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Radio Diagnostics of Electron Acceleration Sites During the Eruption of a Flux Rope in the Solar Corona
Gallagher, Peter T.; Carley, Eoin P.; Vilmer, Nicole
Electron acceleration in the solar corona is often associated with flares and the eruption of twisted magnetic structures known as flux ropes. However, the locations and mechanisms of such particle acceleration during the flare and eruption are still subject to much investigation. Observing the exact sites of particle acceleration can help confirm…
Abnormal oscillation modes in a waning light bridge
Walsh, Robert W.; Yuan, Ding
Context. A sunspot acts as a waveguide in response to the dynamics of the solar interior; the trapped waves and oscillations could reveal its thermal and magnetic structures.
Aims: We study the oscillations in a sunspot intruded by a light bridge, and the details of these oscillations could reveal the fine structure of the magnetic topology. …
A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar
Hallinan, G.; Laurent, P.; Moran, P. +4 more
We report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubble Space Telescope, Advanced Camera for Surveys and the International Gamma-Ray Astrophysics Laboratory satellite (INTEGRAL). These, when combined with other optical pola…
The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud
van Loon, J. Th.; Olofsson, H.; Sahai, R. +21 more
Context. Low- and intermediate-mass stars lose most of their stellar mass at the end of their lives on the asymptotic giant branch (AGB). Determining gas and dust mass-loss rates (MLRs) is important in quantifying the contribution of evolved stars to the enrichment of the interstellar medium.
Aims: This study attempts to spectrally resolve CO…
The PDS 66 Circumstellar Disk as Seen in Polarized Light with the Gemini Planet Imager
Schneider, Glenn; Duchêne, Gaspard; Dong, Ruobing +25 more
We present H- and K-band imaging polarimetry for the PDS 66 circumstellar disk obtained during the commissioning of the Gemini Planet Imager (GPI). Polarization images reveal a clear detection of the disk in to the 0.″12 inner working angle (IWA) in the H band, almost three times closer to the star than the previous Hubble Space Telescope (HST) ob…
In-situ measurements of Saturn's dusty rings based on dust impact signals detected by Cassini RPWS
Gurnett, D. A.; Kurth, W. S.; Ye, S. -Y.
The Cassini Radio and Plasma Wave Science (RPWS) instrument can detect dust particles when voltage pulses induced by the dust impacts are observed in the wideband receiver. The size of the voltage pulse is proportional to the mass of the impacting dust particle. In this paper, we show RPWS measurements of dust particles in Saturn's dusty rings. Th…
The Spectacular Radio-near-IR-X-Ray Jet of 3C 111: The X-Ray Emission Mechanism and Jet Kinematics
Perlman, Eric S.; Clautice, Devon; Cara, Mihai +6 more
Relativistic jets are the most energetic manifestation of the active galactic nucleus (AGN) phenomenon. AGN jets are observed from the radio through gamma-rays and carry copious amounts of matter and energy from the sub-parsec central regions out to the kiloparsec and often megaparsec scale galaxy and cluster environs. While most spatially resolve…
Carbon gas in SMC low-metallicity star-forming regions
Stutzki, J.; Zinnecker, H.; Okada, Y. +5 more
This paper presents [ CII ], [ CI ] and CO emission line maps of the star-forming regions N 66, N 25+N 26, and N 88 in the metal-poor Local Group dwarf galaxy SMC. The spatial and velocity structure of the large HII region N 66 reveals an expanding ring of shocked molecular gas centered on the exciting star cluster NGC 346, whereas a more distant …
Constraining the ISM Properties of the Cloverleaf Quasar Host Galaxy with Herschel Spectroscopy
Maloney, Philip R.; Uzgil, Bade D.; Bradford, C. Matt +2 more
We present Herschel observations of the far-infrared (FIR) fine-structure (FS) lines [C II]158 µm, [O I]63 µm, [O III]52 µm, and [Si II]35 µm in the z = 2.56 Cloverleaf quasar, and combine them with published data in an analysis of the dense interstellar medium (ISM) in this system. Observed [C II]158 µm, [O I]63 &mic…
Infrared Supernova Remnants and their Infrared-to-X-ray Flux Ratios
Jeong, Il-Gyo; Seok, Ji Yeon; Koo, Bon-Chul +2 more
Recent high-resolution infrared space missions have revealed supernova remnants (SNRs) of diverse morphology in infrared (IR) dust emission that are often very different from their X-ray appearance. The observed range of infrared-to-X-ray (IRX) flux ratios of SNRs is also wide. For a sample of 20 Galactic SNRs, we obtain their IR and X-ray propert…