IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
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IFU 对 Mrk 71/NGC 2366 可能的莱曼连续逃逸的调查
DOI：
10.1051/0004-6361/201834838
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发表时间：
2019
影响因子：
6.5
通讯作者：
Girichidis
中科院分区：
文献类型：
--
作者：
Micheva;Herenz;Östlin;Girichidis
上下文Mrk 71/NGC 2366是最接近的绿色豌豆（GP）类似物和候选莱曼连续体（LyC）发射体。最近，通过对电离连续体的直接观测，已经检测到11个LyC泄漏的GP，使其成为任何红移下最丰富的一类确认的LyC发射体。高分辨率，GPS的多波长研究可以导致对LyC从这些星系中逃逸的方法的理解。Mrk 71/NCG 2366的接近为GP类似物的内部工作提供了前所未有的细节，并使我们能够确定LyC逃逸的机制。利用5825-7650个积分场单位的PMAS观测资料，研究了Mrk 71的运动学和物理条件。从[S II]比率获得电子密度图。偶然的[O II]λ3727二重态的二级污染使得能够构建电子温度图。得到了声速、热展宽、“真实”速度色散和马赫数的解析图，并与高分辨率磁流体动力学模拟分子云生命周期（SILCC）模拟结果进行了比较。两个地区的速度色散增加外流的指示检测到北部和南部的超级星星集群，结B，红移和蓝移的速度，分别。我们确认存在一个微弱的广泛的运动学组件，这似乎是脱钩的流出区域，是微弱和狭窄的比以前在文献中报道。在不确定的情况下，低电离和高电离气体一起移动。在Mrk 71的核心之外，探测到马赫数的增加，这意味着气体密度的降低。模拟表明，密度的这种下降可以高达104 dex，下降到几乎光学薄的水平，这意味着即使假设所有检测到的H I气体都位于视线中的Mrk 71的前面，沿流出物的LyC逃逸分数沿着也是非零的。我们的研究结果强烈表明，运动反馈是一个重要的成分，在GP的LyC泄漏。
Context. Mrk 71/NGC 2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to an understanding of the method(s), through which LyC escapes from these galaxies.Aims. The proximity of Mrk 71/NCG 2366 offers unprecedented detail on the inner workings of a GP analog, and enables us to identify the mechanisms of LyC escape.Methods. We used 5825–7650 Å integral field unit PMAS observations to study the kinematics and physical conditions in Mrk 71. An electron density map was obtained from the [S II] ratio. A fortuitous second order contamination by the [O II]λ3727 doublet enabled the construction of an electron temperature map. Resolved maps of sound speed, thermal broadening, “true” velocity dispersion, and Mach number were obtained and compared to the high resolution magnetohydrodynamic SImulating the LifeCycle of molecular Clouds (SILCC) simulations.Results. Two regions of increased velocity dispersion indicative of outflows are detected to the north and south of the super star cluster, knot B, with redshifted and blueshifted velocities, respectively. We confirm the presence of a faint broad kinematical component, which is seemingly decoupled from the outflow regions, and is fainter and narrower than previously reported in the literature. Within uncertainties, the low- and high-ionization gasses move together. Outside of the core of Mrk 71, an increase in Mach numbers is detected, implying a decrease in gas density. Simulations suggest this drop in density can be as high as ∼4 dex, down to almost optically thin levels, which would imply a nonzero LyC escape fraction along the outflows even when assuming all of the detected H I gas is located in front of Mrk 71 in the line of sight.Conclusions. Our results strongly indicate that kinematical feedback is an important ingredient for LyC leakage in GPs.
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影响因子：
4.8
作者：
Y. Izotov;G. Worseck;D. Schaerer;N. Guseva;T. Thuan;K. Fricke;A. Verhamme;I. A. Observatory;Kyiv;Ukraine;Institut fur Physik und Astronomie;U. Potsdam;H Germany;Observatoire de Geneve;Versoix;Switzerland.;A. Department;U. Virginia;Charlottesville;Usa;I. F. Astrophysik;Goettingen Universitat;A. Institute;Prague;Czech Republic
通讯作者：
Y. Izotov;G. Worseck;D. Schaerer;N. Guseva;T. Thuan;K. Fricke;A. Verhamme;I. A. Observatory;Kyiv;Ukraine;Institut fur Physik und Astronomie;U. Potsdam;H Germany;Observatoire de Geneve;Versoix;Switzerland.;A. Department;U. Virginia;Charlottesville;Usa;I. F. Astrophysik;Goettingen Universitat;A. Institute;Prague;Czech Republic
星暴区NGC 2363及其周围的恒星形成历史
DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
L. Drissen;J. Roy;C. Robert;D. Devost;R. Doyon
通讯作者：
R. Doyon
NGC 2363 恒星超星系团 A 中宽阔的 Hα、[O III] 线翼和湍流混合层假说
影响因子：
6.5
作者：
L. Binette;L. Drissen;L. Úbeda;A. Raga;C. Robert;Y. Krongold
通讯作者：
Y. Krongold
河外巨型 H II 区域 NGC 2363 宽发射线的起源
DOI：
10.1086/171035
发表时间：
1992
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Roy;M. Aubé;M. McCall;R. Dufour
通讯作者：
R. Dufour
“绿豌豆”星系中电离辐射的起源和光学深度
DOI：
10.1088/0004-637x/766/2/91
发表时间：
2013
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Jaskot;M. Oey
通讯作者：
M. Oey