IIA Institutional Repository: Recent submissions

  • ALMA-QUARKS view of W49N: Multipolar episodic outflow associated with the most energetic galactic water maser 
    Jiao, Yunfan; Liu, Tie; Jiao, Wenyu; Xu, Feng-Wei; Gu, Qilao; Tang, Xindi; Mai, Xiaofeng; Luo, Qiuyi; Zhang, Siju; Goldsmith, Paul F; Lee, Chang Won; Garay, Guido; Yang, Yuhan; Gorai, Prasanta; Merello, Manuel; Garcia, Pablo; Dib, S; Hwang, Jihye; Hoque, Ariful; Juvela, Mika; Zhang, Yankun; Sanhueza, Patricio; Weng, Jixiang; Kim, Kee-Tae; Das, Swagat; Archana Soam; Baug, Tapas; Zhou, Jianjun; Bronfman, Leonardo; Yang, A.Y; Zhu, Lei (American Astronomical Society, 2026-07)
    We present a detailed investigation of a multipolar episodic molecular outflow in the ministarburst region W49N, which hosts the most luminous water maser in the Galaxy. Using high-resolution ( ∼0.″3 ) Atacama Large ...
  • Future null energy violation and minimal dark energy solutions to the Hubble tension 
    Manoharan, Manosh T (Elsevier B. V, 2026-07)
    Few phenomenological extensions of ΛCDM favour higher values of the Hubble parameter without introducing additional degrees of freedom, often at the cost of invoking phantom dynamics. We investigate ─ Phenomenological ...
  • Broad-band spectral and temporal study of OP 313 during its 2025 January very high energy flare 
    Manzoor, Aaqib; Ahanger, Sajad; Shah, Zahir; Vivek, M; Malik, Zahoor (Elsevier B.V, 2026-07)
    We present a comprehensive broadband temporal and spectral analysis of the transition blazar OP 313 using Swift and Fermi-LAT observations obtained during its recent very high energy (VHE) flaring activity. The one-day ...
  • Ultraviolet variability in radio-loud active galactic nuclei observed by UVIT onboard AstroSat 
    Reshma, M; Stalin, C. S; Mandal, A. K; Gudennavar, S. B; Benedict, Senorita; Joseph, P (Elsevier B.V., 2026-07)
    Radio-loud active galactic nuclei (AGN) are among the most luminous objects in the Universe, emitting radiation from low-energy radio waves to high energy γ-rays. They are well known to exhibit flux variations at nearly ...
  • Narrow-line Seyfert 1 galaxies in the dark energy spectroscopic instrument data release 1 
    Paliya, Vaidehi S; Rakshit, S; Dominguez, Alberto; Saikia, D. J; Stalin, C. S (American Astronomical Society, 2026-07)
    Narrow-line Seyfert 1 (NLSy1) galaxies are peculiar active galactic nuclei (AGN) known to exhibit a variety of intriguing observational features from low-frequency radio waves to high-energy γ-rays. As of now, NLSy1 catalogs ...
  • A 14-yr-old mystery: The peculiar case of the engine-driven SN 2012ap 
    Sfaradi, Itai; Margutti, R; Chornock, R; Nayana, A. J; Wiston, Eli; De Colle, Fabio; Clarke, T. E; Peters, Wendy M; Beniamini, Paz; Lu, Wenbin; Duran, Rodolfo Barniol; Bietenholz, M; Christy, Collin T; Coppejans, D. L; Drout, Maria R; Ibrahimzade, Dina; Michałowski, M. J; Milisavljevic, D; Omand, Conor M. B; Wang, Yihan; Alexander, Kate D; Badenes, Carles; Bright, J. S; Granot, Jonathan; Hammerstein, Erica; Jacobson-Galan, W. V; LeBaron, Natalie; Murase, Kohta; Rameshan, Gitika; Sears, Huei; Stroh, Michael; Terreran, Giacomo (American Astronomical Society, 2026-07-01)
    We present late-time (δt > 3000 days) optical (Keck), X-ray (Chandra and the Nuclear Spectroscopic Telescope Array), and radio (the Very Large Area, the Atacama Large Millimeter/submillimeter Array, and the Upgraded Giant ...
  • Early dark energy beyond slow-roll: Implications for cosmic tensions 
    Sharma, Ravi Kumar; Das, Subinoy; Poulin, Vivian (American Physical Society, 2024-02-15)
    In this work, we explore the possibility that early dark energy (EDE) is dynamical in nature and study its effect on cosmological observables. We introduce a parametrization of the equation of state allowing for an equation ...
  • Three-phase evolution of aspect ratio in fast and slow CMEs from the Sun to 1 au 
    Mishra, Wageesh; Agarwal, Anjali; Srivastava, N (Oxford University Press on behalf of Royal Astronomical Society, 2026-07)
    Coronal mass ejections (CMEs) undergo significant geometric evolution as they propagate from the Sun to 1 au, influencing their radial size, expansion, and space weather impact. We investigate the evolution of CME aspect ...
  • Designing a sky-scanning Fabry–Perot interferometer system with a large size integrating sphere 
    Mahavarkar, Prasanna; Sriram, S; Joshi, Bhagyashree; Hasan, Amirul; Remya, B. S; Chandra, Sarvesh (Elsevier B.V., 2023-12)
    Integrating spheres can be manufactured at sizes ranging from 1 mm to 3 m in diameter. It has been agreed widely by manufacturers that fitting a large-sized integrating sphere as per the customer requirement is a complex ...
  • Chemodynamic studies of the galaxy 
    Deepak (Indian Institute of Astrophysics, 2022-04)
    Based on data from large spectroscopic surveys like the GALactic Archaeology with HERMES (GALAH) and the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST), along with astrometric and photometric data from ...
  • Three extremely metal-poor stars: Discovery of a new CEMP-no star 
    Goswami, P. P; Goswami, A (Oxford University Press on behalf of Royal Astronomical Society, 2026-07)
    We have conducted detailed high-resolution spectroscopic studies on three extremely metal-poor (EMP) stars HE 0401−0138, HE 1153−0518, and HE 1246−1344. For the stars HE 0401−0138 and HE 1246−1344, we have estimated the ...
  • Probing spectral variability in NGC 4490 ULX-8 over 24 yr of XMM–Newton, Chandra, and Swift-XRT observations 
    Vashisht, Tarang; Beri, Aru; Ghosh, Tanuman; Upadhyay, Aman; Rana, Vikram (Oxford University Press on behalf of the Royal Astronomical Society, 2026-07)
    We present a spectral variability study of the ultraluminous X-ray source NGC 4490 ULX-8 based on 14 Chandra, 6 XMM– Newton, and 19 Swift-XRT observations obtained between 2000 and 2024. The X-ray spectra are modelled using ...
  • High-precision K2/TESS photometry and HERMES spectroscopy of four bright field stars 
    Trust, Otto; Joshi, S; Nsamba, Benard; Aol, Sharon; Vermeulen, Owen; Ssembatya, Ronald; De Cat, P; Lampens, P; Barnes, Sydney A; Goswami, P. P; Dileep, Athul; Ghosh, S. C; Kumar, Pramod; Jurua, E; Sarkar, M; Bedi, Sarabjeet S (Oxford University Press on behalf of the Royal Astronomical Society, 2026-07)
    Space-based photometry from K2 and TESS, coupled with high-resolution spectroscopy, provides a unique opportunity to re-examine the variability and chemical nature of four brightstars(HD 73135, BD +19◦ 2045, BD +19◦ 2046, ...
  • A consistency check for the calibration of 5303Å solar coronal emission line observations with Aditya-L1/VELC 
    Priyal, M; Ramesh, R; Singh, J; Sasikumar Raja, K; Savarimuthu, P (Springer Nature, 2026-06)
    We carried out radiometric calibration of the Visible Emission Line Coronagraph (VELC) onboard Aditya-L1 at 5303Å using observations of the Sun itself, a novel approach compared to the calibration using bright stars in the ...
  • Dwarf and intermediate-mass galaxies in MaNGA: Evidence for different evolutionary trends 
    Chandan, Watts; Gothai, L; Barway, Sudhanshu (American Astronomical Society, 2026-06-20)
    We investigate the interplay between morphology, specific star formation rate (sSFR), and local environment using a sample of 7408 galaxies from the fourth-generation Sloan Digital Sky Survey Mapping Nearby Galaxies at ...
  • The VMC survey: LV. the coherent expansion of the SMC 
    Vijayasree, S; Niederhofer, Florian; Cioni, Maria-Rosa L; van Loon, Jacco Th; Bekki, K; de Grijs, R; Subramanian, S; Kacharov, N; Omkumar, Abinaya O; Cullinane, L. R; Ivanov, Valentin D (EDP Sciences, 2026-06)
    Context. The Small Magellanic Cloud (SMC) exhibits significant kinematic disequilibrium due to interactions with the Large Magellanic Cloud (LMC). Aims. Here, we investigate the two-dimensional stellar kinematics of the ...
  • Detection of an optical quasiperiodic oscillation in the Blazar 3C 454.3 
    Dogra, Karan; Gupta, A. C; Raiteri, C. M; Villata, M; Wiita, P. J; Valtonen, Mauri J; Kurtanidze, S. O; Jorstad, S; Bachev, R; Damljanovic, G; Lorey, C; Savchenko, S. S; Vince, O; Abdelkareem, M; Aceituno, F. J; Acosta-Pulido, J. A; Agudo, I; Andreuzzi, G; Ata, S. A; Baida, G. V; Barbieri, L; Blinov, D; Bonnoli, G; Borman, G. A; Carnerero, M. I; Carosati, D; Casanova, V; Chen, W. P; Cui, Lang; Devanand, P. U; Elhosseiny, E. G; Elsaesser, D; Escudero, J; Fan, J. H; Feige, M; Gazeas, K; Grishina, T. S; Gu, Minfeng; Hagen-Thorn, V. A; Hemrich, F; Hsiao, H. Y; Ismail, M; Ivanidze, R. Z; Jovanovic, M. D; Kamel, T. M; Kimeridze, G. N; Kishore, Shubham; Kopatskaya, E. N; Kuberek, D; Kurtanidze, O. M; Kurtenkov, A; Larionov, V. M; Larionova, Elena G; Larionova, L. V; Lin, H. C; Marchini, A; Marinelli, C; Marscher, A; Morcuende, D; Morozova, D. A; Nazarov, S. V; Nikolashvili, M. G; Reinhart, D; Otero-Santos, J; Scherbantin, A; Semkov, E; Shishkina, E. V; Sigua, L. A; Singh, Ajay Kumar; Sota, A; Steineke, R; Stojanovic, M; Strigachev, A; Takey, Ali; Tawfeek, Amira A; Tripathi, Tushar; Troitskiy, I. S; Troitskaya, Y. V; Tsai, An-Li; Vasilyev, A. A; Vrontaki, K; Zhang, Zhongli; Zhovtan, A. V; Zottmann, N; Zuo, Wenwen (American Astronomical Society, 2026-06-01)
    We analyzed 19 yr of R-band data of the blazar 3C 454.3 from the Whole Earth Blazar Telescope archive, along with new data from its members and from public archives such as those provided by the Small and Moderate Aperture ...
  • A unique application of the observation of stars in Indian astronomical texts 
    Shylaja, B. S; Shubha, B. S (National Astronomical Research Institute of Thailand, 2024-09)
    It is very well known that the observation of stars constituted an integral part of Indian astronomical texts. The twenty seven stars along the zodiac were used as references for longitudes. Here we discuss an application ...
  • Variable stars in the field of the galactic globular cluster M71 
    Cortes, C. C; Deras, D; Ferro, A. A; Muneer, S; Fierro, Bustos (Oxford University Press on behalf of Royal Astronomical Society, 2026-06)
    M71 is a nearby, metal-rich globular cluster at low Galactic latitude, where field contamination and spatially variable extinction complicate colour─magnitude diagrams (CMDs) and the identification of cluster member variable ...
  • Observations of circularly polarized radio emission from the "Quiet" sun at frequencies <100 MHz 
    Sayuf, Shaik; Kathiravan, C; Ramesh, R; Barve, Indrajit V; Gireesh, G. V. S; Bane Kshitij, Suhas Trupti (American Astronomical Society, 2026-06-10)
    The presence of the magnetic field makes the solar coronal medium birefringent. Research indicates that an appreciable degree of circular polarization (DCP) can be observed in the thermal radio emission at frequencies <100 ...

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