The recent identification of a gaseous formation, designated G2t, exhibiting an orbital path virtually congruent with two previously documented nebulae, strongly implies that all three entities originated from the ejection of material by a binary system of colossal stars situated proximate to the heart of our Milky Way Galaxy.
This VLT image portrays the stellar and gaseous constituents encircling Sagittarius A*, a supermassive gravitational entity at the Milky Way Galaxy’s nucleus. Photography courtesy of ESO / D. Ribeiro, MPE GC Team.
“This milieu is extraordinarily dynamic, characterized by celestial bodies and gaseous condensations traversing past the black hole at astonishing velocities,” remarked Dr. Stefan Gillessen from the Max Planck Institute for Extraterrestrial Physics, in conjunction with his collaborators.
“Two such nebulae, G1 and G2, were already acknowledged, yet their true nature and genesis remained subjects of ongoing discourse.”
“Specifically, it was uncertain whether these aggregations concealed an embedded star or were composed exclusively of gaseous matter.”
“Nevertheless, the advent of a third gaseous formation, christened G2t, now significantly contributes to resolving these uncertainties.”
G2t was initially detected through the utilization of the Enhanced Resolution Imager and Spectrograph (ERIS), an instrument integrated with ESO’s Very Large Telescope (VLT).
“The capabilities afforded by the VLT enabled us to precisely quantify the three-dimensional trajectories of these nebulae around the black hole,” the astrophysicists stated.
“These formations traverse an extremely confined region situated at the focal point of this expansive field of vision.”
“It was ascertained that G1, G2, and G2t indeed follow nearly identical orbital paths, differing merely in their rotational orientation relative to one another.”
“This finding effectively negates the hypothesis that each nebula might harbor an individual star within its core, given the exceedingly low probability of disparate stars exhibiting such closely aligned orbital parameters.”
“The striking concordance of their orbital pathways suggests that these three nebulae likely share a common progenitor, most plausibly IRS16SW, a binary system of immense stars responsible for expelling a prodigious quantity of gas.”
“As IRS16SW undertakes its orbital revolution around the black hole, each resultant gas cloud is expelled along a subtly divergent trajectory, thereby accounting for the minor variations observed in the paths of this ‘G-triplet’.”
“This revelation underscores that, despite extensive decades of observation focused on the Galactic center, novel enigmas continue to emerge,” they commented.
“However, what could be more exhilarating than the prospect of unsolved mysteries awaiting elucidation?”
This groundbreaking discovery has been meticulously detailed in a publication featured in the esteemed journal Astronomy & Astrophysics.
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S. Gillessen et al. 2026. The gas streamer G1-2-3 in the Galactic center. A&A 707, A79; doi: 10.1051/0004-6361/202555808
