IIAP Publications: Recent submissions

  • Redshift ∼2.7 is not special comment on the Kolmogorov analysis of JWST deep survey galaxies 
    Joseph, P (EDP Sciences, 2025-09)
    Galikyan et al. (2025, A&A, 696, L21) reported a statistically significant change in galaxy spectral properties at redshift z ' 2.7 based on a Kolmogorov Stochasticity Parameter analysis of JWST spectroscopic data of ...
  • Indian solar and heliospheric physics vision: Fundamental science to a space weather resilient society 
    Nandy, D; Pant, V; Anand, Megha; Athalathil, Jithu J; Awasthi, Arun Kumar; Bane, Kshitij; Banerjee, D; Ravindra, B; Bhaskar, Ankush; Bhattacharyya, R; Bhowmik, Prantika; Chandra, Ramesh; Chatterjee, Piyali; Chatterjee, Subhamoy; Dimri, A. P; Gokani, Sneha A; Hanasoge, S. M; Hazra, S; Jain, Rajmal; Joshi, B; Nagaraju, K; Kansabanik, Devojyoti; Karak, B. B; Kathiravan, C; Khan, Raveena; Krishnan, Hariharan; Kumar, Brajesh; Kumar, Sanjay; Kumari, Anshu; Majumdar, Satabdwa; Mayank, Prateek; Mishra, Sudheer K; Mishra, Wageesh; Mohan, Atul; Mondal, Surajit; Mugundhan, V; Narendranath, S; Oberoi, Divya; Pandya, Megha; Patel, Ritesh; Paul, Arghyadeep; Prasad, A; Sasikumar Raja, K; Rajhans, Abhishek; Ramesh, R; Saha, Chitradeep; Sankarasubramanian, K; Selvakumaran, R; Sharma, Rahul; Sharma, Rohit; Shrivastav, Arpit Kumar; Singh, Nishant; Soni, Shirsh Lata; Srivastava, Abhishek K; Srivastava, Nandita; Tripathi, Durgesh; Uddin, W; Vaidya, Bhargav; Vemareddy, P; Vichare, Geeta; Vigeesh, G; Yadav, Nitin; Yadav, V. K (Springer Nature, 2025-12)
    The Sun is the only star that harbours a planet known to host life. Our home, the Earth, and other solar system planets reside within the heliosphere – the sphere of influence of the Sun. Within this domain, the Sun’s ...
  • Short and intermediate periodicities in Ca II K plage areas as seen in Kodaikanal images for individual cycles from 14 to 22 
    Chowdhury, Partha; Priyal, M; Singh, J; Ravindra, B (Springer Nature, 2025-09)
    We analyze historical Ca II K images from the Kodaikanal Observatory (KO) spanning 1907 to 1996, encompassing Solar Cycles 14 through 22. These digitized images were processed using the Equal Contrast Technique (ECT) to ...
  • X-ray selected broad absorption line quasars in SDSS-V: BALs and non-BALs span the same range of X-ray properties 
    Hiremath, Pranavi; Rankine, Amy L; Aird, James; Brandt, W. N; Hidalgo, Paola Rodriguez; Anderson, S. F; Aydar, Catarina; Ricci, Claudio; Schneider, D. P; Vivek, M; Igo, Zsofi; Morrison, Sean; Salvato, Mara (Oxford University Press on behalf of Royal Astronomical Society, 2025-09)
    Broad absorption line (BAL) quasars are often considered X-ray weak relative to their optical/UV luminosity, whether intrinsically (i.e. the coronal emission is fainter) or due to large column densities of absorbing material. ...
  • Digital micromirror device characterization in optical band for astronomical multi-object spectrograph 
    Sriram, S; Valsan, Vineeth; Remya, B. S; Subramaniam, A; Maheswar, G (Springer Nature, 2025-10)
    The Digital Micromirror Device (DMD), a micro-electro-mechanical system (MEMS) consisting of individually controllable micromirrors, has emerged as a versatile tool for astronomical instrumentation, particularly in ...
  • Which solar latitude follows the sunspot cycle exactly? 
    Raju, K. P (American Astronomical Society, 2025-09-20)
    The large-scale convection in the Sun known as supergranulation is manifested as a network structure on the solar surface. The network cells have an average lifetime of 24 hr, a size of about 30 Mm, and a lane width of ...
  • The detection of teraelectronvolt radiation from a flat-spectrum radio quasar 
    Paliya, Vaidehi S; Bottcher, M; Wani, Kiran; Naseef Mohammed, P. N; Stalin, C. S; Sahayanathan, S; Saikia, D. J; Muneer, S (American Astronomical Society, 2025-09-20)
    The very high-energy (VHE; >100 GeV) radiation carries the signatures of the matter–energy interaction in some of the most extreme astrophysical environments. Considering broad emission line blazars, i.e., flat-spectrum ...
  • Detection of young massive white dwarfs in core-collapsed globular cluster NGC 362 
    Yadav, R. K. S; Dattatrey, Arvind K; Subramaniam, A; Rangwal, Geeta; Singh, Ravi S (American Astronomical Society, 2025-09-10)
    Core-collapsed globular clusters are ideal targets to explore the presence of stellar collision products. Here, we have studied 17 far-UV bright white dwarf (WD) members in the globular cluster NGC 362 using data obtained ...
  • Design and fabrication of a lightweight three-lens corrector system for the 2.34-m Vainu Bappu Telescope 
    Singh, Nitish; Sriram, S; Sethuram, Ramya; Yerra, Bharat Kumar; Burman, Rahuldeb; Nataraj, G; Chethan, C; Kemkar, P. M. M; Sagayanathan, K; Das, Saikat; Francis Xavier Rozario, J (Springer Nature, 2025-08)
    The Vainu Bappu Telescope (VBT) is a 2.34-m reflector, primarily supported on-axis field of view, offering high-resolution and low-to-medium resolution spectroscopic observations in its prime and Cassegrain configurations. ...
  • Current status and prospects of cosmology research in India 
    Datta, Abhirup; Choudhury, T. R; Majumdar, Suman; More, Surhud; Mukherjee, Suvodip; Souradeep, Tarun; Das, Subinoy; Adhikari, Susmita; Banerjee, Arka; Nadkarni-Ghosh, Sharvari; Jain, R. K; Khandai, Nishikanta; Murmu, Chandra Shekhar; Tripathi, Anshuman (Springer Nature, 2025-12)
    Discoveries in cosmology over the last few decades, using multi-band electromagnetic (EM) observations from radio to gamma rays, have shaped our understanding of the Universe and opened a plethora of open questions. The ...
  • Supermassive black holes and active galactic nuclei 
    Devangan, G. C; Shukla, A; Chatterjee, Ritaban; Kharb, P; Stalin, C. S; Mukherjee, Dipanjan; Joshi, Ravi; Paliya, Vaidehi S; Vivek, M; Vaidya, Bhargav; Ghosal, Bitan; Krishnan, Saikruba; Pahari, Mayukh; Hota, A; Banerjee, Biswajit; Agarwal, Sushmita (Springer Nature, 2025-12)
    Indian scientists have made significant contributions to the study of supermassive black holes (SMBH) and active galactic nuclei (AGN) through observational efforts, advanced data analysis, and theoretical modelling and ...
  • Orbits and vertical height distribution of 4006 open clusters in the galactic disk using Gaia DR3 
    Rangwal, Geeta; Arya, Aman; Subramaniam, A; Singh, K. P; Liu, Xiaowei (Springer Nature, 2025-12)
    Open clusters (OCs) in the Galaxy are excellent probes for tracing the structure and evolution of the Galactic disk. We present an updated catalog of the fundamental and kinematic parameters for 1145 OCs, estimated using ...
  • Stromgren photometric metallicity map of the magellanic cloud stars using Gaia DR3–XP spectra 
    Omkumar, Abinaya O; Cioni, Maria-Rosa L; Subramanian, S; de Bruijne, Jos; Nair, Aparna; Dias, Bruno (EDP Sciences, 2025-08)
    Context. One key to understanding a galaxy’s evolution is studying the consequences of its past dynamical interactions that have influenced its shape. By measuring the metallicity distribution of stellar populations with ...
  • Constraining the nature and long-term stability of FRB 20121102A’s persistent radio source 
    Bhardwaj, Mohit; Balasubramanian, Arvind; Kaushal, Yasha; Tendulkar, Shriharsh (IOP Publishing, 2025-08)
    The persistent radio source (PRS) associated with FRB 20121102A, the first precisely localized repeating fast radio burst (FRB), provides key constraints on both its local environment and the nature of the underlying ...
  • The relation between solar spicules and magnetohydrodynamic shocks 
    Srivastava, Sankalp; Chatterjee, Piyali; Dey, Sahel; Erdelyi, Robertus (American Astronomical Society, 2025-08-10)
    Spicules are thin, elongated, jet-like features seen in observations of the solar atmosphere, at the interface between the solar photosphere and the corona. These features exhibit highly complex dynamics and are a necessary ...
  • Photospheric helium abundance in cool giants: a comprehensive study 
    Hema, B. P; Pandey, G (American Astronomical Society, 2025-08-20)
    High-resolution optical spectra of 16 red giants, two early asymptotic giant branch (AGB) stars, and two supergiants, having no/minimal - to super-lithium (Li)-rich abundances, are analyzed to investigate the helium ...
  • Dynamical signatures of trumpler 19: a statistical and photometric perspective 
    Sheikh, A. H; Medhi, B. J; Sagar, R (American Astronomical Society, 2025-08-10)
    We present a statistical approach to investigating the dynamical evolution of the old open cluster Trumpler 19. We identified 810 cluster members using an ensemble-based unsupervised machine learning method applied to Gaia ...
  • UVIT Study of the Magellanic Clouds (U-SMAC). III. hierarchical star formation in the small magellanic cloud regulated by turbulence 
    Hota, Sipra; de Grijs, R; Subramaniam, A (American Astronomical Society, 2025-08-20)
    The Small Magellanic Cloud (SMC), a satellite galaxy of the Milky Way, is an irregular dwarf galaxy exhibiting evidence of recent and ongoing star formation. We performed a spatial clustering analysis of far-ultraviolet ...
  • Radio morphology of gamma-ray sources. II. giant radio galaxies 
    Paliya, Vaidehi S; Saikia, D. J; Bruni, G; Dominguez, Alberto; Stalin, C. S (American Astronomical Society, 2025-08-10)
    Giant radio sources, including galaxies and quasars (hereafter GRSs), are active galactic nuclei (AGN) hosting relativistic jets with source sizes exceeding a projected length of 0.7 Mpc. They are crucial to understanding ...
  • The CatSouth Quasar candidate catalog for the southern sky and a unified all-sky catalog based on Gaia DR3 
    Fu, Yuming; Wu, Xue-Bing; Bouwens, R. J; Caputi, Karina I; Pang, Yuxuan; Zhu, Rui; Yang, Da-Ming; Qin, Jin; Wang, Huimei; Wolf, Christian; Li, Yifan; Joshi, Ravi; Zhang, Yanxia; Huo, Zhi-Ying; Ai, Y. L (American Astronomical Society, 2025-08)
    The Gaia DR3 has provided a large sample of more than 6.6 million quasar candidates with high completeness but low purity. Previous work on the CatNorth quasar candidate catalog has shown that including external multiband ...

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