A5063195434- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Adaptive optics and wavefront sensing
- Molecular Spectroscopy and Structure
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- History and Developments in Astronomy
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
Search for Extraterrestrial Intelligence
2015-2024
Pioneer (Japan)
2024
Seoul National University
2024
RIKEN
2024
Ames Research Center
2011-2020
University of Calgary
2017
Queen Mary University of London
2017
William Harvey Research Institute
2017
Canada's Michael Smith Genome Sciences Centre
2017
Netherlands Institute for Neuroscience
2017
The Multiband Imaging Photometer for Spitzer (MIPS) provides long-wavelength capability the mission in imaging bands at 24, 70, and 160 μm measurements of spectral energy distributions between 52 100 a resolution about 7%. By using true detector arrays each band, it both critical sampling point-spread function relatively large fields view, allowing substantial advances sensitivity, angular resolution, efficiency areal coverage compared with previous space far-infrared capabilities. 24 array...
The Stratospheric Observatory For Infrared Astronomy (SOFIA) is an airborne observatory consisting of a specially modified Boeing 747SP with 2.7 m telescope, flying at altitudes as high 13.7 km (45,000 ft). Designed to observe wavelengths from 0.3 μm 1.6 mm, SOFIA operates above 99.8% the water vapor that obscures much infrared and submillimeter. has seven science instruments under development, including occultation photometer, near-, mid-, far-infrared cameras, spectrometers, heterodyne...
We present the stellar calibrator sample and conversion from instrumental to physical units for 24 micron channel of Multiband Imaging Photometer Spitzer (MIPS). The primary calibrators are A stars, calibration factor based on those stars is 4.54*10^{-2} MJy sr^{-1} (DN/s)^{-1}, with a nominal uncertainty 2%. discuss data-reduction procedures required attain this accuracy; without these procdures, obtained using automated pipeline at Science Center 1.6% +/- 0.6% lower. extend work predict...
While shell-like, Crab-like, and composite supernova remnants (SNRs) represent well-defined classes, there is another group of SNRs with different X-ray radio morphologies: shell-like in the centrally filled (with little or no limb brightening). We present results a systematic study 19 such remnants, using ROSAT ASCA data. show that they have physical environmental properties distinct from other categories, we propose form unique class term "mixed-morphology" remnants. found two prominent...
Using Infrared Array Camera (IRAC) images at 3.6, 4.5, 5.8, and 8 μm from the GLIMPSE Legacy science program on Spitzer Space Telescope, we searched for infrared counterparts to 95 known supernova remnants that are located within Galactic longitudes 65° > |l| 10° latitudes |b| < 1°. Eighteen were detected. Many other could have significant emission but in portions of Milky Way too confused allow separation bright H II regions pervasive mid-infrared atomic molecular clouds along line sight....
We performed Spitzer Infrared Spectrograph mapping observations covering nearly the entire extent of Cassiopeia A supernova remnant (SNR), producing mid-infrared (5.5-35 μm) spectra every 5''-10''. Gas lines Ar, Ne, O, Si, S, and Fe, dust continua were strong for most positions. identify three distinct ejecta populations based on their continuum shapes. The dominant shape exhibits a peak at 21 μm. line-free map μm made from 19-23 range closely resembles [Ar II], [O IV], [Ne II] ejecta-line...
The absolute calibration and characterization of the Multiband Imaging Photometer for Spitzer (MIPS) 70 μm coarse‐ fine‐scale imaging modes are presented based on over 2.5 yr observations. Accurate photometry (especially faint sources) requires two simple processing steps beyond standard data reduction to remove long‐term detector transients. Point‐spread function (PSF) fitting is found give more accurate flux densities than aperture photometry. Based PSF photometry, factor shows no strong...
Whether supernovae are major sources of dust in galaxies is a long-standing debate. We present infrared and submillimeter photometry spectroscopy from the Herschel Space Observatory Crab Nebula between 51 670 μm as part Mass Loss Evolved StarS program. compare emission detected with multiwavelength data including millimeter, radio, mid-infrared, archive optical images. carefully remove synchrotron component using Planck fluxes measured same epoch. The contribution line removed combined...
Theoretical models predict that core-collapse supernovae (CCSNe) can be efficient dust producers (0.1-1.0 Msun), potentially accounting for most of the production in early Universe. Observational evidence this efficiency is however currently limited to only a few CCSN remnants (e.g., SN1987A, Crab Nebula). In paper, we revisit mass produced Cassiopeia A (Cas A), ~330-year old O-rich Galactic supernova remnant (SNR) embedded dense interstellar foreground and background. We present first...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
Abstract We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up NIRCam and MIRI imaging mosaics that map emission main shell, interior, surrounding circumstellar/interstellar material (CSM/ISM). also four exploratory positions Medium Resolution Spectrograph integral field unit spectroscopy sample ejecta, CSM, associated dust representative shocked unshocked regions. Surprising...
High resolution millimeter-wave and near-infrared observations of the supernova remnants W28 W44 reveal extensive shocked molecular gas where blast waves are propagating into giant clouds. New CO were carried out with IRAM 30-m ARO 12-m telescopes, Palomar 200-inch telescope. The H2 emission from both remnants, showing intricate networks filaments on arcsec scales, following bright ridges radio shells. CS linewidths, indicative shock speed, 20-30 km/s. Both attributed to shocks density >1e3...
We used the Spitzer Space Telescope's Infrared Spectrograph to map nearly entire extent of Cassiopeia A between 5-40 micron. Using infrared and Chandra X-ray Doppler velocity measurements, along with locations optical ejecta beyond forward shock, we constructed a 3-D model remnant. The structure Cas can be characterized into spherical component, tilted thick disk, multiple jets/pistons fast-moving knots all populating disk plane. Bright Ring in identifies intersection plane/pistons roughly...
We report results from a multi-wavelength analysis of the Galactic SNR RCW 86, proposed remnant supernova 185 A.D. new infrared observations {\it Spitzer} and WISE}, where entire shell is detected at 24 22 $\mu$m. fit flux ratios with models collisionally heated ambient dust, finding post-shock gas densities in non-radiative shocks 2.4 2.0 cm$^{-3}$ SW NW portions remnant, respectively. The Balmer-dominated around periphery shell, large amount iron X-ray emitting ejecta, lack compact support...
We have used the Caltech Submillimeter Observatory (CSO) to follow-up a sample of WISE-selected, hyperluminous galaxies, so called W1W2-dropout galaxies. This is rare (~ 1000 all-sky) population galaxies at high redshift (peaks z=2-3), that are faint or undetected by WISE 3.4 and 4.6 um, yet clearly detected 12 22 um. The optical spectra most these show significant AGN activity. observed 14 high-redshift (z > 1.7) with SHARC-II 350 850 9 detections; 18 Bolocam 1.1 mm, five detections. Warm...
Abstract We present photometric and spectroscopic data of SN 2018lab, a low-luminosity Type IIP supernova (LLSN) with V -band peak luminosity −15.1 ± 0.1 mag. 2018lab was discovered by the Distance Less Than 40 Mpc (DLT40) survey only 0.73 days post-explosion, as determined observations from Transiting Exoplanet Survey Satellite (TESS). TESS yield densely sampled, fast-rising, early-time light curve likely powered ejecta–circumstellar medium (CSM) interaction. The blueshifted, broadened...
We present optical and near-infrared (NIR) observations of the Type Icn supernova (SN Icn) 2022ann, fifth member its newly identified class SNe. Its early spectra are dominated by narrow carbon oxygen P-Cygni features with absorption velocities 800 km/s; slower than other SNe indicative interaction a dense, H/He-poor circumstellar medium (CSM) that is outflowing typical Wolf-Rayet wind velocity $>$1000 km/s. identify helium in NIR obtained two weeks after maximum at three weeks,...
Abstract We present high-cadence photometric and spectroscopic observations of SN 2023axu, a classical Type II supernova with an absolute V -band peak magnitude –17.2 ± 0.1 mag. 2023axu was discovered by the Distance Less Than 40 Mpc (DLT40) survey within 1 day last nondetection in nearby galaxy NGC 2283 at 13.7 Mpc. modeled early light curve using recently updated shock cooling model that includes effects line blanketing found explosion epoch to be MJD 59971.48 0.03 probable progenitor red...
Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), luminous V -band peak M = −18.42 ± 0.08 mag), and rapid early decline rate s 1 3.47 0.09 mag (50 days) −1 ). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant ZAMS 19–25 ⊙ . Independent comparisons nebular spectral models also suggest an initial He-core mass of ∼6 , thus progenitor. For IIP,...
We present near-infrared narrowband images of the supernova remnant W49 B, taken with WIRC instrument on Hale 200 inch (5 m) telescope Mount Palomar. The 1.64 μm [Fe II] image reveals a barrel-shaped structure coaxial rings, which is suggestive bipolar wind structures surrounding massive stars. 2.12 shocked molecular hydrogen extends 1.9 pc outside emission to southeast. also archival Chandra data, show an X-ray jetlike along axis barrel, flaring at each end. Fitting single-temperature...
We present infrared (IR) and submillimetre observations of the Crab-like supernova remnant (SNR) G54.1+0.3 including 350|$\mu$|m (SHARC-II), 870|$\mu$|m (LABOCA), 70, 100, 160, 250, 350, 500 |$\mu$|m (Herschel), 3–40 (Spitzer). detect dust features at 9, 11, 21 a long-wavelength continuum component. The coincides with [Ar ii] ejecta emission, feature is remarkably similar to that in Cas A. IRAC 8|$\mu$|m image Ar distributed shell-like morphology which coincident features, suggesting has...
Optical and infrared polarization mapping recent Planck observations of the filamentary cloud L1495 in Taurus show that large-scale magnetic field is approximately perpendicular to long axis cloud. We use HAWC+ polarimeter on SOFIA probe complex B211 part Our results reveal a dispersion angles $36^\circ$, about five times measured larger scale by Planck. Applying Davis-Chandrasekhar-Fermi (DCF) method with velocity information obtained from IRAM 30m C$^{18}$O(1-0) observations, we find two...
We present initial results from a JWST survey of the youngest Galactic core-collapse supernova remnant Cassiopeia A (Cas A), made up NIRCam and MIRI imaging mosaics that map emission main shell, interior, surrounding circumstellar/interstellar material (CSM/ISM). also four exploratory positions MIRI/MRS IFU spectroscopy sample ejecta, CSM, associated dust representative shocked unshocked regions. Surprising discoveries include: 1) web-like network ejecta filaments resolved to 0.01 pc scales...
The supernova remnant (SNR) Cassiopeia A ( offers a unique opportunity to study (SN) explosion dynamics and interactions with the circumstellar medium (CSM). Recent observations James Webb Space Telescope (JWST) have unveiled an enigmatic structure within remnant, termed "Green Monster" (GM), whose properties indicate CSM origin. Our goal is investigate of GM uncover origin its intriguing pockmarked structure, characterized by nearly circular holes rings. We aim examine role small-scale...