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  • Caputi, K. I.Köpenhamns universitet,University of Copenhagen,Rijksuniversiteit Groningen,University of Groningen (author)

ALMA Lensing Cluster Survey: An ALMA Galaxy Signposting a MUSE Galaxy Group at z=4.3 Behind "El Gordo"

  • Article/chapterEnglish2021

Publisher, publication year, extent ...

  • 2021-02-19
  • American Astronomical Society,2021

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:635714ac-b36f-4b6b-90cd-392fc2c6d44d
  • https://research.chalmers.se/publication/522626URI
  • https://doi.org/10.3847/1538-4357/abd4d0DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • We report the discovery of a Multi Unit Spectroscopic Explorer (MUSE) galaxy group at z = 4.32 lensed by the massive galaxy cluster ACT-CL J0102-4915 (aka El Gordo) at z = 0.87, associated with a 1.2 mm source that is at a 2.07 0.88 kpc projected distance from one of the group galaxies. Three images of the whole system appear in the image plane. The 1.2 mm source has been detected within the Atacama Large Millimetre/submillimetre Array (ALMA) Lensing Cluster Survey (ALCS). As this ALMA source is undetected at wavelengths lambda < 2 mu m, its redshift cannot be independently determined, however, the three lensing components indicate that it belongs to the same galaxy group at z = 4.32. The four members of the MUSE galaxy group have low to intermediate stellar masses (similar to 10(7)-10(10) M) and star formation rates (SFRs) of 0.4-24 M yr(-1), resulting in high specific SFRs (sSFRs) for two of them, which suggest that these galaxies are growing fast (with stellar mass doubling times of only similar to 2 x 10(7) yr). This high incidence of starburst galaxies is likely a consequence of interactions within the galaxy group, which is compact and has high velocity dispersion. Based on the magnification-corrected sub-/millimeter continuum flux density and estimated stellar mass, we infer that the ALMA source is classified as an ordinary ultra-luminous infrared galaxy (with associated dust-obscured SFR similar to 200-300 M yr(-1)) and lies on the star formation main sequence. This reported case of an ALMA/MUSE group association suggests that some presumably isolated ALMA sources are in fact signposts of richer star-forming environments at high redshifts.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Caminha, G. B.Rijksuniversiteit Groningen,University of Groningen (author)
  • Fujimoto, S.Köpenhamns universitet,University of Copenhagen (author)
  • Kohno, K.University of Tokyo, Japan (author)
  • Sun, F.University of Arizona (author)
  • Egami, E.University of Arizona (author)
  • Deshmukh, S.Rijksuniversiteit Groningen,University of Groningen (author)
  • Tang, F.Rijksuniversiteit Groningen,University of Groningen (author)
  • Ao, Y.University of Science and Technology of China,Chinese Academy of Sciences (author)
  • Bradley, L.Space Telescope Science Institute (STScI) (author)
  • Coe, D.Space Telescope Science Institute (STScI) (author)
  • Espada, D.SKA Organisation (author)
  • Grillo, C.Istituto nazionale di astrofisica (INAF),Universita' degli Studi di Milano,University of Milan,Köpenhamns universitet,University of Copenhagen (author)
  • Hatsukade, B.University of Tokyo, Japan (author)
  • Knudsen, Kirsten Kraiberg,1976Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)kraiberg (author)
  • Lee, M. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Magdis, G. E.Köpenhamns universitet,University of Copenhagen,Danmarks Tekniske Universitet,Technical University of Denmark (author)
  • Morokuma-Matsui, K.University of Tokyo, Japan (author)
  • Oesch, P.Université de Genève,University of Geneva (author)
  • Ouchi, M.University of Tokyo, Japan,National Astronomical Observatory of Japan (author)
  • Rosati, P.University of Ferrara,Istituto nazionale di astrofisica (INAF) (author)
  • Umehata, H.University of Tokyo, Japan,RIKEN (author)
  • Valentino, F.Köpenhamns universitet,University of Copenhagen (author)
  • Vanzella, E.Istituto nazionale di astrofisica (INAF) (author)
  • Wang, W. -H.Academia Sinica Taiwan (author)
  • Wu, J. F.Space Telescope Science Institute (STScI) (author)
  • Zitrin, A.Ben-Gurion University of the Negev (author)
  • Köpenhamns universitetRijksuniversiteit Groningen (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: American Astronomical Society908:21538-43570004-637X

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