Extended ionised and clumpy gas in a normal galaxy at z=7.1 revealed by ALMA

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Extended ionised and clumpy gas in a normal galaxy at z=7.1 revealed by ALMA

Carniani, S. (författare): Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England.

Maiolino, R. (författare): Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England.

Pallottini, A. (författare): Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England.;Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.

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Vallini, Livia (författare): Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Nordita SU

Pentericci, L. (författare): INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy.

Ferrara, A. (författare): Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.

Castellano, M. (författare): INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy.

Vanzella, E. (författare): INAF Bologna Astron Observ, Via Ranzani 1, I-40127 Bologna, Italy.

Grazian, A. (författare): INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy.

Gallerani, S. (författare): Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.

Santini, P. (författare): INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy.

Wagg, J. (författare): Sq Kilometre Array Org, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England.

Fontana, A. (författare): INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy.

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Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England. Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England.;Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy. (creator_code:org_t)

2017-09-06
2017
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 605

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://www.aanda.or...; https://urn.kb.se/re...; https://doi.org/10.1...; https://urn.kb.se/re...; visa färre...

Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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We present new ALMA observations of the [O III] 88 mu m line and high angular resolution observations of the [C II] 158 mu m line in a normal star forming galaxy at z = 7.1. Previous [C II] observations of this galaxy had detected [C II] emission consistent with the Ly alpha redshift but spatially slightly off set relative to the optical (UV-rest frame) emission. The new [C II] observations reveal that the [C II] emission is partly clumpy and partly diffuse on scales larger than about 1 kpc. [O III] emission is also detected at high significance, off set relative to the optical counterpart in the same direction as the [C II] clumps, but mostly not overlapping with the bulk of the [C II] emission. The off set between different emission components (optical/UV and different far-IR tracers) is similar to that which is observed in much more powerful starbursts at high redshift. We show that the [O III] emitting clump cannot be explained in terms of diffuse gas excited by the UV radiation emitted by the optical galaxy, but it requires excitation by in-situ (slightly dust obscured) star formation, at a rate of about 7 M circle dot yr(-1). Within 20 kpc from the optical galaxy the ALMA data reveal two additional [O III] emitting systems, which must be star forming companions. We discuss that the complex properties revealed by ALMA in the z similar to 7.1 galaxy are consistent with expectations by recent models and cosmological simulations, in which differential dust extinction, differential excitation and different metal enrichment levels, associated with different subsystems assembling a galaxy, are responsible for the various appearance of the system when observed with distinct tracers.

Ämnesord

NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)

Nyckelord

galaxies: evolution
galaxies: ISM
galaxies: high-redshift
infrared: general

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Av författaren/redakt...: Carniani, S.; Maiolino, R.; Pallottini, A.; Vallini, Livia; Pentericci, L.; Ferrara, A.; visa fler...; Castellano, M.; Vanzella, E.; Grazian, A.; Gallerani, S.; Santini, P.; Wagg, J.; Fontana, A.; visa färre...

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NATURVETENSKAP: NATURVETENSKAP; och Fysik

Artiklar i publikationen: Astronomy and As ...

Av lärosätet: Kungliga Tekniska Högskolan; Stockholms universitet

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