Search Publications
Molecular Environments of 51 Planck Cold Clumps in the Orion Complex
Liu, Tie; Wu, Yuefang; Zhang, Huawei
A mapping survey of 51 Planck cold clumps projected on the Orion complex was performed with J = 1-0 lines of 12CO and 13CO with the 13.7 m telescope at the Purple Mountain Observatory. The mean column densities of the Planck gas clumps range from 0.5 to 9.5 × 1021 cm-2, with an average value of (2.9 ± 1.…
Asymmetry in the current sheet and secondary magnetic flux ropes during guide field magnetic reconnection
Fujimoto, M.; Zhang, Tielong; Khotyaintsev, Yuri V. +15 more
A magnetic reconnection event with a moderate guide field encountered by Cluster in the near-Earth tail on 28 August 2002 is reported. The guide field points dawnward during this event. The quadrupolar structure of the Hall magnetic field within the ion diffusion region is distorted toward the northern hemisphere in the earthward part while toward…
PacMan returns: An electron-generated thermal anomaly on Tethys
Spencer, J. R.; Howett, C. J. A.; Segura, M. +2 more
New Cassini observations show that Saturn’s moon Tethys, like Mimas, has a region of anomalously high thermal inertia at low latitudes centered on its leading hemisphere. Derivation of the thermophysical properties of the surface across three representative regions indicate that the bolometric Bond albedo across Tethys’ leading hemisphere remains …
High-resolution X-Ray Spectroscopy of the Galactic Supernova Remnant Puppis A with XMM-Newton/RGS
Katsuda, Satoru; Petre, Robert; Uchida, Hiroyuki +6 more
We present high-resolution X-ray spectra of cloud-shock interaction regions in the eastern and northern rims of the Galactic supernova remnant Puppis A, using the Reflection Grating Spectrometer on board the XMM-Newton satellite. A number of emission lines including Kα triplets of He-like N, O, and Ne are clearly resolved for the first time. Inten…
Buildup and Release of Magnetic Twist during the X3.4 Solar Flare of 2006 December 13
Choe, G. S.; Shiota, D.; Inoue, S. +3 more
We analyze the temporal evolution of the three-dimensional magnetic structure of the flaring active region (AR) NOAA 10930 by using the nonlinear force-free fields extrapolated from the photospheric vector magnetic fields observed by the Solar Optical Telescope on board Hinode. This AR consisted mainly of two types of twisted magnetic field lines:…
A Study of Heating and Cooling of the ISM in NGC 1097 with Herschel-PACS and Spitzer-IRS
Helou, G.; Roussel, H.; Murphy, E. J. +38 more
NGC 1097 is a nearby Seyfert 1 galaxy with a bright circumnuclear starburst ring, a strong large-scale bar, and an active nucleus. We present a detailed study of the spatial variation of the far-infrared (FIR) [C II]158 µm and [O I]63 µm lines and mid-infrared H2 emission lines as tracers of gas cooling, and of the polycycli…
An insight in the surroundings of HR 4796
Ehrenreich, D.; Milli, J.; Lacour, S. +8 more
Context. HR 4796 is a young, early A-type star harboring a well structured debris disk, shaped as a ring with sharp inner edges. The inner edge might be shaped by a yet unseen planet inside the ring; the outer one is not well understood. The star forms together with the M-type star HR 4796B, a binary system, with a projected separation of ≃ 560 AU…
Detection of Flux Emergence, Splitting, Merging, and Cancellation of Network Field. I. Splitting and Merging
Hagenaar, H. J.; Iida, Y.; Yokoyama, T.
Frequencies of magnetic patch processes on the supergranule boundary, namely, flux emergence, splitting, merging, and cancellation, are investigated through automatic detection. We use a set of line-of-sight magnetograms taken by the Solar Optical Telescope (SOT) on board the Hinode satellite. We found 1636 positive patches and 1637 negative patch…
Spitzer Search for Dust Disks around Central Stars of Planetary Nebulae
De Marco, Orsola; Chu, You-Hua; Bilíková, Jana +2 more
Two types of dust disks have been discovered around white dwarfs (WDs): small dust disks within the Roche limits of their WDs and large dust disks around hot WDs extending to radial distances of 10-102 AU. The majority of the latter WDs are central stars of planetary nebulae (CSPNs). We have therefore used archival Spitzer Infrared Arra…
AKARI Near-infrared Spectroscopy of Luminous Infrared Galaxies
Lee, Myung Gyoon; Lee, Jong Chul; Hwang, Ho Seong +2 more
We present the AKARI near-infrared (NIR; 2.5-5 µm) spectroscopic study of 36 (ultra)luminous infrared galaxies ((U)LIRGs) at z = 0.01-0.4. We measure the NIR spectral features including the strengths of 3.3 µm polycyclic aromatic hydrocarbon emission and hydrogen recombination lines (Brα and Brβ), optical depths at 3.1 and 3.4 µm…