Candidate Population III stellar complex at z = 6.629 in the MUSE Deep Lensed Field

Candidate Population III stellar complex at z = 6.629 in the MUSE Deep Lensed Field
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MUSE 深透镜视场中 z = 6.629 处的候选族 III 恒星复合体

DOI:
10.1093/mnrasl/slaa041
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发表时间:
2020
影响因子:
--
通讯作者:
Sani, E
Sani, E
中科院分区:
--
文献类型:
--
作者:
Vanzella, E;Meneghetti, M;Caminha, G B;Castellano, M;Calura, F;Rosati, P;Grillo, C;Dijkstra, M;Gronke, M;Sani, E

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我们在缪斯深透镜场中发现了一个强透镜的(μ≳40)Ly α辐射ATZ=6.629(S/N≃18),目标是哈勃前沿场星系团MACS J0416。专门的透镜模拟表明,Ly α发射区必然穿过焦散。Ly α的弧形形状在观测平面上延伸3角秒,是两幅合并的多幅图像的结果,每一幅图像的Ly α亮度都减弱了,L≲2.8G×1040erg S−1来自一个受限区域(≲150 PC有效半径)。在S/N≃2上叠加近红外波段后,几乎没有探测到空间上未分辨的哈勃空间望远镜对应物,对应于观测到的(固有)星等1500≳30.8(≳35.0)。如果IGM变速器为TIGM;0.5时,推断的静止帧Ly α当量宽度为Ew0;>1120?低亮度和极大的Ly αEW0与人口三(Pop αIII)恒星复合体的情况相匹配,该恒星复合体由数十颗恒星(∼104m⊙)组成,照射着穿过焦散的高层区域。虽然Ly α和恒星连续体是这次红移观测到的最弱的星体之一,但连续体和Ly α的发射可能会受到不同放大倍率的影响,可能会偏离EW0的估计。前述的试探性HST探测倾向于支持大的EW0,使这样一个微弱的Pop-III候选者成为詹姆斯·韦伯空间望远镜和超大型望远镜的关键目标。
We discovered a strongly lensed (μ ≳ 40) Ly α emission atz= 6.629 (S/N ≃ 18) in the MUSE Deep Lensed Field (MDLF) targeting the Hubble Frontier Field (HFF) galaxy cluster MACS J0416. Dedicated lensing simulations imply that the Ly α emitting region necessarily crosses the caustic. The arc-like shape of the Ly α extends 3 arcsec on the observed plane and is the result of two merged multiple images, each one with a de-lensed Ly α luminosityL≲ 2.8 × 1040erg s−1arising from a confined region (≲150 pc effective radius). A spatially unresolvedHubble Space Telescope(HST) counterpart is barely detected at S/N ≃ 2 after stacking the near-infrared bands, corresponding to an observed (intrinsic) magnitudem1500≳ 30.8 (≳35.0). The inferred rest-frame Ly α equivalent width is EW0> 1120 Å if the IGM transmission isTIGM< 0.5. The low luminosities and the extremely large Ly α EW0match the case of a Population III (Pop III) star complex made of several dozens stars (∼104M⊙) that irradiate an Hiiregion crossing the caustic. While the Ly α and stellar continuum are among the faintest ever observed at this redshift, the continuum and the Ly α emissions could be affected by differential magnification, possibly biasing the EW0estimate. The aforementioned tentativeHSTdetection tends to favour a large EW0, making such a faint Pop III candidate a key target for theJames Webb Space Telescopeand Extremely Large Telescopes.
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发表时间: 2016
期刊: arXiv: Astrophysics of Galaxies
影响因子: --
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