A5017381535- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Pulsars and Gravitational Waves Research
- Photocathodes and Microchannel Plates
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Atmospheric Ozone and Climate
- Computational Physics and Python Applications
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Advanced Mathematical Theories and Applications
Pennsylvania State University
2015-2024
Cosmos Corporation (United States)
2022
Association of Universities For Research In Astronomy
1996-2009
U.S. National Science Foundation
1996-2009
University of Wisconsin–Madison
2008-2009
Cerro Tololo Inter-American Observatory
1996-2009
Kitt Peak National Observatory
1983-2008
National Astronomical Observatories
2008
Space Telescope Science Institute
1983-1989
Carnegie Institution for Science
1986-1988
The High-Z Supernova Search is an international collaboration to discover and monitor Type Ia supernovae (SNe Ia) at z > 0.2 with the aim of measuring cosmic deceleration global curvature. Our has pursued a basic understanding in nearby universe, discovering observing large sample objects developing methods measure accurate distances SNe Ia. This paper describes extension this program ≥ 0.2, outlining our search techniques follow-up program. We have devised high-throughput filters that...
We describe the results of an extremely deep, 0.28 deg2 survey for z = 3.1 Lyα emission-line galaxies in Extended Chandra Deep Field-South. By using a narrowband 5000 Å filter and complementary broadband photometry from MUSYC survey, we identify statistically complete sample 162 with monochromatic fluxes brighter than 1.5 × 10-17 ergs cm-2 s-1 observer's frame equivalent widths greater 80 Å. show that width distribution these objects follows exponential rest-frame scale length w0 76 In...
We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample 162 Ly Alpha-Emitting (LAE) galaxies at z=3.1 discovered in deep narrow-band MUSYC imaging Extended Chandra Deep Field South. LAEs were selected to have observed frame equivalent widths >80A emission line fluxes >1.5E-17 erg/cm^2/s. Only 1% our LAE appears host AGN. The exhibit moderate spatial correlation length r_0=3.6+0.8-1.0 Mpc, corresponding bias factor b=1.7+0.3-0.4, which...
view Abstract Citations (306) References (62) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Planetary Nebulae as Standard Candles. II. The Calibration in M31 and Its Companions Ciardullo, Robin ; Jacoby, George H. Ford, Holland C. Neill, James D. We present the results of a planetary nebula survey M31's bulge performed with Kitt Peak No. 1 0.9 m telescope on-band off-band λ5007 filters. detected total 429 nebulae (PNs), which 104 are members statistically...
We report the results of [O III] λ5007 surveys for planetary nebulae (PNe) in six galaxies: NGC 2403, 3115, 3351, 3627, 4258, and 5866. Using on-band/off-band images, as well images taken Hα, we identify samples PNe these galaxies derive their distances using nebula luminosity function (PNLF). then combine measurements with previous data to compare PNLF, Cepheid, surface brightness fluctuation (SBF) distance scales. use a sample 13 show that absolute magnitude PNLF cutoff is fainter small,...
We report the results of an [O III] lambda 5007 survey for planetary nebulae (PN) in three spiral galaxies: M101 (NGC 5457), M51 5194/5195) and M96 3368). By comparing on-band/off-band images with taken H-alpha broadband R, we identify 65, 64 74 PN candidates each galaxy, respectively. From these data, adopted M31 distance 770 kpc, empirical nebula luminosity function (PNLF), derive distances to M101, M51, 7.7 +/- 0.5, 8.4 0.6, 9.6 0.6 Mpc. These observations demonstrate that PNLF technique...
We selected 40 candidate Lyman Alpha Emitting galaxies (LAEs) at z ~=3.1 with observed frame equivalent widths >150A and inferred emission line fluxes >2.5x10^-17 ergs/cm^2/s from deep narrow-band broad-band MUSYC images of the Extended Chandra Deep Field South. Covering 992 sq. arcmin, this is largest ``blank field'' surveyed for LAEs ~3, allowing an improved estimate space density population 3+-1x10^-4 h_70^3/Mpc^3. Spectroscopic follow-up 23 candidates yielded 18 redshifts, all ~=3.1....
view Abstract Citations (260) References (73) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Planetary Nebulae as Standard Candles. V. The Distance to the Virgo Cluster Jacoby, George H. ; Ciardullo, Robin Ford, Holland C. We identify and measure [O III] λ5007 fluxes of 486 planetary nebula candidates in six early-type galaxies (NGC 4374, 4382, 4406, 4472, 4486, 4649) core Cluster. Following procedures calibrations outlined previous papers this series, we...
We discovered a sample of 250 Lyα emitting (LAE) galaxies at z ≃ 2.1 in an ultra-deep 3727 Å narrow-band MUSYC image the Extended Chandra Deep Field-South. The LAEs were selected to have rest-frame equivalent widths (EWs) >20 and emission-line fluxes FLyα>2.0 × 10−17 erg cm−2 s−1, after carefully subtracting continuum contributions from photometry. median flux our is FLyα = 4.2 corresponding luminosity LLyα 1.3 1042 s−1 2.1. At this flux, ⩾90% complete. Approximately 4% original NB-selected...
We study the escape of Ly-alpha photons from emitting galaxies (LAEs) and overall galaxy population using a sample 99 LAEs at 1.9<z<3.8 detected through integral-field spectroscopy blank fields by HETDEX Pilot Survey. For 89 showing counterparts in deep broad-band images we measure rest-frame UV luminosity slope, which use to estimate E(B-V) under assumption constant intrinsic slope for LAEs. These two quantities are used dust-corrected star formation rate (SFR). A comparison between...
We present a catalog of emission-line galaxies selected solely by their fluxes using wide-field integral field spectrograph. This work is partially motivated as pilot survey for the upcoming Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). describe observations, reductions, detections, redshift classifications, line fluxes, and counterpart information 397 detected over 169 sq.arcmin with 3500-5800 Ang. bandpass under 5 full-width-half-maximum (FWHM) spectral resolution. The survey's...
We use 317,000 emission-line galaxies from the Sloan Digital Sky Survey to investigate line-ratio selection of active galactic nuclei (AGNs). In particular, we demonstrate that "star formation (SF) dilution" by H ii regions causes a significant bias against AGN in low-mass, blue, star-forming, disk-dominated galaxies. This is responsible for observed preference AGNs among high-mass, green, moderately bulge-dominated hosts. account and simulate intrinsic population using physically motivated...
We describe the survey design, calibration, commissioning, and emission-line detection algorithms for Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure redshifts over a million Ly$\alpha$ emitting galaxies between 1.88<z<3.52, in 540 deg^2 area encompassing co-moving volume 10.9 Gpc^3. No pre-selection targets involved; instead measurements are accomplished via spectroscopic using suite wide-field integral field units distributed focal plane telescope....
Abstract We present the first publicly released catalog of sources obtained from Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure Hubble expansion parameter and angular diameter distance at 1.88 < z 3.52 by using spatial distribution more than a million Ly α -emitting galaxies over total target area 540 deg 2 . The comes contiguous fiber spectra coverage 25 sky 2017 January through 2020 June, where object...
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...
We report the results of a Hubble Space Telescope "snapshot" survey aimed at finding resolved binary companions central stars Galactic planetary nebulae (PNe). Using Wide Field and Planetary Camera 2, we searched fields 113 PNe for whose close proximity to star suggests physical association. In all, find 10 nuclei that are very likely be physically associated another six possible associations. By correcting interstellar extinction placing stars' on main sequence (or, in one case, white dwarf...
Narrowband imaging surveys aimed at detecting the faint emission from 5007 Å [O III] line of intracluster planetary nebulae in Virgo also probe high-redshift z ~ 3.1 Lyα emitters. Here we report on spectroscopic identification nine emitters = 3.13 with fluxes between 2 × 10-17 and 10-16 ergs cm-2 s-1 obtained FORS spectrograph Unit 1 ESO Very Large Telescope (VLT UT1). The spectra these objects show a narrow, isolated very (frequently undetected) continuum, indicating large equivalent width....
We have measured the velocities of 19 planetary nebulae (PNs) in outer regions giant early-type galaxy NGC 4406 Virgo cluster. The kinematics outermost regions, at a mean radius 142" or 11 kpc, show rapid rotation and low observed velocity dispersion (∼ 166 96 km s−1, respectively) , compared with central about 210 s−1. This supports classification this as an S0. Although has systemic -227 we found three PNs close to cluster (about 1400 s−1). argue that these may be members intracluster...
view Abstract Citations (165) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Planetary Nebula System and Dynamics of NGC 5128. I. Nebulae as Standard Candles Hui, Xiaohui ; Ford, Holland C. Ciardullo, Robin Jacoby, George H. We present the result a planetary nebula (PN) survey nearby giant elliptical galaxy 5128 performed with CCD cameras at prime focus CTIO 4 m telescope. By comparing images centered on characteristic emission line [O...
We present the results of Keck/NIRSPEC spectroscopic observations three Lyα emitting galaxies (LAEs) at z∼ 2.3 discovered with HETDEX pilot survey. detect Hα, [O iii], and Hβ emission from two z= 2.29 2.49, designated HPS194 HPS256, respectively, representing first detection multiple rest-frame optical lines in high redshift selected on basis their emission. find that redshifts these are offset redward systemic (derived Hα iii] emission) by Δv = 162 ± 37 (photometric) 42 (systematic) km s−1...
We describe the results of a new, wide-field survey for z=3.1 Ly-alpha emission-line galaxies (LAEs) in Extended Chandra Deep Field South (ECDF-S). By using nearly top-hat 5010 Angstrom filter and complementary broadband photometry from MUSYC survey, we identify complete sample 141 objects with monochromatic fluxes brighter than 2.4E-17 ergs/cm^2/s observers-frame equivalent widths greater ~ 80 Angstroms (i.e., 20 rest-frame Ly-alpha). The bright-end this dataset is dominated by x-ray...
As the first step to determine disk mass-to-light ratios for normal spiral galaxies, we present results of an imaging survey planetary nebulae (PNe) in six nearby, face-on systems: IC 342, M74 (NGC 628), M83 5236), M94 4736), NGC 5068, and 6946. Using Blanco/Mosaic II WIYN/OPTIC, identify 165, 153, 241, 150, 19, 71 PN candidates, respectively, use nebula luminosity function (PNLF) obtain distances. For our distances 8.6 ± 0.3 5.4+0.2−0.4 Mpc are reliable estimates these objects; 342 (3.5...
We study the physical properties of 216 z ≃ 2.1 Lyα-emitting galaxies (LAEs) discovered in an ultra-deep narrow- MUSYC image ECDF-S. fit their stacked spectral energy distribution (SED) using Charlot & Bruzual templates. consider star formation histories (SFHs) parameterized by e-folding time parameter τ, allowing for exponentially decreasing (τ > 0), increasing < and constant rates (SFRs). estimated average flux at 5015 Å our LAE sample, finding a non-detection, which translates into...