Utilizing the James Webb Area Telescope (JWST), a world staff of astronomers has noticed the galaxy cluster PLCK G165.7+67.0. The observational marketing campaign resulted within the detection of a brand new Kind I supernova. The discovering is reported in a paper printed September 13 on the pre-print server arXiv.
Supernovae (SNe) are highly effective and luminous stellar explosions. They’re necessary for the scientific group as they provide important clues into the evolution of stars and galaxies. On the whole, SNe are divided into two teams primarily based on their atomic spectra: Kind I (no hydrogen of their spectra) and Kind II (showcasing hydrogen spectral traces).
Kind Ia supernovae (SN Ia) are present in binary programs by which one of many stars is a white dwarf. Stellar explosions of this kind are necessary for the scientific group, as they provide important clues into the evolution of stars and galaxies.
A gaggle of astronomers led by Brenda L. Frye of the Steward Observatory in Tucson, Arizona, has not too long ago noticed PLCK G165.7+67.0 (or G165 for brief)—a galaxy cluster at a redshift of 0.35 with a mass of round 200–300 trillion solar plenty. Throughout these observations they detected a supernova at a redshift of 1.78 utilizing JWST’s Close to Infrared Digicam (NIRCam). The brand new supernova, dubbed “SN H0pe,” was recognized in Arc 2—an infrared-bright galaxy gravitationally amplified by G165.
“The SN is located 1.5–2 kpc from its host galaxy Arc 2 and seems in three totally different places because of gravitational lensing by G165. These knowledge can yield a price for Hubble’s fixed utilizing time delays from this multiply-imaged SN Ia that we name ‘SN H0pe,'” the researchers wrote within the paper.
SN H0pe is lensed into three distinct places, designated SN 2a, 2b, and 2c, subsequently it presents a singular alternative to find out Hubble’s fixed by measuring the time delays between its a number of pictures. Additional photometric and spectroscopic investigation of SN H0pe confirmed that it’s Kind Ia supernova.
In terms of the host galaxy Arc 2, the observations discovered that it has a stellar mass of about 500 billion solar plenty. The outcomes counsel that it has accomplished a star formation episode about one billion years in the past and is now surrounded by star-forming satellite dwarf galaxies.
JWST observations have additionally shed extra mild on the properties of G165. In accordance with the paper, G165 has a mass of roughly 260 trillion solar masses and showcases a velocity offset of the brightest cluster galaxy (BCG) from the systemic redshift of the cluster.
Summing up the outcomes, the authors of research famous that they’re additional inspecting the properties of SN H0pe and extra outcomes might be printed within the upcoming analysis paper.
Extra data:
Brenda L. Frye et al, The JWST Discovery of the Triply-imaged Kind Ia “Supernova H0pe” and Observations of the Galaxy Cluster PLCK G165.7+67.0, arXiv (2023). DOI: 10.48550/arxiv.2309.07326
Journal data:
arXiv
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