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2024.04.16

The 4MOST instrument and upcoming spectroscopic surveys

<p>The 4MOST consortium has been selected by the European Southern Observatory (ESO) to provide the ESO community with a fibre-fed spectroscopic survey facility on the VISTA telescope with a large enough field-of-view to survey a large frac­tion of the southern sky in a few years. The facility will be able to simultaneously obtain spectra of ~2400 objects distributed over an hexagonal field-of-vie...</p>

2024.04.15

X-ray emissions from the large scale structure of the Universe with an eROSITA focus

<p>I will present the maps of the large scale structure at soft X-ray wavelength obtained by eROSITA. I will discuss how the observed emission unravels the properties of the circum-galactic medium of our Milky-Way and nearby galaxies.Then I discuss what astrophysical and cosmological information is contained in the map subtended by X-ray detected clusters and Active galactic nuclei</p>

2024.04.19

SgrA∗ spin and mass estimates through the detection of an extremely large mass-ratio inspiral

<p>Estimating the spin of SgrA∗ is one of the current challenges we face in understanding the center of our Galaxy. In the present work, we show that detecting the gravitational waves (GWs) emitted by a brown dwarf inspiraling around SgrA∗ will allow us to measure the mass and the spin of SgrA∗ with unprecedented accuracy. Such systems are known as extremely large mass-ratio inspirals (XMRIs) a...</p>

2024.04.12

Dynamical Modelling of Galactic Kinematics using Neural Networks

<p>The advent of integral field data has revolutionised the study of galaxy evolution. A key component of this is dynamical modelling methods which have allowed for crucial insights to be made from kinematic data. Despite this importance, most dynamical models make a number of key assumptions which do not hold for real galaxies. At the same time, machine learning methods are becoming increasingly ...</p>

2024.04.02

Baryon Recycle in Disc Galaxy

<p>We utilize the public Gizmo code to simulate twelve galaxies from the NIHAO suite simulated with the ESF-Gasoline2 code, then compare the corresponding galaxies in the two simulations. We find that while both codes with the same initial conditions and large-scale environments can successfully produce similar disc galaxies, significant differences are still seen in many properties of the galaxie...</p>

2024.03.29

Kinematic Signatures of Circumbinary Discs: Spiral arms, Fast Flows, and Doppler Flips

<p>Kinematic studies of protoplanetary discs are becoming a valuable method for uncovering hidden companions. While there exists a substantial amount of literature on the understanding of planet-disc interactions and their observational implications, little attention has been made towards circumbinary discs. Using 3D hydrodynamical simulations post-processed with Monte Carlo radiative transfer, I ...</p>

2024.03.26

Primordial non-Gaussianity (PNG) and Its Detection by Cosmolgical Surveys

<p>The simplest single-field inflation models predict a nearly Gaussian distribution of primordial density perturbations. However, the non-Gaussianity of the primordial density field serves as a powerful probe into the physics of the early universe, especially when considering more complex inflation models. The Cosmic Microwave Background (CMB) bispectrum has provided the tightest constraint on th...</p>

2024.03.29

Dust Dynamics in Planet Formation Processes & Towards Multi-stage Studies

<p>Dust plays an important&nbsp;role in planet formation as they grow from micron sized grains to over Mm sized planets. The intermediate stage, to form km-sized planetesimals from mm-cm sized dust particles, has been found to be difficult. These mm-cm sized dust particles frequently distribute in ring-like structures in protoplanetary disks as revealed in ALMA observations. Here, I present a series of...</p>

2024.03.20

AGN selection and demographics: a new age with JWST/MIRI

<p>Completing the census of active galactic nuclei (AGN) activity is the key to study the build-up of supermassive black holes (SMBHs) and understand their relations with the host galaxy properties. Nevertheless, many AGNs are obscured by dust and gas, making the identification of such systems a challenging task even today. In this talk, I will present the first results on the AGN identifications ...</p>

2024.03.19

Can we test cosmic homogeneity and isotropy?

<p>The Cosmological Principle (CP) was a major achievement of modern cosmology to turn qualitative statements into quantitative ones. It makes the strong assumption that space is globally homogeneous and isotropic. By doing so, it reduces Einstein’s Field Equations to provide highly symmetric cosmological models. The latter then enable us to interpret a very sparse amount of data and put them int...</p>