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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 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 ...
We present panchromatic optical + near-infrared (NIR) + mid-infrared (MIR) observations of the intermediate luminosity Type Iax supernova (SN Iax) 2024pxl and the extremely low-luminosity SN Iax 2024vjm. JWST
observations ...
Srinivasa, Apoorva; Sreedevi, Anu; Raju, K. P; Nagaraju, K; Singh, J; Karuppath, N; Devendran, P; Ramesh Kumar, T; Kumaravel, P(Oxford University Press on behalf of Royal Astronomical Society, 2025-08)
The Ca-K line profiles as functions of solar latitude and time were obtained through our observations from the Kodaikanal Solar Observatory using the solar tunnel telescope and spectrograph with a CCD detector. Observations ...
Ferro, A. A; Michel, R; Yepez, M. A; Muneer, S; Bustos Fierro, I. H; Prudil, Z(Oxford University Press on behalf of Royal Astronomical Society, 2025-08)
We present new time-series CCD VR photometry of the globular cluster NGC 5634. We aim to use the known RR Lyrae stars, members of the cluster, as indicators of mean metallicity and distance. Accurate coordinates, periods, ...
Recent observations reveal small-scale reconnection-driven plasma ejections, often termed nanojets, triggered by magnetic field interactions at slight misalignment angles. These fast, collimated plasma ejections are ∼1.5 ...
The classification of exoplanets has been a longstanding challenge in astronomy, requiring significant computational and observational resources. Traditional methods demand substantial effort, time, and cost, highlighting ...
Routh, Srinjana; Kumari, Anshu; Pant, V; Kandekar, Jaydeep; Banerjee, D; Khan, M. Saleem; Mishra, Dibya Kirti(EDP Sciences, 2025-08)
Context. Although the differential rotation rate on the solar surface has long been studied using optical and extreme ultraviolet (EUV) observations, associating these measurements with specific atmospheric heights remains ...
George, K; Poggianti, B. M; Vulcani, B; Gullieuszik, M; Postma, J; Fritz, J; Cote, P; Jaffe, Y. L; Moretti, A; Ignesti, Alessandro; Peluso, G; Tomicic, N; Subramaniam, A; Ghosh, S. K; Tandon, S. N(EDP Sciences, 2025-08)
Galaxies undergoing ram-pressure stripping develop gaseous tails that can extend several kiloparsecs outside the galaxy disc. Under favourable conditions, star formation can occur in the stripped tail, but there are cases ...
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 ...