A gigantic spiral galaxy with powerful black hole jets has shocked scientists, showing that even galaxies like ours could unleash dangerous radiation one day. It challenges how we think galaxies evolve and survive
Astronomers have uncovered a spiral galaxy nearly a billion light-years away that hosts a supermassive black hole launching colossal jets of energy, something once thought possible only in elliptical galaxies.
This revelation not only challenges our current models of galaxy evolution but hints that the Milky Way could someday unleash similar jets, potentially endangering life on Earth. The galaxy in question, three times the size of the Milky Way, defies expectations by remaining structurally intact despite extreme forces. It also holds valuable clues about dark matter and cosmic evolution, pushing the boundaries of what we thought we knew about the universe.
An Unexpected Cosmic Powerhouse
A terrifying glimpse at one potential fate of our Milky Way galaxy has come to light thanks to the discovery of a cosmic anomaly that challenges our understanding of the universe.
An international team of astronomers led by CHRIST University, Bangalore, found that a massive spiral galaxy almost one billion light-years away from Earth harbours a supermassive black hole billions of times the Sun’s mass which is powering colossal radio jets stretching six million light-years across.
That is one of the largest known for any spiral galaxy and upends conventional wisdom of galaxy evolution, because such powerful jets are almost exclusively found in elliptical galaxies, not spirals.
It also means the Milky Way could potentially create similar energetic jets in the future – with the cosmic rays, gamma rays, and X-rays they produce wreaking havoc in our solar system because of increased radiation and the potential to cause a mass extinction on Earth.
The giant radio jets stretching six million light-years across and an enormous supermassive black hole at the heart of spiral galaxy J23453268−0449256, as imaged by the Giant Metrewave Radio Telescope. Credit: Bagchi and Ray et al/Giant Metrewave Radio Telescope.
If a spiral galaxy can not only survive but thrive under such extreme conditions, what does this mean for the future of galaxies like our own Milky Way?
“Could our galaxy one day experience similar high-energy phenomena that will have serious consequences for the survival of precious life in it?”
A Rare Galactic Specimen
In the new study, which has been published in Monthly Notices of the Royal Astronomical Society, researchers unraveled the structure and evolution of the spiral galaxy 2MASX J23453268−0449256, which is three times the size of the Milky Way.
Using observations from the Hubble Space Telescope, the Giant Metrewave Radio Telescope, the Atacama Large Millimeter Wave Array, and multi-wavelength analyses, they detected an enormous supermassive black hole at its heart and radio jets that are among the largest known for any spiral galaxy, making it a rare phenomenon.
Traditionally, scientists believed that the violent activity of such colossal jets of supermassive black holes would disrupt the delicate structure of a spiral galaxy.
Defying Expectations
Yet, against all odds, 2MASX J23453268−0449256 has retained its tranquil nature with well-defined spiral arms, a luminous nuclear bar, and an undisturbed stellar ring – all while hosting one of the most extreme black holes ever observed in such a setting.
Adding to the enigma, the galaxy is surrounded by a vast halo of hot, X-ray-emitting gas, providing key insights into its history. While this halo slowly cools over time, the black hole’s jets act like a cosmic furnace, preventing new star formation despite the presence of abundant star-making material.
How This Compares to Milky Way
Our own Milky Way has a 4 million solar mass black hole – Sagittarius A (Sgr A*) – at its centre, but this is currently in an extremely quiet and dormant state.
That could change if a gas cloud, star, or even a small dwarf galaxy were to be accreted (effectively eaten), the researchers said, potentially triggering significant jet activity. Such events are known as Tidal Disruption Events (TDE) and several have been observed in other galaxies, but not in the Milky Way.
If large jets like this were to emerge from Sgr A*, their impact would depend on their strength, direction, and energy output, the researchers said.
Potential threat to Earth
One pointed near our solar system could strip away planetary atmospheres, damage DNA and increase mutation rates because of radiation exposure, while if Earth were exposed to a direct or nearby jet, it could degrade our ozone layer and lead to a mass extinction.
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