发表机构
National Astronomical Observatories, Chinese Academy of Sciences; Guizhou University（中国科学院国家天文台; 贵州大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过FAST盲HI巡天和DESI光学成像发现孤立暗星系候选体J1351+0039，其暗物质与重子质量比达200，为研究无恒星形成环境下的重子物理与暗物质提供独特实验室。
AI 中文摘要
我们报道了J1351+0039的发现，这是一个新的孤立暗星系候选体，通过五百米口径球面射电望远镜（FAST）进行的盲HI巡天，结合DESI遗产巡天的深光学成像而识别。该天体显示出致密的HI结构，系统速度为V_{LSR} = 429.0 km/s，推断的HI质量为4.8×10^5太阳质量。在DESI图像中未探测到光学对应体，g波段表面亮度极限为28.1 mag arcsec^{-2}，对应的恒星质量上限M_{star}为1.5×10^5太阳质量。动力学质量估计为M_{dyn} = 1.3×10^8太阳质量，得出暗物质与重子物质质量比为200，这意味着J1351+0039 overwhelmingly由暗物质主导。虽然在J1351+0039中探测到微弱的旋转，但运动学主要由内部速度弥散主导，证实了压力支持，并让人联想到再电离受限HI云（RELHICs）。J1351+0039作为最有前景的孤立RELHIC候选体之一脱颖而出，为在没有恒星形成的情况下研究重子物理和暗物质提供了独特的实验室。
英文摘要
We report the discovery of J1351+0039, a new isolated dark galaxy candidate identified through a blind HI survey with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with deep optical imaging from the DESI Legacy Survey. The object displays a compact HI structure with a systemic velocity of V_{LSR} = 429.0 \kms and an inferred HI mass of 4.8*10^5 Msun. No optical counterpart is detected in the DESI images, with a g-band surface brightness limit of 28.1 mag arcsec^{-2}, corresponding to a stellar mass limit of M_{star} of 1.5*10^{5} Msun. The dynamical mass is estimated to be M_{dyn} of 1.3*10^{8} Msun, yielding a dark-to-baryonic mass ratio of 200, implying that J1351+0039 is overwhelmingly dominated by dark matter. While week rotation is detected in J1351+0039, the kinematics are dominated by internal velocity dispersion, confirming pressure support and reminiscent of Reionization-Limited HI Clouds (RELHICs). J1351+0039 stands out as one of the most promising isolated RELHIC candidates, offering a unique laboratory for studying baryonic physics and dark matter in the absence of star formation.
Comments4 pages, 3 figures, submitted to A&A Letters
