Search Publications
Detection of X-rays from the Symbiotic Star V1329 Cyg
Sokoloski, Jennifer L.; Stute, Matthias; Luna, Gerardo J. M.
We report the detection of X-ray emission from the symbiotic star V1329 Cyg with XMM-Newton. The spectrum from the EPIC pn, MOS1, and MOS2 instruments consists of a two-temperature plasma with k T 1 = 0.11+0.02 -0.02 keV and k T 2 = 0.93+0.12 -0.14 keV. Unlike the vast majority of s…
The red giant branch in the Tycho-2 catalogue
Gontcharov, G. A.
Based on multicolor photometry from the 2MASS and Tycho-2 catalogues, we have produced a sample of 38 368 branch red giants that has less than 1% of admixtures and is complete within 500 pc of the Sun. The sample includes 30 671 K giants, 7544Mgiants, 49 C giants, and 104 suspected supergiants or S stars. The photometric distances have been calcul…
Cassini Plasma Spectrometer and hybrid model study on Titan's interaction: Effect of oxygen ions
Kallio, E.; Janhunen, P.; Crary, F. +7 more
During the Cassini Titan flyby on 2 July 2006 (T15), Titan was surrounded by a magnetospheric plasma flow with density about 0.1 cm-3 as measured by Cassini Plasma Spectrometer (CAPS). A very low fraction of water group ions (O+) was detected in the flow dominated by hydrogen ions. We show that Titan's plasma interaction can …
A Suzaku Observation of MCG -2-58-22: Constraining the Geometry of the Circumnuclear Material
Rivers, Elizabeth; Markowitz, Alex; Rothschild, Richard
We have analyzed a long-look Suzaku observation of the active galactic nucleus MCG -2-58-22, a type 1.5 Seyfert with very little X-ray absorption in the line of sight and prominent features arising from reflection off circumnuclear material: the Fe line and Compton reflection hump. We place tight constraints on the power-law photon index (Γ = 1.80…
The Correlation between the Magnetic and Velocity Fields on the Full Solar Disk
Zhang, H. Q.; Zhao, M. Y.; Wang, X. F.
A possible correlation between the magnetic and velocity fields has been analyzed based on the SOHO/MDI magnetograms and Dopplergrams. It is found that the observed large-scale weak magnetic field (weaker than 50 G (gauss)) is correlated with the velocity statistically. The curves of u⋅b with latitude, where u and b are the velocity and magnetic f…
Updated Analysis of the Upwind Interplanetary Hydrogen Velocity as Observed by the Hubble Space Telescope during Solar Cycle 23
Harris, Walter M.; Ben-Jaffel, Lotfi; Vincent, Frédéric E.
The interplanetary hydrogen (IPH), a population of neutrals that fill the space between planets inside the heliosphere, carries the signature of the interstellar medium (ISM) and the heliospheric interface. As the incoming ISM-ionized component deflects at the heliopause, charge exchange reactions decelerate the bulk motion of the neutrals that pe…
Confirmation of IGR J01363+6610 as a Be X-ray Binary with Very Low Quiescent X-ray Luminosity
Kaaret, Philip; Heinke, Craig; Bodaghee, Arash +4 more
The field containing the candidate High Mass X-ray Binary IGR J01363+6610 was observed by XMM-Newton on 2009 July 31 for 28 ks. A Be star was previously suggested as the possible counterpart of the INTEGRAL source, and although Chandra, during a 2007 observation, did not detect an X-ray source at the position of the Be star, we find a variable sou…
Cross-correlation between the cosmic microwave and infrared backgrounds for integrated Sachs-Wolfe detection
Lagache, Guilaine; Douspis, Marian; Ilić, Stéphane +2 more
We investigate the cross-correlation between the cosmic infrared background (CIB) and cosmic microwave background (CMB) anisotropies due to the integrated Sachs-Wolfe (ISW) effect. We first describe the CIB anisotropies using a linearly biased power spectrum, valid on the angular scales of interest. From this, we derive the theoretical angular pow…
On large plasmoid formation in a global magnetohydrodynamic simulation
Janhunen, P.; Palmroth, M.; Honkonen, I. +2 more
We investigate plasmoid formation in the magnetotail using the global magnetohydrodynamic (MHD) simulation GUMICS-4. Here a plasmoid implies a major reconfiguration of the magnetotail where a part of the tail plasma sheet is ejected downstream, in contrast to small Earthward-propagating plasmoids. We define a plasmoid based solely on the structure…
Searching for the 511 keV annihilation line from galactic compact objects with the IBIS gamma ray telescope
De Cesare, G.
Context. The first detection of a gamma ray line with an energy of about 500 keV from the center of our Galaxy dates back to the early seventies. Thanks to the astrophysical application of high spectral resolution detectors, it was soon clear that this radiation was due to the 511 keV photons generated by electron-positron annihilation. Even thoug…