A5026905121- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Dental Research and COVID-19
- Innovative Teaching Methods
- Astrophysical Phenomena and Observations
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Medical and Agricultural Research Studies
- Geophysics and Gravity Measurements
- CCD and CMOS Imaging Sensors
Chandler–Gilbert Community College
2018-2024
Arizona State University
2018-2021
While most of the inter-galactic medium (IGM) today is permeated by ionized hydrogen, it was largely filled with neutral hydrogen for first 700 million years after Big Bang. The process that IGM (cosmic reionization) expected to be spatially inhomogeneous, fainter galaxies playing a significant role. However, we still have only few direct constraints on reionization process. Here report spectroscopic confirmation two and very likely third galaxy in group (hereafter EGS77) at redshift z =...
We present the largest-ever sample of 79 Ly$α$ emitters (LAEs) at $z\sim$ 7.0 selected in COSMOS and CDFS fields LAGER project (the Lyman Alpha Galaxies Epoch Reionization). Our newly amassed ultradeep narrowband exposure deeper/wider broadband images have more than doubled number LAEs COSMOS, we 30 second field CDFS. detect two large-scale LAE-overdense regions that are likely protoclusters highest redshift to date. perform injection recovery simulations derive incompleteness. show...
We present our measurements of the H$\alpha$, [OIII], and [OII] luminosity functions as part Lyman Alpha Galaxies at Epoch Reionization (LAGER) survey using samples 1577 $z = 0.47$ H$\alpha$-, 3933 0.93$ [OIII]-, 5367 1.59$ [OII]-selected emission line galaxies in a single 3 deg$^2$ CTIO/Blanco DECam pointing COSMOS field. Our observations reach 5$\sigma$ depths $8.2\times10^{-18}$ erg s$^{-1}$ cm$^{-2}$ comoving volumes $(1-7)\times10^{5}$ Mpc$^3$ making one deepest narrowband surveys....
Abstract We present new measurements of the H α luminosity function (LF) and star formation rate (SFR) volume density for galaxies at z ∼ 0.62 in COSMOS field. Our results are part Deep And Wide Narrow-band Survey (DAWN), a unique infrared imaging program with large areal coverage (∼1.1 deg 2 over five fields) sensitivity ( <?CDATA $9.9\times {10}^{-18}\,\mathrm{erg}\,{\mathrm{cm}}^{-2}\,{{\rm{s}}}^{-1}$?> 5 σ ). The sample, based on single DAWN field, contains 116 emission-line candidates...
ABSTRACT The H α equivalent width (EW) is an observational proxy for specific star formation rate (sSFR) and a tracer of episodic, bursty star-formation activity. Previous assessments show that the EW strongly anticorrelates with stellar mass as M−0.25 similar to sSFR – relation. However, such correlation could be driven or even formed by selection effects. In this study, we investigate how distributions correlate physical properties galaxies biases alter correlations using z = 0.47...
We present the design for first narrowband filter, NB964, Dark Energy Camera (DECam), which is operated on 4-m Blanco Telescope at Cerro Tololo Inter-American Observatory. The NB964 filter profile essentially defined by maximizing power of searching Lyman-alpha emitting galaxies (LAEs) in epoch reionization, with consideration night sky background near-infrared and DECam quantum efficiency. was manufactured Materion 2015. It has a central wavelength 964.2 nm full width half maximum (FWHM)...
We present new estimates of the luminosity function (LF) and star formation rate density (SFRD) for an Hα-selected sample at z ∼ 0.62 from Deep And Wide Narrow-band (DAWN) survey. Our results are based on a Hα in extended COSMOS region (compared to Coughlin et al.) with inclusion flanking fields, resulting total area coverage ∼1.5 deg2. A 241 emitters were selected robust selection criteria using spectrophotometric redshifts broadband color–color classification. Given that dust extinction is...
ABSTRACT Past studies have investigated the evolution in specific star formation rate (sSFR) and its observational proxy (H $\alpha$ equivalent width; EW) up to $z \sim 6$; however, such measurements may overestimate typical sSFR/EW at a given redshift due selection effects. We investigate ‘intrinsic’ (selection effects corrected) H EW distributions of 0.4 - 2.2$ narrowband-selected samples from High-z Emission Line Survey (HiZELS) Deep Wide Narrowband survey (DAWN) using forward modelling...
We investigate the `intrinsic' H$\alpha$ EW distributions of $z \sim 0.4 - 2.2$ narrowband-selected samples from HiZELS and DAWN using a forward modeling approach. find an stellar mass anti-correlation with steepening slopes $-0.18\pm0.03$ to $-0.24^{+0.06}_{-0.08}$ at 0.4$ $z\sim 2.2$, respectively. Typical increases as $(1+z)^{1.78^{+0.22}_{-0.23}}$ for $10^{10}$ M$_\odot$ emitter $15^{+2.4}_{-2.3}$\r{A} ($z 0.4$) $67.7^{+10.4}_{-10.0}$\r{A} 2.2$) is steeper decreasing highlighting high...