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题名: An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z=3.717 "Passive" System, ZF 20115
作者: Simpson, J. M.; Smail, Ian; Wang, Wei-Hao; Riechers, D.; Dunlop, J. S.; Ao, Y.; Bourne, N.; Bunker, A.; Chapman, S. C.; Chen, Chian-Chou; Dannerbauer, H.; Geach, J. E.; Goto, T.; Harrison, C. M.; Hwang, H. S.; Ivison, R. J.; Kodama, Tadayuki; Lee, C. -H.; Lee, H. -M.; Lee, M.; Lim, C. -F.; Michalowski, M. J.; Rosario, D. J.; Shim, H.; Shu, X. W.; Swinbank, A. M.; Tee, W. -L.; Toba, Y.; Valiante, E.; Wang, Junxian; Zheng, X. Z.
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2017
卷号: 844, 期号:1, 页码:L10-
英文摘要: 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 redshifts. In this Letter, we analyze deep ALMA/870 mu m and SCUBA-2/450 mu m imaging of the claimed "post-starburst" galaxy ZF 20115 at z = 3.717 that exhibits a strong Balmer break and absorption lines. The rest-frame far-infrared imaging identifies a luminous starburst 0.'' 4 +/- 0.'' 1 (similar to 3 kpc in projection) from the position of the ultraviolet/optical emission and is consistent with lying at the redshift of ZF 20115. The star-forming component, with an obscured star formation rate of 100(-70)(+15) M-circle dot yr(-1), is undetected in the rest-frame ultraviolet but contributes significantly to the lower angular resolution photometry at rest-frame wavelengths greater than or similar to 3500 angstrom. This contribution from the obscured starburst, especially in the Spitzer/IRAC wavebands, significantly complicates the determination of a reliable stellar mass for the ZF 20015 system, and we conclude that this source does not pose a challenge to current models of galaxy formation. The multi-wavelength observations of ZF 20115 unveil a complex system with an intricate and spatially varying star formation history. ZF 20115 demonstrates that understanding high-redshift obscured starbursts will only be possible with multi-wavelength studies that include high-resolution observations, available with the James Webb Space Telescope, at mid-infrared wavelengths.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17398
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