Physicists remedy puzzle about historical galaxy discovered by Webb telescope

Final September, the James Webb House Telescope, or JWST, found JWST-ER1g, an enormous historical galaxy that shaped when the universe was only a quarter of its present age. Surprisingly, an Einstein ring is related to this galaxy. That is as a result of JWST-ER1g acts as a lens and bends mild from a distant supply, which then seems as a hoop—a phenomenon referred to as robust gravitational lensing, predicted in Einstein’s principle of common relativity.

The overall mass enclosed throughout the ring has two parts: stellar and darkish matter parts.

“If we subtract the stellar mass from the full mass, we get the darkish matter mass throughout the ring,” stated Hai-Bo Yu, a professor of physics and astronomy on the College of California, Riverside, whose staff has revealed new work about JWST-ER1g within the journal The Astrophysical Journal Letters. “However the worth for the darkish matter mass appears larger than anticipated. That is puzzling. In our paper, we provide a proof.”

A darkish matter halo is the halo of invisible matter that permeates and surrounds a galaxy like JWST-ER1g. Though darkish matter has by no means been detected in laboratories, physicists are assured darkish matter, which makes up 85% of the universe’s matter, exists.

“When extraordinary matter—pristine gasoline and stars—collapses and condenses into the darkish matter halo of JWST-ER1g, it might be compressing the halo, resulting in a excessive density,” stated Demao Kong, a second-year graduate scholar at UCR, who led the evaluation. “Our numerical research present that this mechanism can clarify the excessive darkish matter density of JWST-ER1g—extra darkish matter mass in the identical quantity, leading to larger density.”

In accordance with Daneng Yang, a postdoctoral researcher at UCR and co-author on the paper, JWST-ER1g, shaped 3.4 billion years after the Large Bang, gives “an amazing probability to find out about darkish matter.”

“This robust lensing object is exclusive as a result of it has an ideal Einstein ring, from which we will acquire worthwhile details about the full mass throughout the ring, a important step for testing darkish matter properties,” he stated.

Launched on Christmas Day in 2021, NASA’s JWST is an orbiting infrared observatory. Additionally referred to as Webb, it’s designed to reply questions in regards to the universe. It’s the largest, most advanced, and strongest house telescope ever constructed.

“JWST gives an unprecedented alternative for us to look at historical galaxies shaped when the universe was younger,” Yu stated. “We anticipate to see extra surprises from JWST and be taught extra about darkish matter quickly.”

The examine was supported by the John Templeton Basis and the U.S. Division of Vitality.

The title of the open access research paper is “Chilly Darkish Matter and Self-interacting Darkish Matter Interpretations of the Sturdy Gravitational Lensing Object JWST-ER1.”