I will present high-resolution millimeter images of dust and gas in high-redshift dusty star-forming galaxies (DSFGs). SPT0418-47 ($z \approx$ 4.22) and SPT2147-50 ($z \approx 3.76$) are two of the most well-studied gravitationally lensed, high-redshift DSFGs selected by the South Pole Telescope. Using Atacama Large Millimeter/submillimeter Array (ALMA) observations of these galaxies, I create...
The BICEP3 telescope is a 95GHz CMB polarimeter located at the South Pole searching for inflationary gravitational waves. Directly measuring non-idealities in polarization between detector pairs and across the focal plane is useful for understanding how our constraints on r are impacted by E-to-B leakage. Further, measuring polarization angles in an absolute reference frame makes telescopes...
The kinetic Sunyaev-Zel'dovich effect (kSZ) and patchy screening effect are two complementary cosmic microwave background (CMB) probes of the reionization era. The kSZ effect is a relatively strong signal, but is difficult to disentangle from other sources of temperature anisotropy, whereas patchy screening is weaker but can be reconstructed using the cleaner polarization channel. Here, we...
As they travel through the Universe, a small fraction of cosmic microwave background (CMB) photons scatter off free electrons from the gaseous halos of moving galaxies leaving a temperature signal: the kinematic Sunyaev-Zel'dovich effect (kSZ). In this work, we precisely measure this effect with velocity stacking to infer gas profiles around galaxies and their dependence on galaxy properties,...
For years, pairs of clusters have been studied in a wide range of frequencies to try to detect filaments of matter between them using. X-ray emission, the Sunyaev-Zel'dovich (SZ) effect and radio emission have all been used. Such studies are closely connected to the ‘missing baryon’ problem, an open issue in modern cosmology: the quantity of baryonic matter observed in the local Universe is...
Cold fronts in galaxy clusters, seen as sharp discontinuities in X-ray surface brightness and temperature, offer crucial insights into the physical processes shaping the intracluster medium (ICM). These structures not only trace a cluster’s dynamical history but also serve as natural laboratories for studying transport processes such as thermal conduction. In this talk, we investigate the...
Filaments connecting galaxy clusters appear to contain the vast majority of the ‘missing baryons’ in the form of a warm-hot intergalactic medium (WHIM) gas and are expected to emit a diffuse soft X-ray signal. Utilizing eROSITA’s sensitivity in the soft X-ray band, down to 0.2 keV, along with its wide field of view, raster scanning, and stable background, we are able to characterize this...
As CMB telescopes—such as the current and upcoming BICEP/Keck instruments and the future CMB‐S4 experiment—strive to measure primordial B-modes via precise polarimetry, rigorous characterization of optical materials under cryogenic conditions is increasingly critical. For instance, losses in transmissive optics elevate photon noise, degrading mapping speed and overall sensitivity. Meeting the...
In this work, I use simulations from The 300 Project to connect morphological measures and statistics of the stellar light distribution with physical processes in cluster formation. Specifically, I investigate systematic changes in the stellar density map distribution due to mechanisms such as merger and accretion histories of the galaxy clusters. The results of this investigation can then be...
Component separation is critical in CMB data analysis to clean foregrounds from CMB. The deep convolutional neural networks (CNN) have been increasingly useful in image segmentation problems of various fields to reconstruct the signal. I have built a hybrid CNN architecture in wavelet space (specifically in Needlet space ) to separate foregrounds from CMB that works in multi-resolution...
Halo core tracking is a novel concept designed to efficiently follow halo substructure in large simulations. We have recently developed this concept in gravity-only simulations to investigate the galaxy-halo connection in the context of empirical and semi-analytic models. Here, we incorporate information from hydrodynamics simulations, with an emphasis on establishing a connection between...
Most of the instruments currently observing at mm wavelenghts are located in the Southern Hemisphere. Those few in the Northern Hemisphere are mostly focused on observations of large scale CMB anisotropies with small aperture telescopes (e.g. AliCMB, GroundBIRD). Therefore, there is a gap for an instrument with a large mirror ($D\geq10\,$m) that would survey the Northern sky.
We propose a...
Cross-correlation/stacking analyses of Sunyaev-Zeldovich observations and galaxy surveys offer a promising method for studying properties of the gas reservoirs surrounding galaxies and the astrophysics that govern their evolution. These statistical studies can be used to constrain models and simulations through a detailed forward model, but the implementation and systematics of constructing a...
The Millimeter Sardinia radio Telescope Receiver based on Array of Lumped elements kids is (MISTRAL) is a novel high resolution, wide field of view millimeter camera currently installed at the Sardinia Radio Telescope (SRT), a 64 m fully steerable gregorian radio telescope located in Italy. MISTRAL was developed in the framework of the SRT-HighFreq project, funded by a National Operational...
Galaxy cluster scaling relations are fundamental for understanding cluster physics and testing ΛCDM, but their use in cosmology is still limited by large uncertainties. Many studies rely on hydrostatic equilibrium, despite numerous out-of-equilibrium systems, and the classification of cluster dynamical states remains incomplete, particularly for intermediate evolutionary stages. Even...
Galaxy clusters are powerful probes of the large-scale structure of the universe and cosmology, with their population statistics being highly dependent on the expansion history of the universe and growth of structure. In the last few decades, galaxy cluster samples across wavelengths have exceeded thousands of objects, including those identified in the millimeter regime through the use of the...
We present an open source Python package to compare simulation-based inference (SBI) approaches to MCMC inference in the context of galaxy cluster mass estimates from gravitational weak lensing data. The package, CLSBIWeakLens, provides a modular framework to flexibly run numerical experiments on cluster mass estimation from radial profiles, a typical data vector in optical cluster cosmology...
State-of-the-art cosmic microwave background (CMB) telescopes must deploy receivers with a high density of superconducting detectors. Reading out these detectors while maintaining cryogenic conditions requires novel multiplexing schemes. Microwave superconducting quantum interference device multiplexing has been shown to achieve multiplexing factors on the order of 1,000, which is a drastic...
The Simons Observatory (SO) consists of one large aperture and three small aperture telescopes currently operating in four frequency bands between 90-280 GHz, located at ∼5,200m altitude in the Atacama Desert of Chile. SO is dedicated to observing the polarized cosmic microwave background (CMB), among other science goals, with the primary focus of the small aperture telescopes (SATs) being to...
Spatially and spectrally resolved observations of the thermal and kinematic Sunyaev-Zel’dovich (SZ) effect towards galaxy clusters are crucial for understanding their formation and assembly history. Current instrumentation for direct observations of the SZ effect in the mm/submm rely either on coherent receivers or on imaging cameras. Coherent receivers can achieve a high spectral resolution,...
We present a weak lensing analysis pipeline developed for SuperBIT, a balloon-borne telescope that operates at ~36 km altitude, above 97-99% of the Earth’s atmosphere. SuperBIT completed its first science flight in 2023, delivering high-quality imaging at a fraction of space-mission costs. The pipeline involves stacking 300-second exposures, extracting sources, modeling the PSF, measuring...
Accurate characterization of galaxy clusters in millimetre-wavelength surveys requires rigorous separation of the thermal Sunyaev-Zeldovich (tSZ) distortion of the CMB signal from its contaminants. This task should ideally disentangle extended components, such as Galactic dust, Cosmic Microwave, and sub-millimetre backgrounds, whose spectral shapes and spatial distributions exhibit specific...
In this talk I will discuss the planned daily public release of monitored source light curves and transient alerts from the (Advanced) Simons Observatory provided by daily survey-scale observations in the millimeter. The scan strategy for the Large Aperture Telescope (LAT) is designed to cover a high fraction of the survey volume once every few days, providing excellent coverage of...
To understand the evolution of dust properties in molecular clouds in the course of the star formation process, we constrain the changes in the dust emissivity index from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using the NIKA2 continuum camera on the IRAM 30 m telescope as part of the GASTON large program, we observed the B211/B2I3 filament in Taurus at...
Future photometric and spectroscopic surveys will reveal unprecedented details about faint galaxies in massive clusters, requiring high-resolution theoretical models. Full-physics hydrodynamical simulations accurately reproduce galaxy properties but are computationally expensive, particularly for resolving low-mass galaxies in dense environments. In this work, we present an emulator based on...
Distant quasars (QSOs) are considered key actors in the evolution of the early Universe. High-redshift merging systems, containing two or more supermassive black holes surrounded by close companions, tidal bridges, and tails on kiloparsec scales, represent an expected phenomenon, as evidenced by the first spatially resolved spectroscopic observations from the James Webb Space Telescope (JWST)....
In our previous work, we estimated the masses of galaxy clusters from the PSZ2 full-sky sample using deep learning methods (arXiv:2209.10333). Our approach involved generating a simulated training dataset that closely replicated PSZ2 observations, accounting for instrumental effects such as noise and the point spread function (PSF). However, certain factors,...
