===== On the Detection of Main Metal Chalcogenides in Space ===== M. Rey-Montejo, I. Jiménez-Serra, J. Martín-Pintado, V. M. Rivilla, A. Megías, D. San Andrés, M. Sanz-Novo, L. Colzi, S. Zeng, Á. López-Gallifa, A. Martínez-Henares, S. Martín, B. Tercero, P. de Vicente6, and M. Requena-Torres\\ announced the\\ **[[https://doi.org/10.3847/1538-4357/ad736e|Discovery of MgS and NaS in the Interstellar Medium and Tentative Detection of CaO]]**\\ //Astrophys. J.// **975**, Art. No. 174 (2024).\\ The search for metal-containing molecules was carried out in two molecular line surveys of the Galactic Center molecular cloud G+0.693–0.027 employing the Yebes 40 m and IRAM 30 m radio telecopes. Three of 12 covered transitions of MgS with 9 ≤ //J// ≤ 15 are essentially unblended, but more or less parts of more extended emission features. The //J// = 2 − 1 transition near 32.03 GHz is somewhat blended. Five of 9 transitions of NaS with 4.5 ≤ //J// ≤ 11.5 are not blended with features of known species, but except maybe one part of more extended emission features. These two molecules were deemed to be detected. Only two transition of CaO were not blended with lines by known species, but were in both cases parts of more extended emission features. This molecule was deemed to be tentatively detected.\\ \\ A. Tasa-Chaveli, Á. Sánchez-Monge, A. Fuente, A. Ginsburg, H. S. P. Müller, T. Möller, P. Rivière-Marichalar, D. Navarro-Almaida, G. Esplugues, P. Schilke, M. Rodríguez-Baras, S. Thorwirth, and L. Beitia-Antero\\ reported on\\ **[[https://doi.org/10.3847/2041-8213/ae0e6b|A Quest for Sulfur-bearing Refractory Species: Identification of CaS in the Interstellar Medium]]**\\ //Astrophys. J. Lett.// **993**, Art. No. L42 (2025).\\ Four transitions with //J// = 19 − 18 or 18 − 17 and //v// = 0 or 1 were observed with ALMA toward the G351.77-mm1 protostellar disk. Three lines are blended, but the one with //J// = 19 − 18 and //v// = 0 at 200.714 GHz is partially clear and the //J// = 18 − 17 and //v// = 1 at 189.261 GHz apparently helps to constrain //T//rot and the column density. //J// = 22 − 21, //v// = 0, at 232.372 GHz was covered by archival ALMA data, and the high-resolution recording suggests this line dominates at least part of the emission feature. The same extent as NaCl and the value of //T//rot can be viewed in support of the assignment to CaS. Slight caution may be advised nevertheless until further lines will have been detected. \\ Please note that the **[[https://cdms.astro.uni-koeln.de/classic/molecules:ism:AlO|detection of AlO]]** is documented separately.\\ \\ ---- Contributor(s): H. S. P. Müller; 11, 2024; 11, 2025 ----