Humna Awan
A5012627077- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Big Data Technologies and Applications
- Gaussian Processes and Bayesian Inference
- Scientific Research and Discoveries
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Radio, Podcasts, and Digital Media
- Superconducting and THz Device Technology
- Medical Imaging Techniques and Applications
- Parallel Computing and Optimization Techniques
- Advanced Measurement and Metrology Techniques
- Atmospheric and Environmental Gas Dynamics
- Industrial Vision Systems and Defect Detection
- Species Distribution and Climate Change
- Advanced Statistical Methods and Models
University of Michigan–Ann Arbor
2021-2024
Rutgers, The State University of New Jersey
2016-2022
Rutgers Sexual and Reproductive Health and Rights
2019-2020
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
Abstract In the era of precision cosmology, ensuring integrity data analysis through blinding techniques is paramount — a challenge particularly relevant for Dark Energy Spectroscopic Instrument (DESI). DESI represents monumental effort to map cosmic web, with goal measure redshifts tens millions galaxies and quasars. Given volume impact findings, potential confirmation bias poses significant challenge. To address this, we implement validate comprehensive blind strategy Data Release 1 (DR1),...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
The Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC) will use five cosmological probes: galaxy clusters, large scale structure, supernovae, strong lensing, and weak lensing. This Requirements Document (SRD) quantifies the expected dark energy constraining power of these probes individually together, with conservative assumptions about analysis methodology follow-up observational resources based on our current understanding evolution within field in coming...
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert Chile that promises to provide breakthrough discoveries fundamental physics, cosmology, and astrophysics. Supported by Foundation, Heising-Simons with contributions from collaborating institutions, SO will see first light 2021 start five year survey 2022. has 287 collaborators 12 countries 53 including 85 students 90 postdocs. its currently funded form...
Abstract We describe the simulated sky survey underlying second data challenge (DC2) carried out in preparation for analysis of Vera C. Rubin Observatory Legacy Survey Space and Time (LSST) by LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark LSST; DC2 program represents unique modeling effort that stresses this interconnectivity way has not been attempted before. This encompasses full end-to-end approach: starting...
We analyze the clustering of galaxies in first public data release HSC Subaru Strategic Program. Despite relatively small footprints observed fields, are an excellent proxy for deep photometric datasets that will be acquired by LSST, and therefore ideal test bed analysis methods being implemented LSST DESC. select a magnitude limited sample with $i<24.5$ it four redshift bins covering $0.15\lesssim z \lesssim1.5$. carry out Fourier-space two-point this sample, including all auto-...
The upcoming Large Synoptic Survey Telescope (LSST) will detect many strongly lensed Type Ia supernovae (LSNe Ia) for time-delay cosmography. This provide an independent and direct way measuring the Hubble constant H 0 , which is necessary to address current 4.4 σ tension in between local distance ladder early Universe measurements. We present a detailed analysis of different observing strategies (also referred as cadence strategy) LSST, quantify their impact on measurement multiple images...
ABSTRACT We present and validate 20 deg2 of overlapping synthetic imaging surveys representing the full depth Nancy Grace Roman Space Telescope High-Latitude Imaging Survey (HLIS) 5 yr observations Vera C. Rubin Observatory Legacy Time (LSST). The two are summarized, with reference to existing 300 LSST simulated produced as part Dark Energy Science Collaboration (DESC) Data Challenge 2 (DC2). Both observe same DESC DC2 universe. For survey, we simulate for first time fully chromatic images...
The Large Synoptic Survey Telescope (LSST) will survey the southern sky from 2022--2032 with unprecedented detail. Since observing strategy can lead to artifacts in data, we investigate effects of telescope-pointing offsets (called dithers) on $r$-band coadded 5$\sigma$ depth yielded after 10-year survey. We analyze this for several geometric patterns dithers (e.g., random, hexagonal lattice, spiral) amplitude as large radius LSST field-of-view, implemented different timescales (per season,...
The galaxy catalogs generated from low-resolution emission line surveys often contain both foreground and background interlopers due to misidentification, which can bias the cosmological parameter estimation. In this paper, we present a method for correcting interloper by using joint-analysis of auto- cross-power spectra main samples. particular, measure fractions cross-correlation between survey galaxies, because true must be negligibly small. estimated fractions, in turn, remove For...
ABSTRACT Data Challenge 1 (DC1) is the first synthetic data set produced by Rubin Observatory Legacy Survey of Space and Time (LSST) Dark Energy Science Collaboration (DESC). DC1 designed to develop validate reduction analysis study impact systematic effects that will affect LSST set. comprised r-band observations 40 deg2 10 yr depth. We present each stage simulation process: (a) generation, synthesizing sources from cosmological N-body simulations in individual sensor-visit images with...
The Vera C. Rubin Observatory's Legacy Survey of Space and Time is forecast to collect a large sample Type Ia supernovae (SNe Ia) that could be instrumental in unveiling the nature Dark Energy. feat, however, requires measuring two components Hubble diagram - distance modulus redshift with high degree accuracy. Distance estimated from SNe parameters extracted light curve fits, where average quality curves primarily driven by survey such as cadence number visits per band. An optimal observing...
The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will image billions astronomical objects in the wide-fast-deep primary survey a set minisurveys including intensive observations group deep drilling fields (DDFs). DDFs are critical piece three key aspects LSST Dark Energy Science Collaboration (DESC) cosmological measurements: they provide required calibration for photometric redshifts weak gravitational lensing measurements directly contribute to constraints from most...
Cosmology is one of the four science pillars LSST, which promises to be transformative for our understanding dark energy and matter. The LSST Dark Energy Science Collaboration (DESC) has been tasked with deriving constraints on cosmological parameters from data. Each probes heavily impacted by choice observing strategy. This white paper written DESC Observing Strategy Task Force (OSTF), represents entire collaboration, aims make recommendations strategy that will benefit all analyses LSST....
We review the measurements of dark energy enabled by observations Deep Drilling Fields and optimization survey design for cosmological measurements. This white paper is result efforts LSST DESC Observing Strategy Task Force (OSTF), which represents entire collaboration, aims to make recommendations on observing strategy DDFs that will benefit all analyses with LSST. It accompanied DESC-WFD (Lochner et al.). argue altering nominal deep drilling plan have $>6$ month seasons, interweaving $gri$...
With the advent of surveys containing millions to billions galaxies, it is imperative develop analysis techniques that utilize available statistical power. In galaxy clustering, even small sample contamination arising from distance uncertainties can lead large artifacts, which standard estimator does not account for. We first introduce a formalism, termed decontamination, corrects for by utilizing observed cross-correlations in contaminated samples; this any correlation function...
The generation-defining Vera C. Rubin Observatory will make state-of-the-art measurements of both the static and transient universe through its Legacy Survey for Space Time (LSST). With such capabilities, it is immensely challenging to optimize LSST observing strategy across survey's wide range science drivers. Many aspects relevant Dark Energy Science Collaboration, as survey footprint definition, single visit exposure time cadence repeat visits in different filters, are yet be finalized....
In preparation for cosmological analyses of the Vera C. Rubin Observatory Legacy Survey Space and Time (LSST), LSST Dark Energy Science Collaboration (LSST DESC) has created a 300 deg$^2$ simulated survey as part an effort called Data Challenge 2 (DC2). The DC2 sky survey, in six optical bands with observations following reference observing cadence, was processed Pipelines (19.0.0). this Note, we describe public data release resulting object catalogs coadded images five years along...
ABSTRACT The Legacy Survey of Space and Time (LSST) survey will provide unprecedented statistical power for measurements dark energy. Consequently, controlling systematic uncertainties is becoming more important than ever. LSST observing strategy affect the uncertainty systematics control many science cases; here, we focus on weak lensing (WL) systematics. fact that involves hundreds visits to same sky area provides new opportunities mitigation. We explore these by testing how different...
The LSST survey was designed to deliver transformative results for four primary objectives: constraining dark energy and matter, taking an inventory of the Solar System, exploring transient optical sky, mapping Milky Way. While Wide-Fast-Deep accompanying Deep Drilling mini-surveys will be ground-breaking each these areas, there remain competing demands on area, depth, temporal coverage amid a desire maximize all three. In this white paper, we seek address principal source tension between...
Large near-future galaxy surveys offer sufficient statistical power to make our cosmology analyses data-driven, limited primarily by systematic errors. Understanding the impact of systematics is therefore critical. We perform an end-to-end analysis investigate some that affect large-scale structure studies doing inference using simulated density maps with various systematics; these include caused photometric redshifts (photo-$z$s), Galactic dust, induced telescope observing strategy and...