The physics of Lyman α escape from high-redshift galaxies
The physics of Lyman α escape from high-redshift galaxies
复制标题
莱曼α逃离高红移星系的物理学
DOI:
10.1093/mnras/sty3483
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发表时间:
2018
影响因子:
4.8
通讯作者:
Kereš, Dušan
中科院分区:
文献类型:
--
作者:
Smith, Aaron;Ma, Xiangcheng;Bromm, Volker;Finkelstein, Steven L;Hopkins, Philip F;Faucher-Giguère, Claude-André;Kereš, Dušan
Lyman α (Lyα) photons from ionizing sources and cooling radiation undergo a complex resonant scattering process that generates unique spectral signatures in high-redshift galaxies. We present a detailed Lyα radiative transfer study of a cosmological zoom-in simulation from the Feedback In Realistic Environments (FIRE) project. We focus on the time, spatial, and angular properties of the Lyα emission over a redshift range of= 5–7, after escaping the galaxy and being transmitted through the intergalactic medium (IGM). Over this epoch, our target galaxy has an average stellar mass of. We find that many of the interesting features of the Lyα line can be understood in terms of the galaxy’s star formation history. The time variability, spatial morphology, and anisotropy of Lyα properties are consistent with current observations. For example, the rest-frame equivalent width has an $\text{EW}_{\text{Ly}\alpha ,0} \gt 20\, {\mathring{\rm A} }$ duty cycle ofwith a non-negligible number of sightlines with $\gt 100\, {\mathring{\rm A} }$, associated with outflowing regions of a starburst with greater coincident UV continuum absorption, as these conditions generate redder, narrower (or single-peaked) line profiles. The lowest equivalent widths correspond to cosmological filaments, which have little impact on UV continuum photons but efficiently trap Lyα and produce bluer, broader lines with less transmission through the IGM. We also show that in dense self-shielding, low-metallicity filaments and satellites, Lyα radiation pressure can be dynamically important. Finally, despite a significant reduction in surface brightness with increasing redshift, Lyα detections and spectroscopy of high-galaxies with the upcomingJames Webb Space Telescopeis feasible.
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DOI:
10.1088/0004-637x/728/1/52
发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
作者:
P. Laursen;J. Sommer;A. Razoumov
通讯作者:
A. Razoumov
DOI:
10.1111/j.1365-2966.2012.21809.x
发表时间:
2012
影响因子:
4.8
作者:
J. Wise;Tom Abel;M. Turk;M. Norman;Britton D. Smith
通讯作者:
Britton D. Smith
DOI:
10.1088/2041-8205/765/2/l27
发表时间:
2013-02
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
Matthew Hayes;G. Östlin;D. Schaerer;A. Verhamme;J. Mas-Hesse;A. Adamo;H. Atek;J. Cannon;
通讯作者:
Matthew Hayes;G. Östlin;D. Schaerer;A. Verhamme;J. Mas-Hesse;A. Adamo;H. Atek;J. Cannon;
影响因子:
4.8
作者:
Aaron Smith;B. T. Tsang;V. Bromm;M. Milosavljevic
通讯作者:
M. Milosavljevic
DOI:
10.1086/170587
发表时间:
1991
期刊:
The Astrophysical Journal
影响因子:
--
作者:
T. Scholz;H. Walters
通讯作者:
H. Walters