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27 April 2024 |
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An Intensely Star-Forming Galaxy at z~7 with Low Dust and Metal Content Revealed by Deep ALMA and HST Observations | | Masami Ouchi
; Richard Ellis
; Yoshiaki Ono
; Kouichiro Nakanishi
; Kotaro Kohno
; Rieko Momose
; Yasutaka Kurono
; M. L. N. Ashby
; Kazuhiro Shimasaku
; S. P. Willner
; G. G. Fazio
; Yoichi Tamura
; Daisuke Iono
; | | Date: |
15 Jun 2013 | | Abstract: | We report deep ALMA observations complemented with associated HST imaging for
a luminous (m_uv=25) galaxy, ’Himiko’, at a redshift z=6.595. The galaxy is
remarkable for its high star formation rate, 100 Mo/yr, securely estimated from
our deep HST and Spitzer photometry, and the absence of any evidence for strong
AGN activity or gravitational lensing magnification. Our ALMA observations
probe an order of magnitude deeper than previous IRAM observations, yet fail to
detect a 1.2mm dust continuum, indicating a flux <52uJy comparable with or
weaker than that of local dwarf irregulars with much lower star formation
rates. We likewise provide a strong upper limit for the flux of [CII] 158um,
L([CII]) < 5.1x10^7 Lo, a diagnostic of the hot interstellar gas often
described as a valuable probe for early galaxies. In fact, our observations
indicate Himiko lies off the local L([CII]) - star formation rate scaling
relation by a factor of more than 30. Both aspects of our ALMA observations
suggest Himiko is an unique object with a very low dust content and perhaps
nearly primordial interstellar gas. Our HST images provide unique insight into
the morphology of this remarkable source, highlighting an extremely blue core
of activity and two less extreme associated clumps. We are likely witnessing an
early massive galaxy during a key period of its mass assembly close to the end
of the reionization era. Himiko is undergoing a triple major merger event whose
extensive ionized nebula of Lyman alpha emitting gas, discovered in our earlier
work with Subaru, is powered by star formation and the dense circum-galactic
gas. | | Source: | arXiv, 1306.3572 | | Services: | Forum | Review | PDF | Favorites | |
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