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ALMA Reveals Metals...
ALMA Reveals Metals yet No Dust within Multiple Components in CR7
- Artikel/kapitelEngelska2017
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2017-12-21
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Institute of Physics Publishing (IOPP),2017
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-221010
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-221010URI
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https://doi.org/10.3847/1538-4357/aa9931DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-151204URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20180115
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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.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Sobral, D.
(författare)
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Boone, F.
(författare)
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Rottgering, H.
(författare)
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Schaerer, D.
(författare)
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Girard, M.
(författare)
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Pallottini, A.
(författare)
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Vallini, LiviaStockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Stockholms universitet, Sverige; Nordita SU(Swepub:su)lvall
(författare)
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Ferrara, A.
(författare)
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Darvish, B.
(författare)
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Mobasher, B.
(författare)
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Stockholms universitetNordiska institutet för teoretisk fysik (Nordita)
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Astrophysical Journal: Institute of Physics Publishing (IOPP)851:20004-637X1538-4357
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Till lärosätets databas
- Av författaren/redakt...
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Matthee, J.
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Sobral, D.
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Boone, F.
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Rottgering, H.
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Schaerer, D.
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Girard, M.
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visa fler...
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Pallottini, A.
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Vallini, Livia
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Ferrara, A.
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Darvish, B.
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Mobasher, B.
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