Publications (68)
Optically selected fossil groups; X-ray observations and galaxy properties
Habib G. Khosroshahi, Ghassem Gozaliasl, Jesper Rasmussen +4
We report on the X-ray and optical observations of galaxy groups selected from the 2dfGRS group catalog, to explore the possibility that galaxy groups hosting a giant elliptical ga…
Clumps as multiscale structures in cosmic noon galaxies
Boris S Kalita, Tomoko L Suzuki, Daichi Kashino +31
Star-forming clumps have been found to significantly influence the star formation of gas-rich galaxies. Using public data from JWST/NIRCam (COSMOS-Web) and ALMA (FMOS-COSMOS)…
The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to
Sarah Leslie, Eva Schinnerer, Daizhong Liu +17
We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR) - stellar mass () relation, called the main sequence of star-forming g…
The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies -- IV. The star formation history of Andromeda VII derived from long period variable stars
Mahdieh Navabi, Elham Saremi, Atefeh Javadi +10
We have examined the star formation history (SFH) of Andromeda VII (And VII), the brightest and most massive dwarf spheroidal (dSph) satellite of the Andromeda galaxy (M 31). Altho…
COSMOS-Web: MIRI Data Reduction and Number Counts at 7.7m using JWST
Santosh Harish, Jeyhan S. Kartaltepe, Daizhong Liu +19
The COSMOS-Web survey is the largest JWST Cycle 1 General Observer program covering a contiguous ~0.54 deg area with NIRCam imaging in four broad-band filters and a non-contigu…
COSMOS Spectroscopic Redshift Compilation (First Data Release): 488k Redshifts Encompassing Two Decades of Spectroscopy
Ali Ahmad Khostovan, Jeyhan S. Kartaltepe, Mara Salvato +54
We present the COSMOS Spectroscopic Redshift Compilation encompassing ~ 20 years of spectroscopic redshifts within a 10 deg area centered on the 2 deg COSMOS legacy field.…
The COSMOS-Web deep galaxy group catalog up to
Greta Toni, Ghassem Gozaliasl, Matteo Maturi +41
Galaxy groups with and up to a few tens of members are the most common galaxy environment, marking the transition between field and massive clu…
The X-ray Integral Field Unit at the end of the Athena reformulation phase
Philippe Peille, Didier Barret, Edoardo Cucchetti +279
The Athena mission entered a redefinition phase in July 2022, driven by the imperative to reduce the mission cost at completion for the European Space Agency below an acceptable ta…
JWST and ALMA discern the assembly of structural and obscured components in a high-redshift starburst galaxy
Zhaoxuan Liu, John D. Silverman, Emanuele Daddi +27
We present observations and analysis of the starburst, PACS-819, at z=1.45 ( M), using high-resolution (; 0.8 kpc) ALMA and multi-wav…
Tracing the rise of supermassive black holes: A panchromatic search for faint, unobscured quasars at z > 6 with COSMOS-Web and other surveys
Irham T. Andika, Knud Jahnke, Masafusa Onoue +20
We report the identification of 64 new candidates of compact galaxies, potentially hosting faint quasars with bolometric luminosities of --10 erg s…
COSMOS Web: Morphological quenching and size-mass evolution of brightest group galaxies from z = 3.7
Ghassem Gozaliasl, Lilan Yang, Jeyhan Kartaltepe +47
We present a comprehensive study of the structural evolution of Brightest Group Galaxies (BGGs) from redshift to using the \textit{James Webb Space Telesc…
COSMOS-Web: An Overview of the JWST Cosmic Origins Survey
Caitlin M. Casey, Jeyhan S. Kartaltepe, Nicole E. Drakos +82
We present the survey design, implementation, and outlook for COSMOS-Web, a 255 hour treasury program conducted by the James Webb Space Telescope in its first cycle of observations…
Crimson Behemoth: a Massive Clumpy Structure Hosting a Dusty AGN at
Takumi S. Tanaka, John D. Silverman, Yurina Nakazato +40
The current paradigm for the co-evolution of galaxies and their supermassive black holes postulates that dust-obscured active galactic nuclei (AGNs) represent a transitional phase…
The relation up to through decomposition of COSMOS-Web NIRCam images
Takumi S. Tanaka, John D. Silverman, Xuheng Ding +25
Our knowledge of relations between supermassive black holes and their host galaxies at is still limited, even though being actively sought out to . Here, we use…
Brightest Group Galaxies: Stellar Mass and Star Formation Rate (paper I)
Ghassem Gozaliasl, Alexis Finoguenov, Habib G. Khosroshahi +3
We study the distribution and evolution of the stellar mass and the star formation rate (SFR) of the brightest group galaxies (BGGs) over using a large sample of $ 4…
The HYENAS project: a prediction for the X-ray undetected galaxy groups
Weiguang Cui, Fred Jennings, Romeel Dave +2
Galaxy groups contain the majority of bound mass with a significant portion of baryons due to the combination of halo mass and abundance (Cui 2024). Hence they serve as a crucial m…
The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging
James Nightingale, Guillaume Mahler, Jacqueline McCleary +27
We present the COSMOS-Web Lens Survey (COWLS), a sample of over 100 strong lens candidates from the \,deg COSMOS-Web survey, discovered using exquisite James Webb Space T…
Dust in the Average Galaxy: Attenuation, Emission, and Opacity from 0<z<7
Caitlin M. Casey, Hollis B. Akins, Andrew J. Battisti +43
We present constraints on the dust emission and attenuation properties of galaxies across 0<z<7 using JWST imaging from the COSMOS-Web Survey combined with deep FIR/(sub)millimeter…
COSMOS-Web: Unraveling the Evolution of Galaxy Size and Related Properties at
Lilan Yang, Jeyhan S. Kartaltepe, Maximilien Franco +26
We measure galaxy sizes from using COSMOS-Web, the largest-area JWST imaging survey to date, covering 0.54 deg. We analyze the rest-frame optical (~5000A) si…
COSMOS-Web: The over-abundance and physical nature of "little red dots"--Implications for early galaxy and SMBH assembly
Hollis B. Akins, Caitlin M. Casey, Erini Lambrides +38
JWST has revealed a population of compact and extremely red galaxies at , which likely host active galactic nuclei (AGN). We present a sample of 434 ``little red dots'' (LRDs)…
The design strategy of scientific data quality control software for Euclid mission
Massimo Brescia, Stefano Cavuoti, Terje Fredvik +7
The most valuable asset of a space mission like Euclid are the data. Due to their huge volume, the automatic quality control becomes a crucial aspect over the entire lifetime of th…
COSMOS-Web: does halo mass alone shape the clustering of star-forming and quiescent galaxies?
Louise Paquereau, Clotilde Laigle, Henry Joy McCracken +29
While stellar mass correlates strongly with halo mass, it remains unclear whether halo mass alone governs galaxy star-formation activity, or whether secondary halo properties and e…
Hot WHIM counterparts of FUV OVI absorbers: Evidence in the line-of-sight towards quasar 3C 273
Jussi Ahoranta, Jukka Nevalainen, Nastasha Wijers +7
We explore the high spectral resolution X-ray data towards the quasar 3C273 to search for signals of hot ( K) X-ray-absorbing gas co-located with two established inte…
Through Thick and Thin: The Cosmic Evolution of Disk Scale Height
Si-Yue Yu, Luis C. Ho, Takafumi Tsukui +16
To investigate the formation and evolution of vertical structures in disk galaxies, we measure global scale heights, averaging thin and thick components whe…
Large-Scale Structure in COSMOS-Web: Tracing Galaxy Evolution in the Cosmic Web up to with the Largest JWST Survey
Hossein Hatamnia, Bahram Mobasher, Sina Taamoli +31
We present a reconstruction of the large-scale structure using the James Webb Space Telescope's (JWST) COSMOS-Web program to trace environmentally driven galaxy evolution up to $z\…
ALMA and JWST Identification of Faint Dusty Star-Forming Galaxies up to z~8
Jorge A. Zavala, Andreas L. Faisst, Manuel Aravena +44
We exploit a new sample of around 400 bright dusty galaxies from the ALMA CHAMPS Large Program, together with the rich JWST multi-band data products in the COSMOS field, to explore…
Forged by Feedback: Stellar Properties of Brightest Group Galaxies in Cosmological Simulations
Ruxin Barré, Arif Babul, Ghassem Gozaliasl +7
We investigate how different galaxy formation models impact the stellar properties of brightest group galaxies (BGGs) in four cosmological simulations: ROMULUS, SIMBA, SIMBA-C, and…
COSMOS2020: Disentangling the Role of Mass and Environment in Star Formation Activity of Galaxies at
Sina Taamoli, Negin Nezhad, Bahram Mobasher +14
The role of internal and environmental factors in the star formation activity of galaxies is still a matter of debate, particularly at higher redshifts. Leveraging the most recent…
Revisiting mass-radius relationships for exoplanet populations: a machine learning insight
Mahdiyar Mousavi-Sadr, Davood M. Jassur, Ghassem Gozaliasl
The growing number of exoplanet discoveries and advances in machine learning techniques have opened new avenues for exploring and understanding the characteristics of worlds beyond…
The stellar mass function of quiescent and star-forming galaxies and its dependence on morphology in COSMOS-Web
Marko Shuntov, Olivier Ilbert, Claudia del P. Lagos +33
We study the stellar mass function (SMF) of quiescent and star-forming galaxies and its dependence on morphology in 10 redshift bins at using the COSMOS2025 catalog bui…
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…
On Soft Clustering For Correlation Estimators
Edward Berman, Sneh Pandya, Jacqueline McCleary +14
Properly estimating correlations between objects at different spatial scales necessitates distance calculations. For this reason, most widely adopted packages fo…
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…
The COSMOS-Web Lens Survey (COWLS) III: forecasts versus data
Natalie B. Hogg, James W. Nightingale, Quihan He +25
We compare forecasts for the abundance and properties of strong gravitational lenses in the COSMOS-Web survey, a deg survey of the COSMOS field using the NIRCam and MIRI…
Unveiling the distant Universe: Characterizing Galaxies in the first epoch of COSMOS-Web
Maximilien Franco, Hollis B. Akins, Caitlin M. Casey +47
We report the identification of 15 galaxy candidates at using the initial COSMOS-Web JWST observations over 77 arcmin through four NIRCam filters (F115W, F150W, F277W,…
COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction
Greta Toni, Matteo Maturi, Gianluca Castignani +33
We investigate the redshift and group richness dependence of the quiescent fraction and red-sequence (RS) parameters in COSMOS galaxy groups from z=0 to z=3.7. We analyzed the deep…
A multiwavelength study of an early galaxy group merger in COSMOS revealed by two tailed radio galaxies at z = 0.35
Paula VuliÄ, Vernesa SmolÄiÄ, Ghassem Gozaliasl +2
We report the discovery of two tailed radio galaxies in the COSMOS field, associated with a massive, dynamically unrelaxed galaxy group detected in X-rays at z = 0.349. One of them…
Radio spectral properties and aging of two tailed radio galaxies in a galaxy group at z=0.35
Paula VuliÄ, Vernesa SmolÄiÄ, Alexis Finoguenov +3
The paper analyzes two tailed radio galaxies in a galaxy group at redshift 0.35 using multi‑frequency VLA, MeerKAT, and GMRT data to measure their radio spectra, estimate spectral…
COSMOS-Web: Comprehensive Data Reduction for Wide-Area JWST NIRCam Imaging
Maximilien Franco, Caitlin M. Casey, Anton M. Koekemoer +37
We present the data reduction methodology used for the COSMOS-Web survey JWST NIRCam data. Covering 0.54 deg^2 with four broadband filters (F115W, F150W, F277W, F444W) and a total…
Not-so-little Red Dots: Two massive and dusty starbursts at z~5-7 pushing the limits of star formation discovered by JWST in the COSMOS-Web survey
Fabrizio Gentile, Caitlin M. Casey, Hollis B. Akins +24
We present the properties of two candidate massive () and dusty ( mag) galaxies at in the first 0.28 deg of the COSMOS-Web sur…
A Near-Infrared Faint, Far-Infrared-Luminous Dusty Galaxy at z~5 in COSMOS-Web
Jed McKinney, Sinclaire M. Manning, Olivia R. Cooper +32
A growing number of far-infrared bright sources completely invisible in deep extragalactic optical surveys hint at an elusive population of z>4 dusty, star-forming galaxies. Cycle…
The M*-Mhalo relation at 0.08 < z < 1.53 in COSMOS: the role of AGN radio-mode feedback
Eleni Vardoulaki, Ghassem Gozaliasl, Alexis Finoguenov +2
In the current picture of cosmology and astrophysics, the formation and evolution of galaxies is closely linked to that of their dark matter haloes. The best representation of this…
Bent it like FRs: extended radio AGN in the COSMOS field and their large-scale environment
Eleni Vardoulaki, Franco Vazza, Eric F. Jiménez-Andrade +3
One of the fascinating topics in radio astronomy is how to associate the complexity of observed radio structures to their environment, in order to understand their interplay and th…
Chandra centres for COSMOS X-ray galaxy groups: Differences in stellar properties between central dominant and offset brightest group galaxies
Ghassem Gozaliasl, Alexis Finoguenov, Masayuki Tanaka +24
We present the results of a search for galaxy clusters and groups in the square degree of the COSMOS field using all available X-ray observations from the XMM-Newton and Ch…
Behind the dust veil: A panchromatic view of an optically dark galaxy at z=4.82
Nikolaj B. Sillassen, Shuowen Jin, Georgios E. Magdis +30
Optically dark dusty star-forming galaxies (DSFGs) play an essential role in massive galaxy formation at early cosmic time, however their nature remains elusive. Here we present a…
Exoplanets Prediction in Multiplanetary Systems
Mahdiyar Mousavi-Sadr, Ghassem Gozaliasl, Davood M. Jassur
We present the results of a search for additional exoplanets in all multiplanetary systems discovered to date, employing a logarithmic spacing between planets in our Solar System k…
Unveiling Extended Components of 'Little Red Dots' in Rest-Frame Optical
Yiyang Zhang, Xuheng Ding, Lilan Yang +26
Recent JWST observations have revealed a population of red, compact, high-redshift objects called 'Little Red Dots'(LRD), whose host components have remained largely unconstrained,…
JWST Discovery of a High-Redshift Tidal Disruption Event Candidate in COSMOS-Web
Mitchell Karmen, Suvi Gezari, Erini Lambrides +26
The rates and properties of tidal disruption events (TDEs) provide valuable insights into their host galaxy central stellar densities and the demographics of their central supermas…
The Web Epoch of Reionization Lyman- Survey (WERLS) I. MOSFIRE Spectroscopy of Lyman- Emitters
Olivia R. Cooper, Caitlin M. Casey, Hollis B. Akins +33
We present the first results from the Web Epoch of Reionization Lyman- Survey (WERLS), a spectroscopic survey of Lyman- emission using Keck I/MOSFIRE and LRIS. WERLS target…
Clumpiness of galaxies revealed in the near-infrared with COSMOS-Web
Wilfried Mercier, Boris Sindhu Kalita, Marko Shuntov +30
Clumps in the rest-frame UV emission of galaxies have been observed for decades. Since the launch of the James Webb Space Telescope (JWST), a large population is detected in the re…
SCUBADive I: JWST+ALMA Analysis of 289 sub-millimeter galaxies in COSMOS-Web
Jed McKinney, Caitlin M. Casey, Arianna S. Long +36
JWST has enabled detecting and spatially resolving the heavily dust-attenuated stellar populations of sub-millimeter galaxies, revealing detail that was previously inaccessible. In…
Resolving galactic-scale obscuration of X-ray AGN at with COSMOS-Web
John D. Silverman, Vincenzo Mainieri, Xuheng Ding +25
A large fraction of the accreting supermassive black hole population is shrouded by copious amounts of gas and dust, particularly in the distant () Universe. While much…
A PAH deficit in the starburst core of a distant spiral galaxy
Zhaoxuan Liu, John D. Silverman, Emanuele Daddi +32
We present high-resolution and spatially-matched observations with JWST and ALMA of a starburst galaxy (PACS-830) at . The NIRCam observations mainly trace the stellar ligh…
Discovery of a Little Red Dot candidate at in COSMOS-Web based on MIRI-NIRCam selection
Takumi S. Tanaka, Hollis B. Akins, Yuichi Harikane +64
JWST has revealed a new high-redshift population called little red dots (LRDs). Since LRDs may be in the early phase of black hole growth, identifying them in the early universe is…
Core to Cosmic Edge: SIMBA-C's New Take on Abundance Profiles in the Intragroup Medium at z = 0
Aviv Padawer-Blatt, Zhiwei Shao, Renier T. Hough +9
We employ the SIMBA-C cosmological simulation to study the impact of its upgraded chemical enrichment model (Chem5) on the distribution of metals in the intragroup medium (IGrM). W…
Hidden in Pixels I: Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales
Takumi S. Tanaka, John D. Silverman, Kazuhiro Shimasaku +56
``Little Red Dots'' (LRDs) are an abundant high-redshift population newly discovered by the James Webb Space Telescope (JWST) and considered to be an early growth phase of supermas…
An ultra-high-resolution map of (dark) matter
Diana Scognamiglio, Gavin Leroy, David Harvey +38
Ordinary matter-including particles such as protons and neutrons-accounts for only about one sixth of all matter in the Universe. The rest is dark matter, which does not emit or ab…
Physical properties of galaxies and the UV Luminosity Function from to in COSMOS-Web
Maximilien Franco, Caitlin M. Casey, Hollis B. Akins +37
We present measurements of the rest-frame ultraviolet luminosity function (UVLF) in three redshift bins over -14 from the JWST COSMOS-Web survey. Our samples, selected us…
SCUBADive II: Searching for Dust-Obscured Galaxies via F150W-Dropouts in COSMOS-Web
Sinclaire M. Manning, Jed McKinney, Katherine E. Whitaker +24
The relative fraction of obscured galaxies at compared to lower redshifts remains highly uncertain as accurate bookkeeping of the dust-obscured component proves difficult. We…
Brightest group galaxies-II: the relative contribution of BGGs to the total baryon content of groups at z<1.3
Ghassem Gozaliasl, Alexis Finoguenov, Habib G. Khosroshahi +6
We performed a detailed study of the evolution of the star formation rate (SFR) and stellar mass of the brightest group galaxies (BGGs) and their relative contribution to the total…
Two massive, compact, and dust-obscured candidate galaxies discovered by JWST
Hollis B. Akins, Caitlin M. Casey, Natalie Allen +56
We present a search for extremely red, dust-obscured, galaxies with /NIRCam+MIRI imaging over the first 20 arcmin of publicly-available Cycle 1 data from t…
Exoplanetary radio emission predictions and detectability in the SKA era
Mahdiyar Mousavi-Sadr, Fatemeh S. Tabatabaei, Alexander Wolszczan +1
Radio observations provide a window into a planet's interior and play a crucial role in studying its atmosphere and surface, key factors to find potential habitability. The discove…
The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies. I. Survey overview and first results for Andromeda I
Elham Saremi, Atefeh Javadi, Jacco Th. van Loon +10
An optical monitoring survey in the nearby dwarf galaxies was carried out with the 2.5-m Isaac Newton Telescope (INT). 55 dwarf galaxies and four isolated globular clusters in the…
Uncovering a Massive z~7.7 Galaxy Hosting a Heavily Obscured Radio-Loud QSO Candidate in COSMOS-Web
Erini Lambrides, Marco Chiaberge, Arianna Long +47
In this letter, we report the discovery of the highest redshift, heavily obscured, radio-loud AGN candidate selected using JWST NIRCam/MIRI, mid-IR, sub-mm, and radio imaging in th…
COSMOS2025: The COSMOS-Web galaxy catalog of photometry, morphology, redshifts, and physical parameters from JWST, HST, and ground-based imaging
Marko Shuntov, Hollis B. Akins, Louise Paquereau +55
We present COSMOS2025, the COSMOS-Web catalog of photometry, morphology, photometric redshifts and physical parameters for more than 700,000 galaxies in the Cosmic Evolution Survey…
On the reliability of photometric and spectroscopic tracers of halo relaxation
Mohammad H. Zhoolideh Haghighi, Mojtaba Raouf, Habib. G. Khosroshahi +2
We characterize the relaxation state of galaxy systems by providing an assessment of the reliability of the photometric and spectroscopic probe via the semi-analytic galaxy evoluti…
EELG1002: A Record-Breaking [OIII]+H EW Ã ~Galaxy at -- Analog of Early Galaxies?
Ali Ahmad Khostovan, Jeyhan S. Kartaltepe, Malte Brinch +6
We present a detailed analysis of EELG1002: a EELG identified within archival Gemini/GMOS spectroscopy as part of the on-going COSMOS Spectroscopic Archive. We find EE…
The COSMOS-Web Lens Survey (COWLS) II: depth, resolution, and NIR coverage from JWST reveal 17 spectacular lenses
Guillaume Mahler, James W. Nightingale, Natalie B. Hogg +27
The COSMOS-Web Lens Survey (COWLS) presents the first systematic search for strong gravitational lenses in the COSMOS-Web field using data from the \textit{James Webb} Space Telesc…