Aritra Kundu

Probing Atomic Dark Matter with Stellar Streams in Milky Way-mass Galaxies

Lucas S. Mandacarú Guerra, Stephanie O'Neil, Mariangela Lisanti, Sandip Roy et autres

Abstract We present the first detailed analysis of the effects of dissipative dark matter (DM) on stellar streams. As a concrete example, we generate a cosmological hydrodynamic zoom-in simulation of a Milky Way (MW)-mass galaxy, assuming that the DM consists of cold …

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The dynamics of old inner galaxy stars in Milky Way-mass galaxies using FIRE-2 simulations

Emma Tasso, Madeline Lucey, Robyn E. Sanderson, Aritra Kundu et autres

ABSTRACT Understanding how galaxies like the Milky Way assembled over cosmic time remains a central question in astrophysics. Understanding the processes that shaped their formation and evolution is greatly enhanced by the joint use of observational data and high-resolution cosmological simulations. Old …

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The Dynamics of Old Inner Galaxy Stars in Milky Way-mass Galaxies Using FIRE-2 Simulations

Emma Tasso, Madeline Lucey, Robyn Sanderson, Aritra Kundu et autres

Understanding how galaxies like the Milky Way assembled over cosmic time remains a central question in astrophysics. Understanding the processes that shaped their formation and evolution is greatly enhanced by the joint use of observational data and high-resolution cosmological simulations. Old stars …

The Dynamics of Old Inner Galaxy Stars in Milky Way-mass Galaxies Using FIRE-2 Simulations

Emma Tasso, Madeline Lucey, Robyn Sanderson, Aritra Kundu et autres

Understanding how galaxies like the Milky Way assembled over cosmic time remains a central question in astrophysics. Understanding the processes that shaped their formation and evolution is greatly enhanced by the joint use of observational data and high-resolution cosmological simulations. Old stars …

us (code pays fourni par la source)

Probing Atomic Dark Matter with Stellar Streams in Milky Way-Mass Galaxies

Lucas S. Mandacarú Guerra, Stephanie O'Neil, Mariangela Lisanti, Sandip Roy et autres

We present the first detailed analysis of the effects of dissipative dark matter on stellar streams. As a concrete example, we generate a cosmological hydrodynamic zoom-in simulation of a Milky Way-mass galaxy, assuming that the dark matter consists of Cold Dark Matter …

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Rise of the Forsaken Relics: Connecting Present-day Stellar Streams and Phase-mixed Galaxies to the Epoch of Reionization

Aritra Kundu, Robyn E. Sanderson, Adam Lidz, Pratik J. Gandhi et autres

Abstract The “near–far” approach to studying reionization leverages the star formation histories of the Milky Way (MW) or Local Group (LG) galaxies, derived from resolved photometry, to infer the low-mass/faint end of the stellar mass functions (SMFs) or the ultraviolet luminosity functions …

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Rise of the Forsaken Relics: Connecting Present-day Stellar Streams and Phase-mixed Galaxies to the Epoch of Reionization

Aritra Kundu, Robyn E. Sanderson, Adam Lidz, Pratik J. Gandhi et autres

Abstract The “near–far” approach to studying reionization leverages the star formation histories of the Milky Way (MW) or Local Group (LG) galaxies, derived from resolved photometry, to infer the low-mass/faint end of the stellar mass functions (SMFs) or the ultraviolet luminosity functions …

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Cosmological Predictions for Minor Axis Stellar Density Profiles in the Inner Regions of Milky Way–mass Galaxies

Madeline Lucey, Robyn E. Sanderson, Danny Horta, Aritra Kundu et autres

Abstract ΛCDM cosmology predicts the hierarchical formation of galaxies, which build up mass by merger events and accreting smaller systems. The stellar halo of the Milky Way (MW) has proven to be useful a tool for tracing this accretion history. However, most …

Cosmological predictions for minor axis stellar density profiles in the inner regions of Milky Way-mass galaxies

Madeline Lucey, Robyn E. Sanderson, Danny Horta, Aritra Kundu et autres

$Λ$CDM cosmology predicts the hierarchical formation of galaxies which build up mass by merger events and accreting smaller systems. The stellar halo of the Milky Way has proven to be useful a tool for tracing this accretion history. However, most of this …

rms–flux relation and disc–jet connection in blazars in the context of the internal shocks model

Aritra Kundu, Ritaban Chatterjee, Kaustav Mitra, Sripan Mondal

ABSTRACT Recent analysis of blazar variability has revealed a proportionality between the mean flux and the root mean squared (rms) fluctuations about the mean flux. Although such rms–flux relation has been previously observed in the accretion disc/corona variability of X-ray binaries and …

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Cosmic recombination history in light of EDGES measurements of the cosmic dawn 21-cm signal

Kanan K. Datta, Aritra Kundu, Ankit Paul, Ankita Bera

The recent EDGES measurements of the global 21-cm signal from the cosmic dawn suggest that the kinetic temperature of the intergalactic medium (IGM) might be significantly lower compared to its expected value. The colder IGM directly affects the hydrogen recombination of the …

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Mass of highly magnetized white dwarfs exceeding the Chandrasekhar limit: An analytical view

Aritra Kundu, Banibrata Mukhopadhyay

In recent years a number of white dwarfs have been observed with very high surface magnetic fields. We can expect that the magnetic field in the core of these stars would be much higher (similar to 10(14) G). In this paper, we …

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