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The Planck Dusty Gravitationally Enhanced subMillimeter Sources (GEMS)

Abstract : The brightest, strongly lensed high-redshift galaxies are veritable gems to study intense star formation in the early Universe. How do the high and irregular "clumpy" stellar and gas mass surface densities, strong radiation fields, and high turbulence regulate the rapid growth of these galaxies? We will use HST/WFC3 to investigate the stellar component of 6 of the brightest high-redshift sub-millimeter galaxies on the sky, which were recently discovered with the Planck all-sky survey. All are giant arcs or partial Einstein rings with angular sizes up to 17" in shallow CFHT K-band or Spitzer/IRAC imaging. FIR luminosities are 10^13-14 L_sun, with dust SEDs strongly dominated by intense star formation near the maximum possible rates ("maximal starbursts"). All have spectroscopic redshifts z=2.2-3.6 and magnification factors >/=20. We already have multiwavelength data sets to characterize their gas and dust column densities and kinematics, and propose here to acquire deep, high-resolution rest-frame optical imaging to study the stellar populations and morphologies. With WFC3 imaging in F110W & F160W we will:

(1) constrain the stellar morphologies, ages, and mass-to-light ratios

(2) Identify clumps and measure their properties to test several clump formation scenarios

(3) Enhance our on-going lens modeling through the most accurate positions, morphologies and colors

Only the brightest of the arc clumps are visible from the ground in the NIR. To register the flux along the full extent of the arcs, and importantly to probe individual star forming regions of the size of 30 Dor at z~2-3 in the brightest high-z sub-mm galaxies requires HST.

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https://hal-insu.archives-ouvertes.fr/insu-03580791
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Submitted on : Friday, February 18, 2022 - 5:19:26 PM
Last modification on : Sunday, February 20, 2022 - 3:32:46 AM

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Brenda Louise Frye, Alexandre Beelen, Matthieu Bethermin, Raoul Canameras, Herve Dole, et al.. The Planck Dusty Gravitationally Enhanced subMillimeter Sources (GEMS). 2015, pp.14223. ⟨insu-03580791⟩

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