Mysterious ‘zombie star’ speeds through the Milky Way at 177,000 km/h, capable of ripping human atoms; origin remains unknown | – The Times of India
In a stunning cosmological find, astronomers saw an ultra-massive and magnetic stellar remnant speeding through our galaxy at record speed. Called a “zombie star,” the object—properly known as SGR 0501+4516—is moving through the Milky Way at over 110,000 miles per hour (177,000 km/h). Even more dramatic is the star’s fatal magnetic field capable of ripping human matter apart atom by atom.
But aside from its velocity and brutality, the origin of this star is confounding astronomers and could redefine existing theories of how such objects are formed.
A ‘zombie star’ SGR 0501+4516 moving through Milky Way
SGR 0501+4516 is a magnetar—a neutron star with an unusual and extreme magnetic field. Neutron stars in general are dense remnants of giant stars that exploded as supernovae. Though tiny, a little larger than a city, neutron stars contain more mass than our Sun and are among the densest objects known in the universe, except for black holes.
Magnetars, though, take it a step further. With magnetic fields as much as 100 trillion times more powerful than Earth’s, they are the most magnetic objects in the universe. Only about 30 of these objects have been found in our galaxy.
SGR 0501+4516 was discovered in 2008, about 15,000 light-years from Earth. But a new study published April 15 in the journal Astronomy & Astrophysics has found something surprising: it’s not only strong—it’s also speeding through space at a surprisingly high speed.
Magnetic field strength of the ‘zombie star’
The magnetic field strength of SGR 0501+4516 is unimaginable. If it were to fly by at half the distance to the Moon, its magnetism would wipe out all credit cards on the planet. Get within 600 miles, and its magnetic force would dissolve the human body on an atomic level. Fortunately, the magnetar is no threat to our solar system and will stay safely far away.
By employing data from the European Space Agency’s Gaia spacecraft as well as the Hubble Space Telescope, scientists tracked the magnetar’s recent history and discovered a great enigma. At first assumed to have been born of the local supernova remnant HB9, SGR 0501+4516 was travelling much too quickly—and in the opposite direction—to have been born out of that place.
Indeed, when researchers mapped its galactic trajectory over the course of millennia, they found it doesn’t seem to be associated with any supernova remnants or giant star clusters. That’s a fly in the ointment of the conventional view of magnetar formation.
Zombie star hints at rare cosmic transformation
This surprising path has brought astronomers to a new theory: SGR 0501+4516 could have developed without a supernova explosion whatsoever. Rather, it could have resulted from the direct collapse of a white dwarf—the dense core that remains after a medium-sized star exhausts its fuel.
Usually, a white dwarf would explode as a supernova if nuclear reactions are triggered within it. But in exceptional conditions, theorists have suggested, it could instead collapse directly into a neutron star without going through the explosive stage.
“We think that this magnetar might have been formed through this exotic pathway,” said Andrew Levan, study co-author and astronomer at Radboud University and the University of Warwick.
Zombie star theory could unlock cosmic mysteries
This uncommon formation mechanism may have wider cosmic implications. If white dwarf collapse can actually produce magnetars, it may shed light on the enigmatic fast radio bursts (FRBs)—brief, brilliant pulses of radio waves—from distant galaxies that are too old to contain star deaths.
The group stresses that additional observational information is required to verify this theory. But the research raises new questions regarding magnetar formation and their contribution toward creating some of the universe’s most powerful and fleeting phenomena. “Figuring out where magnetars are born is one of the greatest challenges of high-energy astrophysics,” said study co-author Nanda Rea, an astrophysicist at Spain’s Institute of Space Sciences in Barcelona. “It might help us understand some of the most violent events in the universe.”
Also Read | NASA astronaut Don Pettit to discuss his seven-month space mission on April 28 – live streaming, time and how you can participate
In a stunning cosmological find, astronomers saw an ultra-massive and magnetic stellar remnant speeding through our galaxy at record speed. Called a “zombie star,” the object—properly known as SGR 0501+4516—is moving through the Milky Way at over 110,000 miles per hour (177,000 km/h). Even more dramatic is the star’s fatal magnetic field capable of ripping human matter apart atom by atom.
But aside from its velocity and brutality, the origin of this star is confounding astronomers and could redefine existing theories of how such objects are formed.
A ‘zombie star’ SGR 0501+4516 moving through Milky Way
SGR 0501+4516 is a magnetar—a neutron star with an unusual and extreme magnetic field. Neutron stars in general are dense remnants of giant stars that exploded as supernovae. Though tiny, a little larger than a city, neutron stars contain more mass than our Sun and are among the densest objects known in the universe, except for black holes.
Magnetars, though, take it a step further. With magnetic fields as much as 100 trillion times more powerful than Earth’s, they are the most magnetic objects in the universe. Only about 30 of these objects have been found in our galaxy.
SGR 0501+4516 was discovered in 2008, about 15,000 light-years from Earth. But a new study published April 15 in the journal Astronomy & Astrophysics has found something surprising: it’s not only strong—it’s also speeding through space at a surprisingly high speed.
Magnetic field strength of the ‘zombie star’
The magnetic field strength of SGR 0501+4516 is unimaginable. If it were to fly by at half the distance to the Moon, its magnetism would wipe out all credit cards on the planet. Get within 600 miles, and its magnetic force would dissolve the human body on an atomic level. Fortunately, the magnetar is no threat to our solar system and will stay safely far away.
By employing data from the European Space Agency’s Gaia spacecraft as well as the Hubble Space Telescope, scientists tracked the magnetar’s recent history and discovered a great enigma. At first assumed to have been born of the local supernova remnant HB9, SGR 0501+4516 was travelling much too quickly—and in the opposite direction—to have been born out of that place.
Indeed, when researchers mapped its galactic trajectory over the course of millennia, they found it doesn’t seem to be associated with any supernova remnants or giant star clusters. That’s a fly in the ointment of the conventional view of magnetar formation.
Zombie star hints at rare cosmic transformation
This surprising path has brought astronomers to a new theory: SGR 0501+4516 could have developed without a supernova explosion whatsoever. Rather, it could have resulted from the direct collapse of a white dwarf—the dense core that remains after a medium-sized star exhausts its fuel.
Usually, a white dwarf would explode as a supernova if nuclear reactions are triggered within it. But in exceptional conditions, theorists have suggested, it could instead collapse directly into a neutron star without going through the explosive stage.
“We think that this magnetar might have been formed through this exotic pathway,” said Andrew Levan, study co-author and astronomer at Radboud University and the University of Warwick.
Zombie star theory could unlock cosmic mysteries
This uncommon formation mechanism may have wider cosmic implications. If white dwarf collapse can actually produce magnetars, it may shed light on the enigmatic fast radio bursts (FRBs)—brief, brilliant pulses of radio waves—from distant galaxies that are too old to contain star deaths.
The group stresses that additional observational information is required to verify this theory. But the research raises new questions regarding magnetar formation and their contribution toward creating some of the universe’s most powerful and fleeting phenomena. “Figuring out where magnetars are born is one of the greatest challenges of high-energy astrophysics,” said study co-author Nanda Rea, an astrophysicist at Spain’s Institute of Space Sciences in Barcelona. “It might help us understand some of the most violent events in the universe.”
Also Read | NASA astronaut Don Pettit to discuss his seven-month space mission on April 28 – live streaming, time and how you can participate
