Astronomers Find Extreme Galaxy With Intense Ultraviolet Luminosity Comparable to a Quasar

Astronomers Find Extreme Galaxy With Intense Ultraviolet Luminosity Comparable to a Quasar

Left and middle: Image of the area of the sky containing BOSS-EUVLG1, which stands out as a result of its blue colour. Credit: DESI Legacy Imaging Surveys. Right: Artist`s drawing of the burst of star formation in BOSS-EUVLG1, which incorporates a lot of younger huge stars, and hardly any mud. Credit: Gabriel Pérez Díaz, SMM (IAC).

It was discovered utilizing observations made with the Gran Telescopio Canarias (GTC), on the Roque de los Muchachos Observatory, (Garafía, La Palma, Canary Islands), and with the ATACAMA Large Millimeter/submillimeter Array (ALMA), in Chile. The discovery was not too long ago revealed within the journal Monthly Notices of the Royal Astronomical Society Letters.

The galaxy, referred to as BOSS-EUVLG1, has a red-shift of two.47. This is a measure of the reddening of the sunshine coming from the galaxy, and can be utilized to search out its distance, the additional away the galaxy, the higher the worth. For BOSS-EUVLG1, the worth of two.47 implies that we’re observing the galaxy when the universe was some 2 thousand million years previous, round 20% of its current age.

The giant values of redshift and luminosity of BOSS-EUVLG1 brought about it to be labeled previoulsy within the BOSS (Baryon Oscillation Spectroscopic Survey) mission as a quasar. However, from the observations made with the OSIRIS and EMIR devices on the GTC, and with the millimeter wave telescope ALMA, the researchers have proven that it’s not a quasar however actually a galaxy with excessive, distinctive properties.

The research revealed that the excessive luminosity of BOSS-EUVLG1 within the ultraviolet and in Lyman-alpha emission is as a result of giant variety of younger, huge stars within the galaxy. This excessive luminosity, nicely above the vary for different galaxies, gave rise to its preliminary identification as a quasar. However, in quasars the excessive luminosity is as a result of exercise across the supermassive black holes of their nuclei, and to not star formation.

“BOSS-EUVLG1 appears to be dominated by a burst of formation of younger, very huge stars, with hardly any mud, and with a really low metallicity, explains Rui Marques Chaves, a researcher on the CAB, previously a doctoral scholar on the Instituto de Astrofísica de Canarias and the University of La Laguna (ULL), and first creator of the article.

The charge of star formation on this galaxy could be very excessive, round a thousand photo voltaic plenty per 12 months, round a thousand occasions increased than that within the Milky Way, though the galaxy is 30 occasions smaller. “This rate of star formation is comparable only to the most luminous infrared galaxies known, but the absence of dust in BOSS-EUVLG1 allows its ultraviolet and visible emission to reach us with hardly any attenuation,” explains Ismael Pérez Fournon, an IAC researcher and a co-author of the article.

So, the outcomes of the research recommend that BOSS-EUVLG1 is an instance of the preliminary phases of the formation of huge galaxies. In spite of its excessive luminosity and star formation charge, its low metallicity exhibits that the galaxy has hardly had time to counterpoint its interstellar medium with mud and newly fashioned metals. Nevertheless, “the galaxy will evolve towards a dustier phase, similar to the infrared galaxies, -notes Camilo E. Jiménez Ángel, a doctoral student at the IAC, and a co-author of the article-. Also, its high luminosity in the UV will last only a few hundred million years, a very short period in the evolution of a galaxy.”

“This would explain why other galaxies similar to BOSS-EUVLG1 have not been discovered,” finishes Claudio Dalla Vecchia, a researcher on the IAC, and a co-author of the article.

BOSS-EUVLG1 was found by way of the evaluation of half one million spectra of galaxies and quasars within the BOSS mission of the Sloan Digital Sky Survey (SDSS) and observations with giant telescopes such because the GTC and ALMA.

Reference: “The discovery of the most UV-Ly-alfa luminous star-forming galaxy: a young, dust- and metal-poor starburst with QSO-like luminosities” by R. Marques-Chaves, J. Alvarez-Márquez, L. Colina, I. Pérez-Fournon, D. Schaerer, C. Dalla Vecchia, T. Hashimoto, C. Jiménez-Ángel and Y. Shu, 28 September 2020, Monthly Notices of the Royal Astronomical Society Letters.
arXiv: 2009.02177v1

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