气候变化领域集成服务门户(CCPortal): The effects of biconical outflows on lyα escape from green peas

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DOI	10.3847/1538-4357/abc7c3
	The effects of biconical outflows on lyα escape from green peas
	Carr C.; Scarlata C.; Henry A.; Panagia N.
发表日期	2021
ISSN	0004637X
卷号	906 期号:2
英文摘要	We analyze the spectra of 10 Green Pea galaxies, previously studied by Henry et al., using a semi-analytical line transfer model to interpret emission and absorption features observed in UV galactic spectra. We focus our analysis on various ionization states of silicon, associated with the cool (∼104 K) and warm (∼105 K) gas. By analyzing low-ionization lines, we study the relationships between the distribution and kinematics of the outflowing H I gas and the observed Lyα escape fraction, fescLya, as well as the Lyα emission peak separation, Δpeak. We find that outflow geometries that leave a portion of the source uncovered along the line of sight create the best conditions for Lyα escape and have narrow peak separations, while geometries that block the observer's view of the source create the worst conditions for Lyα escape and have large peak separations. To isolate the effects of outflow kinematics, we restrict our testing set to galaxies with spherical outflows and find that fescLya and the Lyα luminosity both increase with the extent of the galactic winds. A simple estimate suggests that the collisional excitation of neutral hydrogen by free electrons in the cool gas of the winds can account for the Lyα luminosity observed in these objects. Finally, we speculate on the relationship between outflows and the escape of ionizing radiation from the circumgalactic medium. © 2021. The American Astronomical Society. All rights reserved.
来源期刊	Astrophysical Journal
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177273
作者单位	University of Minnesota, 316 Church Street SE, Minneapolis, MN 55455, United States; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, United States; INAF-NA, Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, Naples, I-80131, Italy; Supernova Ltd, OYV #131, Northsound Road, Virgin Gorda, Virgin Islands, VG1150, United Kingdom
推荐引用方式 GB/T 7714	Carr C.,Scarlata C.,Henry A.,et al. The effects of biconical outflows on lyα escape from green peas[J],2021,906(2).
APA	Carr C.,Scarlata C.,Henry A.,&Panagia N..(2021).The effects of biconical outflows on lyα escape from green peas.Astrophysical Journal,906(2).
MLA	Carr C.,et al."The effects of biconical outflows on lyα escape from green peas".Astrophysical Journal 906.2(2021).