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arXiv 2009.00617astro-ph.GA
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CLEAR:Paschen- $β$星形成率和低红移星系的尘埃衰减

CLEAR: Paschen-$β$ Star Formation Rates and Dust Attenuation of Low Redshift Galaxies

Nikko J. Cleri, Jonathan R. Trump, Bren E. Backhaus, Ivelina Momcheva, Casey Papovich, Raymond Simons, Benjamin Weiner, Vicente Estrada-Carpenter, Steven L. Fin… 展开作者

Nikko J. Cleri, Jonathan R. Trump, Bren E. Backhaus, Ivelina Momcheva, Casey Papovich, Raymond Simons, Benjamin Weiner, Vicente Estrada-Carpenter, Steven L. Finkelstein, Mauro Giavalisco, Zhiyuan Ji, Intae Jung, Jasleen Matharu, Felix Martinez, Megan R. Sturm

摘要:

利用哈勃空间望远镜($\HST$)G141棱镜的\Pab \(1282 nm)观测数据,研究了CANDELS-Ly $α$再电离辐射(CLEAR)巡天中29个低红移($z < 0.287$)星系的恒星形成和尘埃衰减特性。我们首先比较了从$\Pab/\Ha$的星云衰减与从光谱能量分布推断出的恒星衰减,发现我们样本中的星系与连续谱衰减与星云气体的平均比率为0.44是一致的,但有大量的多余散射超出了观测的不确定性。这种散射大部分与(天基)$\Pab$到(地基)PDMATHAMS测量的星云尘埃衰减与(地基)$\Ha/\Hb$测量的星云尘埃衰减之间的巨大差异有关。这意味着有重要的差异,从基于GRISM/宽孔径$\Pab$通量和基于地面/狭缝测量的巴耳末衰减测量的衰减。接下来,我们将比较来自$\Pab$和来自尘埃校正UV的恒星形成率(SFR)。我们进行了生存分析,以推断由检测和未检测暗示的\Pab \发射的普查。我们发现的证据表明,较低的恒星质量的星系有更多的散射比的\Pab \衰减校正的紫外SFR。当考虑到我们的\Pab \探测极限时,这一观测结果支持了低质量星系经历“爆发性”恒星形成历史的观点。总之,这些结果表明,\Pab \是一个星系的SFR的有价值的示踪剂,探测恒星形成的不同时间尺度,并可能揭示恒星形成,否则错过了紫外线和光学示踪剂。

英文摘要:

We use \Pab\ (1282~nm) observations from the Hubble Space Telescope ($\HST$) G141 grism to study the star-formation and dust attenuation properties of a sample of 29 low-redshift ($z < 0.287$) galaxies in the CANDELS Ly$α$ Emission at Reionization (CLEAR) survey. We first compare the nebular attenuation from $\Pab/\Ha$ with the stellar attenuation inferred from the spectral energy distribution, finding that the galaxies in our sample are consistent with an average ratio of the continuum attenuation to the nebular gas of 0.44, but with a large amount of excess scatter beyond the observational uncertainties. Much of this scatter is linked to a large variation between the nebular dust attenuation as measured by (space-based) $\Pab$ to (ground-based) $\Ha$ to that from (ground-based) $\Ha/\Hb$. This implies there are important differences between attenuation measured from grism-based / wide-aperture $\Pab$ fluxes and the ground-based / slit-measured Balmer decrement. We next compare star-formation rates (SFRs) from $\Pab$ to those from dust-corrected UV. We perform a survival analysis to infer a census of \Pab\ emission implied by both detections and non-detections. We find evidence that galaxies with lower stellar mass have more scatter in their ratio of \Pab\ to attenuation-corrected UV SFRs. When considering our \Pab\ detection limits, this observation supports the idea that lower mass galaxies experience "burstier" star-formation histories. Together, these results show that \Pab\ is a valuable tracer of a galaxy's SFR, probing different timescales of star-formation and potentially revealing star-formation that is otherwise missed by UV and optical tracers.

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