Supernova remnant ≈ Supernova remnant
View article: The 2HWC HAWC Observatory Gamma-Ray Catalog
The 2HWC HAWC Observatory Gamma-Ray Catalog Open
We present the first catalog of TeV gamma-ray sources realized with data from the newly completed High Altitude Water Cherenkov Observatory (HAWC). It is the most sensitive wide field-of-view TeV telescope currently in operation, with a on…
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THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG Open
To uniformly determine the properties of supernova remnants (SNRs) at high energies, we have developed the first systematic survey at energies from 1 to 100 GeV using data from the Fermi Large Area Telescope (LAT). Based on the spatial ove…
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Molecular gas kinematics within the central 250 pc of the Milky Way Open
Using spectral line observations of HNCO, N2H+, and HNC, we investigate the kinematics of dense gas in the central ∼250 pc of the Galaxy. We present SCOUSE (Semi-automated multi-COmponent Universal Spectral-line fitting Engine), a line-fit…
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Cool WISPs for stellar cooling excesses Open
Several stellar systems (white dwarfs, red giants, horizontal branch stars and possibly the neutron star in the supernova remnant Cassiopeia A) show a mild preference for a non-standard cooling mechanism when compared with theoretical mode…
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The dust mass in Cassiopeia A from a spatially resolved<i>Herschel</i>analysis Open
Theoretical models predict that core-collapse supernovae (CCSNe) can be efficient dust producers (0.1–1.0 M⊙), potentially accounting for most of the dust production in the early Universe. Observational evidence for this dust production ef…
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Non-cosmological FRBs from young supernova remnant pulsars Open
We propose a new extra but non-cosmological explanation for fast radio bursts (FRBs) based on very young pulsars in supernova remnants. Within a few hundred years of a core-collapse supernova, the ejecta is confined within ∼1 pc, providing…
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Protostars: Forges of cosmic rays? Open
It is largely accepted that Galactic cosmic rays, which pervade the interstellar medium, originate by means of shock waves in supernova remnants. Cosmic rays activate the rich chemistry that is observed in a molecular cloud and they also r…
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THE DISTRIBUTION OF RADIOACTIVE <sup>44</sup>Ti IN CASSIOPEIA A Open
The distribution of elements produced in the innermost layers of a supernova explosion is a key diagnostic for studying the collapse of massive stars. Here we present the results of a 2.4 Ms NuSTAR observing campaign aimed at studying the …
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The Remnant of Supernova 1987A Open
Although it has faded by a factor of ∼10 7 , SN 1987A is still bright enough to be observed in almost every band of the electromagnetic spectrum. Today, the bolometric luminosity of the debris is dominated by a far-infrared (∼200μm) contin…
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Limit on the axion decay constant from the cooling neutron star in Cassiopeia A Open
The observed rapid cooling of the neutron star (NS) located at the center of\nthe supernova remnant Cassiopeia A (Cas A) can be explained in the minimal NS\ncooling scenario. This consequence may be changed if there exists an extra\ncoolin…
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MODELING SNR CASSIOPEIA A FROM THE SUPERNOVA EXPLOSION TO ITS CURRENT AGE: THE ROLE OF POST-EXPLOSION ANISOTROPIES OF EJECTA Open
The remnants of core-collapse supernovae (SNe) have complex morphologies that may reflect asymmetries and structures developed during the progenitor SN explosion. Here we investigate how the morphology of the supernova remnant Cassiopeia A…
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THE IMPACT OF A SUPERNOVA REMNANT ON FAST RADIO BURSTS Open
Fast radio bursts (FRBs) are millisecond bursts of radio radiation whose progenitors, so far, remain mysterious. Nevertheless, the timescales and energetics of these events have lead to many theories associating FRBs with young neutron sta…
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Galactic supernova remnant candidates discovered by THOR Open
There is a considerable deficiency in the number of known supernova remnants\n(SNRs) in the Galaxy compared to that expected. Searches for extended\nlow-surface brightness radio sources may find new Galactic SNRs, but confusion\nwith the m…
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Non-linear diffusion of cosmic rays escaping from supernova remnants – I. The effect of neutrals Open
Supernova remnants are believed to be the main sources of galactic cosmic rays (CR). Within this framework, particles are accelerated at supernova remnant shocks and then released in the interstellar medium. The mechanism through which CRs…
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A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A Open
It is widely believed that the bulk of the Galactic cosmic rays is accelerated in supernova remnants (SNRs). However, no observational evidence of the presence of particles of PeV energies in SNRs has yet been found. The young historical S…
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Simulations of the Milky Way’s central molecular zone – I. Gas dynamics Open
We use hydrodynamical simulations to study the Milky Way’s central molecular zone (CMZ). The simulations include a non-equilibrium chemical network, the gas self-gravity, star formation, and supernova feedback. We resolve the structure of …
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Hydrodynamical Neutron-star Kicks in Electron-capture Supernovae and Implications for the CRAB Supernova Open
Neutron stars (NSs) obtain kicks, typically of several 100 km s −1 , at birth. The gravitational tugboat mechanism can explain these kicks as consequences of asymmetric mass ejection during the supernova (SN) explosion. Support for this hy…
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Dust destruction by the reverse shock in the Cassiopeia A supernova remnant Open
Core collapse supernovae (CCSNe) are important sources of interstellar dust, potentially capable of producing one solar mass of dust in their explosively expelled ejecta. However, unlike other dust sources, the dust has to survive the pass…
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The impact of fallback on the compact remnants and chemical yields of core-collapse supernovae Open
Fallback in core-collapse supernovae plays a crucial role in determining the properties of the compact remnants and of the ejecta composition. We perform three-dimensional simulations of mixing and fallback for selected non-rotating supern…
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Central compact objects in supernova remnants Open
Central Compact Objects (CCOs) are a handful of sources located close to the\ngeometrical center of young supernova remnants. They only show thermal-like,\nsoft X-ray emission and have no counterparts at any other wavelength. While the\nfi…
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The Dispersion and Rotation Measure of Supernova Remnants and Magnetized Stellar Winds: Application to Fast Radio Bursts Open
Recent studies of fast radio bursts (FRBs) have led to many theories associating them with young neutron stars. If this is the case, then the presence of supernova ejecta and stellar winds provides a changing dispersion measure (DM) and ro…
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Comparing Neutron Star Kicks to Supernova Remnant Asymmetries Open
Supernova explosions are inherently asymmetric and can accelerate new-born neutron stars (NSs) to hundreds of km s −1 . Two prevailing theories to explain NS kicks are ejecta asymmetries (e.g., conservation of momentum between NS and eject…
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Dust survival rates in clumps passing through the Cas A reverse shock – I. Results for a range of clump densities Open
The reverse shock in the ejecta of core-collapse supernovae is potentially able to destroy newly formed dust material. In order to determine dust survival rates, we have performed a set of hydrodynamic simulations using the grid-based code…
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Gamma-ray Observations of Tycho’s Supernova Remnant with VERITAS and Fermi Open
High-energy gamma-ray emission from supernova remnants (SNRs) has provided a unique perspective for studies of Galactic cosmic-ray acceleration. Tycho’s SNR is a particularly good target because it is a young, type Ia SNR that has been wel…
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Pulsar timing for the <i><b>Fermi</b></i> gamma-ray space telescope Open
Here, we describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The detection and study of pulsars in gamma rays give insights into the populations of…
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A Massive Shell of Supernova-formed Dust in SNR G54.1+0.3 Open
While theoretical models of dust condensation predict that most refractory elements produced in core-collapse supernovae (SNe) efficiently condense into dust, a large quantity of dust has so far only been observed in SN 1987A. We present a…
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Revised Distances to 21 Supernova Remnants Open
We carry out a comprehensive study of H i 21 cm line observations and 13 CO line observations of 21 supernova remnants (SNRs). The aim of the study is to search for H i absorption features to obtain kinematic distances in a consistent mann…
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QUIJOTE scientific results – II. Polarisation measurements of the microwave emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44 Open
We present Q-U-I JOint TEnerife (QUIJOTE) intensity and polarisation maps at\n10-20 GHz covering a region along the Galactic plane 24<l<45 deg, |b|<8 deg.\nThese maps result from 210 h of data, have a sensitivity in polarisation of ~40\nmu…
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Dust masses for SN 1980K, SN1993J and Cassiopeia A from red–blue emission line asymmetries Open
We present Monte Carlo line transfer models that investigate the effects of\ndust on the very late time emission line spectra of the core collapse\nsupernovae SN 1980K and SN 1993J and the young core collapse supernova remnant\nCassiopeia …
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A dust twin of Cas A: cool dust and 21 μm silicate dust feature in the supernova remnant G54.1+0.3 Open
We present infrared (IR) and submillimeter observations of the Crab-like supernova remnant (SNR) G54.1+0.3 including 350μm (SHARC-II), 870μm (LABOCA), 70, 100, 160, 250, 350, 500μm (Herschel) and 3-40μm (Spitzer). We detect dust features a…