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Now showing items 1-20 of 5858

Complex energy-dependent behaviour of quasiperiodic oscillations observed in GRS 1915+105

Sharma, Vaibhav; Misra, R; Jithesh, V; Chaudhary, Shivani; Jirawala, Khushi; Yadav, J. S; Jain, Pankaj; Juris, N. J (American Astronomical Society, 2026-09-10)

We present complex energy-resolved properties of quasiperiodic oscillations (QPOs) in the black hole X-ray binary GRS 1915+105 using an observation from the LAXPC instrument onboard AstroSat. Power density spectra (PDSs) ...
Cosmic chance superpositions: Largest catalog of quasar-galaxy pairs at a projected separation of D ≲ 20 kpc

Guha, Labanya Kumar; Srianand, R; Dutta, Rajeshwari (American Astronomical Society, 2026-09-10)

We present the largest catalogue to date of Galaxies On Top Of Quasars (GOTOQs)---systems where the sight line to a background quasar passes directly through or very close to a foreground galaxy. Using ~1.1 million quasar ...
Local patch analysis of ACT DR6 convergence map using morphological statistics

Bashir, Masroor; Nidharssan, S; Pravabati, C; Fazlu, Rahman; Goyal, Priya; Appleby, S; Park, C (American Physical Society, 2026-09-15)

We perform a comprehensive hierarchical, multiscale morphological analysis to search for anomalous behavior in the large-scale matter distribution, using the convergence map from the Atacama Cosmology Telescope Data Release ...
Radiation-driven evolution and gas kinematics of the bright-rimmed cloud SFO 25

Porel, Puja; Archana Soam; Vacca, William D; Karoly, Janik (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

Bright-rimmed clouds (BRCs) are valuable laboratories for investigating how ionizing radiation from massive stars reshapes molecular clouds and influences star formation. We present a kinematic and dynamical study of the ...
UOCS XX: Ultraviolet signatures of binary evolution in the open cluster Berkeley 21

Panthi, Anju; Deshmukh, Sanmesh; Chand, Komal; Vaidya, Kaushar (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

We present a multiwavelength study of the intermediate-age (∼2.1 Gyr) open cluster Berkeley 21 using ultraviolet observations from AstroSat/UVIT together with archival optical and infrared data. A machine learning-based ...
Spatial correlations of PAH, UV, Hα emission and IMF─PAH variations in the star-forming complexes of NGC 628

Amrutha, S; Rigopoulou, Dimitra; Mousumi Das; Yadav, Jyoti (Oxford University Press on behalf of Royal Astronomical Society, 2026-09)

We examine the spatial correlation of emission from polycyclic aromatic hydrocarbons (PAH) (3.3, 7.7, and 11.3 µm) with the far-ultraviolet(FUV), near-ultraviolet(NUV), and Hα emission from star-forming complexes(SFCs)in ...
Installation and commissioning of an in-house developed table-top Fabry-Perot interferometer and the quality of data recorded from it - a system that is made in India

Mahavarkar, Prasanna; Sriram, S; Remya, B. S; Joshi, Bhagyashree; Gurubaran, S (Springer Nature, 2026-09)

We present the design, indigenous development, and commissioning of a compact table-top Fabry-Perot interferometer (FPI) for high-resolution airglow observations. The system was initially tested at the Centre for Research ...
Caught in the act: Interaction-driven evolution in the nearby compact galaxy group Robert's Quartet (SCG0018-4854)

Keshri, Saili; Barway, Sudhanshu; Mousumi Das; Paswan, Abhishek (EDP Sciences, 2026-08)

We present a spatially resolved multiwavelength study of the compact galaxy group Robert's Quartet (RQ; SCG0018-4854), aimed at understanding interaction-driven galaxy evolution in dense environments. The system comprises ...
Unveiling the nature of barium stars: I. Asteroseismic masses and the evolutionary link between Ba dwarfs and giants

Sarmah, Lupamudra; Bharat Kumar, Y; Campbell, S. W; Maben, Sunayana; Reddy, B. E (EDP Sciences, 2026-08)

Context. Barium star systems are excellent sites for studying asymptotic giant branch (AGB) nucleosynthesis, binary evolution, and mass transfer processes. However, an accurate estimation of their fundamental stellar ...
Feeding and feedback in dwarf galaxies (FeeD) I. Evidence of nuclear ultra-fast and galaxy-scale outflows in the dwarf galaxy Arp 151

Mondal, Santanu; Patel, Ankit; Mezcua, M; Joshi, Ravi; Xu, Y; Aditya, K; Subramanian, S; Rodriguez Morales, V (EDP Sciences, 2026-08)

Feeding and feedback regulated by supermassive black holes play a central role in galaxy growth and evolution, yet these processes remain poorly understood in low-mass galaxies. In particular, the presence, properties, and ...
Formation and eruption of filament channel in solar active region 12975: insights from observations and simulations of magnetic field evolution

Mishra, Dinesh; Vemareddy, P; Kumar, Brajesh (American Astronomical Society, 2026-08-20)

We studied the magnetic field evolution of active region (AR) 12975 using a time-dependent magnetofrictional model. This AR produced two consecutive coronal mass ejections associated with M-class flares on 2022 March 28. ...
Properties of faint X-ray activity of XTE J1908+094 in 2019

Chatterjee, Debjit; Jana, Arghajit; Chatterjee, Kaushik; Bhowmick, Riya; Nath, Sujoy Kumar; Chakrabarti, S. K; Mangalam, A; Debnath, Dipak (Multidisciplinary Digital Publishing Institute, 2021-06)

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this ...
Photometric metallicity of galactic RR lyrae stars in the gaia DR3 era

Prakash, Mahiguhappriya; Das, Susmita; Singh, H. P; Kumar, Nitesh (Multidisciplinary Digital Publishing Institute, 2026-06)

RR Lyrae stars are pulsating variables crucial for distance determination and galactic structure studies. Metallicities of fundamental-mode (RRab) RR Lyrae stars are commonly derived from photometry using empirical relations ...
Constraining neutron-capture nucleosynthesis from surface chemical composition of chemically peculiar stars: The puzzling case of HE 1005-1439

Goswami, A; Choplin, Arthur; Goswami, P. P; Siess, L; Goriely, S (Multidisciplinary Digital Publishing Institute, 2026-06)

The chemical composition of stellar atmospheres provides a valuable window into the complex processes of stellar nucleosynthesis. Among chemically peculiar cool stars, many objects are the products of mass transfer in ...
Bar-driven gas redistribution suppresses star formation in spiral galaxies: Evidence from dust lanes in NGC 3351

George, K; Subramanian, S (EDP Sciences, 2026-06)

We present observational evidence, based on high-resolution imaging from HST, ALMA, and AstroSat/UVIT, that the redistribution of gas driven by the bar in the face-on spiral galaxy NGC 3351 results in suppressed star ...
Exploring the stellar streams and satellites around the giant low surface brightness galaxy Malin 1

Bustos Espinoza, Roy O. E; Blana, Matias; Galaz, Gaspar; Mora, Marcelo D; Junais; Mousumi Das; Barway, Sudhanshu; Ankit Kumar; Johnston, Evelyn J; Puzia, Thomas (EDP Sciences, 2026-08)

Context. Giant Low Surface Brightness galaxies (gLSBGs), such as Malin 1, host extended stellar and gaseous discs exceeding 100 kpc in radius. Their formation and evolution remain debated, with interactions with satellite ...
SN 2024dy: Dust formation in a long-lived type IIn supernova and constraints on the dust mass

Goto, Sota; Yamanaka, Masayuki; Kawabata, K. S; Tanaka, M; Singh, A; Sahu, D. K; Nakaoka, Tatsuya; Gangopadhyay, A; Nagayama, Takahiro; Dukiya, Naveen; Dubey, Monalisa; Misra, K; Ailawadhi, Bhavya (American Astronomical Society, 2026-08-01)

Type IIn supernovae (SNe) are a subclass of core-collapse SNe powered by interaction between the ejecta and the dense circumstellar material. Among them, long-lived Type IIn events are characterized by luminous, long-duration ...
A quiet host in an active planet-forming disk: Optical spectroscopy of WISPIT 2

Swastik, C; Bestha, M; Sonith, L. S; Facchini, Stefano; Sivarani, T; Banyal, R. K; Wahhaj, Zahed; Choudhary, Anupma; Maheswar, G; Saraf, Pallavi; Mallick, Anohita; Navaneeth, M. P; Biswas, S; Khushbu, K (EDP Sciences, 2026-08)

Context. WISPIT 2 is a young pre-main-sequence star hosting a multi-ringed transition disk and two directly imaged protoplanets. One of them, WISPIT 2b, has been confirmed to be accreting. This makes WISPIT 2 the closest ...
Origin of the double-peaked narrow emission lines in the optical spectra of X-shaped radio galaxies

Ghosh, Prajnadipt; Joshi, Ravi; Yang, Xiaolong; Zhang, Yingkang; Gopal-Krishna; Wiita, P. J; Patra, Dusmanta; Patel, Ankit; Goyal, A; Giri, Gourab; Mondal, Santanu; Negi, Vibhore; Wezgowiec, Marek; Malek, Katarzyna; Wu, Xue-Bing; Ho, Luis C (American Astronomical Society, 2026-08-01)

We investigate X-shaped radio galaxies (XRGs) with optical double-peaked narrow emission lines (DPNELs) as potential hosts of dual or binary supermassive black holes (SMBHs). Using available optical spectra from the Sloan ...
Galaxy groups within voids

Argudo-Fernandez, Maria; Torres-Rios, Gloria; Vasquez-Bustos, Paulo; Verley, Simon; Perez, Isabel; Duarte Puertas, S; Jimenez, Andoni; Garcia-Benito, Ruben; Zurita, A; Alcazar-Laynez, Manuel; Bidaran, Bahar; Conrado, Ana M; Espada, Daniel; Florido, Estrella; Gonzalez Delgado, R. M; Hernandez-Sanchez, Monica; del Moral-Castro, Ignacio; Roman, Javier; Sanchez-Menguiano, Laura; Subramanian, S; Villalba-Gonzalez, Pedro (EDP Sciences, 2026-08)

Context. Despite cosmic voids being vast and almost empty, galaxy aggregations do exist within them, although they are much sparser than in denser regions like walls, filaments, and clusters. The internal matter distribution ...

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