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publications
J021659-044920: a relic giant radio galaxy at z ∼ 1.3
Published in Monthly Notices of the Royal Astronomical Society, 2015
This paper is about the discovery of a relic giant radio galaxy. We studies the radio lobe properties and estimated their age, magnetic field strength.
Recommended citation: Tamhane, P.D. et. al, (2015). "J021659-044920: a relic giant radio galaxy at z ∼ 1.3." MNRAS. 453. https://academic.oup.com/mnras/article/453/3/2438/1078675
Origins of Molecular Clouds in Early-type Galaxies
Published in The Astrophysical Journal, 2019
In this paper we show that the molecular gas in early type galaxies most likely originates from cooling of the hot gas in their atmospheres, and that the thermodynamic properties of early type galaxies are similar to that of cluster center galaxies.
Recommended citation: Babyk, Iu. V., McNamara, B. R., Tamhane, P. D. et. al. (2019). "Origins of Molecular Clouds in Early-type Galaxies." ApJ. 887. https://iopscience.iop.org/article/10.3847/1538-4357/ab54ce
Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters
Published in The Astrophysical Journal, 2020
In this paper we studied clusters with low atmospheric cooling time but no warm/cold gas. We propose that the clusters lack cold gas because their central radio jets fail to lift low-entropy gas to large altitudes.
Recommended citation: C. G. Martz, B. R. McNamara, P. E. J. Nulsen, A. N. Vantyghem, M-J. Gingras, Iu. V. Babyk, H. R. Russell, A. C. Edge, M. McDonald, P. D. Tamhane et. al, (2020). "Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters." ApJ. 897. https://iopscience.iop.org/article/10.3847/1538-4357/ab96cd
Molecular Flows in Contemporary Active Galaxies and the Efficacy of Radio-Mechanical Feedback
Published in Monthly Notices of the Royal Astronomical Society, 2022
We studied molecular flows in brightest cluster galaxies (BCGs) and compared them with molecular flows in early type galaxies. Molecular flows in BCGs powered by radio-mechanical feedback are larger, heavier and slower. We found that radio feedback is generally more effective at lifting gas in galaxies compared to quasars and starburst winds. Star formation in BCGs is quenched compared to other galaxies.
Recommended citation: Prathamesh D. Tamhane, Brian R. McNamara, Helen R. Russell, Alastaire C. Edge, Andrew C. Fabian, Paul E. J. Nulsen, Iurii V. Babyk et. al, (2022). "Molecular Flows in Contemporary Active Galaxies and the Efficacy of Radio-Mechanical Feedback." MNRAS, Volume 516, Issue 1. https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stac2168/6653098
Radio jet-ISM interaction and positive radio-mechanical feedback in Abell 1795
Published in Monthly Notices of the Royal Astronomical Society, 2023
We studied the positive radio mechanical feedback and the interaction between radio jets and the interstellar medium in the brightest cluster galaxy of the Abell 1795 galaxy cluster. We found that radio-jet triggered star formation has a lower efficiency compared to the efficiency of star formation in the central regions of nearby spiral galaxies.
Recommended citation: Prathamesh D. Tamhane, Brian R. McNamara, Helen R. Russell, Francoise Combes, Yu, Qiu, Alastair C. Edge, Roberto Maiolino, Andrew Fabian, Paul E. J. Nulsen, R. Johnstone, Stefano Carniani, (2022). "Radio jet-ISM interaction and positive radio-mechanical feedback in Abell 1795." MNRAS, Volume 519, Issue 3. https://academic.oup.com/mnras/article-abstract/519/3/3338/6965357?redirectedFrom=fulltext
A massive multiphase plume of gas in Abell 2390’s brightest cluster galaxy
Published in Monthly Notices of the Royal Astronomical Society, 2024
We studied the origin of massive (>10^10 solar masses) molecular gas plume in Abell 2390 brightest cluster galaxy also observed in the X-ray and optical wavelengths. We discuss different mechanisms that could have led to the formation of the plume based on its observed properties. We also report detection of molecular gas absorption against the nucleus and somple models to explain its origin.
Recommended citation: Rose, Tom; McNamara, B. R.; Combes, F.; Edge, A. C.; Russell, H.; Salomé, P.; Tamhane, P. ; Fabian, A. C.; Tremblay, G., (2024). "A massive multiphase plume of gas in Abell 2390s brightest cluster galaxy." MNRAS. https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stae213/7581997
research
Research
Molecular flows in Brightest Cluster Galaxies
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talks
Molecular gas flows in active galaxies and the potential impact of radio-mechanical feedback
Published:
I talked about our analysis of molecular gas flows in 14 brightest cluster galaxies. Comparing molecular flows in BCGs to those in other nearby AGN and starburst galaxies, we found that flows in BCGs are larger, heavier and slower. The lifting factor in BCGs is higher than other AGN indicating that the radio-mechanical feedback is more effective. It can also suppress star formation in BCGs.
Radio-jet triggered star formation in a molecular gas flow
Published:
I attended the Star formation in the era of JWST conference in Greece, where I discussed my work on star formation in the molecular gas filament in the central galaxy of the Abell 1795 cluster. The BCG has ~7-10 kpc long molecular gas filaments with bright UV emission indicative of star formation wrapped around radio jets emanating from the central AGN. I presented my results on the interaction between radio jets and the gas, the nature and efficiency of star formation and the role of turbulence.
Fantastic Beasts: Active Galactic Nuclei in Galaxies and Clusters
Published:
I had the pleasure of speaking at the Astronomy on Tap (AoT) event in Huntsville. AoT is a fantastic science outreach program that brings together astronomers and space enthusiasts in informal settings like bars, cafes, and similar venues. These events happen in cities all around the world, where local astronomers share talks, discussions, and presentations on various astronomy topics in a relaxed and engaging way that’s accessible to everyone, regardless of their background.
The impact of gas uplift by cavities in mechanical AGN feedback
Published:
I recently had the honor of speaking at the McNamara@65 conference at the University of Waterloo in Canada. This event celebrated the 65th birthday of my PhD supervisor, Prof. Brian McNamara, and his significant contributions to astronomy.
teaching
ECE105
Undergraduate course, University of Waterloo, 2018
Conducted tutorials for the course, graded student’s assignments and exams, held office hours.
PHY112L
Undergraduate lab course, University of Waterloo, 2022
Instructed undergraduate Physics lab sessions.