Is bursting at its galactic seams, creating new stars at a rate more than 100 times faster than the Milky Way, due to gravitational interactions within its host galaxy group IC 342
Space news (astrophysics: starburst galaxies; NGC 1569) – 11 million light-years away toward the constellation Camelopardalis (The Giraffe) –
The Hubble Space Telescope image above reveals the chaotic, yet visually stunning core of starburst galaxy NGC 1569. A relatively small galaxy more recent calculations by astronomers show is actually 11 million light-years from Earth, which is one and half times further than previous distance estimates. This starburst galaxy is one of the brightest in galaxy group IC 342, which is just one of many groups of galaxies within the Virgo Supercluster and is located in the constellation of Camelopardalis (The Giraffe) in our night sky.
Look at the interior of NGC 1569 from different angles and the hues viewed seem to shift across its 5,000 light-year width. For almost 100 million years this starburst galaxy has created new stars at a rate over 100 times faster than our Milky Way. The core was a vigorous, hotbed of star formation bursting at the seams with new and old stars. It’s home to many super star clusters, three of which are visible in this image as brilliant blue clusters, each residing within a large cavity of gas carved out by successive supernovae of red giant supermassive stars.
NGC 1569’s new location puts it smack in the middle of ten galaxies within IC 342 interacting gravitationally, which compressed gas floating among its stars until it collapsed, heated up and formed new stars. A process Hubble’s Wide Field Planetary Camera 2 and Advanced Camera for Surveys were able to observe in September 1999, November 2006, and January 2007. Observations allowing for the creation of this stunning, amazing image of a starburst galaxy at work.
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Traveling at 250,000 mph would be a windy, visually spectacular ride to hell
Space news (Astrophysics: stellar nursery dynamics; runaway stars) – 170,000 light-years from Earth, near the edge of the Tarantula Nebula –
If you want to travel through the galaxy, hitch a ride on a runaway star like the one astronomers have been tracking since it came screaming out of 30 Doradus (Tarantula Nebula) in 2006. Data collected by the newly installed Cosmic Origins Spectrograph on the Hubble Space Telescope suggests a massive star, as much as 90 times the mass of Sol, was knocked out of the nebula by gravitational interactions with even more massive suns. Traveling at around 250,000 mph, voyaging through the cosmos on this runaway star would be an adventure to write home about.
The trail leads back to a star-forming region deep within the Tarantula Nebula called R136, where over 2,400 massive stars near the center of this huge nebula produce an intense wind of radiation. Astronomers think interactions with some of the 100 plus solar mass stars detected in this stellar nursery resulted in this runaway star being flung over 375 light-years by its bigger siblings.
“These results are of great interest because such dynamical processes in very dense, massive clusters have been predicted theoretically for some time, but this is the first direct observation of the process in such a region,” says Nolan Walborn of the Space Telescope Science Institute in Baltimore and a member of the COS team that observed the misfit star. “Less massive runaway stars from the much smaller Orion Nebula Cluster were first found over half a century ago, but this is the first potential confirmation of more recent predictions applying to the most massive young clusters.”
Astrophysicists studying the runaway star and the region in the Tarantula region where the trail ended believe it’s likely a massive, blue-white sun at least ten times hotter than Sol and only a few million years old. It’s far from home and in a region of space where no clusters with similar stars are found. It’s also left an egg-shaped cavity in its wake with glowing edges pointing in the direction of the center of 30 Doradus and the region of R136. A flaming trail you would see behind the star as you traveled across the cosmos and onto eternity.
“It is generally accepted, however, that R136 is sufficiently young, 1 million to 2 million years old, that the cluster’s most massive stars have not yet exploded as supernovae,” says COS team member Danny Lennon of the Space Telescope Science Institute. “This implies that the star must have been ejected through dynamical interaction.”
This runway star continues to scream across the cosmos, nearing the outskirts of 30 Doradus a star-forming region in the Large Magellanic Cloud, it will one day end its existence in a titanic explosion or supernova, and possibly leave behind one of the most mysterious and enigmatic objects discovered during the human journey to the beginning of space and time, a black hole.
Imagine riding this runaway star until it contracted into a black hole and left our universe altogether. Where would we travel? To a random location in spacetime? To another reality or universe? The possibilities abound and far exceed our ability to imagine such a reality. Scientists tell us such a journey wouldn’t be possible, but they’re just stumbling around in the dark looking for ideas to grasp. For handholds on the dark cliff we climb as we search for answers to the mysteries before us.
Astronomers continue to study the Tarantula Nebula and the star-forming region R136 looking for signs of impending supernovae among the zoo of supermassive stars within. They also continue to track this runaway star and two other blue hot, supermassive stars outside the boundary of 30 Doradus that appear to have also been ejected from their host systems. We’ll update you with any news on it, and other runaway stars as it continues to scream across the cosmos.
Image credit: ESA/Hubble & NASA, Acknowledgement: Matej Novak Text credit: European Space Agency
Space news (August 14, 2015) – planetary nebula NGC 6565; 6 degrees off center of the Milky Way, 15,200 light-yearstoward constellation Sagittarius, about halfway to the central core –
NASA’s Hubble Space Telescope captured this image of a dying star during the final moments of its life cycle. Lasting tens of thousands of years on human time scales, the death of this star is but a brief moment in cosmic time.
Called planetary nebula NGC 6565, Hen 2-362 or ESO 456-70, depending on the space institute or astronomer you ask, this object will eventually shrink down to become a white dwarf star.
Similar to the color display to the well-known Ring Nebula (heic 1310), the stunning cloud of colorful gas seen here was ejected from the dying star due to strong stellar winds pushing the outer layers into space. The luminous core viewed was exposed in the process, which allowed ultraviolet radiation to excite the surrounding gas to different temperatures, producing this visually attractive display of color.
NASA scientists study planetary nebula like NGC 6565 to better understand the life cycle and death of stars that end their lives as white dwarf stars. The data obtained through the study of this planetary nebula will be added to the material already obtained concerning similar stellar objects. This will help astrophysics develop better ideas and theories concerning the life of stars that end their days as white dwarf stars.
You can learn more about the discoveries of the Hubble Space Telescope here.