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Multi-color, rotationally resolved photometry of asteroid 21 Lutetia from OSIRIS/Rosetta observations
Jorda, L.; Lamy, P. L.; Hviid, S. F. +2 more
Context. Asteroid 21 Lutetia is the second target of the Rosetta space mission. Extensive pre-encounter, space-, and ground-based observations are being performed to prepare for the flyby in July 2010.
Aims: The aim of this article is to accurately characterize the photometric properties of this asteroid over a broad spectral range from the u…
The Herschel revolution: Unveiling the morphology of the high-mass star-formation sites N44 and N63 in the LMC
Bernard, J. -P.; Okumura, K.; Madden, S. C. +21 more
Aims: We study the structure of the medium surrounding sites of high-mass star formation to determine the interrelation between the H ii regions and the environment from which they were formed. The density distribution of the surroundings is key in determining how the radiation of the newly formed stars interacts with the surroundings in a wa…
Dark mammoth trunks in the merging galaxy NGC 1316 and a mechanism of cosmic double helices
Carlqvist, Per
NGC 1316 is a giant, elliptical galaxy containing a complex network of dark, dust features. The morphology of these features has been examined in some detail using a Hubble Space Telescope, Advanced Camera for Surveys image. It is found that most of the features are constituted of long filaments. There also exist a great number of dark structures …
AKARI Infrared Observations of the Edge-On Spiral Galaxy NGC 3079
Onaka, Takashi; Yamagishi, Mitsuyoshi; Kaneda, Hidehiro +3 more
We present AKARI near- to far-infrared images of the nearby edge-on spiral galaxy NGC 3079 in 10 photometric bands. The spectral energy distribution consists of continuum emission from dust with a single temperature of 28-33 K together with strong mid-infrared emission features from polycyclic aromatic hydrocarbons (PAHs). We derived dust masses o…
New views on the emission and structure of the solar transition region
He, Jiansen; Tian, Hui; Marsch, Eckart +2 more
The Sun is the only star that we can spatially resolve and it can be regarded as a fundamental plasma laboratory of astrophysics. The solar transition region (TR), the layer between the solar chromosphere and corona, plays an important role in solar wind origin and coronal heating. Recent high-resolution observations made by SOHO, TRACE, and Hinod…
Hard X-ray timing and spectral characteristics of the energetic pulsar PSR J0205+6449 in supernova remnant 3C 58. An RXTE PCA/HEXTE and XMM-Newton view on the 0.5-250 keV band
Kuiper, L.; Hermsen, W.; den Hartog, P. R. +3 more
Context. PSR J0205+6449 is a young rotation-powered pulsar in SNR 3C 58. It is one of only three young (<10 000 year old) pulsars that have so far been detected in the radio and the classical X-ray bands, as well as at hard X-rays above 20 keV and at high-energy (>100 MeV) γ-rays. The other two young pulsars are the Crab and PSR B1509-58.
Auroral and sub-auroral phenomena: an electrostatic picture
de Keyser, J.; Echim, M.
Many auroral and sub-auroral phenomena are manifestations of an underlying magnetosphere-ionosphere coupling. In the electrostatic perspective the associated auroral current circuit describes how the generator (often in the magnetosphere) is connected to the load (often in the ionosphere) through field-aligned currents. The present paper examines …
Moderate geomagnetic storm (21-22 January 2005) triggered by an outstanding coronal mass ejection viewed via energetic neutral atoms
Barabash, Stas; McKenna-Lawlor, Susan; Dandouras, Iannis +7 more
An outstanding flare on 20 January 2005 was accompanied by a coronal mass ejection which arrived at the magnetopause at ∼1712 UT, 21 January, and produced a strong compression-pressure pulse. Enhanced magnetospheric activity was stimulated. The associated development between <1800 UT and >02.19 UT on 21-22 January, 2005 of a ring current dis…
INTEGRAL/IBIS observations of a hard X-ray outburst in high-mass X-ray binary 4U 2206+54
Wang, W.
Aims: 4U 2206+54 is a wind-fed high-mass X-ray binary with a main-sequence donor star. The nature of its compact object has been recently identified as a slow-pulsation magnetized neutron star.
Methods: INTEGRAL/IBIS observations have a long-term hard X-ray monitoring of 4U 2206+54 and detected a hard X-ray outburst around 15 December 20…
Dynamics of the solar magnetic field from SOHO/MDI
Benevolenskaya, E. E.
The investigation of the dynamics of magnetic fields from small scales to the large scales is very important for the understanding of the nature of solar activity. It is also the base for producing adequate models of the solar cycle with the purpose to predict the level of solar activity. Since December 1995 the Michelson Doppler Imager (MDI) on b…