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  • Matthee, J. (author)

ALMA Reveals Metals yet No Dust within Multiple Components in CR7

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • 2017-12-21
  • Institute of Physics Publishing (IOPP),2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-221010
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-221010URI
  • https://doi.org/10.3847/1538-4357/aa9931DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-151204URI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

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

Notes

  • QC 20180115
  • We present spectroscopic follow-up observations of CR7 with ALMA, targeted at constraining the infrared (IR) continuum and [C II](158 mu m) line-emission at high spatial resolution matched to the HST/WFC3 imaging. CR7 is a luminous Ly alpha emitting galaxy at z = 6.6 that consists of three separated UV-continuum components. Our observations reveal several well-separated components of [C II] emission. The two most luminous components in [C II] coincide with the brightest UV components (A and B), blueshifted by approximate to 150 km s(-1) with respect to the peak of Lya emission. Other [C II] components are observed close to UV clumps B and C and are blueshifted by approximate to 300 and approximate to 80 km s(-1) with respect to the systemic redshift. We do not detect FIR continuum emission due to dust with a 3 sigma limiting luminosity L-IR(T-d = 35 K) < 3.1 x 10(10) L-circle dot. This allows us to mitigate uncertainties in the dust-corrected SFR and derive SFRs for the three UV clumps A, B, and C of 28, 5, and 7 M-circle dot yr(-1). All clumps have [C II] luminosities consistent within the scatter observed in the local relation between SFR and L[C II], implying that strong Ly alpha emission does not necessarily anti-correlate with [C II] luminosity. Combining our measurements with the literature, we show that galaxies with blue UV slopes have weaker [C II] emission at fixed SFR, potentially due to their lower metallicities and/or higher photoionization. Comparison with hydrodynamical simulations suggests that CR7's clumps have metallicities of 0.1 < Z/Z(circle dot) < 0.2. The observed ISM structure of CR7 indicates that we are likely witnessing the build up of a central galaxy in the early universe through complex accretion of satellites.

Subject headings and genre

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

  • Sobral, D. (author)
  • Boone, F. (author)
  • Rottgering, H. (author)
  • Schaerer, D. (author)
  • Girard, M. (author)
  • Pallottini, A. (author)
  • Vallini, LiviaStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Stockholms universitet, Sverige; Nordita SU(Swepub:su)lvall (author)
  • Ferrara, A. (author)
  • Darvish, B. (author)
  • Mobasher, B. (author)
  • Stockholms universitetNordiska institutet för teoretisk fysik (Nordita) (creator_code:org_t)

Related titles

  • In:Astrophysical Journal: Institute of Physics Publishing (IOPP)851:20004-637X1538-4357

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