Large supernova remnant detected by eROSITA

Large supernova remnant detected by eROSITA
Hoinga SNR as seen within the eROSITA all-sky survey eRASS1. Credit score: Becker et al., 2021.

Utilizing the prolonged Röntgen Survey Imaging Telescope Array (eROSITA) instrument onboard the Spektr-RG spacecraft, astronomers have detected in X-rays a brand new massive supernova remnant (SNR). The newfound object, dubbed “Hoinga,” seems to be one of many largest SNR found at wavelengths apart from radio. The discovering is reported in a paper printed February 26 on the arXiv pre-print server.


SNRs are diffuse, increasing buildings ensuing from a supernova explosion. They comprise ejected materials increasing from the explosion and different interstellar materials that has been swept up by the passage of the shockwave from the exploded .

Research of supernova remnants are necessary for astronomers as they play a key position within the evolution of galaxies, dispersing the made within the supernova explosion and offering the vitality wanted for heating up the interstellar medium (ISM). SNRs are additionally believed to be answerable for the acceleration of galactic cosmic rays.

Researchers assume that our Manner galaxy hosts about 1,200 SNRs; nevertheless, solely 300 of them have been recognized to date, largely by radio surveys. Some tasks, just like the eROSITA All-Sky Survey (eRASS), can be utilized to detect new SNRs in X-rays, and lately, a workforce of astronomers led by Werner Becker of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, has reported such discovering.

“Utilizing knowledge from the first SRG/eROSITA observatory all- we found one of many largest SNRs within the sky,” the astronomers wrote within the paper.

The newly discovered SNR, designated G249.5+24.5, was named Hoinga—it’s the medieval of Becker’s hometown Unhealthy Hönningen am Rhein. The observations present that Hoinga has a diameter of about 4.4,” subsequently, it’s practically the most important SNR ever detected at radio wavelengths and comparable in dimension to the most important detected object of this sort, G65.3+5.7.

Hoinga showcases a circular-shaped morphology with a diffuse X-ray emission filling virtually the complete remnant. It has a transparent shell construction, suggesting that it’s a traditional shell-type SNR, not centrally powered. The researchers famous that its extremely round nature signifies that it’s increasing right into a of comparatively uniform density.

Primarily based on the info, the astronomers estimated that Hoinga has a fuel temperature of about 0.1 keV and an absorbing column density of some 360 quintillion cm−2. The radio spectral index was discovered to be at a degree of -0.69, and the gap to the remnant was calculated to be most certainly 1,600 gentle years. The age of this SNR is assumed to be between 21,000 and 150,000 years.

“From its dimension and X-ray and radio spectral properties, we conclude that Hoinga is a middle-aged Vela-like SNR positioned at a distance of about twice that of the Vela SNR, i.e. at ∼500 computer,” the authors of the paper concluded.


Hoinga: Debris of stellar explosion found in unexpected location


Extra info:
Hoinga: A supernova remnant found within the SRG/eROSITA All-Sky Survey eRASS1, arXiv:2102.13449 [astro-ph.HE] arxiv.org/abs/2102.13449

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