Search Publications
Herschel photometric observations of the low metallicity dwarf galaxy NGC 1705
Elbaz, D.; Bock, J. J.; Clements, D. L. +56 more
We present Herschel SPIRE and PACS photometeric observations of the low metallicity (Z ~ 0.35 Z⊙) nearby dwarf galaxy, NGC 1705, in six wavelength bands as part of the Dwarf Galaxy Survey guaranteed time Herschel key program. We confirm the presence of two dominant circumnuclear IR-bright regions surrounding the central super star clust…
The energy spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
Zezas, A.; Trümper, J. E.; Kylafis, N. D. +1 more
Context. Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) exhibit characteristic X-ray luminosities (both soft and hard) of around 1035 erg s-1 and characteristic power-law, hard X-ray spectra extending to about 200 keV. Two AXPs also exhibit pulsed radio emission.
Aims: Assuming that AXPs and SGRs accr…
GMRT observations of the Ophiuchus galaxy cluster
Paltani, S.; Eckert, D.; Govoni, F. +4 more
Aims: Observations with the Very Large Array telescope at 1477 MHz revealed the presence of a radio mini-halo surrounding the faint central point-like radio source in the Ophiuchus cluster of galaxies. In this work we present a study of the radio emission from this cluster of galaxies at lower radio frequencies.
Methods: We observed the …
Herschel PACS and SPIRE imaging of CW Leonis
Ivison, R. J.; Blommaert, J. A. D. L.; Olofsson, G. +25 more
Herschel PACS and SPIRE images have been obtained over a 30' × 30' area around the well-known carbon star CW Leo (IRC +10 216). An extended structure is found in an incomplete arc of 22' diameter, which is cospatial with the termination shock due to interaction with the interstellar medium (ISM) as defined by Sahai & Chronopoulos from ultravio…
The Vertical Component of the Supergranular Motion
Birch, A. C.; Duvall, T. L., Jr.
Supergranules are observed at the solar photosphere as a cellular horizontal flow pattern with flow diverging from cell centers and converging on cell boundaries. Clark & Johnson calculated that mass conservation leads to an expected vertical flow of only 10 m s-1, which has been difficult to observe. In the present work, Doppler im…
Polarimetric observations of comet 67P/Churyumov-Gerasimenko during its 2008-2009 apparition
Lasue, J.; Sen, A. K.; Gupta, R. +2 more
Context. Remote observations of the light scattered by comet 67P/Churyumov-Gerasimenko dust coma are of major importance for determining the physical properties of the particles and prepare the rendezvous with the ESA/Rosetta spacecraft in 2014.
Aims: Light scattering and especially linear polarization observations allow comparison between di…
Energetic Particle Acceleration and Propagation in Strong CME-Less Flares
Klein, K. -L.; Klassen, A.; Trottet, G.
Flares and coronal mass ejections (CMEs) contribute to the acceleration and propagation of solar energetic particles (SEP) detected in the interplanetary space, but the exact roles of these phenomena are yet to be understood. We examine two types of energetic particle tracers related with 15 CME-less flares that emit bright soft X-ray bursts (GOES…
Self-consistent inner magnetosphere simulation driven by a global MHD model
Tóth, G.; Welling, D.; Jordanova, V. K. +1 more
We present results from a one-way coupling between the kinetic Ring Current Atmosphere Interactions Model with Self-Consistent B field (RAM-SCB) and the Space Weather Modeling Framework (SWMF). RAM-SCB obtains plasma distribution and magnetic field at model boundaries from the Block Adaptive Tree Solar Wind Roe Upwind Scheme (BATS-R-US) magnetohyd…
Lyα emitters in the GOODS-S field. A powerful pure nebular SED with N IV] emission at z = 5.563
Teimoorinia, H.; Fosbury, R. A. E.; Raiter, A.
Context. The Great Observatories Origins Deep Survey (GOODS) has provided us with one of the deepest multi-wavelength views of the distant universe. The combination of multi-band photometry and optical spectroscopy has resulted in the identification of sources whose redshifts extend to values in excess of six. Amongst these distant sources are Lyα…
Saturn's emitted power
Fletcher, Leigh N.; West, Robert A.; Porco, Carolyn C. +18 more
Long-term (2004-2009) on-orbit observations by Cassini Composite Infrared Spectrometer are analyzed to precisely measure Saturn's emitted power and its meridional distribution. Our evaluations suggest that the average global emitted power is 4.952 ± 0.035 W m-2 during the period of 2004-2009. The corresponding effective temperature is 9…