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A Spectroscopic Study of the Rich Supernova Remnant Population in M83
Blair, William P.; Long, Knox S.; Winkler, P. Frank
We report the results from a spectrophotometric study sampling the ≳ 300 candidate supernova remnants (SNRs) in M83 identified through optical imaging with Magellan/IMACS and Hubble Space Telescope/WFC3. Of the 118 candidates identified based on a high [S II] λλ 6716, 6731 to Hα emission ratio, 117 show spectroscopic signatures of shock-heated gas…
Dynamics of Subarcsecond Bright Dots in the Transition Region above Sunspots and Their Relation to Penumbral Micro-jets
Tian, Hui; Banerjee, Dipankar; Samanta, Tanmoy +1 more
Recent high-resolution observations have revealed that subarcsecond bright dots (BDs) with sub-minute lifetimes appear ubiquitously in the transition region (TR) above sunspot penumbra. The presence of penumbral micro-jets (PMJs) in the chromosphere was previously reported. It was proposed that both the PMJs and BDs are formed due to a magnetic re…
An Optical and Infrared Photometric Study of the Young Open Cluster IC 1805 in the Giant H II Region W4 †
Lim, Beomdu; Park, Byeong-Gon; Nazé, Y. +7 more
We present deep wide-field optical CCD photometry and mid-infrared Spitzer/IRAC and MIPS 24 µm data for about 100,000 stars in the young open cluster IC 1805. The members of IC 1805 were selected from their location in the various color-color and color-magnitude diagrams, and the presence of Hα emission, mid-infrared excess emission, and X-r…
An Explanation of Remarkable Emission-line Profiles in Post-flare Coronal Rain
Judge, Philip G.; Donea, Alina; Lacatus, Daniela A.
We study broad redshifted emission in chromospheric and transition region lines that appears to correspond to a form of post-flare coronal rain. Profiles of Mg II, C II, and Si IV lines were obtained using IRIS before, during, and after the X2.1 flare of 2015 March 11 (SOL2015-03-11T16:22). We analyze the profiles of the five transitions of Mg II …
On the Absence of Non-thermal X-Ray Emission around Runaway O Stars
Toalá, J. A.; Oskinova, L. M.; Ignace, R.
Theoretical models predict that the compressed interstellar medium around runaway O stars can produce high-energy non-thermal diffuse emission, in particular, non-thermal X-ray and γ-ray emission. So far, detection of non-thermal X-ray emission was claimed for only one runaway star, AE Aur. We present a search for non-thermal diffuse X-ray emissio…
Dense Gas in the Outer Spiral Arm of M51
Gao, Yu; Koda, Jin; Gu, Qiusheng +2 more
There is a linear relation between the mass of dense gas traced by the HCN(1-0) luminosity and the star formation rate (SFR) traced by the far-infrared luminosity. Recent observations of galactic disks have shown some systematic variations. In order to explore the SFR-dense gas link at high resolution (∼4″, ∼150 pc) in the outer disk of an externa…
3D Polarized Imaging of Coronal Mass Ejections: Chirality of a CME
de Koning, C. A.; Elliott, H. A.; DeForest, C. E.
We report on a direct polarimetric determination of the chirality of a coronal mass ejection (CME), using the physics of Thomson scattering applied to synoptic polarized images from the Solar Terrestrial Relations Observatories/COR2 coronagraph. We confirmed the determination using in situ magnetic field measurements of the same CME with the ACE s…
X-ray study of bow shocks in runaway stars
De Becker, M.; Romero, G. E.; del Valle, M. V. +2 more
Massive runaway stars produce bow shocks through the interaction of their winds with the interstellar medium, with the prospect for particle acceleration by the shocks. These objects are consequently candidates for non-thermal emission. Our aim is to investigate the X-ray emission from these sources. We observed with XMM-Newton a sample of five bo…
A Far-ultraviolet Fluorescent Molecular Hydrogen Emission Map of the Milky Way Galaxy
Edelstein, Jerry; Jo, Young-Soo; Min, Kyoung-Wook +2 more
We present the far-ultraviolet (FUV) fluorescent molecular hydrogen (H2) emission map of the Milky Way Galaxy obtained with FIMS/SPEAR covering ∼76% of the sky. The extinction-corrected intensity of the fluorescent H2 emission has a strong linear correlation with the well-known tracers of the cold interstellar medium (ISM), i…
Synchrotron emission from the blazar PG 1553+113. An analysis of its flux and polarization variability
Lähteenmäki, A.; Giroletti, M.; Villata, M. +59 more
In 2015 July 29-September 1, the satellite XMM-Newton pointed at the BL Lac object PG 1553+133 six times, collecting data for 218 h. During one of these epochs, simultaneous observations by the Swift satellite were requested to compare the results of the X-ray and optical-UV instruments. Optical, near-infrared and radio monitoring was carried out …