Adam Broussard
A5038181582- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Medical Imaging Techniques and Applications
- Advanced Vision and Imaging
- Academic Publishing and Open Access
- Astrophysics and Cosmic Phenomena
- Gaussian Processes and Bayesian Inference
- Advanced X-ray Imaging Techniques
- Anomaly Detection Techniques and Applications
- Atmospheric and Environmental Gas Dynamics
- Cosmology and Gravitation Theories
- Inertial Sensor and Navigation
- Advanced Statistical Methods and Models
- Radio Frequency Integrated Circuit Design
- Photocathodes and Microchannel Plates
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Infrared Target Detection Methodologies
- Particle Detector Development and Performance
- Advanced Image Processing Techniques
Rutgers, The State University of New Jersey
2017-2024
Rutgers Sexual and Reproductive Health and Rights
2019-2021
Mitchell Institute
2016
Texas A&M University
2016
ABSTRACT The FourStar galaxy evolution survey (ZFOURGE) is a 45 night legacy program with the near-infrared camera on Magellan and one of most sensitive surveys to date. ZFOURGE covers total 400 arcmin 2 in cosmic fields CDFS, COSMOS UDS, overlapping CANDELS. We present photometric catalogs comprising >70,000 galaxies, selected from ultradeep K s -band detection images (25.5–26.5 AB mag, 5 σ , total), >80% complete < 25.3–25.9 AB. use near-IR medium-bandwidth filters ( J 1 3 H l )...
We present the first comprehensive release of photometric redshifts (photo-z's) from Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey (CANDELS) team. use statistics based upon Quantile-Quantile (Q--Q) plot to identify biases and signatures underestimated or overestimated errors in photo-z probability density functions (PDFs) produced by six groups collaboration; correcting for these effects makes resulting PDFs better match statistical definition a PDF. After each group's PDF,...
Abstract We describe the survey design and science goals for One-hundred-deg 2 DECam Imaging in Narrowbands (ODIN), a NOIRLab using Dark Energy Camera (DECam) to obtain deep (AB ∼ 25.7) narrowband images over an unprecedented area of sky. The three custom-built filters, N 419, 501, 673, have central wavelengths 673 nm respective FWHM 7.5, 7.6, 10.0 nm, corresponding Ly α at z = 2.4, 3.1, 4.5 cosmic times 2.8, 2.1, 1.4 Gyr, respectively. When combined with even deeper, public broadband data...
Abstract The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits primary Wide-Field Camera 3 Ultraviolet and VISible light F275W imaging with coordinated parallel Advanced for Surveys F435W imaging, on four five premier extragalactic fields: GOODS-N, GOODS-S, EGS, COSMOS. We introduce this by presenting comprehensive analysis absolute...
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-...
Abstract UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W in four CANDELS fields—GOODS-N, GOODS-S, EGS, COSMOS—covering total area ∼426 arcmin 2 . This ∼2.7 times larger than the covered by previous deep-field space UV data combined, reaching depth about 27 28 ABmag (5 σ 0.”2 apertures) for F435W, respectively. Along with new photometric catalogs, we present an analysis...
Using deep multi-wavelength photometry of galaxies from ZFOURGE, we group at $2.5<z<4.0$ by the shape their spectral energy distributions (SEDs). We identify a population with excess emission in $K_s$-band, which corresponds to [OIII]+H$\beta$ $2.95<z<3.65$. This includes 78% bluest UV slopes steeper than $\beta = -2$. de-redshift and scale this build two composite SEDs, enabling us measure equivalent widths these Extreme Emission Line Galaxies (EELGs) $z\sim3.5$. 60 that comprise SED...
One of the key questions in understanding formation and evolution galaxies is how starbursts affect assembly stellar populations over time. We define a burst indicator ($\eta$), which compares galaxy's star rates on short ($\sim10$ Myr) long ($\sim100$ timescales. To estimate $\eta$, we apply detailed time-luminosity relationship for H$\alpha$ near-ultraviolet emission to simulated histories (SFHs) from semi-analytic models Mufasa hydrodynamical cosmological simulations. The average $\eta$...
Abstract The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey provided ultraviolet F275W imaging with coordinated parallel optical F435W in four five CANDELS fields: GOODS-N, GOODS-S, EGS, and COSMOS, covering a total area ∼426 arcmin 2 . UVCANDELS takes primary WFC3/UVIS exposures at uniform 3-orbit depth ACS (in parallel) slightly varying due to roll angle constraints overlap from increased field view camera, reaching...
ABSTRACT We present a model using both strong and weak gravitational lensing of the galaxy cluster MACS J0416.1-2403, constrained spectroscopy from Grism Lens-Amplified Survey Space (GLASS) Hubble Frontier Fields (HFF) imaging data. search for emission lines in known multiply imaged sources GLASS spectra, obtaining secure spectroscopic redshifts 30 multiple images belonging to 15 distinct source galaxies. The spectra provide first measurements five signal is acquired 884 galaxies F606W HFF...
We build a set of composite galaxy SEDs by de-redshifting and scaling multi-wavelength photometry from galaxies in the ZFOURGE survey, covering CDFS, COSMOS, UDS fields. From sample ~4000 K_s-band selected galaxies, we define 38 that yield continuous low-resolution spectra (R~45) over rest-frame range 0.1-4 um. Additionally, include far infrared Spitzer Space Telescope Herschel Observatory to characterize properties our diverse SEDs. these analyze UVJ colors, as well ratio IR UV light (IRX)...
Large simulation efforts are required to provide synthetic galaxy catalogs for ongoing and upcoming cosmology surveys. These extragalactic being used many diverse purposes covering a wide range of scientific topics. In order be useful, they must offer realistically complex information about the galaxies contain. Hence, it is critical implement rigorous validation procedure that ensures simulated properties faithfully capture observations delivers an assessment level realism attained by...
Abstract Lyman-alpha-emitting galaxies (LAEs) are typically young, low-mass, star-forming with little extinction from interstellar dust. Their low dust attenuation allows their Ly α emission to shine brightly in spectroscopic and photometric observations, providing an observational window into the high-redshift Universe. Narrowband surveys reveal large, uniform samples of LAEs at specific redshifts that probe large-scale structure temporal evolution galaxy properties. The One-hundred-deg 2...
Abstract The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep Hubble Space Telescope (HST) F275W and F435W over four CANDELS fields (GOODS-N, GOODS-S, COSMOS, Extended Groth Strip). We combine this newly acquired UV with existing HST from as well ancillary data to obtain robust photometric redshifts reliable estimates for galaxy physical properties 150,000 galaxies in ∼430 arcmin 2 UVCANDELS area. Here, we...
We investigate the properties of galaxies as they shut off star formation over 4 billion years surrounding peak cosmic formation. To do this we categorize $\sim7000$ from $1<z<4$ into $90$ groups based on shape their spectral energy distributions (SEDs) and build composite SEDs with $R\sim 50$ resolution. These show a variety shapes also trends in parameters such color, mass, rate, emission line equivalent width. Using widths strength 4000\AA\ break, $D(4000)$, five classes: extreme line,...
This paper presents the results of Rubin Observatory Dark Energy Science Collaboration (DESC) 3x2pt tomography challenge, which served as a first step toward optimizing tomographic binning strategy for main DESC analysis. The task choosing an optimal scheme photometric survey is made particularly delicate in context metacalibrated lensing catalogue, only photometry from bands included metacalibration process (usually riz and potentially g) can be used sample definition. goal challenge was to...
Large imaging surveys, such as the Legacy Survey of Space and Time, rely on photometric redshifts tomographic binning for 3x2pt analyses that combine galaxy clustering weak lensing. In this paper, we propose a method optimizing choice lens sample galaxies. We divide CosmoDC2 Buzzard simulated catalogs into training set an application set, where is nonrepresentative in realistic way, then estimate sets. The galaxies are sorted redshift bins covering equal intervals or comoving distance, with...
Measurements of short-timescale star formation variations (i.e., "burstiness") are integral to our understanding feedback mechanisms and the assembly stellar populations in galaxies. We expand upon work Broussard et al. (2019) by introducing a new analysis galaxy burstiness that accounts for $Q_{sg}=\mathrm{E(B-V)_{stars}}/\mathrm{E(B-V)_{gas}}$ distribution, major confounding factor. use Balmer decrements from MOSFIRE Deep Evolution Field (MOSDEF) survey measure $Q_{sg}$, which we construct...
UVCANDELS is a HST Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W in four CANDELS fields: GOODS-N, GOODS-S, EGS, COSMOS, covering total area $\sim426$ arcmin$^2$. This $\sim2.7$ times larger than the covered by previous deep-field space UV data combined, reaching depth about 27 28 ABmag ($5\sigma$ $0.2"$ apertures) for F435W, respectively. Along with new photometric catalogs, we present an analysis rest-frame...
The UltraViolet imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) program provides deep HST F275W and F435W over four CANDELS fields (GOODS-N, GOODS-S, COSMOS, EGS). We combine this newly acquired UV with existing from as well ancillary data to obtain robust photometric redshifts reliable estimates for galaxy physical properties 150,000 galaxies in $\sim$430 arcmin$^2$ UVCANDELS area. Here, we leverage power new photometry not only improve...
Abstract The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will produce several billion photometric redshifts (photo- z 's), enabling cosmological analyses to select a subset galaxies with the most accurate photo- . We perform initial redshift fits on Subaru Strategic Program deep grizy photometry using Trees for Photo-Z (TPZ) before applying custom neural network classifier (NNC) tuned ( phot − spec )/(1 + ) < 0.10. consider four cases training test sets ranging from...
Abstract Star formation histories (SFHs) reveal physical processes that influence how galaxies form their stellar mass. We compare the SFHs of a sample 36 nearby ( D ⪅ 4 Mpc) dwarf from ACS Nearby Galaxy Survey Treasury (ANGST), inferred color–magnitude diagrams (CMDs) individually resolved stars in these galaxies, with those reconstructed by broadband spectral energy distribution (SED) fitting using dense basis SED-fitting code. When comparing individual SFHs, we introduce metrics for...
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits primary Wide-Field Camera 3 Ultraviolet and Visible light F275W imaging with coordinated parallel Advanced for Surveys F435W imaging, on four five premier extragalactic fields: GOODS-N, GOODS-S, EGS, COSMOS. We introduce this by presenting thorough search galaxies at $z\gtrsim2.4$...
We describe the survey design and science goals for ODIN (One-hundred-deg^2 DECam Imaging in Narrowbands), a NOIRLab using Dark Energy Camera (DECam) to obtain deep (AB~25.7) narrow-band images over an unprecedented area of sky. The three custom-built filters, N419, N501, N673, have central wavelengths 419, 501, 673 nm respective full-widthat-half-maxima 7.2, 7.4, 9.8 nm, corresponding Lya at z=2.4, 3.1, 4.5 cosmic times 2.8, 2.1, 1.4 Gyr, respectively. When combined with even deeper, public...