Astronomers have reported the invention of a brand new galaxy utilizing the James Webb Area Telescope (JWST) as a part of the JWST COSMOS-Net survey. The newly found object, named JWST-ER1, is a big and compact silent galaxy. The findings are detailed in a paper printed on September 14 on the pre-print server arXiv.
Large galaxies which have stopped forming stars (referred to as huge quiescent galaxies) are believable precursors to massive elliptical galaxies. On condition that these objects fashioned stars earlier and accrued their stellar mass extra shortly, they may very well be essential for bettering our understanding of the method of galaxy evolution.
Now a group of astronomers led by Pieter van Dokkum of Yale College studies the detection of a brand new galaxy of this sort, which has been designated JWST-ER1. The item was recognized with JWST’s Close to Infrared Digital camera (NIRCam) as a part of the continuing broad and deep survey of as much as 1 million galaxies referred to as COSMOS-Net. One of the crucial outstanding options of JWST-ER1 is the so-called Einstein ring: a phenomenon during which gentle seems as a hoop as a consequence of gravitational lensing.
“The galaxy and its ring have been recognized in JWST NIRCam observations within the context of the COSMOS-Net challenge, a wide-area public survey utilizing the F115W, F150W, F277W and F444W filters,” defined the researchers.
NIRCam observations present that JWST-ER1 consists of a compact early-type galaxy (JWST-ER1g) and a whole Einstein ring (JWST-ER1r) with two hanging purple concentrations. The diameter of the middle of the ring was measured to be roughly 1.54 arcseconds.
The brand new galaxy was discovered at a redshift of 1.94, has a radius of about 21,500 light-years and its mass is estimated at 650 billion photo voltaic lots. The outcomes point out an age of 1.9 billion years and a low star formation price of 4 photo voltaic lots per 12 months. Due to this fact, JWST-ER1 is a big and quiet galaxy. It’s also fairly compact, like different quiet galaxies with comparable redshifts.
On the subject of the ring JWST-ER1r, the astronomers found that it’s produced by a background galaxy with a photometric redshift of two.98. It joins numerous recognized Einstein rings, though most are incomplete.
The research additionally discovered that JWST-ER1 is sort of completely spherical and that no apparent star-forming areas, tidal tails or different irregularities have been recognized within the NIRCam photographs.
The authors of the paper suggest additional observations of JWST-ER1 to analyze whether or not close by galaxies or buildings alongside the road of sight may contribute to its mass and likewise to analyze whether or not JWST-ER1 is the central galaxy of the progenitor of a cluster .
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