of the high-energy X-ray background to 35 percent,” said Fiona Harrison, the principal investigator of NuSTAR at Caltech in Pasadena and lead author of a new study describing the findings in an upcoming issue of The Astrophysical Journal. “We can see the most obscured black holes, hidden in thick gas and dust.”
The Monster of the Milky Way, the supermassive black hole believed to reside at the core of our galaxy, bulked up by siphoning off surrounding gas and dust in the past and will continue to grow. The data obtained here by NASA’s NuSTAR will help scientists learn more concerning the growth and evolution of black holes and our host galaxy. It will also give astrophysicists more insight into the processes involved the next time the Monster of the Milky Way wakes up and decides to have a little snack.
“Before NuSTAR, the X-ray background in high energies was just one blur with no resolved sources,” said Harrison. “To untangle what’s going on, you have to pinpoint and count up the individual sources of the X-rays.”
NASA’s NuSTAR’s the first telescope capable of focusing high-energy x-rays into a sharp image, but it only gives us part of the picture. Additional research’s required to clear up the picture a little more and give us a better view of the real singers in the choir. NuSTAR should allow astronomers to decipher individual voices of x-ray singers in one of the cosmos’ rowdiest choirs.
“We knew this cosmic choir had a strong high-pitched component, but we still don’t know if it comes from a lot of smaller, quiet singers, or a few with loud voices,” said co-author Daniel Stern, the project scientist for NuSTAR at NASA’s Jet Propulsion Laboratory in Pasadena, California. “Now, thanks to NuSTAR, we’re gaining a better understanding of the black holes and starting to address these questions.”
Astronomers plan on collecting more data on the high-energy x-ray choir of the COSMOS field, which should help clear up a few mysteries surrounding the birth, growth, and evolution of black holes. Hopefully, it gives also gives us more clues to many of the mysteries we discover during the human journey to the beginning of space and time.
Can blow star-forming gas 1000 light-years out of core region of host galaxies
Space news (astrophysics: evolution of galaxies; feedback mechanisms) – about 2.3 billion years ago in a galaxy far, far away and standing in a fierce, 2 million mile per hour (3 million kilometers per hour) outflow of star-forming gas –
Astrophysicists studying the evolution of galaxies using the Suzaku X-ray satellite and the European Space Agency’s Herschel Infrared Space Observatory have found evidence suggesting supermassive black holes significantly influence the evolution of their host galaxies. They found data pointing to winds near a monster black hole blowing star-forming gas over 1,000 light-years from the galaxy center. Enough material to form around 800 stars with the mass of our own Sol.
“This is the first study directly connecting a galaxy’s actively ‘feeding’ black hole to features found at much larger physical scales,” said lead researcher Francesco Tombesi, an astrophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and the University of Maryland, College Park (UMCP). “We detect the wind arising from the luminous disk of gas very close to the black hole, and we show that it’s responsible for blowing star-forming gas out of the galaxy’s central regions.”
The artist’s view of galaxy IRAS F11119+3257 (F11119) above shows 3 million miles per hour winds produced near the supermassive black hole at its center heating and dispersing cold, dense molecular clouds that could form new stars. Astronomers believe these winds are part of a feedback mechanism that blows star-forming gas from galaxy centers, forever altering the structure and evolution of their host galaxy.
Astronomers have been studying the Monster of the Milky Way, the supermassive black hole with an estimated mass six million times that of Sol thought to reside at the center of our galaxy, for years. The monster black hole at the core of F11119 is thought to contain around 16 million times the mass of Sol. The accretion disk surrounding this supermassive black hole is measured at hundreds of times the diameter of our solar system. The 170 million miles per hour (270 million kilometers per hour) winds emanating from its accretion disk push the star-forming dust out of the central regions of the galaxy. Producing a steady flow of cold gas over a thousand light-years across traveling at around 2 million mph (3 million kph) and moving a volume of mass equal to around 800 Suns.
Astrophysicists have been searching for clues to a possible correlation between the masses of a galaxy’s central supermassive black hole and its galactic bulge. They have observed galaxies with more massive black holes generally, have bulges with proportionately larger stellar mass. The steady flow of material out of the central regions of galaxy F11119 and into the galactic bulge could help explain this correlation.
“These connections suggested the black hole was providing some form of feedback that modulated star formation in the wider galaxy, but it was difficult to see how,” said team member Sylvain Veilleux, an astronomy professor at UMCP. “With the discovery of powerful molecular outflows of cold gas in galaxies with active black holes, we began to uncover the connection.”
“The black hole is ingesting gas as fast as it can and is tremendously heating the accretion disk, allowing it to produce about 80 percent of the energy this galaxy emits,” said co-author MarcioMeléndez, a research associate at UMCP. “But the disk is so luminous some of the gas accelerates away from it, creating the X-ray wind we observe.”
When the supermassive black hole’s most active, it clears cold gas and dust from the center of the galaxy and shuts down star formation in this region. It also allows shorter-wavelength light to escape from the accretion disk of the black hole astronomers can study to learn more. We’ll keep you updated on any additional discoveries.
What’s the conclusion?
Astrophysicists conclude F11119 could be an early evolutionary phase of a quasar, a type of active galactic nuclei (AGN) with extreme emissions across a broad spectrum. Computer simulations show the supermassive black hole should eventually consume the gas and dust in its accretion disk and then its activity should lessen. Leaving a less active galaxy with little gas and a comparatively low level of star formation.
Astrophysicists and scientists look forward to detecting and studying feedback mechanisms connected with the growth and evolution of supermassive black holes using the enhanced ability of ASTRO-H. A joint space partnership between Japan’s Aerospace Exploration Agency (ISAS/JAXA) and NASA’s Goddard Space Flight Center, Suzaku’s successors expected to lift the veil surrounding this mystery even more and lay the foundation for one day understanding a little more about the universe and its mysteries.
Watch an animation made by NASA’s Goddard Space Flight Center showing how black hole feedback works in quasars here.
The seed out of which some of these mysterious, lurking monsters were born
Space news (astrophysics: black hole formation: early black holes) – supermassive black holes scattered around the observable universe –
Astronomers believe and data suggests at the center of nearly all large galaxies, including the Milky Way, lurks a supermassive black hole with millions and even billions of times the mass of our sun. Gigantic black holes that in some cases formed less than a billion years after the birth of the cosmos. For the first time, they have uncovered evidence suggesting some of these early supermassive black holes formed directly during the collapse of a giant gas cloud. A finding making astronomers rethink current theories on the formation of these enigmatic, invisible monsters.
“Our discovery, if confirmed, explains how these monster black holes were born,” said Fabio Pacucci of Scuola Normale Superiore (SNS) in Pisa, Italy, who led the study. “We found evidence that supermassive black hole seeds can form directly from the collapse of a giant gas cloud, skipping any intermediate steps.”
Intermediate steps like the formation of a supermassive star and its subsequent destruction during a supernova. Evidence to date suggests black holes are formed during this process and then supermassive black holes are produced by mergers between black holes. But this new finding suggests things get a little weirder than first thought. Maybe things are weirder than we could ever imagine. It could be the first supermassive black holes seeds were intermediate mass black holes, monsters in the 20,000 solar mass range. Watch this YouTube video on black hole formation.
Imagine the volume of a gas cloud capable of contracting directly into an object tens times, or more, the mass of Sol. Black hole seeds built up by drawing in cold gas and dust appear to have formed within the first billion years of the cosmos. Maybe once they confirm the existence of the two black hole seeds they think they detected. They can try to get some data on the mass of these early black hole seeds. At the moment, no mass data is available. Watch this YouTube video on black hole seeds.
The forming of a supermassive black hole directly from the collapse of a massive cloud of gas seems even weirder than the observed formation process for supermassive black holes. But we’re not in Kansas anymore, so anything could theoretically be possible. I am certain, things are even weirder than we can imagine.
“There is a lot of controversy over which path these black holes take,” said co-author Andrea Ferrara, also of SNS. “Our work suggests we are narrowing in on an answer, where the black holes start big and grow at the normal rate, rather than starting small and growing at a very fast rate.”
The team used computer models of the formation of black hole seeds combined with new techniques and methods to identify two possible candidates for early supermassive black holes in long-exposure Hubble, Chandra, and Spitzer images. The data collected on these two candidates matches the theoretical profile expected and estimates of their age suggest they formed when the cosmos was less than a billion years old. But more study is needed to verify the data and existence of these theoretical early black hole seeds.
“Black hole seeds are extremely hard to find and confirming their detection is very difficult,” said Andrea Grazian, a co-author from the National Institute for Astrophysics in Italy. “However, we think our research has uncovered the two best candidates to date.”
The team plans additional observations to see if these two candidates have other properties of black hole seeds as computer simulations predict. Real evidence to prove or disprove their early supermassive black hole formation theory might have to wait for a few years. Until the James Webb Space Telescope, European Extremely Large Telescope and other assets come online. The team and other astronomers are currently designing the theoretical framework needed to interpret future data and pinpoint the existence of some of the first supermassive black holes ever to exist. Watch this YouTube video on the jet of Centaurus A.
Read the scientific paper released on the first identification of black hole seeds here.
A flat and dust-filled disk orbiting a bright galactic bulge
Space news (February 20, 2016) – over 65 million light-years away in the constellation Virgo (The Virgin) –
This startling Hubble Space Telescope image of spiral galaxy NGC 4845 highlights its spiral structure but hides a monster. Deep within the center astronomers have detected a supermassive black hole, estimated to be in the hundreds of thousands of times the mass of Sol.
By following the movements of the innermost stars of NGC 4845, astronomers were able to determine they orbit around the center of the galaxy at a velocity indicating the presence of a supermassive black hole.
Scientists previously used the same method to discover the presence of the supermassive black hole at the center of the Milky Way – Sagittarius A*. The Monster of the Milky Way has a mass around 4 million times that of our sun, which is slightly bigger than the supermassive black hole at the center of NGC 4845.
Astronomers also discovered the supermassive black hole deep within the center of NGC 4845 is a hungry monster that devours anything that falls too far into its gravity well. In 2013 astronomers studying a different island universe, noticed a violent flare erupting from the center of NGC 4845.
Astronomers discovered an object many times the mass of Jupiter had fallen into the gravity well of this monster and was devoured. The violent flare erupting from the center of NGC 4845 was the death throes of a brown dwarf or large planet as it was being torn apart and drawn deeper into the gravity well of the supermassive black hole.