3MM-1

3MM-1 is a star-forming galaxy about 12.5 billion light-years away that is obscured by clouds of dust.[2] It was first detected in spectroscopic data on rotational transitions of carbon monoxide obtained using the Atacama Large Millimeter Array from 23-24 December 2018, as detailed in an article that was published on 22 October 2019. The authors of this article described the discovery as "serendipitous",[1] since 3MM-1 was found at a redshift of about 5.5, while the focus of their planned observations had been on galaxies at redshifts near 1.5 that are quiescent, i.e. do not form stars, and directly observable.[1][3] In the same dataset, another dust-obscured star-forming galaxy, 3MM-2, was found at a redshift of about 3.3.[1]

3MM-1
Observation data
Right ascension 10h 02m 36.82s[1]
Declination+02° 08′ 40.60″[1]
Redshift5.5+1.2
−1.1[1]
Distance12.5×109 light year[2]
Characteristics
Mass1010.8[2] M☉

3MM-1 has a mass of about 1010.8 solar masses, and stars form in it at about 100 times the rate as in the Milky Way.[2]

References
  1. Williams, Christina C.; Labbe, Ivo; Spilker, Justin; Stefanon, Mauro; Leja, Joel; Whitaker, Katherine; Bezanson, Rachel; Narayanan, Desika; Oesch, Pascal; Weiner, Benjamin (2019). "Discovery of a Dark, Massive, ALMA-only Galaxy at z ∼ 5–6 in a Tiny 3 mm Survey". The Astrophysical Journal. 884 (2): 154. arXiv:1905.11996. doi:10.3847/1538-4357/ab44aa. ISSN 1538-4357.
  2. University of Arizona. "Cosmic Yeti from the Dawn of the Universe Found Lurking in Dust". UANews. Retrieved 2019-10-22.
  3. Bezanson, Rachel; Spilker, Justin; Williams, Christina C.; Whitaker, Katherine E.; Narayanan, Desika; Weiner, Benjamin; Franx, Marijn (2019). "Extremely Low Molecular Gas Content in a Compact, Quiescent Galaxy at z = 1.522". The Astrophysical Journal. 873 (2): L19. doi:10.3847/2041-8213/ab0c9c. hdl:10150/633284. ISSN 2041-8213.


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