The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas
Marques-Chaves, Rui1,2; Perez-Fournon, Ismael1,2; Gavazzi, Raphael3,4; Martinez-Navajas, Paloma I.1,2; Riechers, Dominik5; Rigopoulou, Dimitra2,6; Cabrera-Lavers, Antonio1,7; Clements, David L.8; Cooray, Asantha9; Farrah, Duncan10; Ivison, Rob J.11,12; Jimenez-Angel, Camilo E.1,2; Nayyeri, Hooshang9; Oliver, Seb13; Omont, Alain3; Scott, Douglas14; Shu, Yiping15,16; Wardlow, Julie17

The submillimeter galaxy (SMG) HERMES J105751.1+ 573027 (hereafter HLock01) at z = 2.9574 +/- 0.0001 is one of the brightest gravitationally lensed sources discovered in the Herschel Multi-tiered Extragalactic Survey. Apart from the high flux densities in the far-infrared, it is also extremely bright in the rest-frame ultraviolet (UV), with a total apparent magnitude m(UV) similar or equal to 19.7 mag. We report here deep spectroscopic observations with the Gran Telescopio Canarias of the optically bright lensed images of HLock01. Our results suggest that HLock01 is a merger system composed of the Herschel-selected SMG and an optically bright Lyman break-like galaxy (LBG), separated by only 3.3 kpc in projection. While the SMG appears very massive. (M-* similar or equal to 5 x 10(11) M-circle dot), with a highly extinguished stellar component (A(V) similar or equal to 4.3), the LBG is a young, lower-mass (M-* similar or equal to 1 x 10(10) M-circle dot), but still luminous (10 x L-UV*) satellite galaxy. Detailed analysis of the high signal-to-noise ratio (S/N) rest-frame UV spectrum of the LBG shows complex kinematics of the gas, exhibiting both blueshifted and redshifted absorption components. While the blueshifted component is associated with strong galactic outflows from the massive stars in the LBG, as is common in most star-forming galaxies, the redshifted component may be associated with gas inflow seen along a favorable sightline to the LBG. We also find evidence of an extended gas reservoir around HLock01 at an impact parameter of 110 kpc, through the detection of C II lambda lambda 1334 absorption in the red wing of a bright Ly alpha emitter at z similar or equal to 3.327. The data presented here highlight the power of gravitational lensing in high S/N studies to probe deeply into the physics of high-z star-forming galaxies.

Keywordcosmology: observations galaxies: evolution galaxies: individual (HLock01) galaxies: starburst gravitational lensing: strong
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425770500016
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorMarques-Chaves, Rui
Affiliation1.Inst Astrofis Canarias, C Via Lactea S-N, E-38205 Tenerife, Spain
2.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
3.UPMC, Inst Astrophys Paris, UMR7095, CNRS, F-75014 Paris, France
4.UPMC, Sorbonne Univ, F-75014 Paris, France
5.Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
6.Univ Oxford, Dept Phys, Astrophys, Keble Rd, Oxford OX1 3RH, England
7.GRANTECAN, Cuesta de San Jose S-N, E-38712 Brena Baja, La Palma, Spain
8.Imperial Coll London, Astrophys Grp, Blackett Lab, Prince Consort Rd, London SW7 2AZ, England
9.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
10.Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA
11.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
12.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
13.Univ Sussex, Dept Phys & Astron, Astron Ctr, Brighton BN1 9QH, E Sussex, England
14.Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada
15.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
16.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
17.Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England
Recommended Citation
GB/T 7714
Marques-Chaves, Rui,Perez-Fournon, Ismael,Gavazzi, Raphael,et al. The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas[J]. ASTROPHYSICAL JOURNAL,2018,854(2):20.
APA Marques-Chaves, Rui.,Perez-Fournon, Ismael.,Gavazzi, Raphael.,Martinez-Navajas, Paloma I..,Riechers, Dominik.,...&Wardlow, Julie.(2018).The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas.ASTROPHYSICAL JOURNAL,854(2),20.
MLA Marques-Chaves, Rui,et al."The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas".ASTROPHYSICAL JOURNAL 854.2(2018):20.
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