Resolved UV and [C II] Structures of Luminous Galaxies within the Epoch of Reionization

Matthee, J. and Sobral, D. and Boogaard, L. A. and Röttgering, H. and Vallini, L. and Ferrara, A. and Paulino-Afonso, A. and Boone, F. and Schaerer, D. and Mobasher, B. (2019) Resolved UV and [C II] Structures of Luminous Galaxies within the Epoch of Reionization. The Astrophysical Journal, 881 (2). ISSN 0004-637X

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Abstract

We present new deep ALMA and HST/WFC3 observations of MASOSA and VR7, two luminous Ly$\alpha$ emitters (LAEs) at $z=6.5$, for which the UV continuum level differ by a factor four. No IR dust continuum emission is detected in either, indicating little amounts of obscured star formation and/or high dust temperatures. MASOSA, with a UV luminosity M$_{1500}=-20.9$, compact size and very high Ly$\alpha$ EW$_{0}\approx145$ A, is undetected in [CII] to a limit of L$_{\rm [CII]}