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Farthest Radio Loud Quasar Discovered

Optical / near infrared spectrum of P172 +18. Credits: Bañadosetal. , 2021.

In a recent study, an international team of astronomers announced the discovery of PSO J172.3556 + 18.7734. This is a highly accreting radio loud quasar with a redshift of about 6.82. This is the farthest radio loud quasar ever known. The findings are detailed in a paper published on arXiv.org on March 4th.


A quasar, or substellar object (QSO), is a very bright active galactic nucleus (AGN) containing a supermassive black hole with an accretion disk. Their redshifts are measured from the strong spectral lines that dominate their visible and UV spectra.

Astronomers are particularly interested in finding new high redshift quasars (with redshifts higher than 5.0) because they are the brightest and farthest compact objects in the observable universe. Such QSO spectra can be used to estimate the mass of supermassive black holes that constrain quasar evolution and formation models. Therefore, high-red shift quasars can serve as a powerful tool for scrutinizing the early universe.

A group of astronomers, now led by Eduardo Banados of the Max Planck Institute for Astronomy in Heidelberg, Germany, reports the discovery of another high-red shift quasar, PSO J172.3556 + 18.7734 (or P172 + 18 for short). I am.

“On January 12, 2019, the Magellan Clay Telescope at Las Campanas Observatory confirmed P172 + 18 as an az to 6.8 quasar in a 450-second spectrum using a prism-mode Foldedport InfraRed Echellete (FIRE) spectrometer.” The researchers explained.

P172 + 18 was identified with a redshift of 6.823. This makes it the farthest radio loud source ever found. So far, only three radio loud sources have been reported with a redshift greater than 6.0, the farthest being a redshift quasar of about 6.18.

According to the treatise, the P172 + 18 black hole has a mass of about 290 million solar masses and an Eddington ratio of about 2.2. By comparing P172 + 18 with similar objects, researchers found that the newly discovered source was one of the fastest accreting quasars in both low and high redshifts. did.

P172 + 18 was found to have a large ionized intergalactic medium around what suggests that the object lifetime exceeds the average lifetime high redshift quasar with a redshift greater than 6.0. .. In addition, the study found that the P172 + 18 radio spectrum from 1.4 to 3.0 GHz was steep, and that the quasar had radio loudness parameters at about 91 levels.

To summarize the results, scientists pointed out that P172 + 18 is an interesting target for further observations.

“Especially P172 + 18 is an ideal target for investigating the presence of extended X-ray radiation resulting from the interaction of relativistic particles in radio jets with cosmic microwave background (CMB). This effect. Is expected to be particularly strong. The CMB energy density is scaled as (1 + z), so at the highest red shift.Four As a result, its effective magnetic field can be stronger than the magnetic field of the radio lobe, “concludes the author of the paper.


The farthest quasar where a powerful radio jet was discovered


For more information:
z = 6.82, arXiv: Discovery of a highly accreting radio loud quasar at 2103.03295 [astro-ph.CO] arxiv.org/abs/2103.03295

© 2021 Science X Network

Quote: The farthest radio loud quasar found (March 15, 2021) is from https: //phys.org/news/2021-03-distant-radio-loud-quasar.html on March 15, 2021. Obtained.

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Farthest Radio Loud Quasar Discovered

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