Tomography of the environment of the COSMOS/AzTEC-3 submillimeter galaxy at z ∼ 5.3 revealed by Lyα and MUSE observations

被引：4

作者：

Guaita, L. ^{[1
,2
]}

Aravena, M. ^{[2
]}

Gurung-Lopez, S. ^{[3
,4
]}

Cantalupo, S. ^{[5
,6
]}

Marino, R. ^{[6
]}

Riechers, D. ^{[7
]}

da Cunha, E. ^{[8
]}

Wagg, J. ^{[9
]}

Algera, H. S. B. ^{[10
,11
]}

Dannerbauer, H. ^{[12
,13
]}

Cox, P. ^{[14
,15
]}

机构：

[1] Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile

[2] Univ Diego Portales, Fac Ingn & Ciencia, Nucleo Astron, Av Ejercito 441, Santiago, Chile

[3] Univ Valencia, Observ Astron, C Catedratico Jose Beltran 2, Valencia 46980, Spain

[4] Univ Valencia, Dept Astron & Astrofis, Valencia 46100, Spain

[5] Univ Milano Bicocca, Dipartimento Fis, Piazza Sci 3, I-20126 Milan, Italy

[6] Swiss Fed Inst Technol, Inst Astron, CH-8093 Zurich, Switzerland

[7] Univ Cologne, Phys Inst 1, Zulpicher Str 77, D-50937 Cologne, Germany

[8] Univ Western Australia, Int Ctr Radio Astron Res, 35 Stirling Hwy, Crawley, WA 6009, Australia

[9] SKA Org, Macclesfield SK11 9DL, Cheshire, England

[10] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan

[11] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan

[12] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38205, Tenerife, Spain

[13] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain

[14] UPMC Univ Paris 6, Sorbonne Univ, 98b Blvd Arago, F-75014 Paris, France

[15] CNRS, UMR 7095, Inst Astrophys Paris, 98b Blvd Arago, F-75014 Paris, France

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 660卷

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

galaxies: high-redshift; galaxies: interactions; galaxies: evolution; galaxies: kinematics and dynamics; galaxies: starburst; galaxies: clusters: general; LARGE-SCALE STRUCTURE; LYMAN-BREAK GALAXY; STAR-FORMATION; ALMA SURVEY; PROTOCLUSTER REGION; RADIATIVE-TRANSFER; COOLING RADIATION; DUSTY STARBURSTS; ESCAPE FRACTIONS; TYPICAL GALAXIES;

D O I：

10.1051/0004-6361/202142384

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Submillimeter galaxies (SMGs) have been proposed as the progenitors of massive ellipticals in the local Universe. Mapping the neutral gas distribution and investigating the gas accretion toward the SMGs at high redshift can provide information on the way SMG environments can evolve into clusters at z = 0. Aims. In this work, we study the members of the protocluster around AzTEC-3, a submillimeter galaxy at z = 5.3. We use Ly alpha emission and its synergy with previous CO and [CII] 158 mu m observations. Methods. We analyzed the data from the Multi Unit Spectroscopic Explorer (MUSE) instrument in an area of 1.4 x 1.4 arcmin(2) around AzTEC-3 and derived information on the Ly alpha line in emission. We compared the Ly alpha profile of various regions of the environment with the zELDA radiative transfer model, revealing the neutral gas distribution and kinematics. Results. We identified ten Ly alpha emitting sources, including two regions with extended emission: one embedding AzTEC-3 and LBG-3, which is a star-forming galaxy located 2" (12 kpc) north of the SMG and another toward LBG-1, which is a star-forming galaxy located 15 '' (90 kpc) to the southeast. The two regions extend for similar to 27 x 38 kpc(2) (similar to 170 x 240 ckpc(2)) and similar to 20 x 20 kpc(2) (similar to 125 x 125 ckpc(2)), respectively. The sources appear distributed in an elongated configuration of about 70" (430 kpc) in extent. The number of sources confirms the overdensity around AzTEC-3. We study the MUSE spectra of the AzTEC-3+LBG-3 system and LBG-1 in detail. For the AzTEC-3+LBG-3 system, the Ly alpha emission appears redshifted and more spatially extended than the [C II] line emission. Similarly, the Ly alpha line spectrum is broader in velocity than [C II] for LBG-1. In the former spectrum, the Ly alpha emission is elongated to the north of LBG-3 and to the south of AzTEC-3, where a faint Ly alpha emitting galaxy is also located. The elongated structures could resemble tidal features due to the interaction of the two galaxies with AzTEC-3. Also, we find a bridge of gas, revealed by the Ly alpha emission between AzTEC-3 and LBG-3. The Ly alpha emission toward LBG-1 embeds its three components. The HI kinematics support the idea of a merger of the three components. Conclusions. Given the availability of CO and [C II] observations from previous campaigns, and the Ly alpha information from our MUSE dataset, we find evidence of starburst-driven phenomena and interactions around AzTEC-3. The stellar mass of the galaxies of the overdensity and the Ly alpha luminosity of the HI nebula associated with AzTEC-3 imply a dark matter halo of similar to 10(12) M-circle dot at z = 5.3. By comparing this with semi-analytical models, the dark matter halo mass indicates that the region could evolve into a cluster of 2 x 10(13) M-circle dot by z = 2 and into a Fornax-type cluster at z = 0 with a typical mass of 2 x 10(14) M-circle dot.

引用

页数：26