Search Publications
Non-Maxwellian Hα Profiles in Tycho's Supernova Remnant
Blair, William P.; Lee, Jae-Joon; Raymond, John C. +2 more
The broad components of the Hα lines in most non-radiative shocks can be fit with single-Gaussian components. We have obtained a high-quality spectrum of a position in Tycho's supernova remnant with the MMT and Blue Channel Spectrograph which shows, for the first time, that a single Gaussian does not provide an acceptable fit. This implies that a …
The effects of star formation on the low-metallicity ISM: NGC 4214 mapped with Herschel/PACS spectroscopy
Poglitsch, A.; Sturm, E.; Okumura, K. +12 more
We present Herschel/PACS spectroscopic maps of the dwarf galaxy NC4214 observed in 6 far infrared fine-structure lines: [C ii] 158 µm, [O iii] 88 µm, [O i] 63 µm, [O i] 146 µm, [N ii] 122 µm, and [N ii] 205 µm. The maps are sampled to the full telescope spatial resolution and reveal unprecedented detail on ~ 150…
The source of widespread 3-µm absorption in Jupiter’s clouds: Constraints from 2000 Cassini VIMS observations
Sromovsky, L. A.; Fry, P. M.
The Cassini flyby of Jupiter in 2000 provided spatially resolved spectra of Jupiter's atmosphere using the Visual and Infrared Mapping Spectrometer (VIMS). A prominent characteristic of these spectra is the presence of a strong absorption at wavelengths from about 2.9 µm to 3.1 µm, previously noticed in a 3-µm spectrum obtained b…
Centrifugal acceleration in the magnetotail lobes
Nilsson, H.; Eriksson, A.; Engwall, E. +2 more
Combined Cluster EFW and EDI measurements have shown that cold ion outflow in the magnetospheric lobes dominates the hydrogen ion outflow from the Earth's atmosphere. The ions have too low kinetic energy to be measurable with particle instruments, at least for the typical spacecraft potential of a sunlit spacecraft in the tenuous lobe plasmas outs…
The environmental dependence of galaxy properties at z = 2
Tanaka, M.; Venemans, B.; De Breuck, C. +1 more
We report on the environmental dependence of galaxy properties at z=2.15. We construct multi-band photometric data sets in the (proto-)cluster PKS1138-26 field and in the GOODS field. We then fit spectral energy distributions of the galaxies with model templates generated with the latest stellar population synthesis code and derive physical proper…
Dust, Ice, and Gas In Time (DIGIT) Herschel program first results. A full PACS-SED scan of the gas line emission in protostar DK Chamaeleontis
Waters, L. B. F. M.; Maret, S.; Güdel, M. +42 more
Aims: We aim to study the composition and energetics of the circumstellar material of DK Cha, an intermediate-mass star in transition from an embedded configuration to a star plus disk stage, during this pivotal stage of its evolution.
Methods: Using the range scan mode of PACS on the Herschel Space Observatory, we obtained a spectrum of…
The Blue Hook Populations of Massive Globular Clusters
Brown, Thomas M.; Hubeny, Ivan; Sweigart, Allen V. +3 more
We present new Hubble Space Telescope ultraviolet color-magnitude diagrams of five massive Galactic globular clusters: NGC 2419, NGC 6273, NGC 6715, NGC 6388, and NGC 6441. These observations were obtained to investigate the "blue hook" (BH) phenomenon previously observed in UV images of the globular clusters ω Cen and NGC 2808. Blue hook stars ar…
Resolved Shock Structure of the Balmer-dominated Filaments in Tycho's Supernova Remnant: Cosmic-ray Precursor?
Blair, William P.; Lee, Jae-Joon; Raymond, John C. +4 more
We report on the results from Hα imaging observations of the eastern limb of Tycho's supernova remnant (SN1572) using the Wide Field Planetary Camera 2 on the Hubble Space Telescope. We resolve the detailed structure of the fast, collisionless shock wave into a delicate structure of nearly edge-on filaments. We find a gradual increase of Hα intens…
Herschel ATLAS: The cosmic star formation history of quasar host galaxies
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +50 more
We present a derivation of the star formation rate per comoving volume of quasar host galaxies, derived from stacking analyses of far-infrared to mm-wave photometry of quasars with redshifts 0 < z < 6 and absolute I-band magnitudes -22 > IAB > -32 We use the science demonstration observations of the first ~16 deg2…
Planetary Magnetic Field Measurements: Missions and Instrumentation
Balogh, André
The nature and diversity of the magnetic properties of the planets have been investigated by a large number of space missions over the past 50 years. It is clear that without the magnetic field measurements that have been carried out in the vicinity of all the planets, the state of their interior and their evolution since their formation would not…