preprintMonthly Notices of the Royal Astronomical SocietyFeb 17, 2026GOLD OA

GA-NIFS: interstellar medium properties and tidal interactions in the evolved massive merging system B14-65666 at z = 7.152

GCGareth C. JonesRAR. A. A. BowlerAJAndrew J. BunkerMCMirko CurtiSASantiago Arribas

University of Cambridge · University of Oxford · +10 more institutions

Indexed inarxivcrossrefdatacitedoaj

Abstract

ABSTRACT We present JWST/NIRSpec IFU observations of the $z=7.152$ galaxy system B14-65666, as part of the GA-NIFS survey. Line and continuum emission in this massive system ($\log _{10}(M_*/{\rm M}_{\odot })=9.8\pm 0.2$) is resolved into two strong cores surrounded by diffuse emission, as seen in recent JWST/NIRCam imaging. Our data set contains detections of [O ii]$\lambda \lambda 3726{,}3729$, [Ne iii]$\lambda \lambda 3869{,}3968$, Balmer lines, [O iii]$\lambda \lambda 4959{,}5007$, He i$\lambda 5875$, and weak [O iii]$\lambda 4363$. Each spectrum is fit with a model that consistently incorporates interstellar medium conditions (i.e. electron temperature, $T_{\rm e}$, electron density, $n_{\rm e}$, and…

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Topics & keywords

Topics
Keywords
  • Interstellar medium
  • Physics
  • Astrobiology
  • Astrophysics
  • Galaxy
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