[astro-ph.GA] Astrochemistry is living a golden age, with more than a quarter of the ~350 molecules in the current interstellar census having been detected over the last three years. One of the sources driving this progress is the G+0.693-0.027 cloud, located in the northern part of the Galactic Centre Sgr B2 complex.
In this contribution, we present the astrochemical characterisation of G+0.633-0.0604, a newly discovered chemically rich molecular cloud at the southern edge of Sgr B2.
With an inventory of >120 species, G+0.633 provides robust second detections of several prebiotic molecules only reported towards G+0.693, establishing it as the first confirmed astrochemical twin of G+0.693 while demonstrating that the extraordinary chemistry of this cloud is not unique.
Furthermore, G+0.633 offers an observational advantage over G+0.693 since it displays half narrower linewidths. Together, G+0.633 and G+0.693 form a unique benchmark pair for unveiling molecular complexity and prebiotic chemistry in the interstellar medium.
D. San Andrés (1), L. Colzi (1), V. M. Rivilla (1), M. Sanz-Novo (2), S. Martín (3 and 4), I. Jiménez-Serra (1), S. Zeng (5) ((1) Centro de Astrobiología (CAB), CSIC-INTA, Torrejón de Ardoz, Madrid, Spain, (2) Center for Astrochemical Studies, Max-Planck-Institute für extraterrestrische Physik, Garching bei Munchen, Germany, (3) European Southern Observatory, Vitacura, Santiago, Chile, (4) Joint ALMA Observatory, Vitacura, Santiago, Chile, (5) Star and Planet Formation Laboratory, Pioneering Research Institute (PRI), RIKEN, Hirosawa, Wako, Saitama, Japan)
Comments: 5 pages, 2 figures. Proceedings for the IAU Symposium 405 “Traversing the Galactic Center in Space and Time”
Subjects: Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2608.14381 [astro-ph.GA] (or arXiv:2608.14381v1 [astro-ph.GA] for this version)
https://doi.org/10.48550/arXiv.2608.14381
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Submission history
From: David San Andrés
[v1] Fri, 14 Aug 2026 15:20:57 UTC (1,531 KB)
https://arxiv.org/abs/2608.14381
Astrobiology, Astrochemistry,
