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A Hubble Space Telescope Treasury Study of Star-forming Regions in the Local Group. II. Young Stellar Populations in M31
Bianchi, Luciana; Hodge, Paul; Kang, Yongbeom +1 more
We studied the young stellar populations of 22 star-forming regions in the Andromeda galaxy (M31), with Hubble Space Telescope (HST) multi-band imaging from far-UV to I. The regions were selected from Galaxy Evolution Explorer (GALEX) wide-field far-UV imaging; they sample different environments and galactocentric distances from 6 to 22 kpc. They …
A time-variable, phase-dependent emission line in the X-ray spectrum of the isolated neutron star RX J0822-4300
Caraveo, P. A.; Bignami, G. F.; Tiengo, A. +9 more
RX J0822-4300 is the central compact object associated with the Puppis A supernova remnant. Previous X-ray observations suggested RX J0822-4300 to be a young neutron star with a weak dipole field and a peculiar surface temperature distribution dominated by two antipodal spots with different temperatures and sizes. An emission line at 0.8 keV was a…
12 Years of X-Ray Variability in M31 Globular Clusters, Including 8 Black Hole Candidates, as Seen by Chandra
Murray, S. S.; Barnard, R.; Garcia, M.
We examined 134 Chandra observations of the population of X-ray sources associated with globular clusters (GCs) in the central region of M31. These are expected to be X-ray binary systems (XBs), consisting of a neutron star or black hole accreting material from a close companion. We created long-term light curves for these sources, correcting for …
Suzaku X-Ray Follow-up Observations of Seven Unassociated Fermi-LAT Gamma-Ray Sources at High Galactic Latitudes
Cheung, C. C.; Guillemot, L.; Kataoka, J. +8 more
We report on our second-year campaign of X-ray follow-up observations of unidentified Fermi Large Area Telescope (LAT) γ-ray sources at high Galactic latitudes (|b| > 10°) using the X-ray Imaging Spectrometer on board the Suzaku X-ray Observatory. In this second year of the project, seven new targets were selected from the First Fermi-LAT Catal…
A statistical study of energy release and transport midway between the magnetic reconnection and initial dipolarization regions in the near-Earth magnetotail associated with substorm expansion onsets
Paterson, W. R.; Miyashita, Y.; Saito, Y. +3 more
Our previous study showed that the energy release associated with substorm expansion onsets is the most significant midway between the magnetic reconnection and initial dipolarization regions (-12 > X > -18 RE in the premidnight sector) in the magnetotail. In the present paper, we have statistically studied the substorm-associated…
Bow shock and magnetopause contributions to the magnetospheric current system: Hints from the Cluster observations
Wang, C.; Tang, B. B.; Guo, X. C.
We perform a statistical study of the surface current at the high-latitude magnetopause (HLMP) and the bow shock under different southward interplanetary magnetic field (IMF) conditions, taking advantage of the crossing events of these discontinuities by the Cluster spacecraft. With an enhancement of southward IMF BZ, the surface curren…
Search for X-Ray Emission Associated with the Shapley Supercluster with Suzaku
Kelley, Richard L.; Sato, Kosuke; Ohashi, Takaya +6 more
Suzaku performed observations of 3 regions in and around the Shapley supercluster, a region located between A 3558 and A 3556, at
Discovery of a Compact Companion to the Hot Subdwarf Star BD +37° 442
Mereghetti, Sandro; Esposito, Paolo; Tiengo, Andrea +1 more
We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD +37° 442 carried out with the XMM-Newton satellite in 2011 August. X-ray emission is detected with a flux of about 3× 10-14 erg cm-2 s-1 (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody wi…
Multi-wavelength Spectroscopic Observation of Extreme-ultraviolet Jet in AR 10960
Kitagawa, N.; Yokoyama, T.; Imada, S. +1 more
We have studied the relationship between the velocity and temperature of a solar EUV jet. The highly accelerated jet occurred in the active region NOAA 10960 on 2007 June 5. Multi-wavelength spectral observations with EIS/Hinode allow us to investigate Doppler velocities at a wide temperature range. We analyzed the three-dimensional angle of the j…
Rotation period of Venus estimated from Venus Express VIRTIS images and Magellan altimetry
Erard, S.; Drossart, P.; Piccioni, G. +2 more
The 1.02 µm wavelength thermal emission of the nightside of Venus is strongly anti-correlated to the elevation of the surface. The VIRTIS instrument on Venus Express has mapped this emission and therefore gives evidence for the orientation of Venus between 2006 and 2008. The Magellan mission provided a global altimetry data set recorded betw…