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Bulk Comptonization of the Cosmic Microwave Background by Extragalactic Jets as a Probe of Their Matter Content
Georganopoulos, Markos; Kazanas, Demosthenes; Perlman, Eric +1 more
We propose a method for estimating the composition, i.e., the relative amounts of leptons and protons, of extragalactic jets that exhibit X-ray-bright knots in their kiloparsec-scale jets. The method relies on measuring, or setting upper limits on, the component of the cosmic microwave background (CMB) radiation that is bulk Comptonized (BC) by co…
A slow coronal mass ejection with rising X-ray source
Mandrini, C. H.; van Driel-Gesztelyi, L.; Harra, L. K. +2 more
An eruptive event, which occurred on 16th April 2002, is discussed. Using images from the Transition Region and Coronal Explorer (TRACE) at 195 Å, we observe a lifting flux rope which gives rise to a slow coronal mass ejection (CME). There are supporting velocity observations from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliosph…
The X-ray spectrum of NGC 7213 and the Seyfert-LINER connection
Page, M. J.; Branduardi-Raymont, G.; Soria, R. +3 more
We present an XMM-Newton observation of the Seyfert-LINER (low-ionization nuclear emission-line region) galaxy NGC 7213. The RGS soft X-ray spectrum is well fitted with a power law plus soft X-ray collisionally ionized thermal plasma (kT= 0.18+0.03-0.01 keV). We confirm the presence of FeI, FeXXV and FeXXVI Kα emission in the…
Search for 17 µm H2 Pure Rotational Emission from Circumstellar Disks
Onaka, T.; Kataza, H.; Sako, S. +5 more
We report the negative detection of the S(1) pure rotational line emission of molecular hydrogen at 17.035 µm for four young stars, HD 163296, MWC 863, CQ Tau, and LkCa 15, for which Infrared Space Observatory (ISO) observations detected the S(1) emission, with the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the 8.2 m Subaru Tele…
Two Sympathetic Homologous CMEs on 2002 May 22
Ding, Ming-De; Fang, Cheng; Cheng, Jian-Xia +1 more
Sympathetic coronal mass ejections (CMEs) usually occur in different active regions connected by interconnecting magnetic loops, while homologous CMEs occur within the same active region with an almost the same background magnetic field, and so are similar in shapes. Two sympathetic CMEs erupted within 3 hours on 2002 May 22, originating from the …
XMM-Newton surveys of the Canada-France Redshift Survey Fields - III. The environments of X-ray selected active galactic nuclei at 0.4 < z < 0.6
Lilly, S.; McCracken, H. J.; Eales, S. A. +3 more
The environmental properties of a sample of 31 hard X-ray selected active galactic nuclei (AGN) are investigated, from scales of 500 kpc down to 30 kpc, and are compared to a control sample of inactive galaxies. All the AGN lie in the redshift range 0.4 < z < 0.6. The accretion luminosity density of the Universe peaks close to this redshift …
Study of Hα Macrospicules in Coronal Holes: Magnetic Structure and Evolution in Relation to Photospheric Magnetic Setting
Wang, H.; Moore, R. L.; Jiang, Y. +2 more
Small-scale solar dynamic events such as spicules, macrospicules, and microflares may play an important role in the coronal heating and solar wind acceleration in coronal holes. In these regions, the network fields concentrated along edges of supergranules are probably the source of the fine-scale activity that may drive the heating and accelerati…
Coronal mass ejection kinematics deduced from white light (Solar Mass Ejection Imager) and radio (Wind/WAVES) observations
Webb, D. F.; Kaiser, M. L.; Jackson, B. V. +3 more
White-light and radio observations are combined to deduce the coronal and interplanetary kinematics of a fast coronal mass ejection (CME) that was ejected from the Sun at about 1700 UT on 2 November 2003. The CME, which was associated with an X8.3 solar flare from W56°, was observed by the Mauna Loa and Solar and Heliospheric Observatory (SOHO) La…
Cosmic-ray diffusion in the inner heliosphere
McKibben, R. B.
For about the last 40 years, we have been trying to understand the propagation of cosmic rays and other energetic charged particles through the interplanetary medium. Identification of the basic processes affecting the propagation, namely diffusion, convection by the solar wind, adiabatic deceleration, and gradient and curvature drifts, was attain…
State Transition and Flaring Activity of IGR J17464-3213/H1743-322 with INTEGRAL SPI
Capitanio, F.; Ubertini, P.; Malzac, J. +4 more
IGR J17464-3213, already known as the HEAO 1 transient source H1743-322, has been detected during a state transition by INTEGRAL SPI. We describe the spectral evolution and flaring activity of IGR J17464-3213/H1743-322 from 2003 March 21 to 2003 April 22. During the first part, the source followed a continuous spectral softening, with the peak of …