Search Publications
The Star-formation-rate-Density Relation at 0.6 < z < 0.9 and the Role of Star-forming Galaxies
Franx, Marijn; Kelson, Daniel D.; Illingworth, Garth D. +2 more
We study the star formation rates (SFRs) of galaxies as a function of local galaxy density at 0.6 < z < 0.9. We used a low-dispersion prism in IMACS on the 6.5 m Baade (Magellan I) telescope to obtain spectra and measured redshifts to a precision of σ z /(1 + z) ~ 1% for galaxies with z AB < 23.3 mag. We utilized a s…
Sublimation temperature of circumstellar dust particles and its importance for dust ring formation
Kimura, Hiroshi; Müller, Sebastian; Kobayashi, Hiroshi +2 more
Dust particles in orbit around a star drift toward the central star by the Poynting-Robertson effect and pile up by sublimation. We analytically derive the pile-up magnitude, adopting a simple model for optical cross sections. As a result, we find that the sublimation temperature of drifting dust particles plays the most important role in the pile…
On the origin of variable gamma-ray emission from the Crab nebula
Lyutikov, M.; Komissarov, S. S.
The oblique geometry of the pulsar wind termination shock ensures that the Doppler beaming has a strong impact on the shock emission. We illustrate this using the recent relativistic magnetohydrodynamic (MHD) simulations of the Crab nebula and the analysis of oblique shocks. We also show that the observed size, shape and distance from the Crab pul…
Orbital observations of contemporary dune activity in Endeavor crater, Meridiani Planum, Mars
Chojnacki, Matthew; Moersch, Jeffrey E.; Michaels, Timothy I. +1 more
Although aeolian landforms are pervasive on Mars, evidence for contemporary activity has been limited. The next major campaign for the Mars Exploration Rover “Opportunity” is the investigation of the ∼20 km diameter Endeavor crater, ∼6 km to southeast of the rover's position as of December 2010. We present evidence from orbital imagery that eight …
The OGLE view of microlensing towards the Magellanic Clouds - III. Ruling out subsolar MACHOs with the OGLE-III LMC data
Soszyński, I.; Udalski, A.; Szymański, M. K. +8 more
In the third part of the series presenting the Optical Gravitational Lensing Experiment (OGLE) microlensing studies of the dark matter halo compact objects (MACHOs), we describe results of the OGLE-III monitoring of the Large Magellanic Cloud (LMC). This unprecedented data set contains almost continuous photometric coverage over 8 years of about 3…
Deep winds beneath Saturn's upper clouds from a seasonal long-lived planetary-scale storm
Phillips, J.; Hueso, R.; Sánchez-Lavega, A. +40 more
Convective storms occur regularly in Saturn's atmosphere. Huge storms known as Great White Spots, which are ten times larger than the regular storms, are rarer and occur about once per Saturnian year (29.5 Earth years). Current models propose that the outbreak of a Great White Spot is due to moist convection induced by water. However, the generati…
Planck early results. XVI. The Planck view of nearby galaxies
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +192 more
The all-sky coverage of the Planck Early Release Compact Source Catalogue (ERCSC) provides an unsurpassed survey of galaxies at submillimetre (submm) wavelengths, representing a major improvement in the numbers of galaxies detected, as well as the range of far-IR/submm wavelengths over which they have been observed. We here present the first resul…
Hubble Space Telescope Paschen α survey of the Galactic Centre: data reduction and products
Calzetti, D.; Morris, M. R.; Wang, Q. D. +7 more
Our Hubble Space Telescope/Near-Infrared Camera and Multi-Object Spectrometer (HST/NICMOS) Paschen α survey of the Galactic Centre, first introduced by Wang et al., provides a uniform, panoramic, high-resolution map of stars and an ionized diffuse gas in the central 416 arcmin2 of the Galaxy. This survey was carried out with 144 HST orb…
AKARI Observation of the Fluctuation of the Near-infrared Background
Lee, H. M.; Jeong, W. -S.; Matsuhara, H. +6 more
We report a search for fluctuations of the sky brightness toward the north ecliptic pole with the Japanese infrared astronomical satellite AKARI, at 2.4, 3.2, and 4.1 µm. We obtained circular maps with 10' diameter fields of view, which clearly show a spatial structure on the scale of a few hundred arcseconds. A power spectrum analysis shows…
Little change in the sizes of the most massive galaxies since z = 1
Smith, G. P.; Burke, C.; Collins, C. A. +2 more
Recent reports suggest that elliptical galaxies have increased their size dramatically over the last ∼8 Gyr. This result points to a major rethink of the processes dominating the late-time evolution of galaxies. In this paper we present the first estimates for the scale sizes of brightest cluster galaxies (BCGs) in the redshift range 0.8 < z &l…