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The ALPINE-ALMA [CII] Survey: Size of Individual Star-Forming Galaxies at z=4-6 and their Extended Halo Structure | S. Fujimoto
; J. D. Silverman
; Matthieu Bethermin
; M. Ginolfi
; G. C. Jones
; O. Le Fèvre
; M. Dessauges-Zavadsky
; W. Rujopakarn
; A. L. Faisst
; Y. Fudamoto
; P. Cassata
; L. Morselli
; D. Schaerer
; P. Capak
; L. Yan
; L. Vallini
; S. Toft
; F. Loiacono
; G. Zamorani
; M. Talia
; D. Narayanan
; N. P. Hathi
; B. C. Lemaux
; Médéric Boquien
; R. Amorin
; E. Ibar
; A. M. Koekemoer H. Méndez-Hernández
; Sandro Bardelli
; D. Vergani
; E. Zucca
; M. Romano
; A. Cimatti
; | Date: |
28 Feb 2020 | Abstract: | We present the physical extent of [CII] 158um line-emitting gas from 46
star-forming galaxies at z=4-6 from the ALMA Large Program to INvestigate CII
at Early Times (ALPINE). Using exponential profile fits, we measure the
effective radius of the [CII] line (r_e,[CII]) for individual galaxies and
compare them with the rest-frame ultra-violet (UV) continuum (r_e,UV) from
Hubble Space Telescope images. The effective radius r_e,[CII] almost always
exceeds r_e,UV by factors of ~2-3 and the ratio of r_e,[CII]/r_e,UV increases
as a function of M_star. We do not find strong evidence for a displacement over
~ 1-kpc scale among the [CII] line, the rest-frame UV, and FIR continuum. We
identify 30% of isolated ALPINE sources as having an extended [CII] component
over 10-kpc scales detected at 4.1$sigma$-10.9$sigma$ beyond the size of
rest-frame UV and far-infrared (FIR) continuum. One object has tentative
rotating features up to ~10-kpc, where the 3D model fit shows the rotating
[CII]-gas disk spread over 4 times larger than the rest-frame UV-emitting
region. Galaxies with the extended [CII] line structure have high
star-formation rate (SFR), stellar mass (M_star), low Lya equivalent-width, and
more blue-shifted (red-shifted) rest-frame UV metal absorption (Lya line), as
compared to galaxies without such extended [CII] structures. Although we cannot
rule out the possibility that a selection bias towards luminous objects may be
responsible for such trends, the extended [CII] line structure appears even
around several objects whose SFR and M_star are as small as those without the
extended structure. Deeper observations are essential to test whether the
extended [CII] line structures are ubiquitous to high-z star-forming galaxies. | Source: | arXiv, 2003.0013 | Services: | Forum | Review | PDF | Favorites |
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