Researchers study extended X-ray emission in the PKS 1718−649 radio source | 4/17/2018 | Staff
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An international team of researchers has performed of extended X-ray emission in the radio source known as PKS 1718−649. The study, published April 11 in a paper on the arXiv pre-print repository, reveals more details about physics of the environment of this source and could be helpful in disclosing its real nature.

PKS 1718−649 is one of the closest and most comprehensively studied gigahertz-peaked radio spectrum (GPS) sources. Although many studies of this source have been conducted, its real nature is still debated. Some researchers classified it as a compact symmetric object (CSO), a small and powerful extragalactic radio source exhibiting emission on both sides of an active galactic nucleus (AGN). On the other hand, some studies suggest that it is an AGN still embedded in its optical host galaxy.

Order - Nature - PKS - Team - Astronomers

In order to investigate the nature of PKS 1718−649, a team of astronomers led by Tobias Beuchert of the University of Amsterdam in the Netherlands has performed a study of an extended X-ray emission from the environment of this source. The research is based on an analysis of observational data obtained by NASA's Chandra X-ray Observatory and ESA's X-ray Multi-Mirror Mission (XMM-Newton).

"In this letter, we investigated the nature of the extended X-ray emitting gas in PKS 1718−649," the researchers wrote in the paper.

Study - Gas - X-rays - Part - Medium

According to the study, this gas primarily emits in soft X-rays and is most likely part of the extended, hot interstellar medium. In particular, the researchers found that besides a photo-ionized gas phase on subparsec scales, the bulk of the soft X-rays is emitted by diffuse, hot (with a temperature of almost 10 million K), and collisionally ionized gas that dominates the nuclear emission on kiloparsec scales.

The astronomers attempt to determine the most plausible scenario to explain this extended X-ray emission in PKS 1718−649. They assume that supernovae are most...
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