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Have we detected the most luminous ULX so far?
Cappi, M.; Ponti, G.; Fabian, A. C. +4 more
We report the XMM-Newton detection of a moderately bright X-ray source (F0.5-7 ~ 8.2 × 10-14ergcm-2s-1) superimposed on the outer arms of the inactive spiral galaxy MCG-03-34-63 (z = 0.0213). It is clearly offset from the nucleus (by about 19 arcsec) but well within the D25 ellipse of the gala…
NGC 7419: a young open cluster with a number of very young intermediate mass pre-MS stars
Mathew, Blesson; Subramaniam, Annapurni; Ramya, S. +1 more
We present a photometric and spectroscopic study of the young open cluster NGC 7419, which is known to host a large number of classical Be stars for reasons not well understood. Based on CCD photometric observations of 327 stars in UBV passbands, we estimated the cluster parameters as, reddening [E(B - V)] = 1.65 +/- 0.15 mag and distance = 2900 +…
The Spatial Distribution of Faint Fuzzy Star Clusters in NGC 5195
Hwang, Narae; Lee, Myung Gyoon
We present a study of a faint fuzzy star cluster system in the nearby SB0 galaxy NGC 5195 interacting with the famous spiral galaxy NGC 5194 (M51), based on HST ACS BVI mosaic images taken by the Hubble Heritage Team. We have found about 50 faint fuzzy star clusters around NGC 5195 that are larger than typical globular clusters with effective radi…
FUSE Spectroscopy of the White Dwarf in U Geminorum
Brammer, Gabriel; Long, Knox S.; Froning, Cynthia S.
Observations of U Gem with FUSE confirm that the WD is heated by the outburst and cools during quiescence. At the end of an outburst, the best uniform-temperature WD model fits to the data indicate a temperature of 41,000-47,000 K, while in midquiescence, the temperature is 28,000-31,000 K, depending on the gravity assumed for the WD. Photospheric…
The GLE on Oct. 28, 2003 - radio diagnostics of relativistic electron and proton injection
Mann, G.; Aurass, H.; Warmuth, A. +1 more
Timing discrepancies between signatures of accelerated particles at the sun and the arrival times of the particles at near-earth detectors are a matter of fundamental interest for space-weather applications. The solar injection times of various components of energetic particles were derived by Klassen et al. (2005, JGR, 110, A09S04) for the Octobe…
An XMM-Newton survey of broad iron lines in AGN
Nandra, K.; Turner, T. J.; Reeves, J. N. +2 more
We report on the iron Kα line properties of a sample of Seyfert galaxies observed with the XMM-Newton EPIC pn instrument. Using a systematic and uniform analysis, we find that complexity at iron-K is extremely common in the XMM-Newton spectra. Once appropriate soft X-ray absorption, narrow 6.4 keV emission and associated Compton reflection are acc…
Interaction of the Solar Wind with Weak Obstacles: Hybrid Simulations for Weakly Active Comets and for Mars
Kührt, E.; Motschmann, U.
Obstacles in the solar wind are weak when their extension is small or comparable to the characteristic ion gyroradii. In this case interactions involve kinetic features, and hybrid models are an adequate description. A hybrid code operating on a curvilinear 3D grid and its application to solar wind interaction with weak obstacles is discussed. The…
The globular cluster mass/low mass X-ray binary correlation: implications for kick velocity distributions from supernovae
Maccarone, T. J.; Kundu, A.; Zepf, S. E. +1 more
Optical and X-ray studies of six nearby galaxies show that the probability a globular cluster will be an X-ray source is consistent with being linearly proportional to its mass. We show that this result is consistent with some recent estimates of the velocity kick distributions for isolated radio pulsars - those which are the sum of two Maxwellian…
Two-phase X-ray burst from GX 3+1 observed by INTEGRAL
Frontera, F.; Lund, N.; in't Zand, J. J. M. +6 more
INTEGRAL detected on August 31, 2004, an unusual thermonuclear X-ray burst from the low-mass X-ray binary GX 3+1. Its duration was 30 min, which is between the normal burst durations for this source (⪉10 s) and the superburst observed in 1998 (several hours). We see emission up to 30 keV energy during the first few seconds of the burst where the b…
Active Region Detection and Verification With the Solar Feature Catalogue
Zharkova, V. V.; Ipson, S.; Zharkov, S. +1 more
We describe the automated extraction of active regions (ARs) or plages from the European Grid of Solar Observations (EGSO) Solar Feature Catalogue using a region-growing technique. In this work, Hα and Ca II K3 solar images from the Meudon Observatory and EUV solar images from the SOHO/EIT instrument were used. For better detection accuracy, the s…