A5031325940- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Solar and Space Plasma Dynamics
- Molecular Spectroscopy and Structure
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- nanoparticles nucleation surface interactions
- Nursing care and research
- Advanced Chemical Physics Studies
- Planetary Science and Exploration
- Catalysis and Oxidation Reactions
- Radio Astronomy Observations and Technology
- Health and Lifestyle Studies
- Sleep and related disorders
Atacama Large Millimeter Submillimeter Array
2010-2024
National Radio Astronomy Observatory
2015-2019
University of Chile
2006-2014
Servicio Diabetología Hospital Córdoba
2012
National Astronomical Observatory of Japan
2006-2009
Yale University
2006
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations from the 2014 Long Baseline Campaign in dust continuum and spectral line emission HL Tau region. The images at wavelengths of 2.9, 1.3, 0.87 mm have unprecedented angular resolutions 0 075 (10 AU) to 025 (3.5 AU), revealing an astonishing level detail circumstellar disk surrounding young solar analog Tau, with a pattern bright dark rings observed all wavelengths. By fitting ellipses most distinct rings, we measure...
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions tens milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up ~15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from September late November 2014, culminating in end-to-end observations, calibrations, imaging selected Science Verification (SV) targets. This paper presents an overview campaign its main results,...
We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations the z = 3.042 gravitationally lensed submillimeter galaxy HATLAS J090311.6+003906 (SDP.81). These were carried out using a extended configuration as part Science Verification for 2014 ALMA Long Baseline Campaign, with baselines up to ∼15 km. continuum imaging at 151, 236, and 290 GHz unprecedented angular resolutions fine 23 mas, corresponding an unmagnified spatial scale ∼180...
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C ii] 157.7 μm fine structure line and thermal dust continuum emission from a pair gas-rich galaxies at z = 4.7, BR1202-0725. This system consists luminous quasar host galaxy bright submillimeter (SMG), while fainter star-forming is also spatially coincident within 4'' (25 kpc) region. All three are detected in continuum, indicating FIR luminosities excess 1013 L☉ for two most objects. The SMG both with L[C...
High resolution (1'' $\times$ 2'') ALMA CO(2-1) observations of the ram pressure stripped galaxy NGC 4402 in Virgo cluster show some clearest evidence yet for impacts on molecular ISM a galaxy. The eastern side at $r \sim 4.5$ kpc, upon which is incident, has large (width $\sim$1 height kpc above disk midplane) extraplanar plume gas and dust. Molecular region shows distinct non-circular motions direction pressure; kinematic offset up to 60 km s$^{-1}$ consistent with acceleration by...
ASTE is a 10-m submillimeter telescope operating in Atacama desert northern Chile since 2002 by NAOJ and collaborators. Thanks to the excellent observing condition at site, has been producing numerous astronomical results from star forming regions, Galactic center, Magellanic clouds, nearby galaxies, galaxy clusters. There three major improvements during years 2007-2008: continuum camera "AzTEC", new SIS receiver "CATS345", wide-band spectrometer "WHSF". AzTEC 144 element bolometer array 270...
We investigate the effects of ram pressure on molecular ISM in disk Coma cluster galaxy NGC 4921, via high resolution CO observations. present 6" CARMA CO(1-0) observations full disk, and 0.4" ALMA CO(2-1) leading quadrant, where is strongest. find evidence for compression dense interstellar medium (ISM) side, spatially correlated with intense star formation activity this zone. also detect gas along kiloparsec-scale filaments dust extending into otherwise stripped zone galaxy, seen HST...
Using extensive kinematical and morphological data on two Virgo Cluster galaxies undergoing strong nuclear star formation, we show that ram pressure stripping gravitational interactions can act together have recently fallen into clusters. We present a detailed study of the peculiar H I-deficient spiral NGC 4064 4424 using 12CO 1-0 interferometry, optical imaging, integral field spectroscopic observations in order to learn what type environmental affected these galaxies. Optical imaging...
We present CO(J=3-2) emission observations with the Atacama Submillimeter Telescope Experiment (ASTE) toward 5' x (or 6.6 kpc at distance D = 4.5 Mpc) region of nearby barred spiral galaxy M 83. successfully resolved major structures, i.e., nuclear starburst region, bar, and inner arms in a resolution 22'' 480 pc), showing good spatial coincidence between 6 cm continuum emissions. found global luminosity L'_CO(3-2) 5.1 10^8 K km s^-1 pc^2 within observed region. also disk (0.5 < r 3.5 kpc)...
We present distance estimates for 11 peculiar Virgo Cluster spiral galaxies based on measurements of the stellar kinematics their central 2 kpc. Stellar circular velocities were obtained using two-integral dynamical models. Distances by comparing, at each radius, with synthetic Hα rotation curves derived from NIR Tully-Fisher relations. The results show that most our are located within 4 Mpc core cluster. Three these galaxies, previously classified as "low rotator galaxies" or...
We present observations of an H i cloud complex most likely located in the Virgo galaxy cluster, first reported by Kent et al. The consists five clouds, detected dataset ALFALFA extragalactic survey at Arecibo. clouds have radial velocities between cz☉∼ 480 and 610 km s−1. At cluster distance, they are spread over a projected span 170 kpc masses ranging from 0.48 to 1.7 ×108 M☉. overall mass is 5.1 × 108 clouds' velocity widths vary 50 250 New results follow-up aperture synthesis conducted...
We present the stellar and ionized gas kinematics of 13 bright peculiar Virgo cluster galaxies observed with DensePak Integral Field Unit at WIYN 3.5 m telescope in order to look for kinematic evidence that these have experienced gravitational interactions or stripping. Two-dimensional maps velocity V, dispersion σ, (Hβ and/or [O iii]) are presented sample. The rotation curves profiles determined galaxies, 6 galaxies. Misalignments between optical kinematical major axes found several While...
Abstract Wolf–Lundmark–Melotte (WLM) is a Local Group dwarf irregular (dIrr) galaxy with metallicity 13% of solar. At 1 Mpc, the relative isolation WLM provides unique opportunity to investigate internal mechanisms star formation at low metallicities. The earliest stages in larger spirals occur embedded clusters within molecular clouds, but dIrrs lack dust, heavy metals, and organized structure believed necessary collapse clouds into stars. Despite actively forming stars, early not well...
The object of this study is one the most energetic and luminous molecular outflows known in Galaxy, G331.512−0.103. Observations with ALMA Band 7 (350 GHz; 0.86 mm) reveal a very compact, extremely young bipolar outflow more symmetric outflowing shocked shell surrounding small region ionized gas. velocities are about 70 km s−1 on either side systemic velocity. expansion velocity ∼24 s−1, implying crossing time 2000 yr. Along symmetry axis outflow, there feature, which could be "bullet"...
We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum images of the asteroid 3 Juno obtained with an angular resolution (60 km at 1.97 AU). The data were over a single 4.4 hr interval, which covers 60% 7.2 rotation period, approximately centered on local transit. A sequence 10 consecutive reveals continuous changes in asteroid's profile and apparent shape, good agreement sky projection three-dimensional model Database Asteroid Models from Inversion Techniques....
Abstract We report on a deep search for $^{12}$CO ($J$=3–2) line emission from the host galaxy of GRB 980425 with Atacama Submillimeter Telescope Experiment (ASTE). observed five points galaxy, covering entire region. After combining all spectra, we obtained global spectrum rms noise level 3.3 mK in $T_{\mathrm{mb}}$ scale at velocity resolution 10 $\mathrm{km\ s^{-1}}$. No significant was detected, though found marginal feature range corresponding to redshift galaxy. derived 3 $\sigma$...
<i>Context. <i/>The process of high-mass star formation is still shrouded in controversy. Models are tentative and current observations just beginning to probe the densest inner regions giant molecular clouds. <i>Aims. study requires observation analysis high-density gas. This can be achieved by detection emission from higher rotational transitions molecules sub-millimeter. Here, we studied clump G30.79 FIR 10 observing 345 GHz band. The goal understand gravitational state this clump,...
Here we present new ALMA observations of polarized dust emission from six the most massive clumps in W43-Main. The MM2, MM3, MM4, MM6, MM7, and MM8, have been resolved into two populations fragmented filaments. From these extracted 81 cores (96 with MM1 cores) masses between 0.9 \Msun\ to 425 a mass sensitivity 0.08 M$_{\odot}$. MM8 show significant fragmentation, but intensity appears be sparse compact. MM4 population shows less single proto-stellar core dominating at each clump. Also, is...
We present CO(3-2) emission observations toward the 3'x3' (or 20x20kpc at a distance of 23Mpc) region southern barred spiral galaxy NGC 986 using Atacama Submillimeter Telescope Experiment (ASTE). This effort is part our on-going extragalactic imaging project ADIoS (ASTE Dense gas Imaging Spiral galaxies). Our image revealed presence large (the major axis 14 kpc in total length) gaseous bar filled with dense molecular medium along dark lanes observed optical images. largest ``dense-gas rich...
Wolf-Lundmark-Melotte (WLM) is a Local Group dwarf irregular (dIrr) galaxy with metallicity 13% of solar. At 1 Mpc, the relative isolation WLM provides unique opportunity to investigate internal mechanisms star formation at low metallicities. The earliest stages in larger spirals occur embedded clusters within molecular clouds, but dIrrs lack dust, heavy metals, and organized structure believed necessary collapse clouds into stars. Despite actively forming stars, early not well understood....
Abstract Atacama Submillimeter Telescope Experiment (ASTE) is a joint project between Japan and Chile for installing operating 10 m high precision telescope in the Desert order to explore southern sky through submillimeter wavelength. We have achieved an accuracy of 19 μm (rms) main reflector surface stable radio pointing about 2 arcsec (rms). A 350 GHz cartridge type SIS mixer receiver achieves good performance with typical system noise temperature 150 ~ 250 K DSB beam efficiency 0.6 0.7...
Abstract Understanding stellar birth requires observations of the clouds in which they form. These are dense and self-gravitating, all existing observations, molecular with H 2 dominant species CO best available. When abundances carbon oxygen low compared to hydrogen, opacity from dust is also low, as primeval galaxies local dwarf irregular forms slowly easily destroyed, so it cannot accumulate inside clouds. Then we lose our ability trace gas regions star formation critical information on...