A monster lurks at the heart of many galaxies – even our own Milky Way. This monster possesses the mass of millions or billions of Suns. Immense gravity shrouds it within a dark cocoon of space and time – a supermassive black hole. But while hidden in darkness and difficult to observe, black holes can also shine brighter than an entire galaxy. When feeding, these sleeping monsters awaken transforming into a quasar – one of the Universe’s most luminous objects. The energy a quasar radiates into space is so powerful, it can interfere with star formation for thousands of light years across their host galaxies. But one galaxy appears to be winning a struggle against its awoken blazing monster and in a recent paper published in the Astrophysical Journal, astronomers are trying to determine how this galaxy survives.Continue reading “A Galaxy is Making New Stars Faster Than its Black Hole Can Starve Them for Fuel”
There’s a bit of a mystery buried in the heart of the Cigar Galaxy, known more formally as M82 or Messier 82. Shining brightly in X-rays is a black hole (called M82 X-1) that straddles an unusual line between small and huge black holes, new research has revealed.
The new study reveals for the first time just how big this black hole is — about 400 times the mass of the sun — after about a decade of struggling to figure this out.
“Between the two extremes of stellar and supermassive black holes, it’s a real desert, with only about half a dozen objects whose inferred masses place them in the middle ground,” stated Tod Strohmayer, an astrophysicist at NASA’s Goddard Space Flight Center in Maryland.
Scientists figured this out by looking at changes in brightness in X-rays, which fluctuate according to how gas behaves as it falls towards a black hole. At the event horizon — that spot where you’re doomed, even if you’re light — is where the fluctuation happen most frequently. In general, larger black holes have these fluctuations less frequently, but they weren’t sure if this would apply to something that is of M82 X-1’s size.
But by going through old data from NASA’s Rossi X-ray Timing Explorer (RXTE) satellite — which ceased operations in 2012 — the scientists uncovered a similar pulsing relationship to what you see in larger black holes.
Specifically, they saw X-ray variations repeating 5.1 and 3.3 times a second, which is a similar 3:2 ratio to other black holes studied. This allows them to extend the measurement scale to this black hole, NASA stated.
Results of the study were published this week in Nature. The research was led by Dheeraj Pasham, a graduate student at the University of Maryland, College Park.
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Host: Fraser Cain & Scott Lewis
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Continue reading “Virtual Star Party – March 16, 2014”
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Astronomers: David Dickinson, Gary Gonella, James McGee, Mike Simmons, Roy Salisbury, Shahrin Ahmad, Tom Nathe
Jupiter with a nice view of the red spot, Venus approaching zenith, Bubble Nebula, the Pleiades, Orion Nebula, Horsehead Nebula, Flame Nebula, Running Man Nebula, the Moon, the Sun, the ISS (photo), the Rosette Nebula, Orion again, M33, Sunspots, Rosette again, California Nebula (multiple views), M81 & M82, Planet “X” (?!?), Andromeda, Flame Nebula again
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‘Wobbly’ Alien Planet Has Weird Seasons And Orbits Two Stars
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Radio light, radio bright: when you look at M82 in this frequency range, a whole lot of activity pops out. The “Cigar Galaxy” is just 12 million light-years away from Earth and these days, is best known for hosting a supernova or star explosion so bright that amateurs can spot it in a small telescope.
Take a big radio telescope and peer at the galaxy’s center, and a violent picture emerges. Bright star nurseries and supernova leftovers are visible in this image from the Karl G. Jansky Very Large Array (the scientists can tell those apart using other data from the telescope.)
“The radio emission seen here is produced by ionized gas and by fast-moving electrons interacting with the interstellar magnetic field,” the National Radio Astronomy Observatory stated.
Most intriguing to scientists in this picture are the streamers of material in this area of M82, which is about 5,200 light-years across in the pictured central region. These previously undetected “wispy features” could be related to “superwind” coming from all this stellar activity, but scientists are still examining the link.
By the way, Supernova SN 2014J is not visible in this image because it is not active in radio waves. You can check out optical pictures of it, however, at this past Universe Today story.
In a rare example of cloudy weather helping astronomy rather than hurting it, the team that found M82’s new supernova swung a telescope in that direction only because their planned targets for the night were obscured, a release stated.
The exploding star in the “Cigar Galaxy” was found at 7:20 p.m. UTC (2:20 p.m. EST) during a class taught by Steve Fossey at the University of London Observatory. Students Ben Cooke, Tom Wright, Matthew Wilde and Guy Pollack all participated in the discovery.
“The weather was closing in, with increasing cloud,” recalled Fossey in a press release, “so instead of the planned practical astronomy class, I gave the students an introductory demonstration of how to use the CCD camera on one of the observatory’s automated 0.35–metre [1.14-foot] telescopes.”
The students asked for M82, at which point Fossey saw a star that he couldn’t recall from examining the galaxy previously. A search of other images online revealed that something strange was happening, but clouds were obscuring everything quickly. The team focused on taking one- and two-minute exposures with different filters, and also using a second telescope to make sure there wasn’t something wrong with the first.
The team checked for any reports of a supernova, and finding none, Fossey sent a message to the International Astronomical Union’s Central Bureau for Astronomical Telegrams (which catalogs supernovae) and a United States team that does regular searches for exploding stars. Among his concerns was that it could be an asteroid lying in the way of the galaxy, but further spectroscopic measurements confirmed the “fluke” find, the release added.
The great thing about SN 2014J is it’s visible even in small telescopes. It’s also fairly close, by astronomical standards, at about 12 million light-years away. (The closest found since the invention of the telescope was Supernova 1987A, which exploded in February 1987 and was 168,000 light-years away.) Astrophotographers have already snapped many images of the exploding star.
“One minute we’re eating pizza, then five minutes later we’ve helped to discover a supernova,” stated Wright. “I couldn’t believe it. It reminds me why I got interested in astronomy in the first place.”
Source: University College London
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Continue reading “Virtual Star Party – January 26, 2014: Our Missed Supernova!”
Images keep pouring in of the biggest excitement in astronomy this week, a new Type Ia supernova in the Cigar Galaxy, 82, about 12 million light years away. As has been said, the Cigar got lit!
This is the closest supernova of this type since the 1800’s. Astrophotographers have been out in full force trying to nab this event, we’ve got more great images to share today, and we’ll keep adding them as they come in.
If you haven’t been able to take a look for yourself, you can join a live webcast from the folks at the Virtual Telescope Project on Saturday, January 25, 2014 at 20:30 UTC (3 pm EST, 1 pm PST), which you can watch here.
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Continue reading “Weekly Space Hangout – January 24, 2014: LEGO Mars Rover & the Supernova We Missed in the Star Party!”