A5015970622- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Atmospheric and Environmental Gas Dynamics
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Advanced Thermodynamic Systems and Engines
- Geochemistry and Geologic Mapping
- Spacecraft and Cryogenic Technologies
- Computational Physics and Python Applications
- Climate variability and models
New York University
2021-2024
Canadian Institute for Theoretical Astrophysics
2017-2022
Flatiron Health (United States)
2021-2022
Flatiron Institute
2021-2022
University of Toronto
2019-2021
Canadian Institute for Advanced Research
2020
Johns Hopkins University
2013-2018
Following the first two annual intensity mapping workshops at Stanford in March 2016 and Johns Hopkins June 2017, we report on recent advances theory, instrumentation observation that were presented these meetings some of opportunities challenges identified looking forward. With preliminary detections CO, [CII], Lya low-redshift 21cm, a host experiments set to go online next few years, field is rapidly progressing all fronts, with great anticipation for flood new exciting results. This...
We examine how future gravitational-wave measurements from merging black holes (BHs) can be used to infer the shape of black-hole mass function, with important implications for study star formation and evolution properties binary BHs. model function as a power law, inherited stellar initial introduce lower upper cutoff parameterizations in order probe minimum maximum BH masses allowed by evolution, respectively. initially focus on heavier each binary, minimize dependence. Taking into account...
Abstract We present a detailed overview of the science goals and predictions for Prime-Cam direct-detection camera–spectrometer being constructed by CCAT-prime collaboration dedicated use on Fred Young Submillimeter Telescope (FYST). The FYST is wide-field, 6 m aperture submillimeter telescope built (first light in late 2023) an international consortium institutions led Cornell University sited at more than 5600 Cerro Chajnantor northern Chile. one two instruments planned will provide...
Abstract The CO Mapping Array Project (COMAP) aims to use line-intensity mapping of carbon monoxide (CO) trace the distribution and global properties galaxies over cosmic time, back Epoch Reionization (EoR). To validate technologies techniques needed for this goal, a Pathfinder instrument has been constructed fielded. Sensitive CO(1–0) emission from z = 2.4–3.4 fainter contribution CO(2–1) at 6–8, is surveying 12 deg 2 in 5 yr observing campaign detect signal ∼ 3. Using data first 13 months...
We present a study of the feasibility an intensity-mapping survey targeting 115 GHz CO(1-0) rotational transition at $z\sim3$. consider four possible models and estimate spatial angular power spectra CO fluctuations predicted by each them. The frequency bandwidths most proposed intensity mapping spectrographs are too small to use Limber approximation calculate spectrum, so we alternative method for calculating spectrum. span two orders magnitude in signal amplitude, there is significant...
Line-intensity mapping (LIM) provides a promising way to probe cosmology, reionization and galaxy evolution. However, its sensitivity cosmology astrophysics at the same time is also nuisance. Here we develop comprehensive framework for modelling LIM power spectrum, which includes redshift space distortions Alcock-Paczynski effect. We then identify isolate degeneracies with so that they can be marginalized over. study gains of using multipole expansion anisotropic providing an accurate...
Abstract We present the current state of models for z ∼ 3 carbon monoxide (CO) line intensity signal targeted by CO Mapping Array Project (COMAP) Pathfinder in context its early science results. Our fiducial model, relating dark matter halo properties to luminosities, informs parameter priors with empirical galaxy–halo connection and previous (1–0) observations. The data spanning wavenumbers k = 0.051–0.62 Mpc −1 represent first direct 3D constraint on clustering component power spectrum....
Abstract Submillimeter emission lines produced by the interstellar medium (ISM) are strong tracers of star formation and some main targets line intensity mapping (LIM) surveys. In this work we present an empirical multiline model that simultaneously covers mean, scatter, correlations [C ii ], CO J = 1–0 to 5–4, i ] in redshift range 1 ≤ z 9. We assume galaxy ISM luminosity versus halo mass relations can be described double power laws with redshift-dependent lognormal scatter. The parameters...
Abstract This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its...
We introduce COMAP-EoR, the next generation of Carbon Monoxide Mapping Array Project aimed at extending CO intensity mapping to Epoch Reionization. COMAP-EoR supplements existing 30 GHz COMAP Pathfinder with two additional instruments and a new 16 receiver. This combination frequencies will be able simultaneously map CO(1--0) CO(2--1) reionization redshifts ($z\sim5-8$) in addition providing significant boost $z\sim3$ sensitivity Pathfinder. examine set models EoR signal, find power spectra...
Abstract We present the power spectrum methodology used for first-season COMAP analysis, and assess quality of current data set. The main results are derived through Feed–Feed Pseudo-Cross-Spectrum (FPXS) method, which is a robust estimator with respect to both noise modeling errors experimental systematics. use effective transfer functions take into account effects instrumental beam smoothing various filter operations applied during low-level processing. spectra estimated in this way have...
We address the problem of line confusion in intensity-mapping surveys and explore possibility to mitigate foreground contamination by progressively masking brightest pixels observed map. consider experiments targeting CO(1–0) at z = 3, Ly α 7, C ii use simulated intensity maps, which include both clustering shot-noise components signal possible foregrounds, order test efficiency our method. find that for CO α, it is quite remove most contribution from maps via only 1–3 per cent pixel...
In the next few years, intensity-mapping surveys that target lines such as CO, Lyα and C ii stand to provide powerful probes of high-redshift astrophysics. However, these line emissions are highly non-Gaussian, so typical power-spectrum methods used study maps will leave out a significant amount information. We propose new statistic, probability distribution voxel intensities, which can access this extra Using model CO intensity map at z ∼ 3 an example, we demonstrate (VID) provides...
Line-Intensity Mapping is an emerging technique which promises new insights into the evolution of Universe, from star formation at low redshifts to epoch reionization and cosmic dawn. It measures integrated emission atomic molecular spectral lines galaxies intergalactic medium over a broad range frequencies, using instruments with aperture requirements that are greatly relaxed relative surveys for single objects. A coordinated, comprehensive, multi-line intensity-mapping experimental effort...
Line-intensity mapping (LIM or IM) is an emerging field of observational work, with strong potential to fit into a larger effort probe large-scale structure and small-scale astrophysical phenomena using multiple complementary tracers. Taking full advantage such complementarity means, in part, undertaking line-intensity surveys galaxy mind. We consider the for detection cross-correlation signal between COMAP blind based on photometric redshifts (as COSMOS) spectroscopic data HETDEX survey...
Line-intensity mapping (LIM) of emission from star-forming galaxies can be used to measure the baryon acoustic oscillation (BAO) scale as far back epoch reionization. This provides a standard cosmic ruler constrain expansion rate Universe at redshifts which cannot directly probed otherwise. In light growing tension between measurements current using local distance ladder and those inferred microwave background, extending constraints on history bridge late early is paramount importance. Using...
ABSTRACT We forecast the ability of future-generation experiments to detect fine-structure lines carbon and oxygen ions, [C ii] [O iii] in intensity mapping (IM) from Epoch Reionization (z ∼ 6–8). Combining latest empirically derived constraints relating luminosity line ambient star formation rate, using them conjunction with previously estimates for abundance haloes, we predict expected autocorrelation IM signal be observed new based on Fred Young Submillimetre Telescope (FYST)...
The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne cryogenic telescope that will survey the spectrum of diffuse emission from both Milky Way and cosmic web to probe star formation, interstellar medium, galaxy evolution across time. EXCLAIM's primary extragalactic science maps 305 deg$^2$ along celestial equator with an R=512 spectrometer over frequency range \nu=420-540 GHz, targeting [CII] line redshifts 2.5<z<3.5 several CO lines z<1....
We present the detailed science case, and brief descriptions of telescope design, site, first light instrument plans for a new ultra-wide field submillimeter observatory, CCAT-prime, that we are constructing at 5600 m elevation site on Cerro Chajnantor in northern Chile. Our goals to study star galaxy formation from epoch reionization present, investigate growth structure Universe, improve precision B-mode CMB measurements, interstellar medium Galaxy nearby galaxies through spectroscopic,...
Current models of galaxy formation require star in high-mass galaxies to be limited by poorly understood mechanisms quasar feedback. Feedback processes can studied examining the molecular gas content AGN hosts through CO rotational ladder, but complexity these observations means that current data are only extremely CO-bright objects. Upcoming intensity mapping experiments offer an opportunity for a less biased probe By correlating maps with spectroscopic surveys, we obtain measurement mean...
Line-intensity mapping observations will find fluctuations of integrated line emission are attenuated by varying degrees at small scales due to the width profiles. This attenuation may significantly impact estimates astrophysical or cosmological quantities derived from measurements. We consider a theoretical treatment effect broadening on both clustering and shot-noise components power spectrum generic line-intensity using halo model. then possible simplifications allow easier application in...
Primordial non-Gaussianity (PNG) is a key probe of the origins primordial fluctuations in early universe. It has been shown that multitracer measurements large-scale structure can produce high-precision PNG. Future line intensity mapping surveys are well suited to these owing their ability rapidly survey large volumes and access scales at which PNG becomes important. In this paper, we explore for first time how with depend on sub-galactic scale physics drives emission. We consider an example...
The experiment for cryogenic large-aperture intensity mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation in windows from the present z = 3.5. During this time, rate of dropped dramatically, while dark matter continued cluster. EXCLAIM maps redshifted emission singly ionized carbon lines and monoxide using mapping, which permits blind complete emitting gas through statistics cumulative brightness fluctuations. achieves high sensitivity coupled six integrated...
We describe the first season COMAP analysis pipeline that converts raw detector readouts to calibrated sky maps. This implements four main steps: gain calibration, filtering, data selection, and map-making. Absolute calibration relies on a combination of instrumental astrophysical sources, while relative exploits real-time total-power variations. High efficiency filtering is achieved through spectroscopic common-mode rejection within across receivers, resulting in nearly uncorrelated white...
We present early results from the COMAP Galactic Plane Survey conducted between June 2019 and April 2021, spanning $20^\circ<\ell<40^\circ$ in longitude $|b|<1.\!\!^{\circ}5$ latitude with an angular resolution of $4.5^{\prime}$. The full survey will span $\ell \sim 20^{\circ}$- $220^{\circ}$ be first large-scale radio continuum at $30$ GHz sub-degree resolution. initial part survey, including diffuse emission spectral energy distributions (SEDs) HII regions supernova remnants. Using low...