Using the James Webb Space Telescope (JWST), an international team of astronomers has performed deep spectroscopic observations of a galaxy known as COSMOS-1142. As a result, they detected massive and multiphase outflow of neutral and ionized gas in this galaxy. The finding was reported in a paper published August 10 on the pre-print server arXiv.
At a redshift of 2.445, COSMOS-11142 is a massive galaxy with a half-light radius of about 2,000 light years. Previous observations of COSMOS-11142 have found that it is in the “post-starburst” phase immediately following the rapid quenching of a star formation episode. The current star-formation rate of this galaxy is estimated to be between one and 10 solar masses per year.
A group of astronomers led by Sirio Belli of the University of Bologna in Italy, has recently observed COSMOS-11142 with JWST’s Near Infrared Spectrograph (NIRSpec). The observations, aimed at investigating the properties of this galaxy, were conducted in December 2022 as part of the Blue Jay survey.
“We observed the galaxy COSMOS-11142 as part of the Blue Jay survey, a Cycle-1 JWST program that targeted about 150 galaxies uniformly distributed in redshift z (1.7 < z < 3.5) and stellar mass M∗ (log M∗/M⊙ > 9),” the researchers wrote in the paper.
The observations found that COSMOS-11142 is compact, elongated and relatively dusty. The galaxy has a dynamical mass of about 70 billion solar masses and its metallicity is estimated to be at a level of approximately 0.16.
2023-08-25 02:48:02
Post from phys.org
