Astronomers report the discovery of a new massive and quiescent galaxy at a high redshift. The galaxy, which received designation COSMOS-1047519, was detected using the Keck I telescope. The finding was detailed in a paper published August 29 on the pre-print server arXiv.
Keck/MOSFIRE K-band spectrum of COSMOS-1047519 smoothed over 5 pixels. Credit: Kakimoto et al., 2023.
Astronomers report the discovery of a new massive and quiescent galaxy at a high redshift. The galaxy, which received designation COSMOS-1047519, was detected using the Keck I telescope. The finding was detailed in a paper published August 29 on the pre-print serverMassive galaxies that stopped forming stars are plausible progenitors of giant elliptical galaxies.
Now, a team of astronomers led by Takumi Kakimoto of the Graduate University for Advanced Studies in Japan, has confirmed the detection of another high-mass quiescent galaxy—at a redshift of 4.53. The finding was made using the Keck/MOSFIRE spectrograph. "We present the spectroscopic confirmation of a massive quiescent galaxy at z=4.53 based on the Keck/MOSFIRE observation. We confirm a very large stellar mass and a very low star formation rate from the extensive SED [spectral energy distribution] fitting using both the photometry and spectrum," the researchers wrote in the paper.
The observations found that COSMOS-1047519 has a mass of about 60 billion solar masses and a star-formation rate at a level of only 10
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