An imperfectly passive nature: Bright sub-millimeter emission from dust-obscured star formation in the z=3.717 'passive' system, ZF20115
| Autor: | James E. Geach, Chen-Fatt Lim, Helmut Dannerbauer, Christopher Harrison, Wei-Hao Wang, Yoshiki Toba, Rob Ivison, James Dunlop, Dominik Riechers, Chian-Chou Chen, Y. Ao, Andrew Bunker, Minju Lee, Ian Smail, X. Z. Zheng, Julian M Simpson, David J. Rosario, Ho Seong Hwang, Tadayuki Kodama, T. Goto, H. Shim, Ho-Gyu Lee, Michał J. Michałowski, Scott Chapman, Chien-Hsiu Lee, A. M. Swinbank, Elisabetta Valiante, X. W. Shu, Junxian Wang, N. Bourne, Wei-Leong Tee |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Stellar mass
FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Photometry (optics) symbols.namesake 0103 physical sciences Galaxy formation and evolution Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics starburst [galaxies] 010308 nuclear & particles physics Star formation Balmer series Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) symbols Millimeter Astrophysics::Earth and Planetary Astrophysics high-redshift [galaxies] |
| Zdroj: | Astrophysical journal letters, 2017, Vol.844(1), pp.L10 [Peer Reviewed Journal] Simpson, J M, Smail, I, Wang, W H, Riechers, D, Dunlop, J S, Ao, Y, Bourne, N, Bunker, A, Chapman, S C, Chen, C C, Dannerbauer, H, Geach, J E, Goto, T, Harrison, C M, Hwang, H S, Ivison, R J, Kodama, T, Lee, C H, Lee, H M, Lee, M, Lim, C F, Michałowski, M J, Rosario, D J, Shim, H, Shu, X W, Swinbank, A M, Tee, W L, Toba, Y, Valiante, E, Wang, J & Zheng, X Z 2017, ' An Imperfectly Passive Nature : Bright Submillimeter Emission from Dust-obscured Star Formation in the z = 3.717 "passive" System, ZF 20115 ', Astrophysical Journal Letters, vol. 844, no. 1, L10 . https://doi.org/10.3847/2041-8213/aa7cf2 |
| ISSN: | 2041-8213 |
| DOI: | 10.3847/2041-8213/aa7cf2 |
| Popis: | The identification of high-redshift massive galaxies with old stellar populations may pose challenges to some models of galaxy formation. However, to securely classify a galaxy as quiescent, it is necessary to exclude significant ongoing star formation, something that can be challenging to achieve at high redshift. In this letter, we analyse deep ALMA/870um and SCUBA-2/450um imaging of the claimed "post-starburst" galaxy ZF-20115 at z=3.717 that exhibits a strong Balmer break and absorption lines. The far-infrared imaging reveals a luminous starburst located 0.4+/-0.1 arcsec (~3kpc in projection) from the position of the rest-frame ultra-violet/optical emission, with an obscured star-formation rate of 100 Mo/yr. This star-forming component is undetected in the rest-frame ultraviolet but contributes significantly to the lower angular resolution photometry at restframe wavelengths >3500A, significantly complicating the determination of a reliable stellar mass. Importantly, in the presence of dust obscuration, strong Balmer features are not a unique signature of a post-starburst galaxy and are indeed frequently observed in infrared-luminous galaxies. We conclude that the ZF20015 system does not pose a challenge to current models of galaxy formation and that deep sub-/millimeter observations are a prerequisite for any claims of quiescence. The multi-wavelength observations of ZF20115 unveil a complex system with an intricate and spatially-varying star-formation history. ZF20115 demonstrates that understanding high-redshift obscured starbursts will only be possible with multi-wavelength studies that include high-resolution observations, available with the JWST, at mid-infrared wavelengths. ApJ submitted. Comments welcome |
| Databáze: | OpenAIRE |
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