A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE

Vera Patrício; Johan Richard; Anne Verhamme; Lutz Wisotzki; Jarle Brinchmann; Monica L. Turner; Lise Bech Christensen; Peter M. Weilbacher; Jérémy Blaizot; Roland Bacon; Thierry Contini; David Lagattuta; Sebastiano Cantalupo; Benjamin Clément; Geneviève Soucail

doi:10.1093/mnras/stv2859

A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE

Vera Patrício, Johan Richard, Anne Verhamme, Lutz Wisotzki, Jarle Brinchmann, Monica L. Turner, Lise Bech Christensen, Peter M. Weilbacher, Jérémy Blaizot, Roland Bacon, Thierry Contini, David Lagattuta, Sebastiano Cantalupo, Benjamin Clément, Geneviève Soucail

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Abstract

Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L *, M = 6 × 10⁹M_⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (MUSE), for which we obtain 2D resolved spatial information of Lyα and, for the first time, of C III] emission. The exceptional signal-to-noise ratio of the data reveals UV emission and absorption lines rarely seen at these redshifts, allowing us to derive important physical properties (T_e ~ 15600 K, n_e ~ 300 cm^-3, covering fraction fc ~ 0.4) using multiple diagnostics. Inferred stellar and gas-phase metallicities point towards a low-metallicity object (Z_stellar = ~ 0.07 Z⊙ and Z_ISM < 0.16 Z⊙). The Lyα emission extends over ~10 kpc across the galaxy and presents a very uniform spectral profile, showing only a small velocity shift which is unrelated to the intrinsic kinematics of the nebular emission. The Lya extension is approximately four times larger than the continuum emission, and makes this object comparable to low-mass LAEs at low redshift, and more compact than the Lyman-break galaxies and Lyα emitters usually studied at high redshift. We model the Lyα line and surface brightness profile using a radiative transfer code in an expanding gas shell, finding that this model provides a good description of both observables.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astronomical Society
Vol/bind	456
Udgave nummer	4
Sider (fra-til)	4191-4208
ISSN	0035-8711
DOI	https://doi.org/10.1093/mnras/stv2859
Status	Udgivet - 9 jan. 2016

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Patrício, V., Richard, J., Verhamme, A., Wisotzki, L., Brinchmann, J., Turner, M. L., Christensen, L. B., Weilbacher, P. M., Blaizot, J., Bacon, R., Contini, T., Lagattuta, D., Cantalupo, S., Clément, B., & Soucail, G. (2016). A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE. Monthly Notices of the Royal Astronomical Society, 456(4), 4191-4208. https://doi.org/10.1093/mnras/stv2859

Patrício, V, Richard, J, Verhamme, A, Wisotzki, L, Brinchmann, J, Turner, ML, Christensen, LB, Weilbacher, PM, Blaizot, J, Bacon, R, Contini, T, Lagattuta, D, Cantalupo, S, Clément, B & Soucail, G 2016, 'A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE', Monthly Notices of the Royal Astronomical Society, bind 456, nr. 4, s. 4191-4208. https://doi.org/10.1093/mnras/stv2859

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title = "A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE",

abstract = "Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L *, M = 6 × 109M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (MUSE), for which we obtain 2D resolved spatial information of Lyα and, for the first time, of C III] emission. The exceptional signal-to-noise ratio of the data reveals UV emission and absorption lines rarely seen at these redshifts, allowing us to derive important physical properties (Te ~ 15600 K, ne ~ 300 cm-3, covering fraction fc ~ 0.4) using multiple diagnostics. Inferred stellar and gas-phase metallicities point towards a low-metallicity object (Zstellar = ~ 0.07 Z⊙ and ZISM < 0.16 Z⊙). The Lyα emission extends over ~10 kpc across the galaxy and presents a very uniform spectral profile, showing only a small velocity shift which is unrelated to the intrinsic kinematics of the nebular emission. The Lya extension is approximately four times larger than the continuum emission, and makes this object comparable to low-mass LAEs at low redshift, and more compact than the Lyman-break galaxies and Lyα emitters usually studied at high redshift. We model the Lyα line and surface brightness profile using a radiative transfer code in an expanding gas shell, finding that this model provides a good description of both observables.",

keywords = "astro-ph.GA",

author = "Vera Patr{\'i}cio and Johan Richard and Anne Verhamme and Lutz Wisotzki and Jarle Brinchmann and Turner, {Monica L.} and Christensen, {Lise Bech} and Weilbacher, {Peter M.} and J{\'e}r{\'e}my Blaizot and Roland Bacon and Thierry Contini and David Lagattuta and Sebastiano Cantalupo and Benjamin Cl{\'e}ment and Genevi{\`e}ve Soucail",

note = "19 pages, 15 figures, accepted in MNRAS",

year = "2016",

month = jan,

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doi = "10.1093/mnras/stv2859",

language = "English",

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pages = "4191--4208",

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T1 - A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE

AU - Patrício, Vera

AU - Richard, Johan

AU - Verhamme, Anne

AU - Wisotzki, Lutz

AU - Brinchmann, Jarle

AU - Turner, Monica L.

AU - Christensen, Lise Bech

AU - Weilbacher, Peter M.

AU - Blaizot, Jérémy

AU - Bacon, Roland

AU - Contini, Thierry

AU - Lagattuta, David

AU - Cantalupo, Sebastiano

AU - Clément, Benjamin

AU - Soucail, Geneviève

N1 - 19 pages, 15 figures, accepted in MNRAS

PY - 2016/1/9

Y1 - 2016/1/9

N2 - Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L *, M = 6 × 109M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (MUSE), for which we obtain 2D resolved spatial information of Lyα and, for the first time, of C III] emission. The exceptional signal-to-noise ratio of the data reveals UV emission and absorption lines rarely seen at these redshifts, allowing us to derive important physical properties (Te ~ 15600 K, ne ~ 300 cm-3, covering fraction fc ~ 0.4) using multiple diagnostics. Inferred stellar and gas-phase metallicities point towards a low-metallicity object (Zstellar = ~ 0.07 Z⊙ and ZISM < 0.16 Z⊙). The Lyα emission extends over ~10 kpc across the galaxy and presents a very uniform spectral profile, showing only a small velocity shift which is unrelated to the intrinsic kinematics of the nebular emission. The Lya extension is approximately four times larger than the continuum emission, and makes this object comparable to low-mass LAEs at low redshift, and more compact than the Lyman-break galaxies and Lyα emitters usually studied at high redshift. We model the Lyα line and surface brightness profile using a radiative transfer code in an expanding gas shell, finding that this model provides a good description of both observables.

AB - Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L *, M = 6 × 109M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (MUSE), for which we obtain 2D resolved spatial information of Lyα and, for the first time, of C III] emission. The exceptional signal-to-noise ratio of the data reveals UV emission and absorption lines rarely seen at these redshifts, allowing us to derive important physical properties (Te ~ 15600 K, ne ~ 300 cm-3, covering fraction fc ~ 0.4) using multiple diagnostics. Inferred stellar and gas-phase metallicities point towards a low-metallicity object (Zstellar = ~ 0.07 Z⊙ and ZISM < 0.16 Z⊙). The Lyα emission extends over ~10 kpc across the galaxy and presents a very uniform spectral profile, showing only a small velocity shift which is unrelated to the intrinsic kinematics of the nebular emission. The Lya extension is approximately four times larger than the continuum emission, and makes this object comparable to low-mass LAEs at low redshift, and more compact than the Lyman-break galaxies and Lyα emitters usually studied at high redshift. We model the Lyα line and surface brightness profile using a radiative transfer code in an expanding gas shell, finding that this model provides a good description of both observables.

KW - astro-ph.GA

U2 - 10.1093/mnras/stv2859

DO - 10.1093/mnras/stv2859

M3 - Journal article

SN - 0035-8711

VL - 456

SP - 4191

EP - 4208

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 4

ER -

A young star-forming galaxy at z = 3.5 with an extended Ly\,$α$ halo seen with MUSE

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