Near infrared monitoring spectra of a sub-sample of quasars reported in this article (sorted by increasing the lag to red). Credit: arxiv (2025). DOI: 10.48550 / Arxiv. 2005.15923
An international team of astronomers discovered 25 new quasars by analyzing multiple wave wave data from various surveys. All the new quasars have been detected at reddress over 4.6. The results are detailed in a research document published on May 21 on the arxiv pre-print server.
The quasars, or quasi-structure objects (QSO), are active galactic nuclei (AGN) in the centers of active galaxies, which have a very high light and are powered by supermassive black holes (SMBHS). They emit an electromagnetic radiation observable in the radio, the infrared wavelengths, visible, ultraviolet and X -rays.
Finding new quasars with high red to red (to red -haired offsets greater than 4.4) is important for astronomers as such QSOS are the brightest and most distant compact objects in the observable universe. Their spectra can be used to estimate the mass of supermassive black holes which force the models of evolution and formation of quasars.
Now, a group of astronomers led by Silvia Belladitdetta of the Max Planck Institute for Astronomy in Heidelberg, Germany, has discovered 25 other quasars of high shift, considerably widening the list of QSO known of this type.
“To extend the sample of quasars with high red to red, we carried out targeted selections using optical, infrared and radio surveys, supplemented by catalogs of quasar candidates based on literature,” explained the researchers.
According to the newspaper, the 25 new quasars have red offsets ranging from 4.6 to 6.9. The majority of new QSOs are located in the southern hemisphere.
Three of the quasars reported in the study, designated MQC J021 + 19, MQC J133-02 and PSO J200 –13, are radio-luxueux because they show an intense radio program, with a brightness of 1.4 GHz in the range of 0.9–10 December Erg / S / Hz.
The study revealed that the three quasars radio-luougnants are compact at all frequencies to the resolution of available radio images. Their radio properties have proven to be in the beach of the values of the other Radio-Radio quasars known in Redshift greater than 4.6.
Astronomers noted that the Quasar Radio-Loud PSO J200-is probably a Blazar because it has typical properties of this subclass of Quasars, such as the flat radio spectrum and variability at several radio frequencies at different time ladders.
In addition, the authors of the article revealed that one of the newly discovered QSOs, namely PSO J041 + 06, is a rare low (WLQ) emission quasar. In general, WLQs are enigmatic objects, which have abnormally weak or weak broad emissions compared to typical quasars, and their nature is still unknown.
In the final remarks, the researchers highlighted the importance of the reanalysis of the data available in the search for new Quasars. “The discovery and characterization of the quasars reported in this article come from the in-depth exploration of the surveys already widely used in recent years, confirming that these data sets can always be exploited for the discovery of quasars in the luminous tail of their brightness function,” they said.
More information:
Silvia Belladitditta et al, discovery and characterization of 25 new quasars at 4.6 arxiv (2025). DOI: 10.48550 / Arxiv. 2005.15923
Newspaper information:
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