SMM J2135-0102

SMM J2135-0102
Name	SMM J2135-0102
Epoch	J2000
Constellation name	Aquarius
Type	Submillimetre galaxy
Redshift	2.3259
Names	"Cosmic Eyelash"

SMM J2135-0102 is a strongly lensed submillimetre galaxy first identified in deep submillimetre surveys and notable for extreme star formation and resolved molecular gas structure. It was characterized through coordinated observations with interferometers and space telescopes that exploited gravitational lensing by a foreground cluster to probe starburst regions at kiloparsec and sub-kiloparsec scales. The object has informed studies linking high-redshift galaxy evolution, molecular cloud physics, and feedback processes in the early Universe.

Discovery and observation

The detection followed wide-area surveys using instruments like the Submillimetre Common-User Bolometer Array (SCUBA), the James Clerk Maxwell Telescope (JCMT), the Atacama Pathfinder Experiment (APEX), and the Institut de Radioastronomie Millimétrique (IRAM). Follow-up high-resolution imaging was obtained with the Submillimeter Array (SMA), the Karl G. Jansky Very Large Array (VLA), the Plateau de Bure Interferometer (PdBI), and the Atacama Large Millimeter/submillimeter Array (ALMA). Space observatories such as the Hubble Space Telescope (HST), the Spitzer Space Telescope (Spitzer), and the Herschel Space Observatory (Herschel) provided complementary optical, infrared, and far-infrared constraints. Spectroscopic redshift confirmation used instruments on the European Southern Observatory (ESO), the Very Large Telescope (VLT), and the Keck Observatory (Keck).

Physical properties

Measurements indicate a dusty, gas-rich system with far-infrared luminosity comparable to ultraluminous infrared galaxies studied by the Infrared Astronomical Satellite (IRAS) and the Infrared Space Observatory (ISO). Molecular line detections include multiple transitions of carbon monoxide observed with the Nobeyama Radio Observatory (NRO) and the Combined Array for Research in Millimeter-wave Astronomy (CARMA), plus fine-structure lines probed by Herschel. Derived quantities, informed by radiative transfer models and initial mass functions from studies by Salpeter and Kroupa, imply high molecular gas mass and surface density resembling conditions in local starbursts like Messier 82 (M82) and Arp 220 (Arp 220). Dust temperature and emissivity estimates reference calibration work by Planck Collaboration and COBE FIRAS observations.

Gravitational lensing and magnification

The source is magnified by a foreground galaxy cluster and individual lensing galaxies analyzed using lens models from groups employing Lenstool and GLAFIC methodologies developed in gravitational lensing studies of Abell and MACS clusters such as Abell 1689 (Abell 1689) and MACS J0717.5+3745 (MACS J0717.5+3745). Lensing reconstructions used constraints from Hubble Frontier Fields programs and techniques applied in analyses of Einstein rings and giant arcs in the work of Soucail, Kneib, and Broadhurst. Magnification enabled spatially resolved studies analogous to lens-aided reconstructions of cB58 (MS 1512-cB58) and Cosmic Horseshoe (Cosmic Horseshoe), permitting investigation into clump-scale star-forming regions and differential magnification effects accounted for in analyses by Schneider, Kochanek, and Blandford.

Star formation and interstellar medium

Resolved submillimetre clumps reveal intense, compact star-forming regions with star-formation rate surface densities compared against Kennicutt–Schmidt relations developed by Kennicutt and Schmidt and compared with molecular cloud studies by Larson and Solomon. Emission from CO, HCN, and [C II] lines probed the dense gas fraction and photon-dominated region physics described in models by Tielens and Hollenbach. Observations informed feedback scenarios similar to those in simulations by Hopkins and Ostriker, and linked to outflow signatures studied in Na I D and Mg II in surveys by Rupke and Veilleux. Comparisons have been drawn to local extreme starbursts such as NGC 253 (NGC 253) and high-redshift submillimetre samples compiled by Chapman and Smail.

Redshift and cosmological context

The spectroscopic redshift places the source during the peak epoch of cosmic star formation described in census work by Madau and Dickinson and connects to large-scale structure traced by surveys like the Sloan Digital Sky Survey (SDSS) and the Two Micron All Sky Survey (2MASS). Its epoch corresponds to galaxy assembly and dark matter halo growth modeled in Lambda Cold Dark Matter frameworks developed by Peebles and Blumenthal and implemented in cosmological simulations such as Millennium and Illustris. The object's infrared luminosity function contribution was assessed relative to deep field campaigns like GOODS, COSMOS, and CANDELS organized by teams at STScI and ESA.

Modeling and simulations

Interpretation combined radiative transfer codes such as RADMC-3D and DESPOTIC with hydrodynamic simulations from GADGET and AREPO developed by Springel and collaborators, and with subgrid star-formation prescriptions calibrated against FIRE and EAGLE simulation suites. Lensing inverse methods adopted Bayesian techniques popularized by Jullo and Marshall, while molecular excitation analyses used LVG and PDR models from Kaufman and Wolfire. These combined approaches constrained physical scales accessible only via lensing, informing sub-kiloparsec feedback, turbulence, and cloud fragmentation scenarios explored in work by Krumholz, McKee, and Ostriker.

Category:Submillimetre galaxies Category:Gravitationally lensed galaxies Category:Starburst galaxies Category:Aquarius (constellation)