This study examines the preservation challenges and strategies implemented at the Library of the Kodaikanal Solar Observatory (KSO), part of the Indian Institute of Astrophysics. The library houses rare and sometimes fragile ...
Significant variability in broad emission line strengths of active galactic nuclei (AGN) over months to years has been observed, often accompanied by intrinsic continuum changes. Such spectral variability challenges the ...
Context. The standard nonlocal thermodynamic equilibrium (non-LTE) multi-level radiative transfer problem only takes into account the deviation of the radiation field and atomic populations from their equilibrium ...
Li, Maggie L; Ho, Anna Y. Q; Ryan, Geoffrey; Perley, Daniel A; Lamb, Gavin P; Nayana, A. J; Andreoni, Igor; Anupama, G. C; Bellm, Eric C; Berger, E; Bloom, Joshua S; Burns, Eric; Caiazzo, Ilaria; Chandra, P; Coughlin, Michael W; El-Badry, Kareem; Graham, Matthew J; Kasliwal, Mansi M; Keating, Garrett K; Kulkarni, S. R; Kumar, Harsh; Masci, Frank J; Perley, Richard A; Ramprasad Rao; Rodriguez, Antonio C; Rusholme, Ben; Sarin, Nikhil; Sollerman, Jesper; Srinivasaragavan, Gokul P; Swain, Vishwajeet; Vanderbosch, Zachary(American Astronomical Society, 2025-05-20)
In the past few years, the improved sensitivity and cadence of wide-field optical surveys have enabled the discovery of several afterglows without associated detected gamma-ray bursts (GRBs). We present the identification, ...
Phanindra, D. V. S; Greeshma, L. S; Vincent, Della; Raees, Muhammed; Nagaraju, K; Hegde, Gurumurthy; Sreekumar, P; Namboothiry, Manoj A. G(Springer Nature, 2025-12)
A high-precision polarimeter for simultaneous multi-line spectropolarimetric Sun observations is under development at Indian Institute of Astrophysics. Towards this end, we plan to use liquid-crystal retarders as the ...
Joseph, P; Tandon, S. N; Ghosh, S. K; Stalin, C. S(Springer Nature, 2025-12)
Ultra-Violet Imaging Telescope (UVIT) on board AstroSat is an active telescope capable of highresolution far-ultraviolet imaging (<1.5) and low-resolution (λ/δλ ≈ 100) slitless spectroscopy with a fieldof-view as large as ...
Bhalerao, Varun; Misra, K; Anupama, G. C; Iyyani, S; Joshi, Jagdish C; Nayana, A. J; Resmi, L; Sahu, D. K; Tendulkar, Shriharsh(Springer Nature, 2025-12)
Time Domain Astronomy (TDA) has ushered in a new era of cosmic exploration. This has been possible with the advanced sensitive surveys that have allowed the discovery and classification of transients to reach unprecedented ...
From a careful visual scrutiny of the radio structures of a well-defined sample of 2428 sources in the LoTSS-DR2 survey made at 144 MHz with a 6 beam, we have selected a subset of 25 (i.e., 1%) sources showing highly unusual ...
The study of exoplanets is one of the fastest-growing areas in astronomy. The number of known
exoplanets has increased dramatically, providing new insights into the galaxy’s diversity and abundance of
planetary systems. ...
The interaction between the solar wind and Martian crustal magnetic fields plays a significant role in shaping electron precipitation in the ionosphere, particularly on the nightside. Using five years of data from the Mars ...
Shantikumar, N. S; Mukhopadhyay, Swagata; Madhavan, B. L; Srivastava, A. K; Sharma, Som K; Singh, Amarendra; Jorphel, Sonam; Angchuk, D; Mahay, T. T(Elsevier B.V, 2025-07-15)
Aerosol optical and radiative properties over the Leh Ladakh, located in the climate sensitive Hindu Kush
Himalayan region are examined using one year measurements from a newly installed sky radiometer from July
2023 ...
Mondal, Santanu; Giri, Gourab; Joshi, Ravi; Wiita, P. J; Krishna, G; Ho, Luis C(American Astronomical Society, 2025-07-10)
Our understanding of large-scale radio jets in merger systems has been drastically improved in the era of the Very Large Array, Very Long Baseline Array/European VLBI Network, upgraded Giant Metrewave Radio Telescope, and ...
The transient Galactic black hole candidate Swift J151857.0-572147 went through an outburst in 2024 March for the first time. Using publicly archived Insight-HXMT data, we have analyzed the timing and spectral properties ...
We present a pilot method to estimate the high-mass initial mass function (IMF) across the arm, interarm, and spur regions in galaxies and apply it to NGC 628. We extracted star-forming complexes (SFCs) from the Hα Very ...
Context. Be stars are rapidly rotating stars surrounded by a disc; however, the origin of these stars remains unclear. Mass and angular momentum transfer in close binaries account for the rapid rotation of a major fraction ...
Aims. We present the results of applying anomaly detection algorithms to a quasar spectroscopic subsample from the SDSS DR16 quasar catalog, covering the redshift range of 1.88 ≤ z ≤ 2.47.
Methods. A principal component ...
Dessart, Luc; Hillier, D. J; Sarangi, Arkaprabha(EDP Sciences, 2025-05)
Dust is expected to form on a year timescale in core-collapse supernova (SN) ejecta. Its existence is revealed through an infrared brightening, an optical dimming, or a blue-red emission-line profile asymmetry. To investigate ...
Sharma, Paryag; Srianand, R; Chand, H; Guha, Labanya Kumar(Oxford University Press on behalf of Royal Astronomical Society, 2025-07)
Using a sample of 166 projected quasar pairs, we investigate the influence of active galactic nuclei on the circumgalactic medium of the quasar host galaxies probed using strong Mg II absorption (i.e. W2796 ≥ 1 Å) at impact ...
We explore the diagnostic potential of the Hα line for probing the chromospheric magnetic field using a realistic
3D radiative magnetohydrodynamic (rMHD) model. The Stokes profiles of the Hα line are synthesized through
full ...
We study the magnetic reconnection during a flare by investigating flare ribbon dynamics using observations and data-constrained magnetohydrodynamics (MHD) simulation. In particular, we estimate the reconnection flux and ...