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We present Hubble Space Telescope (HST) observations of the nearby, massive,highly rotating hybrid galaxy UGC~12591, along with observations in UV to FIRbands. HST data in V, I, and H bands is used to disentangle the structuralcomponents. Surface photometry shows a dominance of the bulge over the discwith H-band B/D ratio of $69\%$. The spectral energy distribution (SED) fittingreveals an extremely low global star formation rate (SFR) of $\rm\sim0.1-0.2M_\odot yr^{-1}$, exceptionally low for the galaxy's huge stellar mass of $\rm1.6\times10^{11}M_\odot$, implying a strong quenching of its SFR with starformation efficiency of $3-5\%$. For at least the past $\rm 10^{8}$ years, thegalaxy has remained in a quiescent state as a sterile, `red and dead' galaxy.UGC~12591 hosts a supermassive black hole (SMBH) of $\rm 6.18\times 10^{8}M_\odot$ which is possibly quiescent at present, i.e. neither we see large($\rm>1 kpc$) radio jets nor is the SMBH contributing significantly to themid-IR SED, ruling out strong radiative feedback of AGN. We obtained a detailedcensus of all observable baryons with a total mass of $\rm 6.46\times10^{11}M_\odot$ within the virial radius, amounting to a baryonic deficiency of$\sim$$85\%$ relative to the cosmological mean. Only a small fraction of thesebaryons resides in a warm/hot circum-galactic X-ray halo, while the majorityare still unobservable. We discussed various astrophysical scenarios to explainits unusual properties. Our work is a major step forward in understanding theassembly history of such extremely massive, isolated galaxies.

monthly notices of the royal astronomical society

Hubble Space Telescope Captures UGC~12591: Bulge/Disc Properties, Star  Formation and `Missing Baryons' Census in a Very Massive and Fast Spinning  Hybrid Galaxy