Asantha Cooray
YOU?
Author Swipe
View article: The SPHEREx Sky Simulator: Science Data Modeling for the First All-sky Near-infrared Spectral Survey
The SPHEREx Sky Simulator: Science Data Modeling for the First All-sky Near-infrared Spectral Survey Open
We describe the SPHEREx Sky Simulator (henceforth the Simulator), a software tool designed to model science data for NASA’s SPHEREx mission that will carry out a series of all-sky spectrophotometric surveys at ∼6″ spatial resolution in 102…
View article: The Cosmic Infrared Background Experiment-2: An Intensity-mapping Optimized Sounding-rocket Payload to Understand the Near-IR Extragalactic Background Light
The Cosmic Infrared Background Experiment-2: An Intensity-mapping Optimized Sounding-rocket Payload to Understand the Near-IR Extragalactic Background Light Open
The background light produced by emission from all sources over cosmic history is a powerful diagnostic of structure formation and evolution. At near-infrared wavelengths, this extragalactic background light (EBL) is comprised of emission …
View article: The Potential of the SPHEREx Mission for Characterizing Polycyclic Aromatic Hydrocarbon 3.3 <i>μ</i>m Emission in Nearby Galaxies
The Potential of the SPHEREx Mission for Characterizing Polycyclic Aromatic Hydrocarbon 3.3 <i>μ</i>m Emission in Nearby Galaxies Open
Together with gas, stars, and supermassive black holes, dust is crucial in stellar and galaxy evolution. Hence, understanding galaxies’ dust properties across cosmic time is critical to studying their evolution. In addition to photometric …
View article: CIBER Fourth Flight Fluctuation Analysis: Pseudopower Spectrum Formalism, Improved Source Masking, and Validation on Mocks
CIBER Fourth Flight Fluctuation Analysis: Pseudopower Spectrum Formalism, Improved Source Masking, and Validation on Mocks Open
Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broadband intensity mapping measurements. In this paper, we detail improvements in methodology fo…
View article: HerS-3: An Exceptional Einstein Cross Reveals a Massive Dark Matter Halo
HerS-3: An Exceptional Einstein Cross Reveals a Massive Dark Matter Halo Open
We present a study of HerS-3, a dusty star-forming galaxy at z spec = 3.0607, which is gravitationally amplified into an Einstein cross with a fifth image of the background galaxy seen at the center of the cross. Detailed 1 mm spectroscopy…
View article: The SPHEREx Sky Simulator: Science Data Modeling for the First All-Sky Near-Infrared Spectral Survey
The SPHEREx Sky Simulator: Science Data Modeling for the First All-Sky Near-Infrared Spectral Survey Open
We describe the SPHEREx Sky Simulator, a software tool designed to model science data for NASA's SPHEREx mission that will carry out a series of all-sky spectrophotometric surveys at $\sim$6'' spatial resolution in 102 spectral channels sp…
View article: <i>Euclid</i>: A complete Einstein ring in NGC 6505
<i>Euclid</i>: A complete Einstein ring in NGC 6505 Open
We report the discovery of a complete Einstein ring around the elliptical galaxy NGC 6505, at z = 0.042. This is the first strong gravitational lens discovered in Euclid and the first in an NGC object from any survey. The combination of th…
View article: CIBER 4th flight fluctuation analysis: Measurements of near-IR auto- and cross-power spectra on arcminute to sub-degree scales
CIBER 4th flight fluctuation analysis: Measurements of near-IR auto- and cross-power spectra on arcminute to sub-degree scales Open
We present new anisotropy measurements in the near-infrared (NIR) for angular multipoles $300<\ell<10^5$ using imaging data at 1.1 $μ$m and 1.8 $μ$m from the fourth flight of the Cosmic Infrared Background ExpeRiment (CIBER). Using improve…
View article: CIBER 4th flight fluctuation analysis: Pseudo-power spectrum formalism, improved source masking and validation on mocks
CIBER 4th flight fluctuation analysis: Pseudo-power spectrum formalism, improved source masking and validation on mocks Open
Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broad-band intensity mapping measurements. In this paper we detail improvements in methodology fo…
View article: The Relational Dynamics of Space-Time
The Relational Dynamics of Space-Time Open
The Relational Dynamics of Space-Time is a groundbreaking theory that redefines space-time as an emergent and discrete structure, arising from fundamental interactions between elementary entities. Rooted in the principle that “nothing is e…
View article: A novel high-<i>z</i> submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot
A novel high-<i>z</i> submm galaxy efficient line survey in ALMA Bands 3 through 8 – an ANGELS pilot Open
We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.5–0.1 arcsec) for 16 bright southern Herschel sources at $1.5 \lt z \lt 4.2$. With only six …
View article: Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS
Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS Open
Substantial populations of massive quiescent galaxies at z ≥ 3 challenge our understanding of rapid galaxy growth and quenching over short timescales. In order to piece together this evolutionary puzzle, more statistical samples of these o…
View article: A dusty proto-cluster surrounding the binary galaxy HerBS-70 at $z = 2.3$
A dusty proto-cluster surrounding the binary galaxy HerBS-70 at $z = 2.3$ Open
We report on deep SCUBA-2 observations at 850$μ$m and NOEMA spectroscopic measurements at 2 mm of the environment surrounding the luminous, massive ($M_{*} \approx 2 \times 10^{11}$ M$_{\odot}$) Herschel-selected source HerBS-70. This sour…
View article: A dusty protocluster surrounding the binary galaxy HerBS-70 at <i>z</i> = 2.3
A dusty protocluster surrounding the binary galaxy HerBS-70 at <i>z</i> = 2.3 Open
We report on deep SCUBA-2 observations at 850 $\mu$m and NOrthern Extended Millimetre Array (NOEMA) spectroscopic measurements at 2 mm of the environment surrounding the luminous, massive (M* ≈ 2 × 1011 M⊙) Herschel-selected source HerBS-7…
View article: Constraints on the SZ power spectrum on degree angular scales in WMAP data
Constraints on the SZ power spectrum on degree angular scales in WMAP data Open
The Sunyaev-Zel'dovich (SZ) effect has a distinct spectral signature that allows its separation from fluctuations in the cosmic microwave background (CMB) and foregrounds. Using CMB anisotropies measured in Wilkinson Microwave Anisotropy P…
View article: z-GAL: A NOEMA spectroscopic redshift survey of bright <i>Herschel</i> galaxies
z-GAL: A NOEMA spectroscopic redshift survey of bright <i>Herschel</i> galaxies Open
Galaxies
View article: MULTI-WAVELENGTH LENS RECONSTRUCTION of A PLANCK and HERSCHEL-DETECTED STAR-BURSTING GALAXY
MULTI-WAVELENGTH LENS RECONSTRUCTION of A PLANCK and HERSCHEL-DETECTED STAR-BURSTING GALAXY Open
We present a source-plane reconstruction of a Herschel and Planck-detected gravitationally lensed dusty star-forming galaxy (DSFG) at z = 1.68 using Hubble, Submillimeter Array (SMA), and Keck observations. The background submillimeter gal…
View article: Characterization of <i>Herschel</i>-selected strong lens candidates through <i>HST</i> and sub-mm/mm observations
Characterization of <i>Herschel</i>-selected strong lens candidates through <i>HST</i> and sub-mm/mm observations Open
We have carried out Hubble Space Telescope (HST) snapshot observations at 1.1 μm of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel Space Observatory. Our candidates comp…
View article: Characterisation of Herschel-selected strong lens candidates through HST and sub-mm/mm observations
Characterisation of Herschel-selected strong lens candidates through HST and sub-mm/mm observations Open
We have carried out HST snapshot observations at 1.1 $μ$m of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel space observatory. Our candidates comprise systems with flux …
View article: Missing Giants: Predictions on Dust-obscured Galaxy Stellar Mass Assembly Throughout Cosmic Time
Missing Giants: Predictions on Dust-obscured Galaxy Stellar Mass Assembly Throughout Cosmic Time Open
Due to their extremely dust-obscured nature, much uncertainty still exists surrounding the stellar mass growth and content in dusty, star-forming galaxies (DSFGs) at z > 1. In this work, we present a numerical model built using empirical d…
View article: z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [I] Overview
z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [I] Overview Open
(Abridged) Using the IRAM NOEMA interferometer, we measures the redshifts of 126 bright galaxies detected in the Herschel H-ATLAS, HeLMS, and HerS surveys. We report reliable spectroscopic redshifts for a total of 124 of the Herschel-selec…
View article: z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [III] Physical properties
z-GAL -- A NOEMA spectroscopic redshift survey of bright Herschel galaxies: [III] Physical properties Open
The z-GAL survey observed 137 bright Herschel-selected targets with the IRAM NOrthern Extended Millimeter Array, with the aim to measure their redshift and study their properties. Several of them have been resolved into multiple sources. C…
View article: <i>z</i>-GAL: A NOEMA spectroscopic redshift survey of bright <i>Herschel</i> galaxies
<i>z</i>-GAL: A NOEMA spectroscopic redshift survey of bright <i>Herschel</i> galaxies Open
The z -GAL survey observed 137 bright Herschel -selected targets with the IRAM Northern Extended Millimeter Array, with the aim to measure their redshift and study their properties. Several of them have been resolved into multiple sources.…
View article: <i>z</i>-GAL: A NOEMA spectroscopic redshift survey of bright<i>Herschel</i>galaxies
<i>z</i>-GAL: A NOEMA spectroscopic redshift survey of bright<i>Herschel</i>galaxies Open
Using the IRAM NOrthern Extended Millimetre Array (NOEMA), we conducted a Large Programme ( z -GAL) to measure redshifts for 126 bright galaxies detected in the Herschel Astrophysical Large Area Survey (H-ATLAS), the HerMES Large Mode Surv…
View article: Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS
Efficient NIRCam Selection of Quiescent Galaxies at 3 < z < 6 in CEERS Open
Substantial populations of massive quiescent galaxies at $z\ge3$ challenge our understanding of rapid galaxy growth and quenching over short timescales. In order to piece together this evolutionary puzzle, more statistical samples of these…
View article: Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71<i>Herschel</i>targets
Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71<i>Herschel</i>targets Open
We analyse the molecular and atomic emission lines of 71 bright Herschel-selected galaxies between redshifts 1.4 and 4.6 detected by the Atacama Large Millimeter/submillimeter Array. These lines include a total of 156 CO, [C i], and H2O em…
View article: The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations
The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations Open
We present rest-frame optical emission-line flux ratio measurements for five z > 5 galaxies observed by the James Webb Space Telescope Near-Infared Spectrograph (NIRSpec) in the SMACS 0723 Early Release Observations. We add several quality…
View article: CEERS Key Paper. IV. A Triality in the Nature of HST-dark Galaxies
CEERS Key Paper. IV. A Triality in the Nature of HST-dark Galaxies Open
The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate in unprecedented detail the nature of optical/near-IR-faint, mid-IR-bright sources, with HST-dark galaxies among them. We gather JWST data fro…
View article: A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 au New Horizons-LORRI Data
A Measurement of the Cosmic Optical Background and Diffuse Galactic Light Scaling from the R < 50 au New Horizons-LORRI Data Open
Direct photometric measurements of the cosmic optical background (COB) provide an important point of comparison to both other measurement methodologies and models of cosmic structure formation, and permit a cosmic consistency test with the…
View article: Resolved CO(1–0) Emission and Gas Properties in Luminous Dusty Star-forming Galaxies at z = 2–4
Resolved CO(1–0) Emission and Gas Properties in Luminous Dusty Star-forming Galaxies at z = 2–4 Open
We present the results of a survey of CO(1−0) emission in 14 infrared luminous dusty star-forming galaxies (DSFGs) at 2 < z < 4 with the NSF’s Karl G. Jansky Very Large Array. All sources are detected in 12 CO(1−0), with an angular resolut…