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Star formation in neutral hydrogen gas reservoirs at cosmic noon

Dharmender; Joshi, Ravi; Fumagalli, Michele; Noterdaeme, Pasquier; Chand, Hum; Ho, Luis C (EDP Sciences, 2024-12)

We aim to constrain the average star formation associated with neutral hydrogen gas reservoirs at cosmic noon. We used a unprecedented sample of 1716 high-column-density, damped Ly-α absorbers (DLAs) from the Sloan Digital ...
AT 2021hdr: A candidate tidal disruption of a gas cloud by a binary super massive black hole system

Hernandez-García, L; Munoz-Arancibia, A. M; Lira, P; Bruni, G; Cuadra, J; Arevalo, P; Sanchez-Saez, P; Bernal, S; Bauer, Franz E; Catelan, Marcio; Panessa, F; Pavez-Herrera, M; Ricci, Claudio; Reyes-Jainaga, I; Ailawadhi, Bhavya; Chavushyan, V; Dastidar, R; Deconto-Machado, A; Forster, F; Gangopadhyay, A; Garcia-Perez, A; Marquez, I; Masegosa, J; Misra, K; Patino-Alvarez, V. M; Puig-Subira, M; Rodi, J; Singh, M (EDP Sciences, 2024-12)

With a growing number of facilities able to monitor the entire sky and produce light curves with a cadence of days, in recent years there has been an increased rate of detection of sources whose variability deviates from ...
Transition region brightening in a moss region and their relation with lower atmospheric dynamics

Ram, Bhinva; Samanta, T; Chen, Yajie; Sterling, Alphonse C; Joshi, Jayant; Yurchyshyn, Vasyl; Chitta, L. P; Pant, Vaibhav (American Astronomical Society, 2024-12-10)

Small-scale brightenings (SBs) are commonly observed in the transition region (TR) that separates the solar chromosphere from the corona. These brightenings, omnipresent in active region patches known as "moss" regions, ...
Demography of stellar radio population within 500 pc: a VLASS-gaia DR3 study

Ayanabha, D; Narang, Mayank; Puravankara, Manoj; Shridharan, B; Tyagi, Himanshu; Banerjee, Bihan; Nayak, Prasanta K; Surya, Arun (American Astronomical Society, 2024-12)

In this work, we have carried out a systematic analysis of the Very Large Array Sky Survey (VLASS) quick look catalogs together with Gaia DR3 to identify the optical counterparts of 3 GHz radio emitters within 500 pc to ...
Insight-HXMT view of the black hole candidate swift J1727.8–1613 during its outburst in 2023

Chatterjee, Kaushik; Mondal, Santanu; Singh, Chandra B; Sugizaki, Mutsumi (American Astronomical Society, 2024-12-20)

The transient Galactic black hole candidate Swift J1727.8-1613 went through an outburst for the very first time in 2023 August and lasted for almost 6 months. We study the timing and spectral properties of this source using ...
Low-latitude auroras: insights from 2023 april 23 solar storm

Vichare, Geeta; Bhaskar, Ankush; Rawat, Rahul; Yadav, Virendra; Mishra, Wageesh; Angchuk, D; Singh, Anand Kumar (American Astronomical Society, 2024-12-20)

In 2023 April, a low-latitude aurora observed by the all-sky camera at Hanle, Ladakh, India (33°14'N geographic latitude), generated significant interest. This was the first such aurora recorded from the Indian region in ...
Development of Customized Project Management Methodology for the Implementation of Online Archives Exhibitions: Insights and Evaluation from a Research and Development Organization

Arumugam, P.; Thomas, Temin; Rega, R. (De Gruyter, 2024-12)

This study explores the development of a customized project management methodology tailored for the implementation of online archives exhibitions, offering insights and evaluation derived from a research and development ...
UVIT study of the MAgellanic clouds (U-SMAC). II. a far-uv catalog of the small magellanic cloud: morphology and kinematics of young stellar population

Hota, Sipra; Subramaniam, A; Nayak, Prasanta K; Subramanian, S (American Astronomical Society, 2024-12-02)

The Small Magellanic Cloud (SMC) is an irregular dwarf galaxy that has recently undergone an interaction with the Large Magellanic Cloud. The young massive stars in the SMC formed in the disturbed low-metallicity environment ...
Probing the morphology of polarized emission induced by fluctuation dynamo using minkowski functionals

Dutta, Riju; Sur, Sharanya; Basu, Aritra (American Astronomical Society, 2024-12-01)

The morphology and the characteristic scale of polarized structures provide crucial insights into the mechanisms that drive turbulence and maintain magnetic fields in magneto-ionic plasma. We aim to establish the efficacy ...
Applying the velocity gradient technique in NGC 1333: comparison with dust polarization observations

Archana Soam; Yuen, Ka Ho; Stephens, Ian; Law, Chi-Yan; Ho, Ka Wai; Coude, Simon (American Astronomical Society, 2024-12-01)

Magnetic fields (B-fields) are ubiquitous in the interstellar medium (ISM), and they play an essential role in the formation of molecular clouds and subsequent star formation. However, B-fields in interstellar environments ...
uGMRT survey of EXoplanets around m-dwarfs (GS-EXAM): radio observations of GJ 1151

Narang, Mayank; Puravankara, Manoj; Vedantham, H. K; Ishwara-Chandra, C. H; De, Ayanabha; Tyagi, Himanshu; Banerjee, Bihan; Nayak, Prasanta K; Surya, Arun; Shridharan, B; Pathak, Vinod C; Tripathi, Mihir (American Astronomical Society, 2024-12)

Coherent radio emission with properties similar to planetary auroral signals has been reported from GJ 1151, a quiescent, slow-rotating mid-M star, by the LOFAR Two-meter (120–170 MHz) Sky Survey. The observed LOFAR emission ...
Probing massive gravitons in f(R) with lensed gravitational waves

Sharma, Vipin Kumar; Harikumar, Sreekanth; Grespan, Margherita; Biesiada, Marek; Verma, Murli Manohar (Elsevier B.V Funded by SCOAP, 2024-12)

We investigate the novel features of gravitational wave solutions in f(R) gravity under proper gauge considerations in the shifted Ricci scalar background curvature (R1+ϵ). The solution is further explored to study the ...
Deciphering the evolution of thermodynamic properties and their connection to the global kinematics of high-speed coronal mass ejections using FRIS model

Khuntia, Soumyaranjan; Mishra, Wageesh; Wang, Yuming; Mishra, S. K; Nieves-Chinchilla, Teresa; Lyu, Shaoyu (Oxford University Press on behalf of Royal Astronomical Society, 2024-12)

Most earlier studies have been limited to estimating the kinematic evolution of coronal mass ejections (CMEs), and only limited efforts have been made to investigate their thermodynamic evolution. We focus on the interplay ...
ATOMS: ALMA three-millimeter observations of massive star-forming regions – XVIII. On the origin and evolution of dense gas fragments in molecular shells of compact H II regions

Zhang, Siju; Liu, Tie; Wang, Ke; Zavagno, A; Garay, Guido; Liu, Hong-li; Xu, Feng-wei; Liu, Xunchuan; Sanhueza, Patricio; Archana Soam; Zhou, Jian-wen; Li, Shanghuo; Goldsmith, Paul F; Zhang, Yong; Chibueze, J. O; Lee, Chang Won; Hwang, Jihye; Bronfman, Leonardo; Dewangan, L. K (Oxford University Press on behalf of Royal Astronomical Society, 2024-12)

Fragmentation and evolution for the molecular shells of the compact H II regions are less explored compared to their evolved counterparts. We map nine compact H II regions with a typical diameter of 0.4 pc that are surrounded ...
High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616)

Ikonnikova, N. P; Parthasarathy, M; Shaposhnikov, Ivan A; Hubrig, S; Sarkar, Geetanjali (Springer Nature, 2024-12)

An analysis of the high-resolution (R∼48000) optical spectrum of hot (B1Ibe) post-AGB star LS 4331 (IRAS 17381‑1616) is presented. The detailed identification of the observed absorption and emission features in the wavelength ...
Stellar substructures in the galactic disc and halo: properties, origins, and evolution

Deepak (Springer Nature, 2024-12)

Spatial, kinematic, and orbital properties, along with ages and chemical compositions of the thin disc, thick disc, and various stellar substructures in the halo, are studied based on data from the LAMOST and Gaia surveys. ...
Design requirements of a spectropolarimeter for solar extreme-ultraviolet observations and characterization of a K-mirror based on Brewster's angle

Khan, Raveena; Radhika, Dharmadhikari; Mathur, Harsh; Nagaraju, K; Jain, Sinchana R; Phanindra, D. V. S; Sagayanathan, K (Optica Publishing Group, 2024-12-01)

Measuring the linear polarization signal in extreme-ultraviolet (EUV) spectral lines, produced by the Hanle effect, offers a promising technique for studying magnetic fields in the solar corona. The required signal-to-noise ...
A tale of NGC 3785: The formation of an ultra-diffuse galaxy at the end of the longest tidal tail

Watts, Chandan; Barway, Sudhanshu; Bait, Omkar; Wadadekar, Y (EDP Sciences, 2024-11)

Aims. We present the discovery of an extended and faint tail observed in the isolated environment associated with galaxy NGC 3785. This study additionally provides observational evidence supporting the formation of ...
Detection of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650

Bharathan, Athira M; Stalin, C. S; Chatterjee, Rwitika; Sahayanathan, S; Pal, Indrani; Mathew, Blesson; Agrawal, V. K (Indian Academy of Sciences, 2024-11)

We report the measurement of X-ray polarization in the high synchrotron peaked blazar 1ES 1959+650. Of the four epochs of observations from the Imaging X-ray Polarimetry Explorer, we detected polarization in the 2–8 keV ...
The stellar bar–dark matter halo connection in the TNG50 simulations

Ansar, Sioree; Mousumi Das (American Astronomical Society, 2024-11-10)

Stellar bars in disk galaxies grow as stars in near-circular orbits lose angular momentum to their environments, including their dark matter (DM) halo, and transform into elongated bar orbits. This angular momentum exchange ...

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