Search Publications
Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31
Gilbert, Karoline M.; van der Marel, Roeland P.; Sohn, Sangmo Tony +6 more
We present the line-of-sight (LOS) velocities for 13 distant main sequence Milky Way halo stars with published proper motions (PMs). The PMs were measured using long baseline (5-7 years) multi-epoch Hubble Space Telescope/Advanced Camera for Surveys photometry, and the LOS velocities were extracted from deep (5-6 hr integrations) Keck II/DEIMOS sp…
X-Ray Observations of Bow Shocks around Runaway O Stars. The Case of ζ Oph and BD+43°3654
Pohl, M.; Guerrero, M. A.; Toalá, J. A. +3 more
Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations toward the runaway stars ζ Oph by Chandra and Suzaku and of BD+43°3654 by XMM-Newton to search for the presence of non-thermal X-ray emission. We found no evidence of non-thermal emission spatially coincident w…
Slipping Magnetic Reconnection of Flux-rope Structures as a Precursor to an Eruptive X-class Solar Flare
Hou, Yijun; Li, Ting; Zhang, Jun +1 more
We present the quasi-periodic slipping motion of flux-rope structures prior to the onset of an eruptive X-class flare on 2015 March 11, obtained by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory. The slipping motion occurred at the north part of the flux rope and seemed to successively peel off the flux rope. The spee…
Characterizing the Youngest Herschel-detected Protostars. II. Molecular Outflows from the Millimeter and the Far-infrared
Manoj, P.; Wyrowski, Friedrich; Fischer, William J. +7 more
We present Combined Array for Research in Millimeter-wave Astronomy (CARMA) CO (J=1\to 0) observations and Herschel PACS spectroscopy, characterizing the outflow properties toward extremely young and deeply embedded protostars in the Orion molecular clouds. The sample comprises a subset of the Orion protostars known as the PACS Bright Red Sources …
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…
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…
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…
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…
Compositional Similarities and Distinctions between Titan’s Evaporitic Terrains
Barnes, Jason W.; MacKenzie, S. M.
We document the similarities in composition between the equatorial basins Tui Regio, Hotei Regio, and other 5-µm-bright materials, notably the north polar evaporites, by investigating the presence and extent of an absorption feature at 4.92 µm. In most observations, Woytchugga Lacuna, Ontario Lacus, MacKay Lacus, deposits near Fensal, …