A spatially resolved analysis of star-formation burstiness by comparing UV and H$\alpha$ in galaxies at z$\sim$1 with UVCANDELS

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Vihang Mehta Harry I. Teplitz Claudia Scarlata Xin Wang Anahita Alavi James Colbert Marc Rafelski Norman Grogin Anton Koekemoer Laura Prichard Rogier Windhorst Justin M. Barber Christopher J. Conselice Y. Sophia Dai Jonathan P. Gardner Eric Gawiser Yicheng Guo Nimish Hathi Pablo Arrabal Haro Matthew Hayes

摘要： The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides HST/UVIS F275W imaging for four CANDELS fields. We combine this UV imaging with existing HST/near-IR grism spectroscopy from 3D-HST+AGHAST to directly compare the resolved rest-frame UV and H$\alpha$ emission for a sample of 979 galaxies at $0.71.5$), suggesting that bursty star-formation is likely prevalent in the outskirts of even the most massive galaxies but is likely over-shadowed by their brighter cores. Furthermore, we present the UV-to-H$\alpha$ ratio as a function of galaxy surface brightness, a proxy for stellar mass surface density, and find that regions below $\sim10^8~M_\odot~kpc^{-2}$ are consistent with bursty star-formation, regardless of their galaxy stellar mass, potentially suggesting that local star-formation is independent of global galaxy properties at the smallest scales.

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