Search Publications
The Significance of the Influence of the CME Deflection in Interplanetary Space on the CME Arrival at Earth
Wang, Yuming; Shen, Chenglong; Zhuang, Bin +5 more
As one of the most violent astrophysical phenomena, coronal mass ejections (CMEs) have strong potential space weather effects. However, not all Earth-directed CMEs encounter the Earth and produce geo-effects. One reason is the deflected propagation of CMEs in interplanetary space. Although there have been several case studies clearly showing such …
Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
Giavalisco, Mauro; Kirkpatrick, Allison; Zavala, Jorge A. +32 more
We directly detect dust emission in an optically detected, multiply imaged galaxy lensed by the Frontier Fields cluster MACSJ0717.5+3745. We detect two images of the same galaxy at 1.1 mm with the AzTEC camera on the Large Millimeter Telescope leaving no ambiguity in the counterpart identification. This galaxy, MACS0717_Az9, is at z > 4 and the…
The Origin of [C II] 157 µm Emission in a Five-component Interstellar Medium: The Case of NGC 3184 and NGC 628
Armus, L.; Hunt, L. K.; Smith, J. D. +13 more
With its relatively low ionization potential, C+ can be found throughout the interstellar medium (ISM) and provides one of the main cooling channels of the ISM via the [C II] 157 µm emission. While the strength of the [C II] line correlates with the star formation rate, the contributions of the various gas phases to the [C II] emi…
The Causes of Quasi-homologous CMEs
Temmer, M.; Veronig, A. M.; Wang, Yuming +8 more
In this paper, we identified the magnetic source locations of 142 quasi-homologous (QH) coronal mass ejections (CMEs), of which 121 are from solar cycle (SC) 23 and 21 from SC 24. Among those CMEs, 63% originated from the same source location as their predecessor (defined as S-type), while 37% originated from a different location within the same a…
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 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…