Search Publications
Changes of the Solar Meridional Velocity Profile During Cycle 23 Explained by Flows Toward the Activity Belts
Schüssler, M.; Cameron, R. H.
The solar meridional flow is an important ingredient in Babcock-Leighton type models of the solar dynamo. Global variations of this flow have been suggested to explain the variations in the amplitudes and lengths of the activity cycles. Recently, cycle-related variations in the amplitude of the P 1 2 term in the Legendre deco…
Evolution of interstellar dust with Herschel. First results in the photodissociation regions of NGC 7023
Miville-Deschênes, M. -A.; Boulanger, F.; Abergel, A. +43 more
Context. In photodissociation regions (PDRs), the physical conditions and the excitation evolve on short spatial scales as a function of depth within the cloud, providing a unique opportunity to study how the dust and gas populations evolve with the excitation and physical conditions. The mapping of the PDRs in NGC 7023 performed during the scienc…
Dynamics of solar wind protons reflected by the Moon
Barabash, S.; Holmström, M.; Futaana, Y. +2 more
Solar system bodies that lack a significant atmosphere and significant internal magnetic fields, such as the Moon and asteroids, have been considered passive absorbers of the solar wind. However, ion observations near the Moon by the SELENE spacecraft show that a fraction of the impacting solar wind protons are reflected by the surface of the Moon…
HST/WFPC2 observations of the LMC pulsar PSR B0540-69
Caraveo, P. A.; de Luca, A.; Mignani, R. P. +4 more
Context. The study of the younger, and brighter, pulsars is important for understanding the optical emission properties of isolated neutron stars through observations which, even in the 10 m-class telescope era, are much more challenging for older and fainter objects. PSR B0540-69, the second brightest (V~22) optical pulsar, is obviously a primary…
RR Lyrae Variables in M32 and the Disk of M31
Monachesi, Antonela; Lauer, Tod R.; Dressler, Alan +7 more
We observed two fields near M32 with the Advanced Camera for Surveys/High Resolution Channel (ACS/HRC) on board the Hubble Space Telescope. The main field, F1, is 1farcm8 from the center of M32; the second field, F2, constrains the M31 background, and is 5farcm4 distant. Each field was observed for 16 orbits in each of the F435W (narrow B) and F55…
Effects of Forsterite Grain Shape on Infrared Spectra
Koike, C.; Tsuchiyama, A.; Suto, H. +5 more
The Infrared Space Observatory (ISO) detected several sharp infrared features around young stars, comets, and evolved stars. These sharp features were identified as Mg-rich crystalline silicates of forsterite and enstatite by comparison with spectra from laboratory data. However, certain infrared emission bands in the observed spectra cannot be id…
On the Origin of the Red Excess in Very Young Super Star Clusters: The Case of SBS 0335-052E
Östlin, G.; Hayes, M.; Adamo, A. +1 more
The spectral energy distribution analysis of very young unresolved star clusters challenges our understanding of the cluster formation process. Studies of resolved massive clusters in the Milky Way and in the nearby Magellanic Clouds show us that the contribution from photoionized gas is very important during the first Myr of cluster evolution. We…
Star-formation in the central kpc of the starburst/LINER galaxy NGC 1614
Beswick, R.; Aalto, S.; Thomasson, M. +1 more
Aims: The aim is to investigate the star-formation and LINER (low ionization nuclear emission line region) activity within the central kiloparsec of the galaxy NGC 1614. In this paper the radio continuum morphology, which provides a tracer of both nuclear and star-formation activity, and the distribution and dynamics of the cold molecular and…
The Minor Role of Gas-Rich Major Mergers in the Rise of Intermediate-Mass Early Types at z <= 1
Barro, Guillermo; Pérez-González, Pablo G.; Balcells, Marc +4 more
We study the evolution of galaxy structure since z ~ 1 to the present. From a Great Observatories Origins Deep Survey South (GOODS-S) multi-band catalog, we define (blue) luminosity- and mass-weighted samples, limited by MB <= -20 and M sstarf >= 1010 M sun, comprising 1122 and 987 galaxies, respec…
Herschel-SPIRE FTS spectroscopy of the carbon-rich objects AFGL 2688, AFGL 618, and NGC 7027
Ivison, R. J.; Olofsson, G.; Savini, G. +22 more
We present far-infrared and submillimetre spectra of three carbon-rich evolved objects, AFGL 2688, AFGL 618 and NGC 7027. The spectra were obtained with the SPIRE Fourier-transform spectrometer on board the Herschel Space Observatory, and cover wavelengths from 195-670 µm, a region of the electromagnetic spectrum hitherto difficult to study …