The exact sources of high-energy neutrinos detected by the IceCube neutrino observatory still remain a mystery. For the first time, this work explores the hypothesis that galaxy mergers may serve as sources for these ...
As one of the fundamental unknowns of our Universe, the mass of dark matter remains to be a topic of great interest. We consider the possibility of a time-variation of the dark matter mass. We study the cosmological ...
In the 1970s, Fulling, Davies, and Unruh demonstrated that the vacuum state perceived by an inertial observer in Minkowski space appears as a thermal bath to a uniformly accelerated observer. We explore the transformation ...
Srinivasaragavan, Gokul P; Perley, Daniel A; Ho, Anna Y. Q; O'Connor, Brendan; de Ugarte Postigo, A; Sarin, Nikhil; Cenko, S. Bradley; Sollerman, Jesper; Rhodes, Lauren; Green, D. A; Svinkin, Dmitry; Bhalerao, Varun; Waratkar, Gaurav; Nayana, A. J; Chandra, P; Miller, M. Coleman; Malesani, Daniele B; Ryan, Geoffrey; Srijan, Suryansh; Bellm, Eric C; Burns, Eric; Titterington, David J; Stone, Maria B; Purdum, Josiah; Ahumada, Tomas; Anupama, G. C; Barway, Sudhanshu; Coughlin, Michael W; Drake, Andrew J; Fender, Rob; Agui Fernandez, Jose F; Frederiks, Dmitry D; Geier, Stefan; Graham, Matthew J; Kasliwal, Mansi M; Kulkarni, S. R; Kumar, Harsh; Li, Maggie L; Laher, Russ R; Lysenko, Alexandra L; Parwani, Gopal; Perley, Richard A; Ridnaia, Anna V; Salgundi, Anirudh; Smith, Roger; Sravan, Niharika; Swain, Vishwajeet; Thone, C. C; Tsvetkova, Anastasia E; Ulanov, Mikhail V; Vail, Jada; Wise, Jacob L; Wold, Avery(Oxford University Press on behalf of Royal Astronomical Society, 2025-03)
We present multiwavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading ( Δmr=2.2 mag in Δt=0.74 d), luminous ( Mr∼−30.0 mag), and red ( g−r=0.50 mag) transient at z=2.28 with accompanying ...
Polarization of starlight and thermal dust emission due to aligned non-spherical grains helps us to trace magnetic field (B-field) morphology in molecular clouds and to study grain alignment mechanisms. In this work, we ...
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 (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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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. ...
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 ...