Search: id:"swepub:oai:DiVA.org:kth-221010" >
ALMA Reveals Metals...
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
Part of subdatabase
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
Internet link
Find in a library
To the university's database
- By the author/editor
-
Matthee, J.
-
Sobral, D.
-
Boone, F.
-
Rottgering, H.
-
Schaerer, D.
-
Girard, M.
-
show more...
-
Pallottini, A.
-
Vallini, Livia
-
Ferrara, A.
-
Darvish, B.
-
Mobasher, B.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Royal Institute of Technology
-
Stockholm University