Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2
Emma Curtis-Lake, Stefano Carniani, Alex Cameron, Stephane Charlot, Peter Jakobsen, Roberto Maiolino, Andrew Bunker, Joris Witstok, Renske Smit, Jacopo Chevalla… 展开作者
Emma Curtis-Lake, Stefano Carniani, Alex Cameron, Stephane Charlot, Peter Jakobsen, Roberto Maiolino, Andrew Bunker, Joris Witstok, Renske Smit, Jacopo Chevallard, Chris Willott, Pierre Ferruit, Santiago Arribas, Nina Bonaventura, Mirko Curti, Francesco D'Eugenio, Marijn Franx, Giovanna Giardino, Tobias J. Looser, Nora Lützgendorf, Michael V. Maseda, Tim Rawle, Hans-Walter Rix, Bruno Rodriguez del Pino, Hannah Übler, Marko Sirianni, Alan Dressler, Eiichi Egami, Daniel J. Eisenstein, Ryan Endsley, Kevin Hainline, Ryan Hausen, Benjamin D. Johnson, Marcia Rieke, Brant Robertson, Irene Shivaei, Daniel P. Stark, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer, Rachana Bhatawdekar, Rebecca Bowler, Kristan Boyett, Zuyi Chen, Anna de Graaff, Jakob M. Helton, Raphael E. Hviding, Gareth C. Jones, Nimisha Kumari, Jianwei Lyu, Erica Nelson, Michele Perna, Lester Sandles, Aayush Saxena, Katherine A. Suess, Fengwu Sun, Michael W. Topping, Imaan E. B. Wallace, Lily Whitler
Finding and characterising the first galaxies that illuminated the early Universe at cosmic dawn is pivotal to understand the physical conditions and the processes that led to the formation of the first stars. In the first few months of operations, imaging from the James Webb Space Telescope (JWST) have been used to identify tens of candidates of galaxies at redshift (z) greater than 10, less than 450 million years after the Big Bang. However, none of these candidates has yet been confirmed spectroscopically, leaving open the possibility that they are actually low-redshift interlopers. Here we present spectroscopic confirmation and analysis of four galaxies unambiguously detected at redshift 10.3<z<13.2, previously selected from NIRCam imaging. The spectra reveal that these primeval galaxies are extremely metal poor, have masses between 10^7 and a few times 10^8 solar masses, and young ages. The damping wings that shape the continuum close to the Lyman edge are consistent with a fully neutral intergalactic medium at this epoch. These findings demonstrate the rapid emergence of the first generations of galaxies at cosmic dawn.
First Spectroscopic Confirmations of z ~ 7.0 Lya Emitting Galaxies in the LAGER Survey
窄带成像是发现大量z~6.6的高红移Lya发射星系(LAEs)的一种非常成功的方法。然而,在z> 7时,只有3个窄带选择性LAEs(2个在z~6.9-7.0,1个在z~7.3)得到了光谱证实,这阻碍了对这一关键时期宇宙再电离和星系演化的广泛研究。利用大面积窄带巡天LAGER(Lyman-Alpha Galerkin at the End of Reionization),我们在COSMOS场中选取了23个z~6.9的候选LAEs。在这项工作中,我们提出了12个候选人使用IMACS麦哲伦光谱的后续观测。对于其中的9个,观测足够深,可以检测到预期的线。在六个光源中识别出Lya发射线(成功率为2/3),包括3个发光的LAE,Lya光度为L(Lya)~ 10^{43.5} erg/s,是已知光谱证实的星系中最高的,>~7.0。这使光谱学确认的z>~7处的窄带选择LAE的样本大小增加了两倍,并确认了我们先前基于光度测量样本导出的Lya光度函数中的亮端凸起,支持斑片状再电离场景。两个发光的LAE出现物理联系,投影距离为1.1 pMpc,速度差为~ 170 km/s。它们可能位于由它们自己或与近邻产生的共同电离气泡中,这减少了Lya的IGM衰减。在一个源中可以看到一条暂时狭窄的NV $λ$ 1240线,暗示着中心大质量黑洞的活动,富含金属的线发射气体。
A spectroscopic follow-up program of very massive galaxies at 3<z<4: confirmation of spectroscopic redshifts, and a high fraction of powerful AGN
我们提出了一个光谱后续程序的分析和结果的质量选择的6个星系的样品在3 < z < 4 using data from Keck-NIRSPEC and VLT-Xshooter. We confirm the z >3红移的一半的样品通过检测强星云发射线,并提高zphot精度的其余样品通过结合测光和光谱。采用改进的红移对发射线校正后的光谱能量分布(SED)进行建模,证实了在宇宙历史的前2个Gyr中,样本的恒星质量非常大(M * ~ 1.5-4 × 10^11 Msun),恒星年龄、恒星形成速率和尘埃含量的变化范围也不同。通过对发射线的光度和宽度以及远红外线通量的分析,我们确认80%以上的样品是明亮的隐藏活动星系核(AGN)的宿主,其辐射光度为~10^(44-46)erg/s。我们发现,MIPS 24 μ m光度法在很大程度上被活动星系核连续体所污染,使得仅使用24 μ m光度法得到的SFR被严重高估。通过将活动星系核的辐射包括在紫外到远红外辐射的SED模型中,我们证实活动星系核的存在不会对恒星质量产生很大的偏差(在1σ处< 0.3 dex)。我们的证据表明,在z~2和z~3之间的1 Gyr期间,活动星系核的分数从~30%迅速增加到~60-100%。虽然我们不能排除一些增强的活动星系核分数为我们的样本,由于选择效应,小测量的[OIII]污染所观察到的K波段通量表明,我们的…
Spectroscopic confirmation of a large and luminous galaxy with weak emission lines at $\mathbf{z = 13.53}$
NSF’s National Optical-Infrared Astronomy Research Laboratory(美国国家光学-红外天文研究实验室);Institute for Astronomy, University of Edinburgh(爱丁堡大学天体物理研究所);Center for Space Sciences and Technology, UMBC(马里兰大学巴尔的摩分校空间科学与技术中心);Astrophysics Science Division, NASA Goddard Space Flight Center(NASA戈达德太空飞行中心天体物理学部);Department of Astronomy, The University of Texas at Austin(德克萨斯大学奥斯汀分校天文学系);Cosmic Frontier Center, The University of Texas at Austin(德克萨斯大学奥斯汀分校宇宙前沿中心)
Spectroscopic Confirmation of the Dragonfish Association: The Galaxy's Most Luminosity OB Association
质量大于10 $^4$ M $_{\sun}$的年轻OB星系团被推断存在于银河系中,但在很大程度上逃避了检测。最近,在银河系中最明亮的恒星形成复合体--龙鱼星云中,已经确定了一个候选的OB星协。我们确定了18个年轻的,大质量的恒星与近红外光谱从50个成员的样本内的候选OB协会,包括15 O型,和三个明亮的蓝色变星或沃尔夫-拉叶星。这个数字与候选星协中大质量恒星的预期产量相匹配,证实了它的存在和为母星形成复合体提供动力的能力。这些结果证明了10 $^5$ M $_{\sun}$ OB星协的存在,它比银河系中以前已知的任何星协都要强大,其质量只能与Westerlund 1相比。此外,结果还验证了用于识别关联的颜色选择方法,为以相同方式发现的其他方法增加了可信度。
Spectroscopic confirmation of dual and offset quasars from the Subaru HSC-SSP program
School of Physics & Astronomy, University of Southampton(南安普顿大学物理与天文学院);Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo(东京大学宇宙物理数学研究所(WPI));Department of Astronomy, School of Science, The University of Tokyo(东京大学理学部天文学系);Center for Data-Driven Discovery, Kavli IPMU (WPI), UTIAS, The University of Tokyo(东京大学UTIAS卡弗里IPMU数据驱动发现中心);Center for Astrophysical Sciences, Department of Physics & Astronomy, Johns Hopkins University(约翰斯·霍普金斯大学物理与天文学系天体科学中心);Department of Astronomy and Astrophysics, University of California, Santa Cruz(加州大学圣克鲁兹分校天文学与天体物理学系);School of Physics and Technology, Wuhan University(武汉大学物理科学与技术学院);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Waseda Institute for Advanced Study (WIAS), Waseda University(早稻田大学高等研究院)
Spectroscopic Confirmation of two Extremely Massive Protoclusters BOSS1244 and BOSS1542 at $z=2.24$
我们目前的光谱确认两个新的大质量星系原星团在$z=2.24\pm0.02$,BOSS 1244和BOSS 1542,跟踪组的相干强Ly $α$吸收(CoSLA)系统的吸收光谱中的一些类星体从SDSS III的印记,并确定为超密度的窄带选择H $α$发射器(HAE)。使用MMT/MMIRS和LBT/LUCI近红外(NIR)光谱,我们确认46和36 HAE在BOSS 1244和BOSS 1542领域,分别。BOSS 1244在$z=2.230\pm0.002$处显示一个西南(SW)分量,在$z=2.246\pm0.001$处显示另一个东北(NE)分量,视线速度色散分别为$405\pm202$ km s $^{-1}$和$377\pm99$ km s $^{-1}$。有趣的是,我们发现BOSS 1244的SW区域在红移空间中包含两个子结构,可能合并形成一个更大的系统。相比之下,BOSS 1542表现出扩展的对流结构,在$z=2.241\pm0.001$处具有$247\pm32$ km s $^{-1}$的低速色散,直接证实了早期宇宙中的大尺度宇宙网。在15 cMpc尺度上的星系超密度$δ_{\rm g}$分别是BOSS 1244 SW、BOSS 1244 NE和BOSS 1542灯丝的$22.9\pm4.9$、$10.9\pm2.5$和$20.5\pm3.9$。它们是迄今为止在$z>2$…
Search for quasar pairs with Gaia astrometric data IV. Confirmation of 17 dual quasars and 143 projected quasars
School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院);Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿交叉科学研究院)
DESI Strong Lens Foundry IV: Spectroscopic Confirmation of DESI Lens Candidates with VLT/MUSE
University of California, Berkeley(加州大学伯克利分校);Gemini Observatory / NSF’s NOIRLab(吉米天文台 / 美国国家光学红外天文研究实验室);University of San Francisco(旧金山大学);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Institute for Astronomy, University of Hawaii(夏威夷大学天体物理研究所);University of Pittsburgh(匹兹堡大学);University of California, Los Angeles(加州大学洛杉矶分校);Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo(东京大学理化学研究所木下伽利略宇宙物质起源研究机构)
Search for Quasar Pairs with ${\it Gaia}$ Astrometric Data. III. Discovery of 9 dual and projected quasars
Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究所);Department of Physics, Nanchang University(南昌大学物理学院);Center for Relativistic Astrophysics and High Energy Physics, Nanchang University(南昌大学相对论天体物理与高能物理中心);Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院)
Z > 7 galaxies with red Spitzer/IRAC [3.6]-[4.5] colors in the full CANDELS data set: the brightest-known galaxies at Z ~ 7-9 and a probable spectroscopic confirmation at Z=7.48