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The Coronal Mass Ejection Waiting-Time Distribution
Wheatland, M. S.
The distribution of times Δt between coronal mass ejections (CMEs) in the Large Angle and Spectrometric Coronagraph (LASCO) CME catalog for the years 1996-2001 is examined. The distribution exhibits a power-law tail ∼(Δt)γ with an index γ≈−2.36±0.11 for large waiting times (Δt>10 hours). The power-law index of the waiting-time distri…
XMM-Newton observations of High Mass X-ray Binaries in the SMC
Pietsch, W.; Haberl, F.; Sasaki, M.
Based on XMM-Newton EPIC data of four pointings towards the Small Magellanic Cloud (SMC), results on timing and spectral analyses of 16 known high mass X-ray binaries (HMXBs) and HMXB candidates in the SMC are presented. We confirm the pulse periods of four sources which were known to show pulsations. In addition, two new X-ray pulsars are discove…
On the source and acceleration of energetic He+: A long-term observation with ACE/SEPICA
Farrugia, C. J.; Galvin, A. B.; Klecker, B. +6 more
We report on a systematic study of the He+/He2+ abundance ratio in the energetic population during the years 1998-2000. For the investigation we have used data in the energy range 0.25-0.8 MeV/n from SEPICA on board ACE and from CELIAS STOF on SOHO in the energy range 0.085-0.28 MeV/q. The ratio is quite variable, with values…
The z=2.51 Extremely Red Submillimeter Galaxy SMM J04431+0210
Ivison, R. J.; Frayer, D. T.; Smail, Ian +4 more
We report the redshift measurement for the submillimeter selected galaxy SMM J04431+0210 (N4) using the Near Infrared Spectrograph on the Keck II Telescope. The data show Hα, [N II] λλ6583, 6548, and [O III] λ5007 lines at a redshift of z=2.51. The high nuclear [N II]/Hα line ratio is consistent with a LINER or type II active galactic nucleus (AGN…
Sympathetic Coronal Mass Ejections
Moon, Y. -J.; Wang, Haimin; Choe, G. S. +1 more
We address the question whether there exist sympathetic coronal mass ejections (CMEs), which take place almost simultaneously in different locations with a certain physical connection. For this study, the following three investigations are performed. First, we have examined the waiting-time distribution of the CMEs that were observed by the SOHO L…
Anatomy of the Herbig-Haro object HH7 bow shock
Smith, Michael D.; Davis, Christopher J.; Khanzadyan, Tigran
We perform a detailed shock diagnosis of the Herbig-Haro object HH7, a well-defined bow shock from a protostellar outflow. We first present molecular hydrogen images in the 2-1 S(1) and 1-0 S(1) K-band emission lines. We then introduce revised models for magneto-hydrodynamic bow shocks that incorporate a limited C and O chemistry and account for t…
X-Ray Observations of the Compact Central Object in Supernova Remnant G347.3-0.5
Gaensler, B. M.; Hughes, J. P.; Galloway, D. K. +4 more
We present Chandra, XMM-Newton, and Rossi X-Ray Timing Explorer observations of 1WGA J1713.4-3949, a compact source at the center of the Galactic supernova remnant (SNR) G347.3-0.5. The X-ray spectrum of the source is well fitted by the sum of a blackbody component with a temperature of ~0.4 keV plus a power-law component with a photon index of ~4…
Searching for Bulges at the End of the Hubble Sequence
Böker, Torsten; van der Marel, Roeland P.; Stanek, Rebecca
We investigate the stellar disk properties of a sample of 19 nearby spiral galaxies with low inclination and late Hubble type (Scd or later). We combine our high-resolution Hubble Space Telescope I-band observations with existing ground-based optical images to obtain surface brightness profiles that cover a high dynamic range of galactic radii. Mo…
Absorption-Line Systems and Galaxies in Front of the Second-brightest Quasar, PHL 1811
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +4 more
The extraordinarily bright quasar PHL 1811, at a redshift zem=0.192, provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the local universe. A short (11.3 ks), exploratory spectrum of this object was obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE) wit…
Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster
van Loon, J. Th.; Eyres, S. P. S.; Evans, A. +3 more
Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instrument ISOPHOT at 60 µm, 70 µm and 90 µm has detected the thermal emission from dust in its core, the first secure detection of intra-cluster dust in a globular cluster. The amount of dust is broadly consistent with mass…