Massive and multiphase gas outflow detected in the galaxy COSMOS-11142

Utilizing the James Webb Area Telescope (JWST), a global workforce of astronomers has carried out deep spectroscopic observations of a galaxy referred to as COSMOS-1142. In consequence, they detected large and multiphase outflow of impartial and ionized fuel on this galaxy. The discovering was reported in a paper printed August 10 on the pre-print server arXiv.

At a redshift of two.445, COSMOS-11142 is a massive galaxy with a half-light radius of about 2,000 mild years. Earlier observations of COSMOS-11142 have discovered that it’s within the “post-starburst” phase instantly following the fast quenching of a star formation episode. The present star-formation charge of this galaxy is estimated to be between one and 10 solar masses per 12 months.

A gaggle of astronomers led by Sirio Belli of the College of Bologna in Italy, has not too long ago noticed COSMOS-11142 with JWST’s Close to Infrared Spectrograph (NIRSpec). The observations, aimed toward investigating the properties of this galaxy, had been carried out in December 2022 as a part of the Blue Jay survey.

“We noticed the galaxy COSMOS-11142 as a part of the Blue Jay survey, a Cycle-1 JWST program that focused about 150 galaxies uniformly distributed in redshift z (1.7 < z < 3.5) and stellar mass M_∗ (log M_∗/M_⊙ > 9),” the researchers wrote within the paper.

The observations discovered that COSMOS-11142 is compact, elongated and comparatively dusty. The galaxy has a dynamical mass of about 70 billion solar plenty and its metallicity is estimated to be at a degree of roughly 0.16.

JWST imaging supplied proof of an outflow of impartial and ionized fuel throughout the fast quenching of COSMOS-11142’s star formation. The mass outflow charges for the impartial and ionized fuel outflow had been measured to be about 100 and one solar plenty per 12 months, respectively. The astronomers famous that the mass outflow charge of COSMOS-11142 is an order of magnitude bigger than the standard values measured in native star-forming galaxies.

Furthermore, the mass outflow charge in COSMOS-11142 turned out to be bigger than the residual star-formation charge. This implies that the fuel ejection probably has a robust influence on the evolution of the investigated galaxy. The researchers assume that the noticed outflow is pushed by active galactic nucleus (AGN) suggestions.

Primarily based on the outcomes, the authors of the paper concluded that the noticed outflow probably performs a key function within the fast quenching of COSMOS-11142. They added that the heating of the halo fuel by radio-mode AGN suggestions is probably going required to keep up this galaxy quiescent.

“We affirm that the system is a post-starburst galaxy: it shaped most of its stellar mass in a fast and highly effective starburst ∼ 300 Myr earlier than the observations, after which skilled a fast quenching of the star formation charge by two orders of magnitude,” the researchers concluded.

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