Science Archives Publication System

The First Direct Detection of a Gravitational µ-Lens toward the Galactic Bulge

DOI: 10.1086/522563 Bibcode: 2007ApJ...671..420K

Kozłowski, S.; Mao, S.; Woźniak, P. R. +1 more

We present a direct detection of the gravitational lens that caused the microlensing event MACHO-95-BLG-37. This is the first fully resolved microlensing system involving a source in the Galactic bulge, and the second such system in general. The lens and source are clearly resolved in images taken with the High Resolution Channel of the Advanced C…

2007 • The Astrophysical Journal

eHST 28

Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope

DOI: 10.1086/509567 Bibcode: 2007ApJ...655..396H

Fegan, S. J.; Fortin, P.; Horan, D. +56 more

Gamma-ray burst (GRB) observations at very high energies (VHE; E>100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE component similar to that seen in blazars and plerions, in which the GRB spectral energy distribution has a double-peaked shape extending into the VHE regime. VHE emission co…

2007 • The Astrophysical Journal

INTEGRAL 28

Detection of broad 21-cm absorption at z_abs = 0.656 in the complex sight-line towards 3C336

DOI: 10.1111/j.1745-3933.2007.00354.x Bibcode: 2007MNRAS.381L...6C

Webb, J. K.; Tzanavaris, P.; Murphy, M. T. +2 more

We report the detection of 21-cm absorption at z_abs = 0.656 towards 1622 + 238 (3C336). The line is very broad with a full width to half-maximum of 235 km s^-1, giving a velocity-integrated optical depth of . The centroid of the line is offset from that of the known damped Lyman α absorption system (DLA) by 50 km s^-1

2007 • Monthly Notices of the Royal Astronomical Society

eHST 27

A statistical study of wave propagation in coronal holes

DOI: 10.1051/0004-6361:20065592 Bibcode: 2007A&A...463..713O

Doyle, J. G.; Banerjee, D.; O'Shea, E.

Aims:To find evidence for propagating magnetoacoustic waves in equatorial and polar coronal hole locations.
Methods: Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in radiant flux and velocity measurements from transition region (O V 629) and coronal lines (Mg X 624, Si XII 520). …

2007 • Astronomy and Astrophysics

SOHO 27

On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter

DOI: 10.1051/0004-6361:20077295 Bibcode: 2007A&A...474..983L

Motch, C.; Smith, M. A.; Torrejón, J. M. +2 more

HD 110432 is the first proposed, and best studied, member of a growing group of Be stars with X-ray properties similar to γ Cas. These stars exhibit hard-thermal X-rays that are variable on all measurable timescales. This emission contrasts with the soft emission of “normal" massive stars and with the non-ther…

2007 • Astronomy and Astrophysics

XMM-Newton 27

IGR J00234+6141: a new INTEGRAL source identified as an intermediate polar

DOI: 10.1051/0004-6361:20077877 Bibcode: 2007A&A...473..185B

de Martino, D.; Masetti, N.; Bonnet-Bidaud, J. M. +2 more

Context: Following an extensive survey of the galactic plane by the INTEGRAL satellite, new hard X-ray sources are discovered with a significant fraction of Cataclysmic Variables (CVs) among them.
Aims: We report here the identification of one of these hard X-ray sources, IGR J00234+6141, as an accreting magnetic white dwarf of intermediate po…

2007 • Astronomy and Astrophysics

INTEGRAL 27

Magnetosheath plasma expansion: Hybrid simulations

DOI: 10.1029/2007GL029728 Bibcode: 2007GeoRL..3415104T

Hellinger, Petr; Dandouras, Iannis; Escoubet, C. Philippe +3 more

We investigate the effect of slow expansion on a magnetosheath plasma and low-frequency waves using a two-dimensional hybrid expanding box simulation. We start our simulation with a homogeneous high beta plasma, which is marginally stable to the mirror and proton cyclotron instabilities. The expansion is imposed as an external force: the physical …

2007 • Geophysical Research Letters

Cluster 27

Jets from young stars

DOI: 10.1007/s10509-007-9531-7 Bibcode: 2007Ap&SS.311...15B

Bally, John

Most stars produce spectacular jets during their formation. There are thousands of young stars within 500 pc of the Sun and many power jets. Thus protostellar jets may be the most common type of collimated astrophysical outflow. Shocks powered by outflows excite many emission lines, exhibit a rich variety of structure, and motions with velocities …

2007 • Astrophysics and Space Science

eHST 27

Near-Infrared Polarimetry of the Eagle Nebula (M 16)

DOI: 10.1093/pasj/59.3.507 Bibcode: 2007PASJ...59..507S

Tamura, Motohide; Hashimoto, Jun; Kusakabe, Nobuhiko +10 more

We carried out deep and wide (∼ 8 × 8) JHK_s imaging polarimetry in the southern region of the Eagle Nebula (M 16). The polarization intensity map reveals that two YSOs with near-IR reflection nebulae are located at the tips of two famous molecular pillars (Pillars 1 and 2) facing toward the exciting stars of M 16. The centrosymmetric po…

2007 • Publications of the Astronomical Society of Japan

eHST 27

Hard X-Ray Intensity Distribution along Hα Ribbons

DOI: 10.1086/520812 Bibcode: 2007ApJ...664L.127J

Liu, Chang; Jing, Ju; Wang, Haimin +2 more

Unusual ribbon-like hard X-ray sources were found with the RHESSI observation of a 2B/M8.0 flare on 2005 May 13. We use this unique observation to investigate the spatial distribution of the hard X-ray intensity along the ribbons and compare it with the local magnetic reconnection rate and energy release rate predicted by the standard magnetic rec…

2007 • The Astrophysical Journal

SOHO 27