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Reexamination of the Infrared Excess-Ultraviolet Slope Relation of Local Galaxies
Inoue, Akio K.; Murata, Katsuhiro L.; Takeuchi, Tsutomu T. +2 more
The relation between the ratio of infrared (IR) and ultraviolet (UV) flux densities (the infrared excess: IRX) and the slope of the UV spectrum (β) of galaxies plays a fundamental role in the evaluation of the dust attenuation of star-forming galaxies, especially at high redshifts. Many authors, however, have pointed out that there is a significan…
Driving Saturn's magnetospheric periodicities from the upper atmosphere/ionosphere
Gombosi, Tamas I.; Kivelson, Margaret G.; Jia, Xianzhe
Saturn's magnetospheric structure and the intensity of radio frequency emissions from its immediate surroundings are modulated at close to the planet's rotation period. Analogous rotation-modulated variations at Jupiter are readily interpreted as effects of the non-axisymmetric intrinsic magnetic field. At Saturn, to the contrary, the high level o…
Spatially resolved observations of warm ionized gas and feedback in local ULIRGs
Clements, D. L.; Bendo, G. J.; Westmoquette, M. S. +1 more
We present Very Large Telescope (VLT)/VIsible MultiObject Spectrograph integral field unit (VIMOS-IFU) emission-line spectroscopy of a volume-limited sample of 18 southern ultraluminous infrared galaxies (ULIRGs) selected with z < 0.09 and δ < 10. By covering a wide range of ULIRG types, including many systems that have received very little …
Detailed abundance analysis from integrated high-dispersion spectroscopy: globular clusters in the Fornax dwarf spheroidal
Larsen, S. S.; Strader, J.; Brodie, J. P.
Aims: We describe our newly developed approach to detailed abundance analysis from integrated-light high-dispersion spectra of star clusters. As a pilot project, we measure abundances of several Fe-peak, α- and neutron capture elements from spectra of three globular clusters (GCs) in the Fornax dwarf spheroidal galaxy, obtained with UVES on t…
Sizing up Lyα and Lyman Break Galaxies
Finkelstein, Steven L.; Hathi, Nimish; Pirzkal, Norbert +4 more
We measure the sizes for a sample of 174 Lyα-selected galaxies with broadband imaging with the Hubble Space Telescope. Over the redshift range 2.25 < z < 6, Lyα-selected galaxies have a characteristic, constant, small size in rest-frame ultraviolet (UV) light. Coupled with a characteristic star formation intensity (i.e., UV luminosity per un…
The Carnegie Hubble Program: The Leavitt Law at 3.6 and 4.5 µm in the Milky Way
Madore, Barry F.; Freedman, Wendy L.; Rigby, Jane R. +4 more
The Carnegie Hubble Program (CHP) is designed to calibrate the extragalactic distance scale using data from the post-cryogenic era of the Spitzer Space Telescope. The ultimate goal of the CHP is a systematic improvement in the distance scale leading to a determination of the Hubble constant to within an accuracy of 2%. This paper focuses on the me…
Field O stars: formed in situ or as runaways?
Gvaramadze, V. V.; Pflamm-Altenburg, J.; Kroupa, P. +1 more
A significant fraction of massive stars in the Milky Way and other galaxies are located far from star clusters and star-forming regions. It is known that some of these stars are runaways, i.e. possess high space velocities (determined through the proper motion and/or radial velocity measurements), and therefore most likely were formed in embedded …
Lower Hybrid Drift Waves: Space Observations
Khotyaintsev, Yuri V.; Vaivads, Andris; André, Mats +1 more
Lower hybrid drift waves (LHDWs) are commonly observed at plasma boundaries in space and laboratory, often having the strongest measured electric fields within these regions. We use data from two of the Cluster satellites (C3 and C4) located in Earth’s magnetotail and separated by a distance of the order of the electron gyroscale. These conditions…
Discovery of bright z ≃ 7 galaxies in the UltraVISTA survey
Taniguchi, Y.; Bowler, R. A. A.; McLure, R. J. +10 more
We have exploited the new, deep, near-infrared UltraVISTA imaging of the Cosmological Evolution Survey (COSMOS) field, in tandem with deep optical and mid-infrared imaging, to conduct a new search for luminous galaxies at redshifts z ≃ 7. The year-one UltraVISTA data provide contiguous Y, J, H, Ks imaging over 1.5 deg2, reach…
Relation Between Coronal Hole Areas on the Sun and the Solar Wind Parameters at 1 AU
Temmer, M.; Veronig, A. M.; Vršnak, B. +1 more
We analyze the relationship between the coronal hole (CH) characteristics on the Sun (area, position, and intensity levels) and the corresponding solar wind parameters (solar wind speed v, proton temperature T, proton density n, and magnetic field strength B) measured in situ at 1 AU with a 6-h time resolution. We developed a histogram-based inten…