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A Physical Model for SN 2001ay, a Normal, Bright, Extremely Slow Declining Type Ia Supernova
Wang, L.; Baron, E.; Dominguez, I. +5 more
We present a study of the peculiar Type Ia supernova 2001ay (SN 2001ay). The defining features of its peculiarity are high velocity, broad lines, and a fast rising light curve, combined with the slowest known rate of decline. It is one magnitude dimmer than would be predicted from its observed Δm 15, and shows broad spectral features. W…
Timing properties of gamma-ray bursts detected by SPI-ACS detector onboard INTEGRAL
Savchenko, V.; Courvoisier, T. J. -L.; Neronov, A.
Aims: We study timing properties of a large sample of gamma-ray bursts (GRB) detected by the anti-coincidence shield (ACS) of the SPI spectrometer of INTEGRAL telescope.
Methods: We identify GRB-like events in the SPI-ACS data. The data set under investigation is the history of count rate of the SPI-ACS detector recorded with a binning o…
Narrow absorption features in the co-added XMM-Newton RGS spectra of isolated neutron stars
Haberl, F.; Neuhäuser, R.; de Vries, C. P. +2 more
We co-added the available XMM-Newton Reflection Grating Spectrometer (RGS) spectra for each of the isolated X-ray pulsars RX J0720.4-3125, RX J1308.6+2127 (RBS1223), RX J1605.3+3249 and RX J1856.4-3754 (four members of the 'Magnificent Seven') and the 'Three Musketeers' Geminga, PSR B0656+14 and PSR B1055-52. We confirm the detection of a narrow a…
A new automatic method to identify galaxy mergers - I. Description and application to the Space Telescope A901/902 Galaxy Evolution Survey
Bell, Eric F.; Wolf, Christian; Aragón-Salamanca, Alfonso +10 more
We present a new automatic method to identify galaxy mergers using the morphological information contained in the residual images of galaxies after the subtraction of a smooth Sérsic model. The removal of the bulk signal from the host galaxy light is done with the aim of detecting the much fainter and elusive minor mergers. The specific morphologi…
Spectrophotometric investigation of Phobos with the Rosetta OSIRIS-NAC camera and implications for its collisional capture
Sierks, H.; Pajola, M.; Barbieri, C. +11 more
The Martian satellite Phobos has been observed on 2007 February 24 and 25, during the pre- and post-Mars closest approach (CA) of the ESA Rosetta spacecraft Mars swing-by. The goal of the observations was the determination of the surface composition of different areas of Phobos, in order to obtain new clues regarding its nature and origin. Near-ul…
Direct observations of the formation of the solar wind halo from the strahl
Fazakerley, A. N.; Gurgiolo, C.; Goldstein, M. L. +1 more
Observations of a continual erosion of the strahl and build up of the halo with distance from the sun suggests that, at least in part, the halo may be formed as a result of scattering of the strahl. This hypothesis is supported in this paper by observation of intense scattering of strahl electrons, which gives rise to a proto-halo electron populat…
What influence will future solar activity changes over the 21st century have on projected global near-surface temperature changes?
Lockwood, Mike; Jones, Gareth S.; Stott, Peter A.
During the 20th century, solar activity increased in magnitude to a so-called grand maximum. It is probable that this high level of solar activity is at or near its end. It is of great interest whether any future reduction in solar activity could have a significant impact on climate that could partially offset the projected anthropogenic warming. …
Atomic oxygen distributions in the Venus thermosphere: Comparisons between Venus Express observations and global model simulations
Gérard, J. -C.; Soret, L.; Brecht, A. S. +1 more
Nightglow emissions provide insight into the global thermospheric circulation, specifically in the transition region (∼70-120 km). The O 2 IR nightglow statistical map created from Venus Express (VEx) Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS) observations has been used to deduce a three-dimensional atomic oxygen density…
Shape and orientation of the gas distribution in A1689
Ettori, S.; Baldi, A.; Sereno, M.
Knowledge of intrinsic shape and orientation of galaxy clusters is crucial to understand their formation and evolution. We propose a novel model which uses Bayesian inference to determine the intrinsic form of the hot intracluster medium of galaxy clusters. The method exploits X-ray spectroscopic and photometric data plus measurements of the Sunya…
Large-scale Star-formation-driven Outflows at 1 < z < 2 in the 3D-HST Survey
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +18 more
We present evidence of large-scale outflows from three low-mass (log(M */M ⊙) ~ 9.75) star-forming (SFR > 4 M ⊙ yr-1) galaxies observed at z = 1.24, z = 1.35, and z = 1.75 in the 3D-HST Survey. Each of these galaxies is located within a projected physical distance of 60 kpc around the sight line to th…