Hubble Space Telescope Captures UGC 12591: Bulge/disc properties, star formation and 'missing baryons' census in a very massive and fast-spinning hybrid galaxy
- Title
- Hubble Space Telescope Captures UGC 12591: Bulge/disc properties, star formation and 'missing baryons' census in a very massive and fast-spinning hybrid galaxy
- Creator
- Ray S.; Bagchi J.; Dhiwar S.; Pandge M.B.; Mirakhor M.; Walker S.A.; Mukherjee D.
- Description
- We present Hubble Space Telescope ( HST ) observations of the nearby, massive, highly rotating hybrid galaxy UGC 12591, along with observations in the UV to FIR bands. HST data in V , I , and H bands is used to disentangle the structural components. Surface photometry shows a dominance of the bulge o v er the disc with an H-band B / D ratio of 69 per cent . The spectral energy distribution (SED) fitting reveals an extremely low global star formation rate (SFR) of 0 . 1-0 . 2 M yr-1 , exceptionally low for the galaxy's huge stellar mass of 1 . 6 0 11 M, implying a strong quenching of its SFR with a star formation efficiency of 3-5 per cent. For at least the past 10 8 yr, the galaxy has remained in a quiescent state as a sterile, 'red and dead' galaxy. UGC 12591 hosts a supermassive black hole (SMBH) of 6 . 18 0 8 M, which is possibly quiescent at present, i.e. we neither see large (1kpc) radio jets nor the SMBH contributing significantly to the mid-IR SED, ruling out strong radiative feedback of AGN. We obtained a detailed census of all observable baryons with a total mass of 6 . 46 0 11 M within the virial radius, amounting to a baryonic deficiency of 85 per cent relative to the cosmological mean. Only a small fraction of these baryons reside in a warm/hot circumgalactic X-ray halo, while the majority are still unobservable. We discussed various astrophysical scenarios to explain its unusual properties. Our work is a major step forward in understanding the assembly history of such e xtremely massiv e, isolated galaxies. 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-517, No. 1, pp. 99-117.
- Date
- 2022-01-01
- Publisher
- Oxford University Press
- Subject
- galaxies: individual: UGC12591; galaxies: ISM; galaxies: spiral; Galaxy: formation; Galaxy: fundamental parameters
- Coverage
- Ray S., Dayanand Science College, Latur, 413531, India, Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Road, Bengaluru, 560029, India; Bagchi J., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Road, Bengaluru, 560029, India; Dhiwar S., Dayanand Science College, Latur, 413531, India, Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India, Savitribai Phule Pune University, Pune, 411007, India; Pandge M.B., Dayanand Science College, Latur, 413531, India; Mirakhor M., The University of Alabama in Huntsville, OPB430, Huntsville, 35899, AL, United States; Walker S.A., The University of Alabama in Huntsville, OPB430, Huntsville, 35899, AL, United States; Mukherjee D., Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India
- Rights
- All Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Ray S.; Bagchi J.; Dhiwar S.; Pandge M.B.; Mirakhor M.; Walker S.A.; Mukherjee D., “Hubble Space Telescope Captures UGC 12591: Bulge/disc properties, star formation and 'missing baryons' census in a very massive and fast-spinning hybrid galaxy,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 24, 2025, https://archives.christuniversity.in/items/show/14812.