37 citations · 289 across the 20 of their papers we have counts for
20 papers
The disc origin of the Milky Way bulge: On the high velocity dispersion of metal-rich stars at low latitude
Tristan Boin, Paola Di Matteo, Sergey Khoperskov +5
Previous studies of the chemo-kinematic properties of stars in the Galactic bulge have revealed a puzzling trend. Along the bulge minor axis, and close to the Galactic plane, metal…
Bars and boxy/peanut bulges in thin and thick discs III. Boxy/peanut bulge formation and evolution in presence of thick discs
Soumavo Ghosh, Francesca Fragkoudi, Paola Di Matteo +1
Boxy/peanut (b/p) bulges, the vertically extended inner parts of bars, are ubiquitous in barred galaxies in the local Universe, including our own Milky Way. At the same time, a maj…
Looking for a needle in a haystack: Measuring the length of a stellar bar
Soumavo Ghosh, Paola Di Matteo
One of the challenges related to stellar bars is to accurately determine the length of the bar in a disc galaxy. In the literature, a wide variety of methods have been employed to…
Quantifying the influence of bars on action-based dynamical modelling of disc galaxies
Soumavo Ghosh, Wilma H. Trick, Gregory M. Green
Action-based dynamical modelling, using stars as dynamical tracers, is an excellent diagnostic to estimate the underlying axisymmetric matter distribution of the Milky Way. However…
Bars and boxy/peanut bulges in thin and thick discs. II. Can bars form in hot thick discs?
Soumavo Ghosh, Francesca Fragkoudi, Paola Di Matteo +1
The Milky Way as well as a majority of external galaxies possess a thick disc. However, the dynamical role of the (geometrically) thick disc on the bar formation and evolution is n…
The pattern speeds of vertical breathing waves
Tigran Khachaturyants, Victor P. Debattista, Soumavo Ghosh +2
We measure and compare the pattern speeds of vertical breathing, vertical bending, and spiral density waves in two isolated N-body+SPH simulations, using windowed Fourier transform…
Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions
Ankit Kumar, Soumavo Ghosh, Sandeep Kumar Kataria +2
It is now clear that the stars in the Solar neighbourhood display large-scale coherent vertical breathing motions. At the same time, Milky Way-like galaxies experience tidal intera…
Dynamical interplay of disc thickness and the interstellar gas: implication for the longevity of spiral density waves
Soumavo Ghosh, Chanda J. Jog
A typical galactic disc has a finite thickness and in addition to stars it also contains a finite amount of interstellar gas. Here, we investigate the physical impact of the finite…
Multiple pattern speeds in a long peanut-shaped bar in a simulated galaxy
Pavan Vynatheya, Kanak Saha, Soumavo Ghosh
A significant fraction of barred spiral galaxies exhibits peanut/X-shaped structures in their central regions. Bars are known to rotate with a single pattern speed, and they eventu…
Genesis of morpho-kinematic lopsidedness in minor merger of galaxies
Soumavo Ghosh, Kanak Saha, Chanda J. Jog +2
An lopsided asymmetry is common in disc galaxies. Here, we investigate the excitation of an lopsidedness in host galaxies during minor mergers while choosing a set of 1…
Age dissection of the vertical breathing motions in Gaia DR2: evidence for spiral driving
Soumavo Ghosh, Victor P. Debattista, Tigran Khachaturyants
Gaia DR2 has revealed breathing motions in the Milky Way, with stars on both sides of the Galactic mid-plane moving coherently towards or away from it. The generating mechanism of…
Fate of stellar bars in minor merger of galaxies
Soumavo Ghosh, Kanak Saha, Paola Di Matteo +1
Minor merger of galaxies are common during the evolutionary phase of galaxies. Here, we investigate the dynamical impact of a minor merger (mass ratio 1:10) event on the final fate…
Dynamical Imprint of Dark Matter Halo and Interstellar Gas on Spiral Structure in Disk Galaxies
Soumavo Ghosh
This thesis investigates the dynamical effect of two structural components of disk galaxies, namely, the dark matter halo and the interstellar gas on the origin and persistence iss…
Effect of finite disk-thickness on swing amplification of non-axisymmetric perturbations in a sheared galactic disk
Soumavo Ghosh, Chanda J. Jog
A typical galactic disk is observed to have a finite thickness. Here, we present the study of the physical effect of introduction of finite thickness on the generation of small-sca…
Dwarf irregular galaxies with extended HI gas disks: Suppression of small-scale spiral structure by dark matter halo
Soumavo Ghosh, Chanda J. Jog
Dwarf irregular galaxies with extended HI disk distributions, such as DDO 154, allow measurement of rotation curves, hence deduction of dark matter halo properties to large radial…
Effect of dark matter halo on global spiral modes in a collisionless galactic disc
Soumavo Ghosh, Tarun Deep Saini, Chanda J. Jog
Low surface brightness (LSB) galaxies are dominated by dark matter halo from the innermost radii; hence they are ideal candidates to investigate the influence of dark matter on dif…
Dynamical effect of gas on spiral pattern speed in galaxies
Soumavo Ghosh, Chanda J Jog
In the density wave theory of spiral structure, the grand-design two-armed spiral pattern is taken to rotate rigidly in a galactic disc with a constant, definite pattern speed. The…
Effect of dark matter halo on global spiral modes in galaxies
Soumavo Ghosh, Tarun Deep Saini, Chanda J. Jog
Low surface brightness (LSB) galaxies form a major class of galaxies, and are characterized by low disc surface density and low star formation rate. These are known to be dominated…
Role of gas in supporting grand spiral structure
Soumavo Ghosh, Chanda J. Jog
The density wave theory for the grand-design two-armed spiral pattern in galaxies is successful in explaining several observed features. However, the long-term persistence of this…
Suppression of gravitational instabilities by dominant dark matter halo in low surface brightness galaxies
Soumavo Ghosh, Chanda J. Jog
The low surface brightness galaxies are gas-rich and yet have a low star formation rate, this is a well-known puzzle. The spiral features in these galaxies are weak and difficult t…