Search Publications
Near- and mid-IR morphology of the water maser emitting planetary nebula K 3-35
Guerrero, M. A.; Lagadec, E.; Miranda, L. F. +2 more
The shaping process of planetary nebulae (PNe) takes place during the short transition from the asymptotic giant branch (AGB) phase to the white dwarf stage. The young PN K 3-35 represents a unique case where a small-sized water maser ring has been linked to the launch of collimated outflows that shape the nebula. The contrasting optical and radio…
Observation of kink waves and their reconnection-like origin in solar spicules
Ebadi, H.; Ghiassi, M.
We analyze the time series of Ca II H-line obtained from Hinode/SOT on the solar limb. We follow three cases of upwardly propagating kink waves along a spicule and inverted Y-shaped structures at the cusp of it. The time-distance analysis shows that the axis of spicule undergos quasi-periodic transverse displacement at different heights from the p…
The Variable Near-infrared Counterpart of the Microquasar GRS 1758-258
Luque-Escamilla, Pedro L.; Martí, Josep; Muñoz-Arjonilla, Álvaro J.
We present a new study of the microquasar system GRS 1758-258 in the near-infrared domain based on archival observations with the Hubble Space Telescope and the NICMOS camera. In addition to confirming the near-infrared counterpart pointed out by Muñoz-Arjonilla et al., we show that this object displays significant photometric variability. From it…
Energy-dependent Evolution in IC10 X-1: Hard Evidence for an Extended Corona and Implications
Steiner, J. F.; Stevens, I. R.; Barnard, R. +3 more
We have analyzed a ~130 ks XMM-Newton observation of the dynamically confirmed black hole + Wolf-Rayet (BH+WR) X-ray binary (XB) IC10 X-1, covering ~1 orbital cycle. This system experiences periodic intensity dips every ~35 hr. We find that energy-independent evolution is rejected at a >5σ level. The spectral and timing evolution of IC10 X-1 ar…
Modulated X-ray emission of the magnetic O8.5V-star Tr16-22
Wade, Gregg A.; Nazé, Yaël; Petit, Véronique
Using an extensive X-ray dataset, we analyzed the X-ray emission of the massive O-star Tr16-22, which was recently found to be magnetic. Its bright X-ray emission is found to be modulated with a ~54 d period. This timescale should represent the rotational timescale of the star, as it does for other magnetic massive stars. In parallel, new spectrop…
The Herschel Virgo Cluster Survey. XV. Planck submillimetre sources in the Virgo Cluster
Clements, D. L.; González-Nuevo, J.; Herranz, D. +21 more
We cross-correlate the Planck Catalogue of Compact Sources (PCCS) with the fully sampled 84 deg2Herschel Virgo Cluster Survey (HeViCS) fields. We search for and identify the 857 and 545 GHz PCCS sources in the HeViCS fields by studying their FIR/submm and optical counterparts. We find 84 and 48 compact Planck sources in the HeViCS field…
Spectral Lag Features of GRB 060814 from Swift BAT and Suzaku Observations
Roychoudhury, Arundhati; Sarkar, Samir K.; Bhadra, Arunava
This work reports a study on the spectral lag of the prompt emission spectrum of a multi-pulse gamma-ray burst (GRB) GRB 060814 (z = 0.84) using the observations of the Swift Burst Alert Telescope and the Suzaku Wide Area Monitor. We found that the spectral lag for GRB 060814 is positive for the first two and the fourth pulses, while the third pul…
Diagnostics of the Solar Corona from Comparison between Faraday Rotation Measurements and Magnetohydrodynamic Simulations
Kasper, J. C.; Cohen, O.; Le Chat, G. +1 more
Polarized natural radio sources passing behind the Sun experience Faraday rotation as a consequence of the electron density and magnetic field strength in coronal plasma. Since Faraday rotation is proportional to the product of the density and the component of the magnetic field along the line of sight of the observer, a model is required to inter…
Mid-infrared spectroscopy of components in chondrites: Search for processed materials in young Solar Systems and comets
Lisse, C. M.; Grady, M. M.; Morlok, A. +2 more
We obtained mid-infrared spectra of chondrules, matrix, CAIs and bulk material from primitive type 1-4 chondrites in order to compare them with the dust material in young, forming Solar Systems and around comets. Our aim is to investigate whether there are similarities between the first processed materials in our early Solar System and protoplanet…
Variability of Titan's induced magnetotail: Cassini magnetometer observations
Dougherty, Michele K.; Simon, Sven; Neubauer, Fritz M. +1 more
We study the structure and variability of Titan's magnetotail by analyzing Cassini magnetic field observations from all tail crossings between 2005 and 2013. Titan's magnetotail is strongly affected by fluctuations in the ambient magnetospheric field conditions. Therefore, even Titan flybys with nearly identical trajectories may reveal a completel…