PAPER / ARXIV:2609.19687
Yoshihisa Asada , Marcin Sawicki , Guillaume Desprez , Jon Judez , Marusa Bradac , Kartheik Iyer , Nicholas S. Martis , Adam Muzzin , Gael Noirot , Ghassan T. E. Sarrouh , Chris J. Willott , Jacqueline Antwi-Danso , Seiji Fujimoto , Danilo Marchesini , Vladan Markov , Luke Robbins , Visal Sok
RESUMO
We report JWST observations of a $z_{\rm spec}=5.196$ compact group of three strongly lensed low-mass galaxies ($M_\star \sim 10^{6-7} M_\odot$ each) whose small line-of-sight velocity offsets (from $-120\pm100$ to $+160\pm110$ km s$^{-1}$) and projected separations ($\sim2$ kpc) suggest that they are undergoing merging. On the basis of abundance-matching arguments, the trio appear to be destined to evolve into a Milky Way-mass galaxy by the present day. Our spectrophotometric analysis suggests that the stellar mass growth of this system is not simply just due to the merging of its components; rather, it is being dramatically enhanced by intense bursts of star formation. Presumably initiated by tidally-induced gas inflows, these star-forming bursts boost the mass growth $2.6\pm0.5$ times that expected in straightforward merging of the existing stellar masses. These spectroscopic observations thus not only demonstrate that hierarchical assembly remains a viable formation channel in the early assembly phases of present-day massive galaxy, but also that interaction-induced bursts of star formation are a major accelerator of this assembly process.
NO MESMO MAPA