分类： 天文学 >> 天文学 提交时间： 2023-02-19
Yun Huang
Kyoung-Soo Lee
Olga Cucciati
Brian Lemaux
Marcin Sawicki
Nicola Malavasi
Vandana Ramakrishnan
Rui Xue
Letizia P. Cassara
Yi-Kuan Chiang
Arjun Dey
Stephen D. J. Gwyn
Nimish Hathi
Laura Pentericci
Moire Prescott
Gianni Zamorani
摘要： The discovery and spectroscopic confirmation of Hyperion, a proto-supercluster at z~2.47, provides an unprecedented opportunity to study distant galaxies in the context of their large-scale environment. We carry out deep narrow-band imaging of a ~1*1 deg^2 region around Hyperion and select 157 Lya emitters (LAEs). The inferred LAE overdensity is delta_g~40 within an effective volume of 30*20*15 cMpc^3, consistent with the fact that Hyperion is composed of multiple protoclusters and will evolve into a super-cluster with a total mass of M_tot ~1.4*10^15 M_sun at z=0. The distribution of LAEs closely mirrors that of known spectroscopic members, tracing the protocluster cores and extended filamentary arms connected to them, suggesting that they trace the same large-scale structure. By cross-correlating the LAE positions with HI tomography data, we find weak evidence that LAEs may be less abundant in the highest HI regions, perhaps because Lya is suppressed in such regions. The Hyperion region hosts a large population of active galactic nuclei (AGN), ~12 times more abundant than that in the field. The prevalence of AGN in protocluster regions hints at the possibility that they may be triggered by physical processes that occur more frequently in dense environments, such as galaxy mergers. Our study demonstrates LAEs as reliable markers of the largest cosmic structures. When combined with ongoing and upcoming imaging and spectroscopic surveys, wide-field narrow-band imaging has the potential to advance our knowledge in the formation and evolution of cosmic structures and of their galaxy inhabitants.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Lu Shen
Brian C. Lemaux
Lori M. Lubin
Guilin Liu
Matthieu Béthermin
Médéric Boquien
Olga Cucciati
Olivier Le Fèvre
Margherita Talia
Daniela Vergani
Gianni Zamorani
Andreas L. Faisst
Michele Ginolfi
Carlotta Gruppioni
Gareth C. Jones
Sandro Bardelli
Nimish Hathi
Anton M. Koekemoer
Michael Romano
Daniel Schaerer
摘要： We present the radio properties of 66 spectroscopically-confirmed normal
star-forming galaxies (SFGs) at $4.4
点击量
待评议
点击量
下载量
评论
