IIA Institutional Repository: Recent submissions

  • Revitalizing image retrieval: AI enhancement and metaheuristic algorithm adaptation 
    Kumaravel, P; Thabasu Kannan, S (European Alliance for Innovation (EAI), 2025-01-17)
    INTRODUCTION: In recent years, development of digital technology has led to number of images, which can be stored in digital format. However, searching and retrieval of images in large image DB (Database) is a mammoth task. ...
  • The solar ultraviolet imaging telescope on board Aditya-L1 
    Tripathi, Durgesh; Ramaprakash, A. N; Padinhatteeri, Sreejith; Sarkar, Janmejoy; Burse, Mahesh; Tyagi, Anurag; Kesharwani, Ravi; Sinha, Sakya; Joshi, Bhushan; Deogaonkar, Rushikesh; Roy, Soumya; Nived, V. N; Gopalakrishnan, Rahul; Kulkarni, Akshay; Khan, Aafaque; Ghosh, Avyarthana; Rajarshi, Chaitanya; Modi, Deepa; Kumar, Ghanshyam; Yadav, Reena; Varma, Manoj; Bayanna, A. R; Chordia, Pravin; Karmakar, Mintu; Abraham, Linn; Adithya, H. N; Adoni, A. A; Ahmed, Gazi A; Banerjee, D; Bhargava Ram, B. S; Bhandare, Rani; Chatterjee, Subhamoy; Chillal, Kalpesh; Dey, A; Gandorfer, Achim; Gowda, Girish; Haridas, T. R; Jain, Anand; James, Melvin K; Jayakumar, R. P; Justin, Evangeline Leeja; Nagaraju, K; Kathait, Deepak; Khodade, Pravin; Kiran, Mandeep; Kohok, A; Krivova, Natalie A; Kumar, Nishank; Mehandiratta, Nidhi; Mestry, V. B; Motamarri, Srikanth; Mustafa, Sajjade F; Nandy, D; Narendranath, S; Navle, Sonal; Parate, Nashiket; Pillai, Anju M; Punnadi, Sujit; Rajendra, A; Ravi, A; Raha, Bijoy; Sankarasubramanian, K; Sarvar, Ghulam; Shaji, Nigar; Sharma, Nidhi; Singh, Aditya; Singh, Shivam; Solanki, S. K; Subramanian, Vivek; Rethika, T; Srikanth, T; Thatimattala, Satyannarayana; Tota, Hari Krishna; Vishnu, T. S; Unnikrishnan, Amrita; Vadodariya, Kaushal; Veeresha, D. R; Venkateswaran, R (Springer Nature, 2025-03)
    The Solar Ultraviolet Imaging Telescope (SUIT) is an instrument on the Aditya-L1 mission of the Indian Space Research Organization (ISRO) launched on 2 September 2023. SUIT continuously provides near-simultaneous full-disk ...
  • Evolution of photospheric magnetic field and electric currents during the X1.6 Flare in active region NOAA 12192 
    Chowdhury, Partha; Ravindra, B; Tiwari, Sanjiv K (Springer Nature, 2025-03)
    The dynamics of magnetic fields in the Sun’s active regions play a key role in triggering solar eruptions. Studies have shown that changes in the photosphere’s magnetic field can destabilize the large-scale structure of ...
  • New JWST redshifts for the host galaxies of CDF-S XT1 and XT2: understanding their nature 
    Quirola-Vasquez, J; Bauer, Franz E; Jonker, Peter G; Levan, A; Brandt, W. N; Ravasio, M; Eappachen, D; Xue, Y. Q; Zheng, X. C (EDP Sciences, 2025-03)
    Aims. CDF-S XT1 and XT2 are considered two "canonical" extragalactic fast X-ray transients (FXTs). In this work, we report new constraints on both FXTs, based on recent JWST NIRCam and MIRI photometry, as well as NIRspec ...
  • Exploring the disc-jet scenario in 3C 273 using simultaneous XMM-Newton and NuSTAR observations 
    Pandey, Ashwani; Mondal, Santanu; Wiita, Paul J (EDP Sciences, 2025-03)
    Context. The well-studied active galactic nucleus (AGN) 3C 273 displays characteristics of both jetted-AGNs and Seyfert galaxies, which makes it an excellent source to study the disc-jet connection in AGNs. Aims. We aim ...
  • Baryonic ecosystem in galaxies (BEINGMgII): II. Unveiling the nature of galaxies harbouring cool gas reservoirs 
    Das, Sarbeswar; Joshi, Ravi; Chaudhary, Reena; Fumagalli, Michele; Fossati, Matteo; Peroux, Celine; Ho, Luis C (EDP Sciences, 2025-03)
    We search for the galaxies associated with the intervening Mg II absorbers over a redshift range of 0.4 ≤ z ≤ 1 using imaging data from DESI Legacy Imaging Surveys and measure the redshift based on the direct detection of ...
  • Broad absorption line outflows are common in low Eddington ratio active galactic nuclei 
    Vivek, M; Wylezalek, D (EDP Sciences, 2025-03)
    Context. Broad absorption line (BAL) quasars exhibit significant outflows, offering insights into active galactic nucleus (AGN) feedback. While typically associated with high Eddington ratios, BAL quasars also occur in low ...
  • Study of giant radio galaxies using spectroscopic observations from the Himalayan Chandra Telescope 
    Sethi, S; Dabhade, Pratik; Biju, K. G; Stalin, C. S; Jamrozy, M (EDP Sciences, 2025-03)
    We present the results of spectroscopic observations of host galaxies of eleven candidate giant radio galaxies (GRGs), powered by active galactic nuclei (AGNs), conducted with the 2-m Himalayan Chandra Telescope (HCT). The ...
  • SN 2021foa: the bridge between SN IIn and Ibn 
    Gangopadhyay, A; Dukiya, Naveen; Moriya, Takashi J; Tanaka, M; Maeda, K; Howell, D. A; Singh, Mridweeka; Singh, Avinash; Sollerman, Jesper; Kawabata, K. S; Brennan, Sean J; Pellegrino, Craig; Dastidar, R; Nakaoka, Tatsuya; Kawabata, Miho; Misra, K; Schulze, Steve; Chandra, P; Taguchi, Kenta; Sahu, D. K; McCully, Curtis; Bostroem, K. Azalee; Gonzalez, Estefania Padilla; Newsome, Megan; Hiramatsu, Daichi; Takei, Yuki; Yamanaka, Masayuki; Tajitsu, A; Isogai, Keisuke (Oxford University Press on behalf of Royal Astronomical Society, 2025-03)
    We present the long-term photometric and spectroscopic analysis of a transitioning SN IIn/Ibn from −10.8 d to 150.7 d post V -band maximum. SN 2021foa shows prominent He I lines comparable in strength to the H α line around ...
  • Observations and modeling of two Type IIP supernovae in M61: similar yet so different 
    Teja, Rishabh Singh; Anupama, G. C; Sahu, D. K (Published by Cambridge University Press on behalf of International Astronomical Union, 2024)
    We present photometric and spectroscopic studies of two type IIP SNe (SN 2008in and SN 2020jfo), to infer their physical parameters. These SNe exploded in the same host galaxy, M 61 (NGC 4303), at different epochs. SN ...
  • Low-frequency radio view of a fast-blue optical transient - AT2018cow 
    Nayana, A. J; Chandra, Poonam (Cambridge University Press on behalf of International Astronomical Union, 2024)
    We present low-frequency (0.40 – 1.25 GHz) radio observations and modeling of a Fast Blue Optical Transient (FBOT), AT2018cow [Nayana & Chandra(2021)]. Our data are best modeled as an inhomogeneous synchrotron emitting ...
  • Differential rotation of the solar chromosphere using multidecadal Ca ii K spectroheliograms 
    Mishra, Dibya Kirti; Routh, Srinjana; Jha, Bibhuti K; Chatterjee, Subhamoy; Banerjee, D (Cambridge University Press on behalf of International Astronomical Union, 2024)
    The study of the differential rotation in the chromosphere of the Sun is of significant importance as it provides valuable insights into the rotational behaviour of the solar atmosphere at higher altitudes and the coupling ...
  • AGN outflows and its variability 
    Vivek, M; Nair, Akhil; Mishra, Sapna (Cambridge University Press on behalf of International Astronomical Union, 2024)
    The radiative mode of AGN feedback, operated through outflows, plays an essential role in the evolution of galaxies. Quasar outflows are detected as blue-shifted broad absorption lines in the UV/optical spectra of quasars. ...
  • A study in scarlet: I. Photometric properties of a sample of intermediate-luminosity red transients 
    Valerin, G; Pastorello, A; Reguitti, A; Benetti, S; Cai, Y. Z; Chen, T. W; Eappachen, D; Elias-Rosa, N; Fraser, M; Gangopadhyay, A; Hsiao, E. Y; Inserra, Cosimo; Izzo, Luca; Jencson, Jacob E; Kankare, E; Kotak, R; Mazzali, P. A; Misra, K; Pignata, G; Prentice, S. J; Sand, D. J; Smartt, S. J; Stritzinger, M. D; Tartaglia, L; Valenti, S; Anderson, Joseph P; Andrews, J. E; Amaro, R. C; Brennan, S; Bufano, F; Callis, E; Cappellaro, E; Dastidar, R; Della Valle, M; Fiore, Achille; Fulton, Michael D; Galbany, L; Heikkila, T; Hiramatsu, Daichi; Karamehmetoglu, E; Kuncarayakti, H; Leloudas, Giorgos; Lundquist, M; McCully, Curtis; Muller-Bravo, T. E; Nicholl, M; Ochner, P; Padilla Gonzalez, E; Paraskeva, Emmy; Pellegrino, Craig; Rau, A; Reichart, D. E; Reynolds, Thomas M; Roy, R; Salmaso, I; Singh, Mridweeka; Turatto, M; Tomasella, L; Wyatt, S; Young, D. R (EDP Sciences, 2025-03)
    Aims. We investigate the photometric characteristics of a sample of intermediate-luminosity red transients (ILRTs), a class of elusive objects with peak luminosity between that of classical novae and standard supernovae. ...
  • A study in scarlet: II. Spectroscopic properties of a sample of intermediate-luminosity red transients 
    Valerin, G; Pastorello, A; Mason, E; Reguitti, A; Benetti, S; Cai, Y. Z; Chen, T. W; Eappachen, D; Elias-Rosa, N; Fraser, M; Gangopadhyay, A; Hsiao, E. Y; Howell, D. A; Inserra, Cosimo; Izzo, Luca; Jencson, Jacob E; Kankare, E; Kotak, R; Lundqvist, P; Mazzali, P. A; Misra, K; Pignata, G; Prentice, S. J; Sand, D. J; Smartt, S. J; Stritzinger, M. D; Tartaglia, L; Valenti, S; Anderson, Joseph P; Andrews, J. E; Amaro, R. C; Barbarino, C; Brennan, S; Bufano, F; Callis, E; Cappellaro, E; Dastidar, R; Della Valle, M; Fiore, Achille; Fulton, Michael D; Galbany, L; Gromadzki, Mariusz; Heikkila, T; Hiramatsu, Daichi; Karamehmetoglu, E; Kuncarayakti, H; Leloudas, Giorgos; Limongi, M; Lundquist, M; McCully, Curtis; Muller-Bravo, T. E; Nicholl, M; Ochner, P; Padilla Gonzalez, E; Paraskeva, Emmy; Pellegrino, Craig; Rau, A; Reichart, D. E; Reynolds, Thomas M; Roy, R; Salmaso, I; Shahbandeh, M; Singh, Mridweeka; Sollerman, Jesper; Turatto, M; Tomasella, L; Wyatt, S; Young, D. R (EDP Sciences, 2025-03)
    Aims. We investigate the spectroscopic characteristics of intermediate-luminosity Red Transients (ILRTs), a class of elusive objects with peak luminosity between that of classical novae and standard supernovae. Our goal ...
  • Unveiling the kinematics of a central region in the triple-AGN host NGC 7733-7734 interacting group 
    Keshri, Saili; Barway, Sudhanshu; Mousumi Das; Yadav, Jyoti; Combes, Francoise (EDP Sciences, 2025-03)
    We present a detailed study of the interacting triple active galactic nuclear system, NGC 7733-34, focusing on stellar kinematics, ionised gas characteristics, and star formation within the central region and stellar bars ...
  • Baryonic ecosystem in galaxies (BEINGMgII): I. host galaxies of ultra-strong Mg II absorbers in the Subaru Hyper Suprime-Cam Survey 
    Joshi, Ravi; Das, S; Fumagalli, Michele; Fossati, Matteo; Peroux, Celine; Chaudhary, Reena; Yesuf, Hassen; Ho, Luis C (EDP Sciences, 2025-03)
    Context. We study the galaxies hosting ultra-strong Mg II (USMgII) absorbers at small impact parameters of ∼2″ (5‑20 kpc) spanning a redshift range of 0.4 ≤ z ≤ 1.7 using deep high-resolution images from the Hyper Suprime-Cam ...
  • Discovery and detailed study of the M31 Classical Nova AT 2023tkw: evidence for internal shocks 
    Basu, Judhajeet; Kumar, Ravi; Anupama, G. C; Barway, Sudhanshu; Hauschildt, Peter H.; Chamoli, Shatakshi; Swain, Vishwajeet; Bhalero, Varun; Karambelkar, Viraj; Kasliwal, Mansi; Das, Kaustav K; Andreoni, Igor; Singh, Avinash; Teja, Rishabh Singh (American Astronomical Society, 2025-02-10)
    We present a detailed analysis of an extragalactic slow classical nova in M31 exhibiting multiple peaks in its light curve. Spectroscopic and photometric observations were used to investigate the underlying physical ...
  • SN 2018is: a low-luminosity type IIP supernova with narrow hydrogen emission lines at early phases 
    Dastidar, R; Misra, K; Valenti, S; Sand, D. J; Pastorello, A; Reguitti, A; Pignata, G; Benetti, S; Bose, S; Gangopadhyay, A; Singh, Mridweeka; Tomasella, L; Andrews, J. E; Arcavi, I; Ashall, C; Bilinski, C; Bostroem, K. A; Buckley, D A. H; Cannizzaro, G; Chomiuk, L; Congiu, E; Dong, S; Dong, Y; Elias-Rosa, N; Fraser, M; Gall, C; Gromadzki, M; Hiramatsu, D; Hosseinzadeh, G; Howell, D. A; Hsiao, E. Y; McCully, C; Smith, N; Strader, J (EDP Sciences, 2025-02)
    We present a comprehensive photometric and spectroscopic study of the Type IIP supernova (SN) 2018is. The V band luminosity and the expansion velocity at 50 days post-explosion are −15.1 ± 0.2 mag (corrected for AV = 1.34 ...
  • Human resource development in astronomy: An Indian perspective 
    Bagla, Jasjeet Singh; Mousumi Das; Datta, Abhirup; Gogoi, Rupjyoti; Hota, A; Kembhavi, A. K; Malik, M. A; Misra, R; Pai, Archana; Pandey, Shashi Bhushan; Pandey, S. K; Rastogi, Shantanu; Ravikumar, C. D (Indian Academy of Sciences, 2025-06)
    In the 21st century, astronomy is one of the frontier research areas, and several astronomical observatories are planned worldwide with active international collaborations. India has been actively participating in many ...

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