ItemArticle

Unveiling the bulge-disc structure, AGN feedback, and baryon landscape in a massive spiral galaxy with Mpc-scale radio jets

Title
Unveiling the bulge-disc structure, AGN feedback, and baryon landscape in a massive spiral galaxy with Mpc-scale radio jets
Creator
Bagchi, Joydeep; Ray, Shankar; Dhiwar, Suraj; Pandge, Mahadev B; Dabhade, Pratik; Barth, Aaron J; Ho, Luis C; Mirakhor, Mohammad S; Walker, Stephen A; Nesvadba, Nicole; Combes, Francoise; Fabian, Andrew; Jacob, Joe
Description
We study the bulge-disc components and stellar mass distribution in the fast-rotating, highly massive spiral galaxy 2MASX J23453268-0449256, which is distinguished by extraordinary radio jets extending to Mpc scales. Using high-resolution multiwavelength Hubble Space Telescope (HST) observations and multiparameter panchromatic spectral energy distribution (SED) fitting, we derive estimates of key properties, such as the star formation rate, total baryonic mass in stars, and the characteristics of warm dust. Our findings, validated at a spatial resolution of approximately 100 pc, reveal a pseudo-bulge rather than a classical bulge, as well as a small nuclear bar and resonant ring, challenging traditional models of galaxy formation. Furthermore, the absence of tidal debris and the highly symmetric spiral arms within a rotationally supported stellar disc suggest a peaceful co-evolution of the galactic disc and its central supermassive black hole (SMBH). Notably, the galaxy exhibits suppressed star formation in its central region, which may be influenced by feedback from the central accreting SMBH, producing powerful radio jets. Detailed multiwavelength studies of potential star-forming gas show that while hot X-ray gas cools in the galaxy's halo, new stars do not form in the centre, likely due to this feedback. This study raises important questions about the efficient fuelling and sustained collimated jet activity in J2345-0449, highlighting the need for a better understanding of the central black hole's properties. The exceptional rarity of galaxies like 2MASX J23453268-0449256 presents intriguing challenges in uncovering the physical processes behind their unique characteristics. 2025 The Author(s).
Source
Monthly Notices of the Royal Astronomical Society;Volume;538;Issue;3;pp.1628-1652
Date
01-01-2025
Publisher
Oxford University Press
Subject
galaxies: formation; galaxies: fundamental parameters; galaxies: individual: 2MASX J23453268-0449256; galaxies: ISM; galaxies: spiral
Coverage
Bagchi J., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Road, Bengaluru, 560029, India; Ray S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Road, Bengaluru, 560029, India; Dhiwar S., Inter-University Centre for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune, 411007, India, Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune, 411007, India; Pandge M.B., Department of Physics and Electronics, Dayanand Science College, Barshi Road, Latur, 413512, India; Dabhade P., Instituto de Astrofica de Canarias, Calle V Ltea, s/n, E-38205, La Laguna, Tenerife, Spain, Departamento de Astrofisica, Universidad de la Laguna (ULL), Tenerife, E-38206, Spain, Astrophysics Division, National Centre for Nuclear Research, Pasteura 7, Warsaw, PL-02-093, Poland; Barth A.J., Department of Physics and Astronomy, University of California, 4129 Frederick Reines Hall, Irvine, 92697-4575, CA, United States; Ho L.C., Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, 100871, China, Department of Astronomy, School of Physics, Peking University, Beijing, 100871, China; Mirakhor M.S., Department of Physics and Astronomy, University of Alabama in Huntsville, 301 Sparkman Drive, Huntsville, 35899, AL, United States; Walker S.A., Department of Physics and Astronomy, University of Alabama in Huntsville, 301 Sparkman Drive, Huntsville, 35899, AL, United States; Nesvadba N., Institut d'Astrophysique Spatiale, Centre Universitaire d'Orsay, Orsay, F-91405, France; Combes F., LERMA, Observatoire de Paris, PSL Research University, College de France, CNRS, Sorbonne University, Paris, 75006, France; Fabian A., Institute of Astronomy, Cambridge University, Madingly Road, Cambridge, CB3 0HA, United Kingdom; Jacob J., Department of Physics, Newman College, Idukki District, Kerala, Thodupuzha, 685585, India
Rights
All Open Access; Gold Open Access; Green Open Access
Relation
ISSN: 358711; CODEN: MNRAA
Format
online
Language
English
Type
Article

Citation

Bagchi, Joydeep; Ray, Shankar; Dhiwar, Suraj; Pandge, Mahadev B; Dabhade, Pratik; Barth, Aaron J; Ho, Luis C; Mirakhor, Mohammad S; Walker, Stephen A; Nesvadba, Nicole; Combes, Francoise; Fabian, Andrew; Jacob, Joe, “Unveiling the bulge-disc structure, AGN feedback, and baryon landscape in a massive spiral galaxy with Mpc-scale radio jets,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22821.

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