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The Host Galaxy and the Extended Emission-Line Region of the Radio Galaxy 3C 79
Fu, Hai; Stockton, Alan
We present extensive ground-based spectroscopy and HST imaging of 3C 79, an FR II radio galaxy associated with a luminous extended emission-line region (EELR). Surface brightness modeling of an emission-line-free HST R-band image reveals that the host galaxy is a massive elliptical with a compact companion 0.8'' away and 4 mag fainter. …
Galaxy Clusters in the IRAC Dark Field. I. Growth of the Red Sequence
Surace, J. A.; Yan, L.; Krick, J. E. +4 more
Using three newly identified galaxy clusters at z ~ 1 (photometric redshift) we measure the evolution of the galaxies within clusters from high redshift to the present day by studying the growth of the red cluster sequence. The clusters are located in the Spitzer Infrared Array Camera (IRAC) Dark Field, an extremely deep mid-infrared survey near t…
Redshifted emission lines and radiative recombination continuum from the Wolf-Rayet binary θ Muscae: evidence for a triplet system?
Maeda, Y.; Tsuboi, Y.; Sugawara, Y.
We present XMM-Newton observations of the WC binary θ Muscae (WR 48), the second brightest Wolf-Rayet binary in optical wavelengths. The system consists of a short-period (19.1375 days) WC5/WC6 + O6/O7V binary and possibly has an additional O supergiant companion (O9.5/B0Iab) which is optically identified at a separation of ~46 mas. Strong emissio…
Cluster observations of collisionless Hall reconnection at high-latitude magnetopause
Balogh, A.; Zhang, H.; Zong, Q. -G. +6 more
The first in situ observation of collisionless Hall reconnection in the high-latitude region when the interplanetary magnetic field (IMF) By dominates is reported in this paper. On 23 March 2002, Cluster crossed the magnetopause current sheet when it traveled outbound in the Northern Hemisphere. The interface between the cusp and the ma…
Faint super-soft X-ray sources in XMM-Newton Large Magellanic Cloud fields
Haberl, F.; Kahabka, P.; Pakull, M. +4 more
Aims: We report the discovery of three faint, super-soft X-ray sources in LMC fields observed with XMM-Newton.
Methods: We analyse the three new sources together with RX J0537.7-7034 and RX J0507.1-6743, both known since ROSAT.
Results: We identify XMMU J050803.1-684017 with the LMC planetary nebula LHA 120-N 102 = LMC SMP 29. The EPIC-pn …
Dust haze in Valles Marineris observed by HRSC and OMEGA on board Mars Express
Bibring, J. -P.; Poulet, F.; Bellucci, G. +9 more
We present analysis of a bright haze observed inside Valles Marineris, which formed in mid northern spring. The data were collected by the High Resolution Stereo Camera (HRSC) and the imaging spectrometer, Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA), aboard Mars Express. This study provides a case example of the power…
Mass unloading along the inner edge of the Enceladus plasma torus
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +4 more
A major discovery made by the Cassini spacecraft at Saturn was the substantial mass ejection from the south pole of Enceladus. Previous studies show that this ejected gas can become ionized and subsequently load mass onto the connecting magnetic field lines near the moon. Radial diffusion then allows the mass-loaded field lines to move outward to …
Galaxy Clusters at 0.9 < z < 1.7 in the AKARI NEP Deep Field
Goto, Tomotsugu; Inami, Hanae; Nakagawa, Takao +11 more
There is ahuge gap between the properties of red-sequence selected massive galaxy clusters at z < 1 and Lyman-break selected proto-clusters at z > 3. It is important to understand when and how the z > 3 proto-clusters evolve into passive clusters at z < 1. We aim to fill this cluster desert by using space-based N4 (4 µm) imaging …
The Intermediate Polar EI UMa: A Prepolar Cataclysmic Variable
Mukai, Koji; Ringwald, F. A.; Welsh, William F. +1 more
We present optical and X-ray time series photometry of EI UMa that reveal modulation at 746 and 770 s, which we interpret as the white dwarf spin and spin-orbit sidebands. These detections, combined with previous X-ray studies, establish EI UMa as an intermediate polar. We estimate the mass accretion rate to be ~3.6 × 1017 g s-1
Modeling UX Ursae Majoris: An Abundance of Challenges
Szkody, Paula; Sion, Edward M.; Godon, Patrick +2 more
We present a system model for optical and far-UV spectra of the nova-like variable UX UMa involving a white dwarf, secondary star, gas stream, hot spot, and accretion disk using our code BINSYN and based on an initially adopted system distance. Calculated SED intensity data successfully fit successive tomographically extracted annuli longward of t…