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Recovery of surface reflectance spectra and evaluation of the optical depth of aerosols in the near-IR using a Monte Carlo approach: Application to the OMEGA observations of high-latitude regions of Mars
Bibring, J. -P.; Gondet, B.; Langevin, Y. +2 more
We present a model of radiative transfer through atmospheric particles based on Monte Carlo methods. This model can be used to analyze and remove the contribution of aerosols in remote sensing observations. We have developed a method to quantify the contribution of atmospheric dust in near-IR spectra of the Martian surface obtained by the OMEGA im…
Supermassive black holes in the Sbc spiral galaxies NGC 3310, NGC 4303 and NGC 4258
Marconi, A.; Capetti, A.; Carollo, C. M. +12 more
We have undertaken an HST Space Telescope Imaging Spectrograph survey of 54 late type spiral galaxies to study the scaling relations between black holes and their host spheroids at the low mass end. Our aim is to measure black hole masses or to set upper limits for a sizeable sample of spiral galaxies. In this paper we present new Space Telescope …
The Angular Correlations of Galaxies in the COSMOS Field
Finoguenov, A.; Aussel, H.; Sanders, D. B. +21 more
We present measurements of the two-point galaxy angular correlation function w(θ) in the COSMOS field. Independent determinations of w(θ) as a function of magnitude limit are presented for both the Hubble Space Telescope (HST) ACS catalog and also the ground-based data from Subaru and the Canada-France-Hawaii Telescope. Despite having significantl…
The Abundances of Light Neutron-Capture Elements in Planetary Nebulae. I. Photoionization Modeling and Ionization Corrections
Kallman, T. R.; Dinerstein, Harriet L.; Sterling, N. C.
We have conducted a large-scale survey of 120 planetary nebulae (PNe) to search for the near-infrared emission lines [Kr III] 2.199 µm and [Se IV] 2.287 µm. The neutron (n)-capture elements Se and Kr may be enriched in a PN if its progenitor star experienced s-process nucleosynthesis and third dredge-up. In order to determine Se and Kr…
A narrow-band search for Lyα emitting galaxies at z = 8.8
Lidman, C.; Moorwood, A.; van der Werf, P. +4 more
Aims:The first star forming galaxies in the early universe should be copious Lyα emitters and may play a significant role in ionizing the intergalactic medium (IGM). It has been proposed that the luminosity function of Lyα emitting galaxies beyond z ~ 6 may be used to constrain the neutral fraction of the IGM during this epoch. In this work we rep…
The Chandra view of galaxy mergers
Ponman, Trevor J.; Brassington, Nicola J.; Read, Andrew M.
From a Chandra survey of nine interacting galaxy systems the evolution of X-ray emission during the merger process has been investigated. It is found that the X-ray luminosity peaks ~300Myr before nuclear coalescence, and then dips, even though we know that rapid and increasing activity is still taking place at this time. It is likely that this dr…
On the Variation of the Peak Asymmetry of Low-l Solar p Modes
Howe, R.; Jiménez-Reyes, S. J.; García, R. A. +4 more
The resonant peaks of solar p modes show small amounts of asymmetry in frequency. Here, we use five independent sets of contemporaneous data, collected over a ~=8 yr period, to investigate whether peak asymmetry in low angular degree p modes changes over the solar activity cycle. Three of the data sets are from instruments on board the ESA/NASA SO…
Satellite observations of separator-line geometry of three-dimensional magnetic reconnection
Escoubet, C. P.; Dandouras, I.; Glassmeier, K. -H. +14 more
Detection of a separator line that connects magnetic nulls and the determination of the dynamics and plasma environment of such a structure can improve our understanding of the three-dimensional (3D) magnetic reconnection process. However, this type of field and particle configuration has not been directly observed in space plasmas. Here we report…
The mass-energy budget of the ionised outflow in NGC 7469
Kaastra, J. S.; Kriss, G. A.; Behar, E. +6 more
Although AGN feedback through ionised winds is of great importance in models of AGN/galaxy coevolution, the mass and energy output via these winds, even in the nearby universe, is poorly understood. The issue is complicated by the wide range of ionisation in the winds, which means that multiwavelength observational campaigns are required to obtain…
Suzaku Observation of the Metallicity Distribution in the Intracluster Medium of the Fornax Cluster
Fukazawa, Yasushi; Makishima, Kazuo; Nakazawa, Kazuhiro +10 more
The metallicity distribution in the Fornax cluster was studied with the XIS instrument on board the Suzaku satellite. The K-shell lines of O and Mg were resolved clearly, and the abundances of O, Mg, Si, S, and Fe were measured with great accuracy. The region within a 4' radius of NGC 1399 shows approximately solar abundances of Fe, Si, and S, whi…