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Gamma-ray continuum emission from the inner Galactic region as observed with INTEGRAL/SPI
Strong, A. W.; Bouchet, L.; Terrier, R. +5 more
The diffuse continuum emission from the Galactic plane in the energy range 18-1000 keV has been studied using 16 Ms of data from the SPI instrument on INTEGRAL. With such an exposure we can exploit the imaging properties of SPI to achieve a good separation of point sources from the various diffuse components. Using a candidate-source catalogue der…
Flow discharge and sediment transport models for estimating a minimum timescale of hydrological activity and channel and delta formation on Mars
Kleinhans, M. G.
This paper summarizes state-of-the-art models for water flow and sediment transport and suggests implications for the sediment grain size distribution, transport process, and delta formation. The flow velocity in Martian outflow channels is commonly calculated from the Manning equation, which is dimensionally incorrect and masks the large uncertai…
The Evolution of Early-Type Red Galaxies with the GEMS Survey: Luminosity-Size and Stellar Mass-Size Relations Since z=1
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +14 more
We combine imaging from the Hubble Space Telescope Advanced Camera for Surveys, as part of the GEMS (Galaxy Evolution from Morphologies and SEDs) survey, with redshifts and rest-frame quantities from COMBO-17 to study the evolution of morphologically early-type galaxies with red colors since z=1. From 0.5d×0.5d imaging, we draw a large sample of 7…
Hubble Space Telescope Advanced Camera for Surveys Coronagraphic Imaging of the AU Microscopii Debris Disk
Ford, H. C.; Demarco, R.; Infante, L. +38 more
We present Hubble Space Telescope Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around the nearby (~10 pc) M dwarf AU Microscopii. The disk is seen between r=0.75" and 15" (7.5-150 AU) from the star. It has a thin midplane with a projected FWHM thickness of 2.5-3.5 AU within r<50 AU o…
Evolution and rotation of large-scale photospheric magnetic fields of the Sun during cycles 21-23. Periodicities, north-south asymmetries and r-mode signatures
Stenflo, J. O.; Berdyugina, S. V.; Knaack, R.
We present the results of an extensive time series analysis of longitudinally-averaged synoptic maps, recorded at the National Solar Observatory (NSO/Kitt Peak) from 1975 to 2003, and provide evidence for a multitude of quasi-periodic oscillations in the photospheric magnetic field of the Sun. In the low frequency range, we have located the source…
A study of the Type II-P supernova 2003gd in M74
Smartt, S. J.; Peletier, R. F.; Kotak, R. +18 more
We present photometric and spectroscopic data of the Type II-P supernova (SN II-P) 2003gd, which was discovered in M74 close to the end of its plateau phase. SN 2003gd is the first Type II supernova (SN) to have a directly confirmed red supergiant (RSG) progenitor. We compare SN 2003gd to SN 1999em, a similar SN II-P, and estimate an explosion dat…
Titan's Magnetic Field Signature During the First Cassini Encounter
Dougherty, Michele K.; Neubauer, Fritz M.; Russell, Christopher T. +8 more
The magnetic field signature obtained by Cassini during its first close encounter with Titan on 26 October 2004 is presented and explained in terms of an advanced model. Titan was inside the saturnian magnetosphere. A magnetic field minimum before closest approach marked Cassini's entry into the magnetic ionopause layer. Cassini then left the nort…
Evidence for Spectropolarimetric Diversity in Type Ia Supernovae
Filippenko, Alexei V.; Foley, Ryan J.; Leonard, Douglas C. +2 more
We present single-epoch, postmaximum spectropolarimetry of four Type Ia supernovae (SNe Ia) that span a range of spectral and photometric properties: SN 2002bf and SN 2004dt exhibit unusually high-velocity (HV) absorption lines. SN 1997dt is probably somewhat subluminous, and SN 2003du is slightly overluminous. We detect polarization modulations a…
The evolution of early-type galaxies at z ∼ 1 from the K20 survey
Cimatti, A.; Daddi, E.; di Serego Alighieri, S. +10 more
We have performed VLT spectroscopy of an almost complete sample of 18 early-type galaxies with 0.88≤ z≤ 1.3 plus two at z=0.67, selected from the K20 survey, and derived the velocity dispersion for 15+2 of them. By combining these data with HST and VLT images, we study the Fundamental Plane (FP), the Faber-Jackson and the Kormendy relations at z ∼…
High-resolution studies of radio sources in the Hubble Deep and Flanking Fields
Muxlow, T. W. B.; Richards, A. M. S.; Wilkinson, P. N. +8 more
18 days of MERLIN data and 42 h of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep Field (HDF). This area also includes the Hubble Flanking Fields (HFF). A complete sample of 92 radio sources with S1.4 > 40 µJy was detected using the VLA data alone and then imaged with the ME…