A world workforce of astronomers experiences the detection of a brand new protocluster of galaxies. The newfound protocluster, designated QO-1000, comprises at the least 14 large quiescent galaxies. The discovering was detailed in a paper revealed January 21 on the arXiv pre-print server.
Galaxy clusters comprise from a whole lot to 1000’s of galaxies certain collectively by gravity. They’re the most important recognized gravitationally certain buildings within the universe, and will function glorious laboratories for finding out galaxy evolution and cosmology.
Astronomers are particularly fascinated with research of protoclusters of galaxies, the progenitors of clusters. Such objects, discovered at excessive redshifts (over 2.0), may present important details about the universe at its early phases.
Now, a brand new high-redshift protocluster has been discovered by a bunch of astronomers led by Kei Ito of the College of Tokyo, Japan. The invention is a results of an evaluation of the info from the Cosmic Evolution Survey (COSMOS) and spectroscopic observations utilizing the Keck I telescope.
“We search overdense buildings of quiescent galaxies at z ∼ 3 within the COSMOS subject in ∼ 2 deg2 primarily based on the projected distribution of quiescent galaxies,” the researchers defined.
In outcome, they discovered such an overdensity of 14 quiescent galaxies at a redshift of two.77. The protocluster, which acquired designation QO-1000, consists of 4 large galaxies with low particular star formation charges. The outcomes counsel that this construction is at the least 68 occasions denser in quiescent galaxies than within the normal subject and that its quiescent fraction is about 3 times greater than the typical worth at this redshift.
The astronomers famous that the excessive stellar mass of spectroscopically confirmed quiescent galaxies of QO-1000 signifies they’re hosted in an enormous halo. They added that the construction is more likely to be hosted by a way more large halo than the opposite typical quiescent galaxies with the identical stellar mass.
The researchers assume that QO-1000 is due to this fact a extra mature protocluster than most recognized protoclusters and is probably going in a transition phase from star-forming protoclusters to native quenched clusters. In line with the authors of the paper, their discovering proves that even at a redshift of virtually 3.0, protocluster galaxies may be quenched, and quiescent galaxies can type an overdense construction. They hope that additional research of QO-1000 will assist us advance our information concerning the evolution of protoclusters.
“This construction might be a perfect laboratory to discover the evolutionary history of (proto)clusters and galaxies therein. Extra detailed investigations of member quiescent galaxies on this construction might be performed in our future research, similar to constraining star formation historical past primarily based on the spectra and multi-band photometry, investigating morphology utilizing HST/F160W photos (3D-DASH Mowla et al. 2022), estimating dynamical mass, and evaluating them with simulations,” the scientists concluded.
Extra data:
Kei Ito et al, COSMOS2020: Discovery of a protocluster of large quiescent galaxies at z = 2.77, arXiv (2023). DOI: 10.48550/arxiv.2301.08845
Journal data:
arXiv
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New protocluster of large quiescent galaxies found (2023, January 31)
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