Search Publications
Improved models for cosmic infrared background anisotropies: new constraints on the infrared galaxy population
Knox, Lloyd; Oh, S. Peng; Shang, Cien +1 more
The power spectrum of cosmic infrared background (CIB) anisotropies is sensitive to the connection between star formation and dark matter haloes over the entire cosmic star formation history. Here we develop a model that associates star-forming galaxies with dark matter haloes and their subhaloes. The model is based on a parametrized relation betw…
The enigmatic nature of the circumstellar envelope and bow shock surrounding Betelgeuse as revealed by Herschel. I. Evidence of clumps, multiple arcs, and a linear bar-like structure
Blommaert, J. A. D. L.; Gomez, H. L.; Barlow, M. J. +13 more
Context. The interaction between stellar winds and the interstellar medium (ISM) can create complex bow shocks. The photometers on board the Herschel Space Observatory are ideally suited to studying the morphologies of these bow shocks.
Aims: We aim to study the circumstellar environment and wind-ISM interaction of the nearest red supergiant,…
Applications of a new set of methane line parameters to the modeling of Titan’s spectrum in the 1.58 µm window
Drossart, Pierre; Bézard, Bruno; Lellouch, Emmanuel +11 more
In this paper we apply a recently released set of methane line parameters (Wang et al., 2011) to the modeling of Titan spectra in the 1.58 µm window at both low and high spectral resolution. We first compare the methane absorption based on this new set of methane data to that calculated from the methane absorption coefficients derived in sit…
Precision simulation of ground-based lensing data using observations from space
Leauthaud, Alexie; Rhodes, Jason; Mandelbaum, Rachel +2 more
Current and upcoming wide-field, ground-based, broad-band imaging surveys promise to address a wide range of outstanding problems in galaxy formation and cosmology. Several such uses of ground-based data, especially weak gravitational lensing, require highly precise measurements of galaxy image statistics with careful correction for the effects of…
Are Nuclear Star Clusters the Precursors of Massive Black Holes?
Neumayer, Nadine; Walcher, C. Jakob
We present new upper limits for black hole masses in extremely late type spiral galaxies. We confirm that this class of galaxies has black holes with masses less than 10^6 Msolar, if any. We also derive new upper limits for nuclear star cluster (NC) masses in massive galaxies with previously determined black hole masses. We use the newly derived u…
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…