Search Publications
What Determines Solar Flares Producing Interplanetary Type III Radio Bursts?
Liu, Y.; Cheng, X.; Ding, M. D. +4 more
Energetic electrons accelerated by solar flares often give rise to type III radio bursts at a broad wave band and even interplanetary type III bursts (IT3) if the wavelength extends to a decameter-kilometer. In this Letter, we investigate the probability of the flares that produce IT3, based on the sample of 2272 flares above M-class observed from…
Magnetic Connectivity between the Light Bridge and Penumbra in a Sunspot
Feng, Song; Nakariakov, Valery M.; Yuan, Ding +2 more
A light bridge is a prominent structure commonly observed within a sunspot. Its presence usually triggers a wealth of dynamics in a sunspot and has a lasting impact on sunspot evolution. However, the fundamental structure of light bridges is still not well understood. In this study, we used the high-resolution spectropolarimetry data obtained by t…
A Multiwavelength Study of PSR J1119-6127 after 2016 Outburst
Takata, J.; Wang, H. -H.; Dai, S. +4 more
The high magnetic field pulsar PSR J1119-6127, detected from radio to high-energy wavelengths, underwent a magnetar-like outburst beginning on 2016 July 27. In this paper, we study the postoutburst multiwavelength properties of this pulsar from the radio to GeV bands and discuss its similarity with the outburst of the magnetar XTE J1810-197. In ph…
Active-region Tilt Angles from White-light Images and Magnetograms: The Role of Magnetic Tongues
Démoulin, Pascal; Mandrini, Cristina H.; Poisson, Mariano +1 more
The presence of elongations in active-region (AR) polarities, called magnetic tongues, is mostly visible during their emergence phase. AR tilts have been measured thoroughly using long-term white-light (WL) databases, sometimes combined with magnetic-field information. Since the influence of magnetic tongues on WL tilt measurements has not been ta…
Distortion of Magnetic Fields in BHR 71
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +9 more
The magnetic field structure of a star-forming Bok globule BHR 71 was determined based on near-infrared polarimetric observations of background stars. The magnetic field in BHR 71 was mapped from 25 stars. By using a simple 2D parabolic function, the plane-of-sky magnetic axis of the core was found to be θmag = 125° ± 11°. The plane-of-…
A Survey for C II Emission-line Stars in the Large Magellanic Cloud
Massey, Philip; Morrell, Nidia; Neugent, Kathryn F. +1 more
We present a narrowband imaging survey of the Large Magellanic Cloud (LMC), designed to isolate the C II λλ7231, 7236 emission lines in objects as faint as mλ7400 ∼ 18. The work is motivated by the recent serendipitous discovery in the LMC of the first confirmed extragalactic [WC11] star, whose spectrum is dominated by C II emission, an…
Time-domain Study of the Young Massive Cluster Westerlund 2 with the Hubble Space Telescope. I
Anderson, J.; Lennon, D. J.; Bastian, N. +8 more
Time-domain studies of pre-main-sequence (PMS) stars have long been used to investigate star properties during their early evolutionary phases and to trace the evolution of circumstellar environments. Historically these studies have been confined to the nearest, low-density, star-forming regions. We used the Wide Field Camera 3 on board the Hubble…
Spinning Bar and a Star-formation Inefficient Repertoire: Turbulence in Hickson Compact Group NGC 7674
Kewley, Lisa J.; Federrath, Christoph; Groves, Brent +2 more
The physics regulating star formation (SF) in Hickson Compact Groups (HCG) has thus far been difficult to describe, due to their unique kinematic properties. In this study, we expand upon previous works to devise a more physically meaningful SF relation able to better encompass the physics of these unique systems. We combine CO(1-0) data from the …
Heliospheric Maps from Cassini INCA Early in the Cruise to Saturn
Mitchell, D. G.; Krimigis, S.; Clark, G. +8 more
We present new energetic neutral atom (ENA) maps from the Ion and Neutral Camera (INCA) instrument on Cassini from the year 2000, prior to Cassini's encounter with Jupiter. These maps are the first produced for the year 2000 and are the only maps with comprehensive spatial coverage from the peak of solar cycle 23. These ENA maps span the energy ra…
Dying of the Light: An X-Ray Fading Cold Quasar at z ∼ 0.405
Kirkpatrick, Allison; Trump, Jonathan R.; LaMassa, Stephanie +11 more
Cold quasars are a rare subpopulation observed to host unobscured, X-ray luminous active galactic nuclei (AGN) while also retaining a cold gas supply fueling high star formation rates. These objects are interpreted as AGN early in their evolution. We present new SOFIA HAWC+ far-infrared observations, far-ultraviolet to far-infrared (FUV-FIR) photo…