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An international team of astronomers reports the discovery of a new hyperluminous quasar. The newfound quasar, which received the designation eFEDSJ0828\u20130139, has a high star-formation rate and its black hole is accreting mass at a super-Eddington rate. The discovery was detailed in a research paper published August 16 on the preprint server arXiv<\/i>.<\/p>\n
Quasars, or quasi-stellar objects (QSOs), are active galactic nuclei (AGN) of very high luminosity powered by supermassive black holes (SMBHs), emitting electromagnetic radiation observable in radio, infrared, visible, ultraviolet and X-ray wavelengths. They are among the brightest and most distant objects in the known universe, and serve as fundamental tools for numerous studies in astrophysics as well as cosmology.<\/p>\n
Now, a group of astronomers led by Yoshiki Toba of the National Astronomical Observatory of Japan (NAOJ) has detected a new quasar with a bolometric luminosity of more than 290 quattuordecillion erg\/s. The quasar was first identified by the eROSITA instrument onboard the Spektr-RG spacecraft and its nature was confirmed by Toba’s team with the Seimei Telescope and the James Clerk Maxwell Telescope (JCMT).<\/p>\n
“We performed the optical spectroscopic observations with KOOLS-IFU on the Seimei Telescope (…) To measure the precise infrared luminosity (LIR), we obtain submillimeter data taken by SCUBA-2 on JCMT and conduct the spectral energy distribution analysis with X-ray to submillimeter data,” the researchers explained.<\/p>\n
According to the paper, the newfound hyperluminous quasar eFEDSJ0828\u20130139 has a spectroscopic redshift of 1.62. The mass of the SMBH in this quasar was found to be approximately 620 million solar masses.<\/p>\n
The study found that eFEDSJ0828\u20130139 has a very high infrared luminosity\u2014at a level of 68 trillion solar luminosities and its Eddington ratio is 3.6. This confirms that eFEDSJ0828\u20130139 is a hyperluminous quasar with a very high black hole mass accretion rate.<\/p>\n
The results indicate that eFEDSJ0828\u20130139 also has an extremely high star-formation rate (SFR). The astronomers calculated that the SFR of this quasar is at least 1,000 solar masses per year.<\/p>\n
Summing up the findings, the authors of the paper noted that eFEDSJ0828\u22120139 is likely in a particular phase in which SMBH and its host galaxy are actively growing in the framework of galaxy-SMBH co-evolution.<\/p>\n
“We may be witnessing the growing phase of both SMBH and its host galaxy in the course of the galaxy\u2013SMBH coevolution, as expected by the numerical simulation,” the researchers concluded.<\/p>\n
The astronomers added that their discovery proves that many more hyperluminous quasars could be detected with the eROSITA all-sky survey and follow-up observations using next-generation multi-object spectrographs, such as the Subaru Prime Focus Spectrograph (PFS).<\/p>\n
More information:<\/strong> \n\t\t\t\t\t\t\t\t\t\t\t\t\tJournal information:<\/strong> \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\tYoshiki Toba et al, Discovery of a hyperluminous quasar at z = 1.62 with Eddington ratio > 3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope, arXiv<\/i> (2024). DOI: 10.48550\/arxiv.2408.08498<\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tarXiv<\/cite><\/p>\n