Search Publications
Missions
Journals
Publication Years
The sub-Parker spiral structure of the heliospheric magnetic field
McComas, D. J.; Schwadron, N. A.
Recent studies have shown that the heliospheric magnetic field can be much more radial than the standard Parker spiral in the rarefactions of co-rotation interaction regions (CIRs). This effect can be explained by the motion of open magnetic field foot points at the Sun across the coronal hole boundary. Such motion causes magnetic field lines to b…
Cl 1205+44: A Fossil Group at z = 0.59
Romer, A. K.; Adami, C.; Durret, F. +6 more
This is a report of Chandra, XMM-Newton, Hubble Space Telescope, and Astrophysical Research Consortium telescope observations of an extended X-ray source at z=0.59. The apparent member galaxies range from spiral to elliptical, and are all relatively red (i'-Ks about 3). We interpret this object to be a fossil group based on t…
High spatial resolution mid-infrared spectroscopy of NGC 5253: The stellar content of the embedded super-star cluster
Schaerer, D.; Sauvage, M.; Martín-Hernández, N. L.
We present the N-band (8-13 µm) spectrum of the hidden compact radio super-star cluster in NGC 5253, C2, obtained with TIMMI2 on the ESO 3.6 m telescope. The spectrum is characterised by a rising continuum due to warm dust, a silicate absorption and a strong [S IV] line at 10.5 µm. Weaker lines of [Ar II]I at 9.0 µm and [Ne II] a…
Observational evidence of the primary role played by photospheric motions in magnetic helicity transport before a filament eruption
Romano, P.; Contarino, L.; Zuccarello, F.
Many filament eruptions can be suitably described in the framework of the kink instability model, although it is not always easy to discriminate whether the helical flux rope writhes due to new emerging flux or to photospheric horizontal motions. In this paper we provide observational evidence of the important role which can be played by horizonta…
Cluster at the Magnetospheric Cusps
Escoubet, C. P.; Lavraud, B.; Owen, C. J. +9 more
Merging Galaxies in GOODS-S: First Extragalactic Results from Keck Laser Adaptive Optics
Koo, D. C.; Le Mignant, D.; Wright, S. A. +15 more
The Center for Adaptive Optics Treasury Survey aims to combine deep Hubble Space Telescope (HST) images in the optical with deep Keck adaptive optics (AO) data in the near-infrared (NIR) to study distant galaxies, active galactic nuclei, and supernovae. We recently achieved an important new milestone by securing the first Keck laser guide star AO …
Protostars, Dust Globules, and a Herbig-Haro Object in the LMC Superbubble N51D
Gruendl, R. A.; Smith, R. C.; Gordon, K. D. +9 more
Using Spitzer Space Telescope and Hubble Space Telescope observations of the superbubble N51D, we have identified three young stellar objects (YSOs) in dust globules and made the first detection of a Herbig-Haro object outside the Galaxy. The spectral energy distributions of these YSOs suggest young massive stars with disk, envelope, and outflow c…
XMM-Newton Observations of the M31 Northern Disk: Properties of Selected X-Ray Sources and Unresolved Emission
Mason, Keith; Trudolyubov, Sergey; Kotov, Oleg +2 more
We present the results of an XMM-Newton survey of the northern part of M31 disk. The X-ray properties of the 37 brightest sources are studied in detail. Combining the results of X-ray analysis with available data at other wavelengths, we were able to identify 19 out of 37 sources. Two sources in our sample were previously unknown: the hard X-ray s…
Probing Multiple Sight Lines through the SN 1006 Remnant by Ultraviolet Absorption Spectroscopy
Long, Knox S.; Fesen, Robert A.; Winkler, P. Frank +1 more
Absorption-line spectroscopy is an effective probe for cold ejecta within a supernova remnant (SNR), provided that suitable background UV sources can be identified. For the SN 1006 remnant we have identified four such sources, in addition to the much-studied Schweitzer-Middleditch (SM) star. We have used STIS on the Hubble Space Telescope to obtai…
Flows in the solar atmosphere due to the eruptions on the 15th July, 2002
Mandrini, C. H.; van Driel-Gesztelyi, L.; Culhane, J. L. +4 more
Which kind of flows are present during flares? Are they compatible with the present understanding of energy release and which model best describes the observations? We analyze successive flare events in order to answer these questions. The flares were observed in the magnetically complex NOAA active region (AR) 10030 on 15 July 2002. One of them i…