Results of the summarizing process for the arXiv paper: 2307.10115v1

In this study, the authors present the results of their observations of the lensing system SPT0418-47 using the James Webb Space Telescope (JWST) and the Atacama Large Millimeter/submillimeter Array (ALMA). The lensing system consists of a strongly-lensed, dusty star-forming galaxy at a redshift of z=4.225, along with an associated multiply-imaged companion. The JWST NIRCam and MIRI imaging observations were obtained as part of the Early Release Science program called TEMPLATES (Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star Formation). These observations provide robust and multiwavelength detection of stellar light in both the main galaxy (SPT0418A) and its companion (SPT0418B), confirming that they are located at the same redshift. From a source plane reconstruction, it is inferred that these two galaxies have a projected physical separation of $4.42\pm 0.05$ kiloparsecs. The authors derive total magnifications of $\mu=29.5\pm1.2$ for SPT0418A and $\mu=4.2\pm 0.9$ for SPT0418B using two different methods: CIGALE and PROSPECTOR. They also estimate the stellar masses of these galaxies; their ratio is approximately 4 to 1 ($4.5\pm 1.0$ for CIGALE and $4.2^{+1.9}_{-1.6}$ for PROSPECTOR). Additionally, extended structure associated with SPT0418A is observed in the lensing reconstruction which suggests a possible tidal feature between them; however, despite this interaction their star formation rates and stellar masses remain consistent with those expected from star-forming galaxies at this epoch indicating that it has not significantly impacted them yet.

• Study presents observations of lensing system SPT0418-47 using JWST and ALMA
• Lensing system consists of a strongly-lensed, dusty star-forming galaxy at z=4.225 and a multiply-imaged companion
• Observations confirm both galaxies are located at the same redshift
• Galaxies have a projected physical separation of $4.42\pm 0.05$ kiloparsecs
• Total magnifications derived: $\mu=29.5\pm1.2$ for SPT0418A and $\mu=4.2\pm 0.9$ for SPT0418B
• Stellar mass ratio approximately 4 to 1 ($4.5\pm 1.0$ for CIGALE and $4.2^{+1.9}_{-1.6}$ for PROSPECTOR)
• Extended structure observed suggesting possible tidal feature between the galaxies
• Despite interaction, star formation rates and stellar masses remain consistent with expectations

Exploring the Lens System SPT0418-47 with JWST and ALMA

In a recent study, researchers used the James Webb Space Telescope (JWST) and the Atacama Large Millimeter/submillimeter Array (ALMA) to observe a lensing system known as SPT0418-47. This system consists of two galaxies located at a redshift of z=4.225, which is approximately 12 billion light years away from Earth. The main galaxy in this system is called SPT0418A, while its companion is named SPT0418B.

Observations with JWST

The observations were conducted as part of an Early Release Science program called TEMPLATES (Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star Formation). These observations provided robust and multiwavelength detection of stellar light in both galaxies using JWST's NIRCam and MIRI imaging capabilities. From these images, it was determined that the two galaxies have a projected physical separation of $4.42\pm 0.05$ kiloparsecs. Additionally, extended structure associated with SPT0418A was observed in the lensing reconstruction which suggests possible tidal interaction between them; however, their star formation rates remain consistent with those expected from star-forming galaxies at this epoch indicating that it has not significantly impacted them yet.

Magnification Estimates

The authors also estimated total magnifications for each galaxy using two different methods: CIGALE and PROSPECTOR. They found that SPT0418A had a magnification of $\mu=29.5\pm1.2$, while its companion had $\mu=4.2\pm 0.9$. These results indicate that much more light from SPT0418A reaches us than from its companion due to gravitational lensing effects caused by intervening objects such as dark matter halos or clusters of galaxies along our line-of-sight to these distant objects in space..

Stellar Masses

The authors also derived estimates for the stellar masses of these two galaxies; they found that their ratio was approximately 4 to 1 ($4.5\pm 1