173 citations · 940 across the 50 of their papers we have counts for
51 papers
CatBoost versus Spectral Energy Distribution-Fitting: Estimating Galaxy Properties under Controlled Photometric Incompleteness
Vahid Asadi, Hosein Haghi, Akram Hasani Zonoozi
Estimating galaxy physical parameters from photometric data is fundamentally challenged by missing measurements that are endemic to astronomical surveys. Using a mock catalog from…
COSMOS2025: A Machine Learning Census of Massive Quiescent Galaxies at
Vahid Asadi, Hosein Haghi, Akram Hasani Zonoozi
The existence of massive quiescent galaxies at high redshifts () strongly constrains the rapid quenching mechanisms in galaxy evolution models. We present a ma…
Baryonic mass budgets in the central regions of the Bullet Cluster and their consistency with strong lensing in MOND
Dong Zhang, Hosein Haghi, Elena Asencio +8
Strong lensing observations of the Bullet Cluster have traditionally been regarded as strong evidence for dark matter and a major challenge to Milgromian dynamics (MOND). The offse…
The fingerprint of primordial mass segregation on the tidal tails of star clusters
S. Mojtaba Ghasemi, Hosein Haghi, Mohammad Mansoury +3
We investigate the effect of primordial mass segregation (PMS) in shaping the tidal tail structures of star clusters, searching for any trace of PMS on the tails at both early and…
The mmax-Mecl relation in the LEGUS clusters
Marie Zinnkann, Tereza Jerabkova, Zhiqiang Yan +6
The relation between the maximum stellar mass in a very young cluster (mmax) and the total stellar mass of the cluster (Mecl), known as the mmax-Mecl relation, remains debated in t…
Revisiting the missing mass problem in MOND for nearby galaxy clusters
Dong Zhang, Akram Hasani Zonoozi, Pavel Kroupa
In the framework of Milgromian dynamics (MOND), galaxy clusters are known to exhibit a residual missing mass problem, with the baryonic mass falling short of the dynamical mass by…
Machine Learning vs. Spectral Energy Distribution Fitting: A Comparative Analysis of Accuracy in Stellar Mass Estimation
Vahid Asadi, Akram Hasani Zonoozi, Hosein Haghi
Traditional spectral energy distribution (SED)-fitting methods for stellar mass estimation face persistent challenges including systematic biases and computational constraints. We…
Universal depletion of metal-poor globular clusters in inner galaxy regions: Fossil record of black hole retention
Ali Rostami-Shirazi, Narges Rostami, Hosein Haghi +1
We analyzed the spatial distribution of globular cluster (GC) systems across 37 host galaxies in a two dimensional parameter space defined by projected galactocentric distance Rg a…
Massive Star Formation at Supersolar Metallicities: Constraints on the Initial Mass Function
Eda Gjergo, Zhiyu Zhang, Pavel Kroupa +6
Metals enhance the cooling efficiency of molecular clouds, promoting fragmentation. Consequently, increasing the metallicity may boost the formation of low-mass stars. Within the i…
Machine Learning Classification of COSMOS2020 Galaxies: Quiescent vs. Star-Forming
Vahid Asadi, Nima Chartab, Akram Hasani Zonoozi +4
Accurately distinguishing between quiescent and star-forming galaxies is essential for understanding galaxy evolution. Traditional methods, such as spectral energy distribution (SE…
Origin of High Dark Remnant Fractions in Milky Way Globular Clusters: The Crucial Role of Initial Black Hole Retention
Ali Rostami-Shirazi, Holger Baumgardt, Akram Hasani Zonoozi +2
Comparing the dynamical and stellar masses of Milky Way (MW) globular clusters (GCs) reveals a discrepancy exceeding a factor of two. Since this substantial invisible mass is conce…
Dark Star Clusters or Ultra-Faint Dwarf galaxies? Revisiting UMa3/U1
Ali Rostami-Shirazi, Hosein Haghi, Akram Hasani Zonoozi +1
Owing to sparse spectroscopic observations, the classification of faint satellites as either dark matter-dominated dwarf galaxies or self-gravitating star clusters remains unresolv…
Are the ONC, Pleiades, and Hyades snapshots of the same embedded cluster?
Ghasem Safaei, Hosein Haghi, Akram Hasani Zonoozi +1
Using direct -body simulations, we investigate the initial conditions and evolution of a star-forming region resembling the Orion Nebula Cluster (ONC) with the advanced \textsc{…
The effect of the environment-dependent stellar initial mass function on the baryonic Tully Fisher relation
Akram Hasani Zonoozi, Hosein Haghi, Pavel Kroupa +4
We investigate the impact of an environment-dependent galaxy-wide stellar initial mass function (gwIMF) on the baryonic Tully-Fisher relation (BTFR). The integrated galaxy-wide IMF…
Semi-supervised classification of stars, galaxies and quasars using K-means and random-forest approaches
Vahid Asadi, Hosein Haghi, Akram Hasani Zonoozi
Classifying stars, galaxies, and quasars is essential for understanding cosmic structure and evolution; however, the vast data from modern surveys make manual classification imprac…
Leveraging Machine Learning for Accurate and Fast Stellar Mass Estimation of Galaxies
Vahid Asadi, Akram Hasani Zonoozi, Hosein Haghi +4
Unveiling the evolutionary history of galaxies necessitates a precise understanding of their physical properties. Traditionally, astronomers achieve this through spectral energy di…
COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps
Fatemeh Abedini, Ghassem Gozaliasl, Akram Hasani Zonoozi +38
The COSMOS-Web survey, with its unparalleled combination of multiband data, notably, near-infrared imaging from JWST's NIRCam (F115W, F150W, F277W, and F444W), provides a transform…
Stellar population synthesis models with a physically varying IMF
Akram Hasani Zonoozi, Hosein Haghi, Pavel Kroupa
Interpreting galactic luminosity requires assumptions about the galaxy-wide initial mass function (gwIMF), often assumed invariant in most stellar population synthesis (SPS) models…
Origin of the metal-rich vs. metal-poor globular clusters dichotomies in the Milky Way: A sign of low black hole natal kicks
Ali Rostami-Shirazi, Akram Hasani Zonoozi, Hosein Haghi +1
The bimodal metallicity distribution of globular clusters (GCs) in massive galaxies implies two distinct sub-populations: metal-poor and metal-rich. Using the recent data of \texti…
Has the Palomar 14 globular cluster been captured by the Milky Way?
Akram Hasani Zonoozi, Maliheh Rabiee, Hosein Haghi +1
We examine a new scenario to model the outer halo globular cluster (GC) Pal 14 over its lifetime by performing a comprehensive set of direct N-body calculations. We assume Pal 14 w…
The formation and evolution of dark star clusters II: The impact of primordial mass segregation
S. Mojtaba Ghasemi, Ali Rostami-Shirazi, Pouria Khalaj +2
We investigate the impact of primordial mass segregation on the formation and evolution of dark star clusters (DSCs). Considering a wide range of initial conditions, we conducted $…
The impact of a top-heavy IMF on the formation and evolution of dark star clusters
Ali Rostami Shirazi, Hosein Haghi, Akram Hasani Zonoozi +2
The Spitzer instability leads to the formation of a black hole sub-system (BHSub) at the center of a star cluster providing energy to luminous stars (LSs) and increasing their rate…
Has JWST already falsified dark-matter-driven galaxy formation?
Moritz Haslbauer, Pavel Kroupa, Akram Hasani Zonoozi +1
The James Webb Space Telescope (JWST) discovered several luminous high-redshift galaxy candidates with stellar masses of at photometric red…
Asymmetrical tidal tails of open star clusters: stars crossing their cluster's prah challenge Newtonian gravitation
Pavel Kroupa, Tereza Jerabkova, Ingo Thies +14
After their birth a significant fraction of all stars pass through the tidal threshold (prah) of their cluster of origin into the classical tidal tails. The asymmetry between the n…