30 citations · 321 across the 33 of their papers we have counts for
31 papers · 1 filter
BRAHMa: Bar Recognition And Hatching using Machine learning -- a framework for oriented bounding box detection of galactic bars
Rajit Shrivastava, Narendra Nath Patra, Keerthi K
Galactic bars are fundamental components in studies of dark matter, galaxy evolution, and secular dynamics. However, current methods for measuring bar properties suffer from signif…
The Multi-phase HI of the Milky Way and Nearby Galaxies
Marc-Antoine Miville-Deschênes, J. R. Dawson, Narendra Nath Patra +30
Atomic hydrogen (HI) is the dominant baryonic component of the interstellar medium (ISM) in Milky Way-like galaxies and the reservoir from which molecular clouds and stars ultimate…
Searching for a superdisk in radio galaxy J0116-473
Ankur Sinha, Riya Rathore, Narendra Nath Patra +1
Superdisks have emerged as an active area of research in recent years, and J0116-473 represents a promising target for studying this extended structure. Our primary objective was t…
HI Observations of Baryon-Dominated Dwarf Galaxy Candidates
Atharva Mirashi, Abhinav Narayan, K. Keerthi +7
We present resolved HI observations of six dwarf galaxies drawn from a sample of baryon-dominated dwarf galaxy (BDDG) candidates previously identified using global HI spectra from…
The GMRT archive atomic gas survey -- IV. Consistency of the dark matter halo perturbation parameter from morphological and kinematic lopsidedness of galaxies
Prerana Biswas, Narendra Nath Patra, Veselina Kalinova
The lopsidedness of galaxies is a commonly observed phenomenon, and through different studies, it has been observed that nearly 30% of galaxies show this phenomenon. In this work,…
The GMRT archive atomic gas survey -- III. Comparative Study of Dark Matter Halos in Nearby Galaxies
Sougata Sarkar, Prerana Biswas, Veselina Kalinova +3
The distribution of dark matter in the inner regions of galaxies poses a key challenge for small-scale ΛCDM cosmology. While cold dark matter simulations predict cuspy inner densit…
The vertical structure of the stellar disk in NGC 551
Harshal Raut, Narendra Nath Patra, Prerana Biswas +6
We self-consistently determine the 3D density distribution of NGC 551's stellar disk and study observational signatures of two-component stellar disks. Assuming baryonic disks are…
The Interaction Jigsaw: Investigating star formation in interacting galaxies
Thomas Robin, Sreeja S Kartha, Akhil Krishna R +5
Interaction between galaxies play a pivotal role in their evolution. Ongoing star formation in spiral galaxies can be affected by these processes. We select a sample of interacting…
The temperature of the neutral Interstellar Medium in the Galaxy
Narendra Nath Patra, Nirupam Roy
Atomic Hydrogen-21 cm transition (HI) is an excellent tracer to study and understand the properties of the atomic gas in the Galaxy. Using the Westerbork Synthesis Radio Telescope…
The GMRT archive atomic gas survey -- II. Mass modelling and dark matter halo properties across late-type spirals
Prerana Biswas, Veselina Kalinova, Nirupam Roy +2
Studying the kinematics and mass modelling of galaxies from HI 21 cm data provides valuable insights into the properties of both the baryonic components and the dark matter halo in…
Probing galaxy evolution through HI 21-cm emission and absorption: current status and prospects with the Square Kilometre Array
Rajeshwari Dutta, Sushma Kurapati, J. N. H. S. Aditya +8
One of the major science goals of the Square Kilometre Array (SKA) is to understand the role played by atomic hydrogen (HI) gas in the evolution of galaxies throughout cosmic time.…
The GMRT archive atomic gas survey -- I. Survey definition, methodology, and initial results from the pilot sample
Prerana Biswas, Narendra Nath Patra, Nirupam Roy +1
Interferometric observations of HI in galaxies played a pivotal role in studies of nearby galaxies. Compared to single-dish observation, it provides resolved distribution of gas in…
A Comparison of the UV and HI Properties of the Extended UV (XUV) Disk Galaxies NGC 2541, NGC 5832 and ESO406-042
M. Das, Yadav, J. +11
We present a UV study of 3 extended UV (XUV) galaxies that we have observed with the UVIT and the GMRT. XUV galaxies show filamentary or diffuse star formation well beyond their op…
Comparing the Inner and Outer Star Forming Complexes in the Nearby Spiral Galaxies NGC 628, NGC 5457 and NGC 6946 using UVIT Observations
Jyoti Yadav, Mousumi Das, Narendra Nath Patra +5
We present a far-UV (FUV) study of the star-forming complexes (SFCs) in three nearby galaxies using the Ultraviolet Imaging Telescope (UVIT). The galaxies are close to face-on and…
Thick disc molecular gas fraction in NGC 6946
Narendra Nath Patra
Several recent studies reinforce the existence of a thick molecular disc in galaxies along with the dynamically cold thin disc. Assuming a two-component molecular disc, we model th…
HI scale height in spiral galaxies
Narendra Nath Patra
We model the galactic discs of seven nearby large spiral galaxies as three-component systems consist of stars, molecular gas, and atomic gas in vertical hydrostatic equilibrium. We…
New HI observations of KK 69. Is KK 69 a dwarf galaxy in transition?
J. Saponara, B. S. Koribalski, N. N. Patra +1
We present new HI data of the dwarf galaxy KK 69, obtained with the Giant Metrewave Radio Telescope (GMRT) with a signal-to-noise ratio that almost double previous observations. We…
HI scale height in dwarf galaxies
Narendra Nath Patra
Assuming a vertical hydrostatic equilibrium in the baryonic discs, joint Poisson's-Boltzmann equation was set up and solved numerically in a sample of 23 nearby dwarf galaxies from…
Theoretical modelling of two-component molecular discs in spiral galaxies
Narendra Nath Patra
As recent observations of the molecular discs in spiral galaxies point to the existence of a diffuse, low-density thick molecular disc along with the prominent thin one, we investi…
Molecular scale height in spiral galaxies
Narendra Nath Patra
Having to have low thermal energy, the molecular gas in galaxies is expected to settle in a thin disc near the midplane. However, contradicting this understanding, recent studies h…
Gas-dust correlations in nearby galaxies: a case study of NGC 3184 and NGC 7793
Gautam Saikia, Narendra Nath Patra, Nirupam Roy +1
The study of gas-dust interactions occurring in the interstellar medium of a galaxy is essential for understanding various physical processes taking place within it. A comparison o…
Detection of a slow HI bar in the dwarf irregular galaxy DDO 168
Narendra Nath Patra, Chanda J Jog
We examine the HI total intensity maps of the VLA LITTLE-THINGS galaxies and identify an HI bar in the dwarf irregular galaxy DDO 168 which has a dense and compact dark matter halo…
Detection of the Galactic Warm Neutral Medium in HI 21cm absorption
Narendra Nath Patra, Nissim Kanekar, Jayaram N. Chengalur +6
We report a deep Giant Metrewave Radio Telescope (GMRT) search for Galactic H{\sc i} 21cm absorption towards the quasar B0438436, yielding the detection of wide, weak H{\sc i} 2…
A self-consistent hydrostatic mass modelling of pressure supported dwarf galaxy Leo T
Narendra Nath Patra
Assuming a hydrostatic equilibrium in an HI cloud, the joint Poisson's equation is set up and numerically solved to calculate the expected HI distribution. Unlike previous studies,…