A Comparison of the Stellar, CO, and Dust-continuum Emission from Three Star-forming HUDF Galaxies at z ∼ 2 - Archive ouverte HAL
Article Dans Une Revue The Astrophysical Journal Année : 2020

A Comparison of the Stellar, CO, and Dust-continuum Emission from Three Star-forming HUDF Galaxies at z ∼ 2

Pierre Cox
Melanie Kaasinen
Fabian Walter
Mladen Novak
Marcel Neeleman
Ian Smail
Leindert Boogaard
Elisabete da Cunha
Axel Weiss
Daizhong Liu
Roberto Decarli
Gergö Popping
Tanio Diaz-Santos
Paulo Cortés
Manuel Aravena
Paul van Der Werf
Dominik Riechers
Hanae Inami
Jacqueline A. Hodge
  • Fonction : Auteur
Hans-Walter Rix
Elisabete Da Cunha
Paul van Der Werf
Jacqueline Hodge

Résumé

We compare the extent of the dust, molecular gas and stars in three star-forming galaxies, at $z= 1.4, 1.6$ and $2.7$, selected from the Hubble Ultra Deep Field based on their bright CO and dust-continuum emission as well as their large rest-frame optical sizes. The galaxies have high stellar masses, $\mathrm{M}_*>10^{11}\mathrm{M}_\odot$, and reside on, or slightly below, the main sequence of star-forming galaxies at their respective redshifts. We probe the dust and molecular gas using subarcsecond Atacama Large Millimeter/submillimeter Array observations of the 1.3 mm continuum and CO line emission, respectively, and probe the stellar distribution using \emph{Hubble Space Telescope} observations at 1.6 \textmu m. We find that for all three galaxies the CO emission appears $\gtrsim 30\%$ more compact than the stellar emission. For the $z= 1.4$ and $2.7$ galaxies, the dust emission is also more compact, by $\gtrsim 50\%$, than the stellar emission, whereas for the $z=1.6$ galaxy, the dust and stellar emission have similar spatial extents. This similar spatial extent is consistent with observations of local disk galaxies. However, most high redshift observations show more compact dust emission, likely due to the ubiquity of central starbursts at high redshift and the limited sensitivity of many of these observations. Using the CO emission line, we also investigate the kinematics of the cold interstellar medium in the galaxies, and find that all three have kinematics consistent with a rotation-dominated disk.

Dates et versions

hal-03435563 , version 1 (18-11-2021)

Identifiants

Citer

Pierre Cox, Melanie Kaasinen, Fabian Walter, Mladen Novak, Marcel Neeleman, et al.. A Comparison of the Stellar, CO, and Dust-continuum Emission from Three Star-forming HUDF Galaxies at z ∼ 2. The Astrophysical Journal, 2020, 899 (1), pp.37. ⟨10.3847/1538-4357/aba438⟩. ⟨hal-03435563⟩
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