Ivan Minchev
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View article: Disc growth and vertical heating of lenticular galaxies in the Fornax cluster
Disc growth and vertical heating of lenticular galaxies in the Fornax cluster Open
We present a detailed analysis of the vertical and radial structure of mono-age stellar populations in three edge-on lenticular galaxies (FCC 153, FCC 170, and FCC 177) in the Fornax cluster, using deep MUSE observations. By measuring the …
View article: First large scale spatial and velocity patterns of local metal-rich stars in the Milky Way
First large scale spatial and velocity patterns of local metal-rich stars in the Milky Way Open
(Abridged) The present-day spatial and kinematic distribution of stars in the Milky Way provides key constraints on its internal dynamics and evolutionary history. We select stars that are more metal-rich than the interstellar medium (ISM)…
View article: A Galactic Self-portrait: Density Structure and Integrated Properties of the Milky Way Disk
A Galactic Self-portrait: Density Structure and Integrated Properties of the Milky Way Disk Open
The evolutionary history of the Milky Way disk is imprinted in the ages, positions, and chemical compositions of individual stars. In this study, we derive the intrinsic density distribution of different stellar populations using the final…
View article: The Importance of Urban Planning and Landscape Design in the Process of Creating ‘Great Places’ for Citizens
The Importance of Urban Planning and Landscape Design in the Process of Creating ‘Great Places’ for Citizens Open
Creating places where urban life is better and of a higher quality is one of the main tasks of the modern society. These places are called ‘great places’ and urban parks have all the predispositions to be one of them. Due to the functions …
View article: A geometry of cubic discriminants in 8 dimensions
A geometry of cubic discriminants in 8 dimensions Open
This paper examines 8-dimensional Riemannian manifolds whose structure group reduces to ${SO(4)}_{ir}\subset GL(8,\mathbb R)$, the image of an irreducible representation of $SO(4)$ on $\mathbb R^8$. We demonstrate that such a reduction can…
View article: Rediscovering the Milky Way with an orbit superposition approach and APOGEE data
Rediscovering the Milky Way with an orbit superposition approach and APOGEE data Open
The innermost parts of the Milky Way (MW) are very difficult to observe due to the high extinction along the line of sight, especially close to the disc mid-plane. However, this region contains the most massive complex stellar component of…
View article: Rediscovering the Milky Way with an orbit superposition approach and APOGEE data
Rediscovering the Milky Way with an orbit superposition approach and APOGEE data Open
The stellar disc is the dominant luminous component of the Milky Way (MW). Although our understanding of its structure is rapidly expanding due to advances in large-scale surveys of stellar populations across the Galaxy, our picture of the…
View article: Rediscovering the Milky Way with an orbit superposition approach and APOGEE data
Rediscovering the Milky Way with an orbit superposition approach and APOGEE data Open
We introduce a novel orbit superposition method designed to reconstruct the stellar density structure, kinematics, and chemical abundance distribution of the entire Milky Way by leveraging 6D phase-space information from its resolved stell…
View article: Bar-spiral interaction produces radial migration and star formation bursts
Bar-spiral interaction produces radial migration and star formation bursts Open
Central bars and spirals are known to strongly impact the evolution of their host galaxies, both in terms of dynamics and star formation. Their typically different pattern speeds cause them to regularly overlap, which induces fluctuations …
View article: Effects of secular growth and mergers on the evolution of metallicity gradients and azimuthal variations in a Milky Way-like galaxy
Effects of secular growth and mergers on the evolution of metallicity gradients and azimuthal variations in a Milky Way-like galaxy Open
We analyzed the evolution of the radial profiles and the azimuthal variations of the stellar metallicities from the V INTERGATAN simulation of a Milky Way-like galaxy. We find that negative gradients exist as soon as the disk settles at hi…
View article: Rediscovering the Milky Way with orbit superposition approach and APOGEE data III. Panoramic view of the bulge
Rediscovering the Milky Way with orbit superposition approach and APOGEE data III. Panoramic view of the bulge Open
The innermost parts of the Milky Way (MW) are very difficult to observe due to the high extinction along the line of sight, especially close to the disc mid-plane. However, this region contains the most massive complex stellar component of…
View article: Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc Open
The stellar disc is the dominant luminous component of the Milky Way (MW). Although our understanding of its structure is rapidly expanding due to advances in large-scale stellar surveys, our picture of the MW disc remains substantially ob…
View article: Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation
Rediscovering the Milky Way with orbit superposition approach and APOGEE data I. Method validation Open
We introduce a novel orbit superposition method designed to reconstruct the stellar density structure, kinematics, and chemical abundance distribution of the entire Milky Way by leveraging 6D phase-space information from its resolved stell…
View article: Evolution of the radial ISM metallicity gradient in the Milky Way disk since redshift $\approx 3$
Evolution of the radial ISM metallicity gradient in the Milky Way disk since redshift $\approx 3$ Open
Recent works identified a way to recover the time evolution of a galaxy's disk metallicity gradient from the shape of its age--metallicity relation. However, the success of the method is dependent on how the width of the star-forming regio…
View article: There is no place like home – finding birth radii of stars in the Milky Way
There is no place like home – finding birth radii of stars in the Milky Way Open
Stars move away from their birthplaces over time via a process known as radial migration, which blurs chemo–kinematic relations used for reconstructing the Milky Way (MW) formation history. To understand the true time evolution of the MW, …
View article: Why does the Milky Way have a bar?
Why does the Milky Way have a bar? Open
There is no doubt that the Milky Way is a barred galaxy; however, factors that establish its prominent morphology remain largely elusive. In this work, we attempt to constrain the history of the MW by tracing the present-day parameters and…
View article: Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way and Andromeda analogues
Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way and Andromeda analogues Open
Context. Recent works use a linear birth metallicity gradient to estimate the evolution of the [Fe/H] profile in the Galactic disk over time, and infer stellar birth radii ( R birth ) from [Fe/H] and age measurements. These estimates rely …
View article: LMC stars and where to find them: inferring birth radii for external galaxies
LMC stars and where to find them: inferring birth radii for external galaxies Open
It is well known that stars are subject to radial migration, i.e. over time, they move away from their birth location. This dynamical process tends to mix different stellar populations and hence hinders the determination of the true chemic…
View article: <i>Gaia</i> DR3 data consistent with a short bar connected to a spiral arm
<i>Gaia</i> DR3 data consistent with a short bar connected to a spiral arm Open
We use numerical simulations to model Gaia DR3 data with the aim of constraining the Milky Way (MW) bar and spiral structure parameters. We show that both the morphology and the velocity field in MW-like galactic disc models are strong fun…
View article: Chemical clocks and their time zones: understanding the [<i>s</i>/Mg]–age relation with birth radii
Chemical clocks and their time zones: understanding the [<i>s</i>/Mg]–age relation with birth radii Open
The relative enrichment of s-process to α-elements ([s/α]) has been linked with age, providing a potentially useful avenue in exploring the Milky Way’s chemical evolution. However, the age–[s/α] relationship is non-universal, with dependen…
View article: Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way/Andromeda analogues
Empirical derivation of the metallicity evolution with time and radius using TNG50 Milky Way/Andromeda analogues Open
Recent works have used a linear birth metallicity gradient to estimate the evolution of the [Fe/H] profile in the Galactic disk over time, and infer stellar birth radii (R$_\text{birth}$) from [Fe/H] and age measurements. These estimates r…
View article: A new stellar chemo-kinematic relation reveals the merger history of the milky way disk
A new stellar chemo-kinematic relation reveals the merger history of the milky way disk Open
The velocity dispersions of stars near the Sun are known to increase with stellar age, but age can be difficult to determine, so a proxy like the abundance of alpha elements (e.g., Mg) with respect to iron, [α/Fe], is used. Here we report …
View article: LMC Stars and Where to Find Them: Inferring Birth Radii for External Galaxies
LMC Stars and Where to Find Them: Inferring Birth Radii for External Galaxies Open
It is well known that stars move away from their birth location over time via radial migration. This dynamical process makes computing the correct chemical evolution, e.g., metallicity gradients, of galaxies very difficult. This dynamical …
View article: Gaia DR3 data consistent with a short bar connected to a spiral arm
Gaia DR3 data consistent with a short bar connected to a spiral arm Open
We use numerical simulations to model Gaia DR3 data with the aim of constraining the Milky Way bar and spiral structure parameters. We show that both the morphology and the velocity field in Milky Way-like galactic disc models are strong f…
View article: 2D chemical evolution models
2D chemical evolution models Open
Context. According to observations and numerical simulations, the Milky Way could exhibit several spiral-arm modes of various pattern speeds, with the slower patterns located at larger galactocentric distances. Aims. Our aim is to quantify…
View article: Beyond<i>Gaia</i>DR3: Tracing the [<i>α</i>/M] – [M/H] bimodality from the inner to the outer Milky Way disc with<i>Gaia</i>-RVS and convolutional neural networks
Beyond<i>Gaia</i>DR3: Tracing the [<i>α</i>/M] – [M/H] bimodality from the inner to the outer Milky Way disc with<i>Gaia</i>-RVS and convolutional neural networks Open
Context. In June 2022, Gaia DR3 provided the astronomy community with about one million spectra from the Radial Velocity Spectrometer (RVS) covering the CaII triplet region. In the next Gaia data releases, we anticipate the number of RVS s…
View article: 2D chemical evolution models II. Effects of multiple spiral arm patterns on O, Eu, Fe and Ba abundance gradients
2D chemical evolution models II. Effects of multiple spiral arm patterns on O, Eu, Fe and Ba abundance gradients Open
According to observations and numerical simulations, the Milky Way could exhibit several spiral arm modes with multiple pattern speeds, wherein the slower patterns are located at larger Galactocentric distances. Our aim is to quantify the …
View article: No memory of past warps in the vertical density structure of galaxies
No memory of past warps in the vertical density structure of galaxies Open
Warps are observed in a large fraction of disc galaxies, and can be due to a large number of different processes. Some of these processes might also cause vertical heating and flaring. Using a sample of galaxies simulated in their cosmolog…
View article: Dead man tells tales: metallicity distribution of the Milky Way stellar halo reveals the past of the GSE progenitor galaxy
Dead man tells tales: metallicity distribution of the Milky Way stellar halo reveals the past of the GSE progenitor galaxy Open
The Gaia-Sausage-Enceladus~(GSE) stands out as the largest known ancient accretion event in the Milky Way~(MW) history. Despite this significance, the parameters of its progenitor galaxy are still poorly constrained. We identify GSE stars …
View article: Why does the Milky Way have a bar?
Why does the Milky Way have a bar? Open
There is no doubt that the Milky Way is a barred galaxy; however, factors that establish its prominent morphology remain largely elusive and poorly comprehended. In this work, we attempt to constrain the history of the MW by tracing the pr…