Search Publications
Quasi-periodic Slipping Magnetic Reconnection During an X-class Solar Flare Observed by the Solar Dynamics Observatory and Interface Region Imaging Spectrograph
Li, Ting; Zhang, Jun
We first report the quasi-periodic slipping motion of flare loops during an eruptive X-class flare on 2014 September 10. The slipping motion was investigated at a specific location along one of the two ribbons and can be observed throughout the impulsive phase of the flare. The apparent slipping velocity was 20-110 km s-1, and the assoc…
Dust Continuum Emission as a Tracer of Gas Mass in Galaxies
Calzetti, Daniela; Schinnerer, Eva; Walter, Fabian +8 more
We use a sample of 36 galaxies from the KINGFISH (Herschel IR), HERACLES (IRAM CO), and THINGS (Very Large Array H I) surveys to study empirical relations between Herschel infrared (IR) luminosities and the total mass of the interstellar gas (H2 + H I). Such a comparison provides a simple empirical relationship without introducing the u…
The Sloan Lens ACS Survey. XII. Extending Strong Lensing to Lower Masses
Treu, Tommaso; Brownstein, Joel R.; Gavazzi, Raphaël +8 more
We present observational results from a new Hubble Space Telescope (HST) Snapshot program to extend the methods of the Sloan Lens ACS (SLACS) Survey to lower lens-galaxy masses. We discover 40 new galaxy-scale strong lenses, which we supplement with 58 previously discovered SLACS lenses. In addition, we determine the posterior PDFs of the Einstein…
A High-Resolution Hubble Space Telescope Study of Apparent Lyman Continuum Leakers at z~3
Reddy, N. A.; Shapley, A. E.; Siana, B. +3 more
We present U336V606J125H160 follow-up Hubble Space Telescope (HST) observations of 16 z ∼ 3 candidate Lyman continuum (LyC) emitters in the HS1549+1919 field. With these data, we obtain high spatial-resolution photometric redshifts of all sub-arcsecond components of the LyC candidates in order to elimina…
Modeling Thermal Dust Emission with Two Components: Application to the Planck High Frequency Instrument Maps
Meisner, Aaron M.; Finkbeiner, Douglas P.
We apply the Finkbeiner et al. two-component thermal dust emission model to the Planck High Frequency Instrument maps. This parameterization of the far-infrared dust spectrum as the sum of two modified blackbodies (MBBs) serves as an important alternative to the commonly adopted single-MBB dust emission model. Analyzing the joint Planck/DIRBE dust…
Circumsolar Energetic Particle Distribution on 2011 November 3
Lario, D.; Rodríguez-Pacheco, J.; Gómez-Herrero, R. +7 more
Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based on the analysis of in situ plasma and particle observations, their correlation with remote sensing observations, and an interplanetary transport model, we conclude that the particle increases observed at multiple…
Resonant Absorption of Transverse Oscillations and Associated Heating in a Solar Prominence. I. Observational Aspects
Van Doorsselaere, Tom; Antolin, Patrick; De Pontieu, Bart +3 more
Transverse magnetohydrodynamic waves have been shown to be ubiquitous in the solar atmosphere and can, in principle, carry sufficient energy to generate and maintain the Sun’s million-degree outer atmosphere or corona. However, direct evidence of the dissipation process of these waves and subsequent heating has not yet been directly observed. Here…
The 2014 March 29 X-flare: Subarcsecond Resolution Observations of Fe XXI λ1354.1
Jaeggli, Sarah; Tian, Hui; Young, Peter R.
The Interface Region Imaging Spectrometer (IRIS) is the first solar instrument to observe ~10 MK plasma at subarcsecond spatial resolution through imaging spectroscopy of the Fe XXI λ1354.1 forbidden line. IRIS observations of the X1 class flare that occurred on 2014 March 29 at 17:48 UT reveal Fe XXI emission from both the flare ribbons and the p…
The Complex Accretion Geometry of GX 339-4 as Seen by NuSTAR and Swift
Harrison, F. A.; Stern, D.; Zhang, W. W. +19 more
We present spectral analyses of five Nuclear Spectroscopic Telescope Array and Swift observations of GX 339-4 taken during a failed outburst during the summer of 2013. These observations cover Eddington luminosity fractions in the range ≈0.9%-6%. Throughout this outburst GX 339-4 stayed in the hard state and all five observations show similar X-ra…
X-Ray and Radio Emission from Type IIn Supernova SN 2010jl
Chandra, Poonam; Fransson, Claes; Chevalier, Roger A. +2 more
We present all X-ray and radio observations of the Type IIn supernova SN 2010jl. The X-ray observations cover a period up to day 1500 with Chandra, XMM-Newton, NuSTAR, and Swift-X-ray Telescope (XRT). The Chandra observations after 2012 June, the XMM-Newton observation in 2013 November, and most of the Swift-XRT observations until 2014 December ar…