NGC 1266 is a fascinating cosmic object frozen between two identities, offering astronomers insights into the cessation of star formation.
This Hubble image illustrates lenticular galaxy NGC 1266, showcasing reddish-brown dust clumps that obscure its surface while distant galaxies radiate red, blue, and orange light. Image credits: NASA/ESA/K. Alatalo, STScI/G. Kober, NASA, and The Catholic University of America.
Located approximately 100 million light-years away in the constellation Eridanus, NGC 1266 is a distinguished lenticular galaxy.
Astronomers classify NGC 1266 as a transitional galaxy, serving as an evolutionary bridge between spiral and elliptical galaxies.
“The lenticular shape features a bright central bulge with a spiral-like disk, yet lacks spiral arms and minimal elliptical star formation,” Hubble experts explained.
“While its structure and classification are intriguing, they are not the galaxy’s most remarkable attributes.”
“NGC 1266 is identified as a rare post-starburst galaxy, positioned in the transition between galaxies that have experienced significant star formation and quieter elliptical galaxies,” the researchers noted.
Post-starburst galaxies, which comprise about 1% of the local galaxy population, boast young stars but few active star-forming regions.
Approximately 500 million years ago, NGC 1266 experienced a minor merger with another galaxy.
“This merger triggered new star formation and injected gas into the supermassive black hole, thus augmenting the mass of the galaxy’s central bulge,” astronomers reported.
“The influx of material heightened the activity of the black hole, leading to the formation of an active galactic nucleus.”
“This increased black hole activity likely generated powerful winds and jets of gas along its rotation axis.”
Over time, the explosive formation of new stars and the black hole’s powerful jets depleted the galaxy’s star-forming gas, while turbulence from these processes impeded further star formation.
Through observations from Hubble and other telescopes, astronomers discovered strong gas outflows from NGC 1266 and significant disturbances in its interstellar space.
Their findings revealed that star nurseries are concentrated in the galaxy’s center, with little to no star formation occurring beyond that region.
“These observations imply that supermassive black holes at galaxy centers may inhibit star birth by stripping or ejecting star-forming gas,” the researchers concluded.
“The shock waves produced by this activity generate turbulence that disrupts the interstellar gas and dust, preventing the remaining material from condensing into new stars.”
Source: www.sci.news
