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Helioseismic Test of Nonhomologous Solar Radius Changes with the 11 Year Activity Cycle
Kosovichev, A. G.; Lefebvre, S.; Rozelot, J. P.
Recent models of variations of the Sun's structure with the 11 year activity cycle by Sofia et al. predict strong nonhomologous changes of the radius of subsurface layers, due to subsurface magnetic fields and field-modulated turbulence. According to their best model, the changes of the surface radius may be 1000 times larger than those at the dep…
Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator
Mori, Hideyuki; Porter, Frederick S.; Kokubun, Motohide +15 more
We observed the bright unidentified TeV γ-ray source HESS J1616-508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1 × 10-13 erg s-1 cm-2 in the 2-10keV band, which is some 60-times below the γ-ray flux in the 1-10TeV band. This object is br…
Thermal and Nonthermal Infrared Emission from M87
Egami, E.; Gordon, K. D.; Rieke, G. H. +2 more
We discuss images of M87 from 3.6 to 160 µm obtained with Spitzer. As found previously, there is an excess in the far-infrared over a simple power-law interpolation from the radio to the resolved nonthermal features in the mid-infrared and optical. We show that this excess is most likely due to warm dust in the galaxy itself and that the pro…
Interplanetary dust detected by the Cassini CDA Chemical Analyser
Postberg, Frank; Altobelli, Nicolas; Grün, Eberhard +7 more
During its cruise phase, prior to encountering Jupiter, the Cosmic Dust Analyser (CDA) onboard the Cassini spacecraft returned time of flight mass spectra (TOF MS) of two interplanetary dust particles. Both particles were found to be iron-rich, with possible traces of hydrogen, carbon, nickel, chromium, manganese, titanium, vanadium and minor sili…
EF Chamaeleontis: Warm Dust Orbiting a Nearby 10 Myr Old Star
Zuckerman, B.; Song, Inseok; Rhee, Joseph H.
Most Vega-like stars have far-infrared excess (60 µm or longward in IRAS, ISO, or Spitzer MIPS bands) and contain cold dust (<~150 K) analogous to the Sun's Kuiper Belt region. However, dust in a region more akin to our asteroid belt and thus relevant to the terrestrial planet building process is warm and produces excess emission in mid-i…
Detection of CO Hot Spots Associated with Young Clusters in the Southern Starburst Galaxy NGC 1365
Ho, Paul T. P.; Mao, Rui-Qing; Matsushita, Satoki +2 more
We have used the Submillimeter Array for the first interferometric CO imaging toward the starburst-Seyfert nucleus of the southern barred spiral galaxy NGC 1365, which is one of the four galaxies within 30 Mpc that have L8-1000µm>=1011 Lsolar. Our mosaic maps of 12CO, 13CO, and C…
A Check for Consistency between Different Magnetic Helicity Measurements Based on the Helicity Conservation Principle
Moon, Yong-Jae; Chae, Jongchul; Lim, Eun-Kyung +1 more
Magnetic helicity is a useful quantity in characterizing the magnetic systems of solar active regions. The purpose of the present work is to check for consistency between the local correlation tracking (LCT) method used to measure helicity injection through the photosphere, and the linear force-free field (LFFF) method used to determine helicity i…
Clustered Star Formation in the Small Magellanic Cloud. A Spitzer/IRAC View of the Star-Forming Region NGC 602/N 90
Henning, Thomas; Gouliermis, Dimitrios A.; Quanz, Sascha P.
We present Spitzer/IRAC photometry on the star-forming H II region N 90, related to the young stellar association NGC 602 in the Small Magellanic Cloud. Our photometry revealed bright mid-infrared sources, which we classify with the use of a scheme based on templates and models of red sources in the Milky Way, and criteria recently developed from …
Properties of UIR Bands in NGC6946 Based on Mid-Infrared Imaging and Spectroscopy with Infrared Camera on Board AKARI
Serjeant, S.; Ohyama, Y.; Takagi, T. +23 more
We present results on mid-infrared imaging and spectroscopic observations of the nearby late-type spiral NGC6946 with the Infrared Camera on board AKARI. Based on mid-infrared imaging with the S7 (7µm may be tools to measure the star-formation activity in remote galaxies if these ratios and their variations are well examined and established …
Propagation and evolution of a magnetic cloud from ACE to Ulysses
Wang, C.; Du, D.; Hu, Q.
The chance of a magnetic cloud (MC) being observed by widely separated spacecraft is rare. However, such an event provides us a good opportunity to study the propagation and evolution of magnetic cloud in the interplanetary space. A magnetic cloud event observed by ACE at Earth on 4-6 March 1998 is tracked from the location of ACE to Ulysses. Usin…