Search Publications
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…
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, …
Tracing the Chromospheric and Coronal Magnetic Field with AIA, IRIS, IBIS, and ROSA Data
Aschwanden, Markus J.; Reardon, Kevin; Jess, Dave B.
The aim of this study is to explore the suitability of chromospheric images for magnetic modeling of active regions. We use high-resolution images (≈ 0\buildrel{\prime\prime}\over{.} 2{--}0\buildrel{\prime\prime}\over{.} 3), from the Interferometric Bidimensional Spectrometer in the Ca II 8542 Å line, the Rapid Oscillations in the Solar Atmosphere…
A Study of the Relation between Star Formation and Molecular Clumps on Subparsec Scales in 30 Doradus
Panagia, N.; Indebetouw, R.; Sabbi, E. +4 more
We present 12CO and 13CO molecular gas data observed by ALMA, massive early-stage young stellar objects (YSOs) identified by applying color-magnitude cuts to Spitzer and Herschel photometry, and low-mass late-stage YSOs identified via {{H}}α excess. Using dendrograms, we derive properties for the molecular cloud structures. T…
Physical properties of CO-dark molecular gas traced by C+
Wang, Shen; Heiles, Carl; Li, Di +3 more
Context. Neither Hi nor CO emission can reveal a significant quantity of so-called dark gas in the interstellar medium (ISM). It is considered that CO-dark molecular gas (DMG), the molecular gas with no or weak CO emission, dominates dark gas. Determination of physical properties of DMG is critical for understanding ISM evolution. Previous studies…