A5084185055- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Photocathodes and Microchannel Plates
- Insurance, Mortality, Demography, Risk Management
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Advanced Optical Sensing Technologies
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Calibration and Measurement Techniques
- Statistical Methods and Bayesian Inference
- Spectroscopy and Chemometric Analyses
- Statistical Methods and Inference
- Impact of Light on Environment and Health
- Anomaly Detection Techniques and Applications
- Gaussian Processes and Bayesian Inference
- Dark Matter and Cosmic Phenomena
- demographic modeling and climate adaptation
University of California, Riverside
2014-2023
Louisiana State University
2008-2011
In this paper we present the MOSFIRE Deep Evolution Field (MOSDEF) survey. The MOSDEF survey aims to obtain moderate-resolution (R=3000-3650) rest-frame optical spectra (~3700-7000 Angstrom) for ~1500 galaxies at 1.37<z<3.80 in three well-studied CANDELS fields: AEGIS, COSMOS, and GOODS-N. Targets are selected redshift intervals: 1.37<z<1.70, 2.09<z<2.61, 2.95<z<3.80, down fixed H_AB (F160W) magnitudes of 24.0, 24.5 25.0, respectively, using photometric spectroscopic catalogs from 3D-HST We...
We present results on the dust attenuation curve of z ∼ 2 galaxies using early observations from MOSFIRE Deep Evolution Field survey. Our sample consists 224 star-forming with zspec = 1.36–2.59 and high signal-to-noise ratio measurements Hα Hβ obtained Keck/MOSFIRE. construct composite spectral energy distributions (SEDs) in bins Balmer decrement to measure curve. find a that is similar SMC extinction at λ ≳ 2500 Å. At shorter wavelengths, shape identical Calzetti et al. relation, but lower...
Using observations from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we investigate physical conditions of star-forming regions in $z\sim2.3$ galaxies, specifically electron density and ionization state. From measurements [O II]$\lambda\lambda$3726,3729 [S II]$\lambda\lambda$6716,6731 doublets, find a median $\sim250$ cm$^{-3}$ at $z\sim2.3$, an increase order magnitude compared to galaxies $z\sim0$. While are offset towards significantly higher O$_{32}$ values relative local fixed...
We present results on the excitation properties of z ∼ 2.3 galaxies using early observations from MOSFIRE Deep Evolution Field (MOSDEF) Survey. With its coverage full suite strong rest-frame optical emission lines, MOSDEF provides an unprecedented view spectra a representative sample distant star-forming galaxies. investigate locations in multiple emission-line diagnostic diagrams. These include [O iii]λ5007/Hβ vs. [N ii]/Hα and [S ii]λλ6717, 6731/Hα "BPT" diagrams, as well O32 R23 diagram....
We present deep spectroscopy of 17 very low mass (M⋆ ≃ 2.0 × 106–1.4 109 M⊙) and luminosity (MUV −13.7 to −19.9) gravitationally lensed galaxies in the redshift range z 1.5-3.0. Deep rest-frame ultraviolet spectra reveal large equivalent width emission from numerous lines (N iv], O iii], C iv, Si iii]) which are rarely seen individual more massive star-forming galaxies. iii] is detected 16 low-mass systems with widths as 13.5 Å. Nebular iv most extreme emitters, requiring an ionizing source...
We present detections of [OIII]$\lambda$4363 and direct-method metallicities for star-forming galaxies at $z=1.7-3.6$. combine new measurements from the MOSFIRE Deep Evolution Field (MOSDEF) survey with literature sources to construct a sample 18 $z>1$, spanning $7.5<1$2+log(O/H$)<8.2$ log(M$_*$/M$_{\odot})=7-10$. find that strong-line calibrations based on local analogs high-redshift reliably reproduce metallicity $z>1$ average. first mass-metallicity relation purely O/H, finding slope is...
We present results on the z~2.3 mass-metallicity relation (MZR) using early observations from MOSFIRE Deep Evolution Field (MOSDEF) survey. use an initial sample of 87 star-forming galaxies with spectroscopic coverage H\beta, [OIII]\lambda 5007, H\alpha, and [NII]\lambda 6584 rest-frame optical emission lines, estimate gas-phase oxygen abundance based N2 O3N2 strong-line indicators. find a positive correlation between stellar mass metallicity among individual both also measure emission-line...
We have obtained deep ultraviolet imaging of the lensing cluster A1689 with WFC3/UVIS camera onboard Hubble Space Telescope in F275W (30 orbits) and F336W (4 filters. These images are used to identify z ∼ 2 star-forming galaxies via their Lyman break, same manner that typically selected at ⩾ 3. Because unprecedented depth large magnification provided by cluster, we detect 100× fainter than previous surveys this redshift. After removing all multiple images, 58 our sample range −19.5 < M1500...
Abstract We investigate the nature of relation among stellar mass, star formation rate, and gas-phase metallicity (the <?CDATA ${M}_{* }$?> –SFR– Z relation) at high redshifts using a sample 260 star-forming galaxies z ∼ 2.3 from MOSDEF survey. present an analysis high-redshift based on several emission-line ratios for first time. show that clearly exists 2.3. The strength this is similar to predictions cosmological hydrodynamical simulations. By performing direct comparison stacks 0...
Abstract We derive a UV-optical stellar dust attenuation curve of galaxies at z = 1.4–2.6 as function gas-phase metallicity. use sample 218 star-forming galaxies, excluding those with very young or heavily obscured star formation, from the MOSFIRE Deep Evolution Field survey H α , β and [N ii ] λ 6585 spectroscopic measurements. constrain shape by comparing average flux densities sorted into bins obscuration using Balmer decrements, i.e., -to-H luminosities. The for high-metallicity (...
ABSTRACT We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on identification, selection biases, and host galaxy properties of 55 X-ray, IR, optically selected active galactic nuclei (AGNs) at <?CDATA $1.4\lt z\lt 3.8$?> . obtain rest-frame optical spectra galaxies AGNs use BPT diagram to identify AGNs. examine uniqueness overlap identified different wavelengths. There is a strong bias against identifying any wavelength in low-mass galaxies, an additional IR most...
ABSTRACT We present a robust measurement of the rest-frame UV luminosity function (LF) and its evolution during peak epoch cosmic star formation at <?CDATA $1\lt z\lt 3$?> . use our deep near-ultraviolet imaging from WFC3/UVIS on Hubble Space Telescope existing Advanced Camera for Surveys (ACS)/WFC WFC3/IR three lensing galaxy clusters, Abell 2744 MACS J0717 Frontier Field survey 1689. Combining high magnification strong gravitational lensing, we photometric redshifts to identify 780...
ABSTRACT We present <?CDATA ${\rm{H}}\alpha $?> <?MML <mml:math> <mml:mi mathvariant="normal">H</mml:mi> <mml:mi>&agr;</mml:mi> </mml:math>?> gas kinematics for 178 star-forming galaxies at $z\sim 2$?> <mml:mi>z</mml:mi> <mml:mo>∼</mml:mo> <mml:mn>2</mml:mn> from the MOSFIRE Deep Evolution Field survey. have developed models to interpret kinematic measurements fixed-angle multi-object spectroscopy, using structural parameters derived Cosmic Assembly Near-Infrared Extragalactic Legacy...
We present results on the star formation rate (SFR) versus stellar mass (M*) relation (i.e., "main sequence") among star-forming galaxies at 1.37 ≤ z 2.61 using MOSFIRE Deep Evolution Field (MOSDEF) survey. Based a sample of 261 with Hα and Hβ spectroscopy, we have estimated robust dust-corrected instantaneous SFRs over large range in M* (∼109.5–1011.5 M⊙). find correlation between log(SFR(Hα)) log(M*) slope 0.65 ± 0.08 (0.58 0.10) 1.4 < 2.6 (2.1 2.6). that different assumptions for dust...
Using data from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we present a census of AGN-driven ionized outflows in sample 159 AGNs at $1.4 \le z 3.8$. The spans AGN bolometric luminosities $10^{44-47} \mathrm{~erg~s}^{-1}$ and includes both quiescent star-forming galaxies extending across three orders magnitude stellar mass. We identify characterize \hbeta, [OIII], \halpha ~and [NII] emission line spectra. detect $17\%$ AGNs, seven times more often than mass-matched inactive MOSDEF. are...
We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on rest-frame optical AGN identification and completeness at z~2.3. With our sample of 50 galaxies 10 X-ray IR-selected with measured H-beta, [OIII], H-alpha, [NII] emission lines, we investigate location in BPT, MEx (mass-excitation), CEx (color-excitation) diagrams. find that BPT diagram works well to identify z~2.3 z~0 AGN/star-forming galaxy classifications do not need shift substantially robustly separate these...
We combine spectroscopic measurements of H$\alpha$ and H$\beta$ UV continuum photometry for a sample 673 galaxies from the MOSFIRE Deep Evolution Field survey to constrain hydrogen ionizing photon production efficiencies ($\xi_{\rm ion}$, xi_ion) at z=1.4-2.6. find average log(xi_ion/[Hz erg$^{-1}$])=25.06 (25.34), assuming Calzetti (SMC) curve dust correction scatter 0.28 dex in xi_ion distribution. After accounting observational uncertainties variations attenuation, we conclude that...
Abstract We present results on the emission-line properties of 1.3 ≤ z 2.7 galaxies drawn from complete MOSFIRE Deep Evolution Field (MOSDEF) survey. Specifically, we use observations diagnostic diagram [O iii ] λ 5007/H β versus [S ii λλ 6717,6731/H α , i.e., “[S BPT diagram,” to gain insight into physical high-redshift star-forming regions. High-redshift MOSDEF are offset toward lower at fixed relative local Sloan Digital Sky Survey (SDSS). Furthermore, SDSS follow a trend decreasing as...
Abstract We present results from the MOSFIRE Deep Evolution Field survey on broad flux nebular emission lines H α , [N ii ], [O iii β and [S ]. The sample consists of 127 star-forming galaxies at 1.37 < z 2.61 84 2.95 3.80. decompose using narrow Gaussian components that we define as having FWHM 275 km s −1 > 300 respectively, for both individual stacks. For galaxies, is detected >3 σ in <10% accounts 10%–70% total flux. In stacks, find a slight increase to ratio with mass but...
We analyze the rest-optical emission-line spectra of $z\sim2.3$ star-forming galaxies in complete MOSFIRE Deep Evolution Field (MOSDEF) survey. In investigating origin well-known offset between sequences high-redshift and local [O III]5008/H$\beta$ vs. [N II]6585/H$\alpha$ ("[N II] BPT") diagram, we define two populations MOSDEF galaxies. These include "high" population that is towards higher and/or with respect to SDSS sequence "low" overlaps sequence. groups are also segregated within [S...
Abstract Using observations from the first 2 yr of MOSFIRE Deep Evolution Field (MOSDEF) survey, we study 13 active galactic nucleus (AGN) driven outflows detected a sample 67 X-ray, IR, and/or optically selected AGNs at <?CDATA $z\sim 2$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi> <mml:mo>∼</mml:mo> <mml:mn>2</mml:mn> </mml:math> . The have bolometric luminosities $\sim {10}^{44}\mbox{--}{10}^{46}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$?>...
We measure the ionizing photon production efficiency ($\xi_{ion}$) of low-mass galaxies ($10^{7.8}$-$10^{9.8}$ $M_{\odot}$) at $1.4<z<2.7$, allowing us to better understand contribution dwarf background and cosmic reionization. target that are magnified by strong lensing galaxy clusters Abell 1689, MACS J0717, J1149. utilize Keck/MOSFIRE spectra optical nebular emission line fluxes HST imaging rest-UV rest-optical photometry. present two methods stacking. First, we take average...
Abstract We investigate the evolution of galaxy gas-phase metallicity (O/H) over range z = 0–3.3 using samples ∼300 galaxies at ∼ 2.3 and ∼150 3.3 from MOSDEF survey. This analysis crucially utilizes different calibrations 0 > 1 to account for evolving interstellar medium (ISM) conditions. find significant correlations between O/H stellar mass ( M * ) 3.3. The low-mass power-law slope mass–metallicity relation (MZR) is remarkably invariant 0–3.3, such that ∝ <?CDATA ${M}_{* }^{0.30}$?>...
We present the first direct comparison between Balmer line and panchromatic SED-based SFRs for z~2 galaxies. For this we used 17 star-forming galaxies selected from MOSFIRE Deep Evolution Field (MOSDEF) survey, with $3\sigma$ detections H$\alpha$ at least two IR bands (Spitzer/MIPS 24$\mu$m Herschel/PACS 100 160$\mu$m, in some cases Herschel/SPIRE 250, 350, 500$\mu$m). The have total (8-1000$\mu$m) luminosities of $\sim10^{11.4}-10^{12.4}\,\textrm{L}_\odot$ star-formation rates (SFRs)...
We present measurements of the electron-temperature based oxygen abundance for a highly star-forming galaxy at z=3.08, COSMOS-1908. This is highest redshift which [OIII]$\lambda$4363 has been detected, and first time that this line measured z>2. estimate an 12+log(O/H)$=8.00^{+0.13}_{-0.14}$. low-mass ($10^{9.3}$ M$_{\odot}$), ($\sim50$ M$_{\odot}$ yr$^{-1}$) system hosts young stellar population ($\sim160$ Myr). investigate physical conditions ionized gas in COSMOS-1908 find high ionization...