A global crew of astronomers has investigated an especially luminous infrared galaxy referred to as WISEJ090924.01+000211.1 (or WISEJ0909+0002 for brief) as a part of the eROSITA ﬁnal equatorial depth survey (eFEDS). Outcomes of this examine, revealed April 6 on the arXiv pre-print server, present necessary insights into the properties of this galaxy.
Luminous infrared galaxies (LIRGs) are galaxies emitting extra vitality within the infrared portion of the spectrum, with luminosities above 100 billion photo voltaic luminosities. LIRGs with luminosities exceeding 100 trillion photo voltaic luminosities are referred to as extraordinarily luminous infrared galaxies (ELIRGs).
The infrared luminosity of ELIRGs is assumed to be produced by star formation, lively galactic nucleus (AGN) exercise, or each. Therefore, research of ELIRGs might shed extra gentle on the method of galaxy formation and evolution. They might additionally present extra insights in regards to the connection of those galaxies to their supermassive black holes (SMBHs).
WISEJ0909+0002 was first detected as an ELIRG candidate at a redshift of 1.87 utilizing the eROSITA X-ray instrument onboard the Spektr-RG spacecraft. Just lately, by analyzing knowledge from eFEDS, a crew of astronomers led by Yoshiki Toba of the Kyoto College in Japan has confirmed the ELIRG standing of WISEJ0909+0002 and realized important details about the character of this object. The examine was complemented by archival knowledge from NASA’s Chandra and ESA’s XMM-Newton spacecraft.
The outcomes point out that WISEJ0909+0002 has an infrared luminosity of about 179 trillion photo voltaic luminosities. This was derived from spectral vitality distribution (SED) modeling based mostly on photometric knowledge and confirms that this galaxy is an ELIRG.
In keeping with the paper, WISEJ0909+0002 is a really luminous unobscured type-1 lively galactic nucleus (AGN). The photon index, hydrogen column density, and absorption-corrected onerous X-ray luminosity in the remaining body 2–10 keV have been discovered to be 1.73, lower than 21.0, and roughly 2.1 quattuordecillion erg/s. These values are typical for luminous unobscured type-1 AGNs.
The astronomers famous that the comparatively low hydrogen column density of WISEJ0909+0002 is stunning given its extraordinary infrared luminosity. It could recommend that this ELIRG is embedded inside a considerable amount of fuel and dirt. All in all, the noticed properties of WISEJ0909+0002 appear to point that we’re witnessing a short-lived ELIRG section in the midst of galactic evolution of this supply.
“A remarkably excessive LIR regardless of very low NH would point out that we’re witnessing a short-lived section by which hydrogen fuel alongside the road of sight is blown outwards, whereas heat and sizzling mud heated by AGNs nonetheless exist,” the researchers concluded.
The examine additionally revealed that WISEJ0909+0002 has a mass of almost 500 billion photo voltaic plenty, whereas the mass of its supermassive black gap is estimated to be at a stage of some 7.four billion photo voltaic plenty. The star-formation fee of this galaxy was calculated to be round 3,850 photo voltaic plenty per yr.
WISE1013+6112 is among the most luminous infrared galaxies, examine finds
The eROSITA Remaining Equatorial-Depth Survey (eFEDS): An X-ray shiny, extraordinarily luminous infrared galaxy at z = 1.87, arXiv:2104.02462 [astro-ph.GA] arxiv.org/abs/2104.02462
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Examine explores extraordinarily luminous infrared galaxy WISEJ0909+0002 (2021, April 14)
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