Search Publications
Suzaku X-Ray and Optical Spectroscopic Observations of SS 433 in the 2006 April Multiwavelength Campaign
Makishima, Kazuo; Ueda, Yoshihiro; Yamada, Shin'ya +9 more
We report on results of the 2006 April multiwavelength campaign of SS 433, focusing on X-ray data observed with Suzaku at two orbital phases (in- and out-of-eclipse phases) and on simultaneous optical spectroscopic observations. Analyzing the FeXXV Kα lines originating from the jets, we detected a rapid variability of the Doppler shifts, dz/dt ≈ 0…
Backscattered solar wind protons by Phobos
Fedorov, A.; Barabash, S.; Lundin, R. +5 more
We report Mars Express (MEX) measurements showing that the regolith-covered Phobos surface backscatters 0.5%-10% of the impinging solar wind protons. Backscattered protons with an energy corresponding to 30%-40% of the solar wind energy injected in the flow are picked up by the solar wind and may cause field disturbances and wave activity. Since a…
Star Cluster Candidates in M81
Brodie, Jean P.; Nantais, Julie B.; Huchra, John P. +2 more
We present a catalog of extended objects in the vicinity of M81 based on a set of 24 Hubble Space Telescope Advanced Camera for Surveys Wide Field Camera F814W (I-band) images. We have found 233 good globular cluster (GC) candidates; 92 candidate H II regions, OB associations, or diffuse open clusters; 489 probable background galaxies; and 1719 un…
Gradual Inflation of Active-region Coronal Arcades Building up to Coronal Mass Ejections
Liu, Chang; Wang, Haimin; Liu, Rui +1 more
The pre-coronal mass ejection (pre-CME) structure is of great importance to understanding the origin of CMEs, which, however, has been largely unknown for CMEs originating from active regions. In this paper, we investigate this issue using the wavelet-enhanced EUV Imaging Telescope (EIT) observations combined with the Large Angle and Spectrometric…
Structure and Dynamics of Quiescent Filament Channels Observed by Hinode/XRT and STEREO/EUVI
Golub, Leon; van Ballegooijen, Adriaan; Su, Yingna
We present a study of the structure and dynamics of quiescent filament channels observed by Hinode/XRT and STEREO/EUVI at the solar minimum 23/24 from 2006 November to 2008 December. For 12 channels identified on the solar disk (Group I channels), we find that the morphology of the structure on the two sides of the channel is asymmetric in both X-…
Magnetic and spectroscopic properties of supergranular-scale coronal jets and erupting loops in a polar coronal hole
Tu, C. -Y.; Marsch, E.; Curdt, W. +4 more
Context. Coronal jets and mass ejections associated with erupting loops are two distinct and frequently observed types of transient upflows of plasma in coronal holes (CHs). But the magnetic and spectroscopic properties of these events at the supergranular scale are not well known.
Aims: Here we aim at studying in a polar hole the plasma and …
Hinode Observation of Photospheric Magnetic Activities Triggering X-ray Microflares Around a Well-developed Sunspot
Kano, R.; Shimizu, T.; Tarbell, T. D.
Microflares, which are small energetic events in the solar corona, are an example of dynamical phenomena suitable for understanding energy release processes in the solar corona. We identified 55 microflares around a well-developed sunspot surrounded by a moat with high-cadence X-ray images from the Hinode X-ray Telescope, and searched for their ph…
Multiband Nonthermal Radiative Properties of HESS J1813-178
Fang, Jun; Zhang, Li
The source HESS J1813-178 was detected in a survey of the inner Galaxy in TeV γ-rays, and a composite supernova remnant (SNR) G12.8-0.0 was identified in the radio band to be associated with it. The pulsar wind nebula (PWN) embedded in the SNR is powered by an energetic pulsar PSR J1813-1749, which was recently discovered. Whether the TeV γ-rays o…
A New 626 s periodic X-ray source in the direction of the Galactic center
Farrell, S. A.; Webb, N. A.; Barret, D. +4 more
Aims: Here we report the detection of a 626 s periodic modulation from the X-ray source 2XMM J174016.0-290337 located in the direction of the Galactic center.
Methods: We present temporal and spectral analyses of archival XMM-Newton data and photometry of archived near-infrared data in order to investigate the nature of this source.
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Study of a homogeneous QSO sample: relations between the QSO and its host galaxy
Magain, P.; Letawe, G.; Letawe, Y.
We analyse a sample of 69 quasi-stellar objects (QSOs) which have been randomly selected in a complete sample of 104 QSOs (R <= 18,0.142 < z < 0.198,δ < 10°). 60 have been observed with the NTT/SUSI2 at La Silla, through two filters in the optical band (WB 655 and V 812), and the remaining nine are taken from archive data bases. The fi…