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Supernova Remnants in the Irregular Galaxy NGC4449
P. Frank Winkler, Knox S. Long, William P. Blair
The nearby irregular galaxy NGC4449 has a star formation rate of about 0.4 solar masses/yr and should host of order 70 SNRs younger than 20,000 years, a typical age for SNRs expand…
Dissecting the Mid-Infrared Heart of M83 with JWST
Svea Hernandez, Logan Jones, Linda J. Smith +9
We present a first look at the MRS observations of the nucleus of the nearby galaxy M83, taken with MIRI onboard JWST. The observations show a rich set of emission features from th…
High-Resolution Spectra of Supernova Remnants in M83
P. Frank Winkler, Knox S. Long, William P. Blair +1
In order to better characterize the rich supernova remnant (SNR) population of M83 (NGC 5236), we have obtained high-resolution (about 85 km/s) spectra of 119 of the SNRs and SNR c…
Stellar feedback in M83 as observed with MUSE -- II. Analysis of the HII region population: ionisation budget and pre-SN feedback
Lorenza Della Bruna, Angela Adamo, Anna F. McLeod +11
We study pre-supernova feedback in a sample of 4700 HII regions in the nearby spiral galaxy M83, identified on their H emission. We pectroscopically identify Wolf-Rayet (…
Stellar feedback in M83 as observed with MUSE -- I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
Lorenza Della Bruna, Angela Adamo, Philippe Amram +14
We present a large VLT/MUSE mosaic (3.8 x 3.8 kpc) of the nearby spiral galaxy M83, with a spatial resolution ~20 pc. We obtained the kinematics of the stars and ionised gas, and c…
Optical Identification and Spectroscopy of Supernova Remnants in the Galaxy M51
P. Frank Winkler, Sadie C. Coffin, William P. Blair +2
Using a combination of ground-based and HST imaging, we have constructed a catalog of 179 supernova remnants (SNRs) and SNR candidates in the nearby spiral galaxy M51. Follow-up sp…
First Co-spatial Comparison of Stellar, Neutral-, and Ionized-gas Metallicities in a metal-rich galaxy: M83
Svea Hernandez, Alessandra Aloisi, Bethan L. James +14
We carry out a comparative analysis of the metallicities from the stellar, neutral-gas, and ionized-gas components in the metal-rich spiral galaxy M83. We analyze spectroscopic obs…
Turbulence and Particle Acceleration in Radiative Shock Waves in the Cygnus Loop II: Development of Postshock Turbulence
John C. Raymond, Jonathan D. Slavin, William P. Blair +3
Radiative shock waves in the Cygnus Loop and other supernova remnants show different morphologies in [O III] and Hα emission. We use HST spectra and narrowband images to study the…
Imagery and UV Spectroscopy of the LMC Supernova Remnant N103B Using HST
William P. Blair, Parviz Ghavamian, John C. Raymond +6
We present HST/WFC3 multiband imagery of N103B, the remnant of a Type Ia supernova in the Large Magellanic Cloud, as well as HST/COS ultraviolet spectroscopy of the brightest radia…
A New Radio Catalogue for M83: Supernova Remnants and H II Regions
Thomas D. Russell, Richard L. White, Knox S. Long +3
We present a new catalogue of radio sources in the face-on spiral galaxy M83. Radio observations taken in 2011, 2015, and 2017 with the Australia Telescope Compact Array (ATCA) at…
Turbulence and Energetic Particles in Radiative Shock Waves in the Cygnus Loop I: Shock Properties
John C. Raymond, Igor V. Chilingarian, William P. Blair +3
We have obtained a contiguous set of long-slit spectra of a shock wave in the Cygnus Loop to investigate its structure, which is far from the morphology predicted by 1D models. Pro…
Kinematics: A Clean Diagnostic for Separating Supernova Remnants from HII Regions in Nearby Galaxies
Sean D. Points, Knox S. Long, P. Frank Winkler +1
Many more supernova remnants (SNRs) are now known in external galaxies than in the Milky Way. Most of these SNRs have been identified using narrow-band imaging, separating SNRs fro…
The Masses of Supernova Remnant Progenitors in M83
Benjamin F. Williams, Tristan J. Hillis, William P. Blair +5
We determine the ages of the young, resolved stellar populations at the locations of 237 optically-identified supernova remnants in M83. These age distributions put constraints on…
The First Metallicity Study of M83 using the integrated UV light of Star Clusters
Svea Hernandez, Søren Larsen, Alessandra Aloisi +8
Stellar populations are powerful tools for investigating the evolution of extragalactic environments. We present the first UV integrated-light spectroscopic observations for 15 you…
MMT Spectroscopy of Supernova Remnant Candidates in M33
Knox S. Long, William P. Blair, Dan Milisavljevic +2
To date, over 220 emission nebulae in M33 have been identified as supernova remnants (SNRs) or SNR candidates, principally through [SII]:Halpha line ratios that are elevated compar…
Forbidden Iron Lines and Dust Destruction in Supernova Remnant Shocks: The Case of N49 in the Large Magellanic Cloud
Michael A. Dopita, Ivo R. Seitenzahl, Ralph S. Sutherland +3
We present results of a complete integral field survey of the bright SNR N49 in the LMC, obtained with the WiFeS instrument mounted on the ANU 2.3m telescope at Siding Spring Obser…
Second Epoch Hubble Space Telescope Observations of Kepler's Supernova Remnant: The Proper Motions of Balmer Filaments
Ravi Sankrit, John C. Raymond, William P. Blair +5
We report on the proper motions of Balmer-dominated filaments in Kepler's supernova remnant using high resolution images obtained with the Hubble Space Telescope at two epochs sepa…
Carbon, Helium and Proton Kinetic Temperatures in a Cygnus Loop Shock Wave
J. C. Raymond, R. J. Edgar, P. Ghavamian +1
Observations of SN1006 have shown that ions and electrons in the plasma behind fast supernova remnant shock waves are far from equilibrium, with the electron temperature much lower…
A Deep XMM-Newton Survey of M33: Point Source Catalog, Source Detection and Characterization of Overlapping Fields
Benjamin F. Williams, Brian Wold, Frank Haberl +9
We have obtained a deep 8-field XMM-Newton mosaic of M33 covering the galaxy out to the D isophote and beyond to a limiting 0.2--4.5 keV unabsorbed flux of 510$^{-16…
A Newly Recognized Very Young Supernova Remnant in M83
William P. Blair, P. Frank Winkler, Knox S. Long +7
As part of a spectroscopic survey of supernova remnant candidates in M83 using the Gemini-South telescope and GMOS, we have discovered one object whose spectrum shows very broad li…
An Expanded HST/WFC3 Survey of M83: Project Overview and Targeted Supernova Remnant Search
William P. Blair, Rupali Chandar, Michael A. Dopita +7
We present an optical/NIR imaging survey of the face-on spiral galaxy M83, using data from the Hubble Space Telescope Wide Field Camera 3 (WFC3). Seven fields are used to cover a l…
A Deep Chandra ACIS Survey of M83
Knox S. Long, Kip D. Kuntz, William P. Blair +5
We have obtained a series of deep X-ray images of the nearby galaxy M83 using Chandra, with a total exposure of 729 ks. Combining the new data with earlier archival observations to…
Spitzer IRS Observations of the XA Region in the Cygnus Loop Supernova Remnant
R. Sankrit, J. C. Raymond, M. Bautista +5
We report on spectra of two positions in the XA region of the Cygnus Loop supernova remnant obtained with the InfraRed Spectrograph on the Spitzer Space Telescope. The spectra span…
Grain Destruction in a Supernova Remnant Shock Wave
John C. Raymond, Parviz Ghavamian, Brian J. Williams +4
Dust grains are sputtered away in the hot gas behind shock fronts in supernova remnants, gradually enriching the gas phase with refractory elements. We have measured emission in C…