A5062030993- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Corrosion Behavior and Inhibition
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- Thyroid Disorders and Treatments
- Solar and Space Plasma Dynamics
- Liver Disease Diagnosis and Treatment
- Hydrogen embrittlement and corrosion behaviors in metals
- Concrete Corrosion and Durability
- Dark Matter and Cosmic Phenomena
- Ocular Surface and Contact Lens
- Ocular Infections and Treatments
- Planetary Science and Exploration
- Advanced Fluorescence Microscopy Techniques
- Diabetes and associated disorders
- SAS software applications and methods
Nicolaus Copernicus Astronomical Center
2025
Polish Academy of Sciences
2025
Michigan State University
2014-2024
Gemini South Observatory
2015-2024
University of La Serena
2023-2024
University of Virginia
2023
The University of Texas Health Science Center at San Antonio
2019-2021
Engineering Arts (United States)
2021
The University of Texas at San Antonio
2019-2020
Universidad Autónoma de Baja California
2018
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
Our current understanding of galaxy evolution still has many uncertainties associated with the details accretion, processing, and removal gas across cosmic time. The next generation radio telescopes will image neutral hydrogen (HI) in galaxies over large volumes at high redshifts, which provide key insights into these processes. We are conducting COSMOS HI Large Extragalactic Survey (CHILES) Karl G. Jansky Very Array, is first survey to simultaneously observe from z=0 z~0.5. Here, we report...
We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties these binaries with low-mass, hydrogen-rich companions are discussed in context 14 and 10 candidate field redbacks. find that neutron stars redbacks have a median mass 1.78 +/- 0.09 M_sun dispersion sigma = 0.21 0.09. Neutron masses excess 2 consistent with, but not firmly demanded by, current...
Two new imaging instruments, ‘Alopeke and Zorro, were designed, built, commissioned at the Gemini-North Gemini-South telescopes in 2018 2019, respectively. Here we describe them present results from over a year of operation. The two identical instruments are based on legacy DSSI (Differential Speckle Survey Instrument) instrument, successfully used for years WIYN Gemini Hawaii Chile. Zorro dual-channel imagers having both speckle (6.7″) “wide-field” (∼1 arcminute) field-of-view options. They...
The reionisation of the Universe is thought to have ended around z~6, as inferred from spectroscopy distant bright background sources, such quasars (QSO) and gamma-ray burst (GRB) afterglows. Furthermore, a GRB afterglow provides insight in its host galaxy, which often too dim study otherwise. We present high S/N VLT/X-shooter spectrum GRB130606A at z=5.913. aim measure degree ionisation IGM between 5.02<z<5.84 chemical abundance pattern dust content galaxy. measured flux decrement due...
The seas play an essential role for the peoples living on their coastal regions, since marine infrastructure is located in coasts. Seawater a corrosive environment that affects particularly polluted seawater. Corrosion and pollution are pernicious chemical, physical processes impair quality of durability structures materials. They aggravated by discharge into sea coast municipal, industrial agricultural effluents, which contain produce toxic highly components biological chemical degradation....
Abstract The sharpest optical images of the R136 cluster in Large Magellanic Cloud are presented, allowing us for first time to resolve members central core, including R136a1, most-massive star known. These data were taken using Gemini speckle imager Zorro medium-band filters with effective wavelengths similar BVRI achieving angular resolutions between 30–40 mas. All stars previously known literature, having V < 16 mag within 2″ × 2″, recovered. Visual companions (≥40 mas; 2000 au)...
ABSTRACT This study focuses on Pristine$\_180956.78$−294759.8 (hereafter P180956, [Fe/H] = −1.95 ± 0.02), a star selected from the Pristine Inner Galaxy Survey (PIGS), and followed-up with recently commissioned Gemini High-resolution Optical SpecTrograph (GHOST) at South telescope. The GHOST spectrograph’s high efficiency in blue spectral region (3700−4800 Å) enables detection of elemental tracers early supernovae (e.g. Al, Mn, Sr, Eu). exhibits chemical signatures resembling those found...
Abstract We present the discovery and characterization of a radio-bright binary in Galactic globular cluster M10. First identified deep radio continuum data from Karl G. Jansky Very Large Array, M10-VLA1 has flux density 27 ± 4 μ Jy at 7.4 GHz flat-to-inverted spectrum. Chandra imaging shows an X-ray source with L X ≈ 10 31 erg s −1 matching location source. This places within scatter radio-X-ray luminosity correlation for quiescent stellar-mass black holes, hole is viable explanation this...
Abstract The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at Gemini-South telescope. In this paper, we present first science results from GHOST taking during its commissioning runs. We have observed bright metal-poor benchmark star HD 122563, along with two stars in ultrafaint dwarf galaxy Reticulum II (Ret ii ), one of which was previously identified as...
Studying and understanding the physical chemical processes that govern hot Jupiters gives us insights on formation of these giant planets. Having a constraint molecular composition their atmosphere can help pinpoint evolution timeline. Namely, metal enrichment carbon-to-oxygen ratio give information about where in protoplanetary disk planet may have accreted its envelope, subsequently, indicate if it went through migration. Here we present first analysis Jupiter HIP 65Ab. Using near-infrared...
We present the discovery of twelve metal-poor and distant pre-main sequence (PMS) candidates in dwarf irregular galaxy Wolf-Lundmark-Melotte (WLM)~968 kpc away, at a present-day metallicity [Fe/H] around $-$0.9. These have masses between 1.25-5 M$_{\odot}$, with ages <10 Myr, exhibit significant near-infrared excesses 2.5 4.3 $\mu$m. They are concentrated within cluster roughly 10 pc (2'') across situated HII region [HM95]-9. most PMS stars known, can offer new quantitative insights into...
Abstract We present the discovery of 12 metal-poor and distant pre–main sequence (PMS) candidates in dwarf irregular galaxy Wolf–Lundmark–Melotte ∼968 kpc away, at a present-day metallicity [Fe/H] ∼ –0.9. These have masses between 1.25 5 M ⊙ , with ages <10 Myr, exhibit significant near-infrared excesses 2.5 4.3 μ m. They are concentrated within cluster roughly 10 pc (2″) across, situated H ii region [HM95]-9. most distant PMS stars known, they can offer new quantitative insights into...
Abstract We present multiwavelength observations of the Swift short γ -ray burst GRB 231117A, localized to an underlying galaxy at redshift z = 0.257 a small projected offset (∼2 kpc). uncover long-lived X-ray Chandra Observatory and radio/millimeter (VLA, MeerKAT, ALMA) afterglow emission, detected ∼37 days ∼20 (rest frame), respectively. measure wide jet (∼10 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mrow> <mml:mo>.</mml:mo> </mml:mrow>...
Abstract In the last decade, available measurements of fluorine abundance have increased significantly, providing additional information on chemical evolution our Galaxy and details complex stellar nucleosynthesis processes. However, observational challenges to obtain F abundances favor samples with higher metallicities, resulting in a scarcity at low-metallicity ($\rm {[Fe/H]}&lt;-2.0$). We present upper limits 7 carbon enhanced metal-poor (CEMP) stars observed Immersion Grating...
Context. Some galaxy clusters exhibit shallow or even cored dark matter density profiles in their central regions rather than the predicted steep cuspy profiles, conflicting with standard understanding of matter. NGC 3311 is cD Hydra I cluster (Abell 1060).
We report five Local Volume dwarf galaxies (two of which are presented here for the first time) uncovered during a comprehensive archival search optical counterparts to ultra-compact high velocity clouds (UCHVCs). The UCHVC population HI thought be candidate gas-rich, low mass halos at edge Group and beyond, but no stellar these systems has been presented. Careful visual inspection all publicly available ultraviolet imaging position UCHVCs revealed six blue, diffuse with morphology...
We present multiwavelength observations of the persistent Fermi-Large Area Telescope unidentified γ-ray source 1FGL J1417.7–4407, showing it is likely to be associated with a newly discovered X-ray binary containing massive neutron star (nearly ) and giant secondary 5.4 day period. SOAR optical spectroscopy at range orbital phases reveals variable double-peaked Hα emission, consistent presence an accretion disk. The lack radio emission evidence for disk suggests unlikely originate in pulsar...
Abstract The Gemini South telescope is now equipped with a new high-resolution spectrograph called the High-resolution Optical SpecTrograph (GHOST). This instrument provides high-efficiency, spectra covering 347–1060 nm in single exposure of either one or two targets simultaneously, along precision radial velocity spectroscopy utilizing an internal calibration source. It can operate at spectral element resolving power 76,000 56,000, and reach signal-to-noise ratio ∼5 1 hr on V ∼ 20.8 mag...
NGC 3311 is the central cD galaxy of Hydra I cluster. We use globular clusters around 3311, combined with kinematical data itself, to investigate dark matter distribution in region I. Radial velocities 118 bright clusters, based on VLT/VIMOS mask spectroscopy, are used calculate velocity dispersions which well defined out 100 kpc. most distant for this kind study has been performed. also determine stellar component from long slit spectroscopy 20 Moreover, we present a new photometric model...
Prevalence of goiter has been studied in 3 villages the central highlands Peru. Visible was found 52% all persons; highest rate women after puberty. endemic cretinism and other obviously defective persons 1.0–3.6%. Severe iodine deficiency indicated by a high 131I thyroid uptake (74.5%) low urinary excretion (UEI) (17.2 μg/24 hr). Plasma thyroxine values tended to be lower normal range, with many individuals below normal, but there no clinical hypothyroidism. In order test effectiveness...
Abstract The objective of this review is to create a body knowledge on the theoretical and practical aspects corrosion inhibition prevent and/or eliminate in natural environments such as water, air, acids industrial facilities oil, gas, concrete, paints coatings, electronics, military equipment. Corrosion inhibitors (CIs) volatile (VCIs) are applied diverse forms powders, pellets, aqueous, or solvent solutions impregnated papers; closed pouches sachets; added coatings. Natural CIs extracted...