A5023644739- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- MicroRNA in disease regulation
- Advanced biosensing and bioanalysis techniques
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- RNA modifications and cancer
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Optical Systems and Laser Technology
- Geological and Geophysical Studies
- Infrared Target Detection Methodologies
- Nanoplatforms for cancer theranostics
- Trace Elements in Health
- Impact of Light on Environment and Health
- History and Developments in Astronomy
- Geological formations and processes
- Astro and Planetary Science
- Nanoparticle-Based Drug Delivery
- Monoclonal and Polyclonal Antibodies Research
Australian National University
2004-2024
University of the West Indies
2024
Michigan State University
2024
Mount Stromlo Observatory
2019-2023
Athinoula A. Martinos Center for Biomedical Imaging
2023
Massachusetts General Hospital
2023
Harvard University
2023
California Institute of Technology
2009-2019
University of Hawaii System
2018
AdTech Optics (United States)
2008-2016
Palomar Gattini-IR is a new wide-field, near-infrared (NIR) robotic time domain survey operating at Observatory. Using 30 cm telescope mounted with H2RG detector, achieves field of view (FOV) 25 sq. deg. pixel scale 87 in J-band. Here, we describe the system design, operations, data processing and on-sky performance Gattini-IR. As part nominal survey, scans ≈7500 square degrees sky every night to median 5σ depth 15.7 AB mag outside Galactic plane. The covers ≈15,000 visible from cadence 2...
Fibre Multi-Object Spectrograph (FMOS) is the first near-infrared instrument with a wide field of view capable acquiring spectra simultaneously from up to 400 objects. It has been developed as common-use for F$/$2 prime-focus Subaru Telescope. The coverage 30$^\prime$ diameter achieved using new 3-element corrector optimized in (0.9–1.8$\ \mu$m) wavelength range. Due limited space at prime-focus, we have had develop novel fibre positioner, called “Echidna”, together two OH-airglow suppressed...
Abstract We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer /IRAC, we searched 190 nearby galaxies with cadence baselines of one month and six months. discovered over 1958 variables 43 transients. Here, describe survey design highlight 14 unusual transients no optical counterparts to deep limits, which refer as SPRITEs (eSPecially Red Intermediate-luminosity...
The Palomar Cosmic Web Imager (PCWI), an integral field spectrograph designed to detect and map low surface brightness emission, has obtained imaging spectroscopic maps of Ly-alpha from the circum-QSO medium (CQM) QSO HS1549+19 at redshift 2.843. Extensive extended emission is detected CQM, consistent with fluorescent pumped produced by ionizing continuum QSO. Many features present in PCWI spectral images match those narrow-band images. Filamentary structures narrow line profiles are several...
We report on the design and performance of Keck Cosmic Web Imager (KCWI), a general purpose optical integral field spectrograph that has been installed at Nasmyth port 10 m II telescope Mauna Kea, HI. The novel provides blue-optimized seeing-limited imaging from 350-560 nm with configurable spectral resolution 1000 - 20000 in view up to 20"x33". Selectable volume phase holographic (VPH) gratings high dielectric, multilayer silver enhanced aluminum coatings provide end-to-end peak efficiency...
Abstract We report observations of the optical counterpart long gamma-ray burst GRB 221009A. Due to extreme rarity being both nearby ( z = 0.151) and highly energetic E γ ,iso ≥ 10 54 erg), 221009A offers a unique opportunity probe connection between massive star core collapse relativistic jet formation across very broad range -ray properties. Adopting phenomenological power-law model for afterglow host galaxy estimates from high-resolution Hubble Space Telescope imaging, we use Bayesian...
We describe the results from a new instrument which combines Lucky Imaging and adaptive optics (AO) to give first routine direct diffraction-limited imaging in visible on 5 m telescope. With fast image selection alignment behind Palomar AO system we obtained Strehl ratios of 5%–20% at 700 nm typical range seeing conditions, with median approximately 12% when 10% input frames are selected. At wavelengths around gave 35 mas full width half-maxima (FWHMs). 950 output ratio was as high 36% 500...
The intergalactic medium (IGM) is the dominant reservoir of baryons, delineates large scale structure at low to moderate overdensities, and provides gas from which galaxies form evolve. Simulations a Cold Dark Matter (CDM) dominated universe predict that IGM distributed in cosmic web filaments, should along intersections these filaments (Bond et al. 1994; Miralda-Escude 1996). While observations QSO absorption lines distribution have confirmed CDM paradigm, has never been by direct imaging....
The third observing run by LVC has brought the discovery of many compact binary coalescences. Following detection first neutron star merger in this (LIGO/Virgo S190425z), we performed a dedicated follow-up campaign with Zwicky Transient Facility (ZTF) and Palomar Gattini-IR telescopes. initial skymap single-detector gravitational wave (GW) trigger spanned most sky observable from Observatory. Covering 8000 deg$^2$ over next two nights, corresponding to 46\% integrated probability, ZTF system...
Post starburst E+A galaxies show indications of a powerful that was quenched abruptly. Their disturbed, bulge-dominated morphologies suggest they are merger remnants. The more massive suggested to be by AGN feedback, yet little is known about AGN-driven winds in this short-lived phase. We present spatially-resolved IFU spectroscopy the Keck Cosmic Web Imager SDSS J003443.68+251020.9, at z=0.118. system consists two galaxies, larger which post galaxy hosting an AGN. Our modelling suggests 400...
IRIS is a near-infrared (0.84 to 2.4 micron) integral field spectrograph and wide-field imager being developed for first light with the Thirty Meter Telescope (TMT). It mounts advanced adaptive optics (AO) system NFIRAOS has integrated on-instrument wavefront sensors (OIWFS) achieve diffraction-limited spatial resolution at wavelengths longer than 1 μm. With moderate spectral (R ~ 4000 – 8,000) large bandpass over continuous of view, will open new opportunities in virtually every area...
ABSTRACT How galaxies form from, and are fueled by, gas from the intergalactic medium (IGM) remains one of major unsolved problems in galaxy formation. While classical Cold Dark Matter paradigm posits forming cooling virialized gas, recent theory numerical simulations have highlighted importance cold accretion flows—relatively cool ( T ∼ few × 104 K) unshocked streaming along filaments into dark matter halos, including hot, massive, high-redshift halos. These flows thought to deposit angular...
The PLATeau Observatory (PLATO) is an automated self-powered astrophysical observatory that was deployed to Dome A, the highest point on Antarctic plateau, in 2008 January. PLATO consists of a suite site-testing instruments designed quantify benefits A site for astronomy, and science take advantage unique observing conditions. Instruments include CSTAR, array optical telescopes transient astronomy; Gattini, instrument measure sky brightness cloud cover statistics; DASLE, experiment...
ABSTRACT The i -band observing conditions at Dome A on the Antarctic plateau have been investigated using data acquired during 2008 with Chinese Small Telescope Array. sky brightness, variations in atmospheric transparency, cloud cover, and presence of aurorae are obtained from these images. median brightness moonless clear nights is 20.5 mag arcsec −2 SDSS band south celestial pole (which includes a contribution about 0.06 diffuse Galactic light). over all Moon phases winter 19.8 . There...
The Keck Cosmic Web Imager (KCWI) is a new facility instrument being developed for the W. M. Observatory and funded construction by Telescope System Instrumentation Program (TSIP) of National Science Foundation (NSF). KCWI bench-mounted spectrograph II right Nasmyth focal station, providing integral field spectroscopy over seeing-limited up to 20"x33" in extent. Selectable Volume Phase Holographic (VPH) gratings provide high efficiency spectral resolution range 1000 20000. dual-beam design...
We present observations of SN 2020fqv, a Virgo-cluster Type II core-collapse supernova (CCSN) with high temporal resolution light curve from the Transiting Exoplanet Survey Satellite (TESS) covering time explosion; ultraviolet (UV) spectroscopy Hubble Space Telescope (HST) starting 3.3 days post-explosion; ground-based spectroscopic 1.1~days along extensive photometric observations. Massive stars have complicated mass-loss histories leading up to their death as CCSNe, creating circumstellar...
The next generation of giant-segmented mirror telescopes ($>$ 20 m) will enable us to observe galactic nuclei at much higher angular resolution and sensitivity than ever before. These capabilities introduce a revolutionary shift in our understanding the origin evolution supermassive black holes by enabling more precise hole mass measurements range that is unreachable today. We present simulations predictions observations be made with Thirty Meter Telescope (TMT) adaptive optics assisted...
We present an overview of the design IRIS, infrared (0.84 - 2.4 micron) integral field spectrograph and imaging camera for Thirty Meter Telescope (TMT). With extremely low wavefront error (<30 nm) on-board sensors, IRIS will take advantage high angular resolution narrow adaptive optics system (NFIRAOS) to dissect sky at diffraction limit 30-meter aperture. a primary spectral 4000 spatial sampling starting 4 milliarcseconds, instrument create unparalleled ability explore redshift galaxies,...
Abstract Enormous Ly α nebulae (ELANe) represent the extrema of nebulosities. They have detected extents >200 kpc in and luminosities >10 44 erg s −1 . The ELAN population is an ideal laboratory to study interactions between galaxies intergalactic/circumgalactic medium (IGM/CGM) given their brightness sizes. current sample size ELANe still very small, few z ≈ 2 discovered date are all associated with local overdensities active galactic nuclei (AGNs). Inspired by these results, we...
Abstract The era of all-sky space astrometry began with the Hipparcos mission in 1989 and provided first very accurate catalogue apparent magnitudes, positions, parallaxes proper motions 120 000 bright stars at milliarcsec (or per year) accuracy level. has now been superseded by results Gaia mission. second data release contained astrometric for almost 1.7 billion sources tens microarcsec a vast volume Milky Way future releases will further improve on this. just completed its nominal 5-year...