Search Publications
Coronal mass ejections—Propagation time and associated internal energy
Mujiber Rahman, A.; Manoharan, P. K.
In this paper, we analyze 91 coronal mass ejection (CME) events studied by Manoharan et al. (2004) and Gopalswamy and Xie (2008). These earth-directed CMEs are large (width >160∘) and cover a wide range of speeds (∼120-2400kms-1) in the LASCO field of view. This set of events also includes interacting CMEs and some of them…
Suzaku View of the Supernova Remnant RCW 86: X-Ray Studies of Newly-Discovered Fe-Rich Ejecta
Yamaguchi, Hiroya; Koyama, Katsuji; Uchida, Hiroyuki
We report on results of imaging and spectral analysis of the supernova remnant (SNR) RCW 86 observed with Suzaku. The SNR is known to exhibit K-shell emission of low ionized Fe, possibly originating from supernova ejecta. We revealed the global distribution of the Fe-rich plasma in the entire remnant, for the first time; the Fe-K emission was clea…
The red supergiants and Wolf-Rayet stars of NGC 604
Relaño, Mónica; Eldridge, John J.
We study the post-main-sequence stars in NGC 604, the most luminous H II region in M33. A number of Wolf-Rayet (WR) stars and one red supergiant (RSG) were discovered earlier. Based on the broad-band photometry of the region, we present evidence that is consistent with the presence of this RSG and with three more RSG candidates. Using spectral ene…
Goldschmidt crater and the Moon's north polar region: Results from the Moon Mineralogy Mapper (M3)
Clark, R. N.; Head, J. W.; McCord, T. B. +10 more
Soils within the impact crater Goldschmidt have been identified as spectrally distinct from the local highland material. High spatial and spectral resolution data from the Moon Mineralogy Mapper (M3) on the Chandrayaan-1 orbiter are used to examine the character of Goldschmidt crater in detail. Spectral parameters applied to a north pol…
Modeling of the HerMES Submillimeter Source Lensed by a Dark Matter Dominated Foreground Group of Galaxies
Pérez-Fournon, I.; Rodighiero, G.; Valtchanov, I. +85 more
We present the results of a gravitational lensing analysis of the bright z s = 2.957 submillimeter galaxy (SMG) HERMES found in the Herschel/SPIRE science demonstration phase data from the Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high-resolution imaging available in optical and near-IR channels, along with CO emi…
A Statistical Model for the γ-ray Variability of the Crab Nebula
Yuan, Qiang; Zhang, Bing; Wu, Xue-Feng +3 more
A statistical scenario is proposed to explain the γ-ray variability and flares of the Crab Nebula, which were observed recently by the Fermi/LAT. In this scenario electrons are accelerated in a series of knots, whose sizes follow a power-law distribution. These knots presumably move outward from the pulsar and have a distribution in the Doppler bo…
Violent interaction between the active galactic nucleus and the hot gas in the core of the galaxy cluster Sérsic 159-03
Simionescu, A.; Sun, M.; Allen, S. W. +7 more
We present a multiwavelength study of the energetic interaction between the central active galactic nucleus (AGN), the intracluster medium (ICM) and the optical emission-line nebula in the galaxy cluster Sérsic 159-03. We use X-ray data from Chandra, high-resolution X-ray spectra and ultraviolet (UV) images from XMM-Newton, Hα images from the Sout…
Benchmarking atomic data for astrophysics: Fe xiii EUV lines
Del Zanna, G.
Recent atomic data for Fe xiii are benchmarked against high-resolution spectroscopic observations of the solar corona. All the identifications of the EUV lines are reviewed by also taking into account laboratory measurements. A few new identifications are proposed, and many wavelengths are revised. All the strongest EUV lines are now identified. V…
Evidence of volcanic and glacial activity in Chryse and Acidalia Planitiae, Mars
Mellon, Michael T.; McEwen, Alfred S.; Keszthelyi, Laszlo P. +3 more
Chryse and Acidalia Planitiae show numerous examples of enigmatic landforms previously interpreted to have been influenced by a water/ice-rich geologic history. These landforms include giant polygons bounded by kilometer-scale arcuate troughs, bright pitted mounds, and mesa-like features. To investigate the significance of the last we have analyze…
The brightness of magnetic field concentrations in the quiet Sun
Schnerr, R. S.; Spruit, H. C.
In addition to the "facular" brightening of active regions, the quiet Sun also contains a small scale magnetic field with associated brightenings in continuum radiation. We measure this contribution of quiet regions to the Sun's brightness from high spatial resolution (0.16 arcsec-0.32 arcsec) observations of the Swedish 1-m Solar Telescope (SST) …