Data from paper: RUBIES: JWST/NIRSpec Confirmation of an Infrared-luminous, Broad-line Little Red Dot with an Ionized Outflow

The JWST discovery of ``little red dots'' (LRDs) is reshaping our picture of the early Universe, yet the physical mechanisms driving their compact size and UV-optical colors remain elusive. Here we report an unusually bright LRD ($\zspec=3.1$) observed as part of the RUBIES program. This LRD exhibits broad emission lines (FWHM$\sim4000\,\kms$), a blue UV continuum, a clear Balmer break and a red continuum sampled out to rest-frame 4~$\mu\mathrm{m}$ with MIRI. We develop a new joint galaxy and active galactic nucleus (AGN) model within the \texttt{Prospector} Bayesian inference framework and perform spectrophotometric modeling using NIRCam, MIRI, and NIRSpec/Prism observations. Our fiducial model reveals a $M_*\sim 10^9~\msun$ galaxy alongside a dust-reddened AGN driving the optical emission. Explaining the rest-frame optical color as a reddened AGN requires $\Av \gtrsim 3$, suggesting that a great majority of the accretion disk energy is re-radiated as dust emission. Yet, despite clear AGN signatures, we find a surprising lack of hot torus emission, which implies that either the dust emission in this object must be cold, or the red continuum must instead be driven by a massive, evolved stellar population of the host galaxy---seemingly inconsistent with the high EW broad lines (H$\alpha$ rest-frame EW $\sim 800$~\AA). The widths and luminosities of Pa-$\beta$, Pa-$\delta$, Pa-$\gamma$, and H$\alpha$ imply a modest black hole mass of $M_{\rm BH}\sim10^8$ M$_{\odot}$. Additionally, we identify a narrow blue-shifted \he\,$\lambda\,1.083\,\mu$m absorption feature in NIRSpec/G395M spectra, signaling an ionized outflow with kinetic energy up to $\sim 1$\% the luminosity of the AGN. The low redshift of RUBIES-BLAGN-1 combined with the depth and richness of the JWST imaging and spectroscopic observations provide a unique opportunity to build a physical model for these so-far mysterious LRDs, which may prove to be a crucial phase in the early formation of massive galaxies and their supermassive black holes.