A fascinating discovery has been made in a nearby galaxy, VV 340a, where researchers have observed the galaxy draining itself of star-forming fuel. This phenomenon is attributed to the supermassive black hole at the galaxy’s core, which is emitting vast streams of superheated material into space. This process is limiting the formation of new stars in the galaxy, as the ejected material is heating and removing the star-forming gas.
Astrophysicist Justin Kader from the University of California, Irvine, describes this as the first time a kiloparsec-scale precessing radio jet has been observed driving a massive coronal gas outflow in a galaxy. The black hole’s activity is significantly impacting the star formation rates in VV 340a.
While supermassive black holes are essential for galaxy formation, they can also inhibit star formation through various mechanisms collectively known as ‘feedback’. These mechanisms include powerful jets, radiation pressure, and black hole winds generated as the black hole consumes matter at a rapid pace.
The jets observed in VV 340a extend approximately 20,000 light-years in each direction from the black hole, filled with shock-heated, ionized gas. These jets are the largest and most extended structures of shock-heated, highly ionized coronal gas ever discovered, exceeding typical observations by a factor of 30 or more.
Despite not being particularly powerful, the jets from VV 340a are funneling a substantial amount of mass away from the galaxy, equivalent to about 19.4 times the mass of the Sun annually. This evacuation of star-forming material is shaping the galaxy’s bidirectional jet into a helix, a unique feature that may affect the efficiency of material removal.
The researchers suggest that the helical jets in VV 340a are interacting with the galaxy’s gas and dragging it along, heating it to unprecedented temperatures at considerable distances from the black hole. This phenomenon is typically seen in older galaxies, making VV 340a’s relatively young age and ongoing merger with another galaxy particularly intriguing.
While the impact on star formation in VV 340a may be temporary due to the ongoing merger, the discovery sheds light on the complex processes at play in galaxies. Astronomers are excited to further explore such phenomena using advanced tools like JWST to uncover more mysteries of the universe.
The findings of this study have been published in the journal Science, providing valuable insights into the interplay between supermassive black holes and star formation in galaxies.
