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Phase-resolved optical and X-ray spectroscopy of low-mass X-ray binary X1822-371
Hakala, P.; Vilhu, O.; Somero, A. +2 more
Context. X1822-371 is the prototypical accretion disc corona X-ray source, a low-mass X-ray binary viewed at very high inclination, thereby allowing the disc structure and extended disc coronal regions to be visible. As the brightest (closest) such source, X1822-371 is ideal for studying the shape and edge structure of an accretion disc, and compa…
Discovery of the neutron star spin and a possible orbital period from the Be/X-ray binary IGR J05414-6858 in the LMC
Pietsch, W.; Haberl, F.; Greiner, J. +7 more
Context. The number of known Be/X-ray binaries in the Large Magellanic Cloud is small compared to the observed population of the Galaxy or the Small Magellanic Cloud. The discovery of a system in outburst provides the rare opportunity to measure its X-ray properties in detail.
Aims: IGR J05414-6858 was discovered in 2010 with INTEGRAL and was…
Discovery of Three Distant, Cold Brown Dwarfs in the WFC3 Infrared Spectroscopic Parallels Survey
Scarlata, C.; Malkan, M.; Teplitz, H. +12 more
We present the discovery of three late-type (>=T4.5) brown dwarfs, including a probable Y dwarf, in the WFC3 Infrared Spectroscopic Parallels (WISP) survey. We use the G141 grism spectra to determine the spectral types of the dwarfs and derive distance estimates based on a comparison with nearby T dwarfs with known parallaxes. These are the mos…
Plasma Wave Observations at Earth, Jupiter, and Saturn
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +5 more
Plasma wave emissions have been detected at all of the planets that have been visited by spacecraft equipped with plasma wave instruments (Mercury will be explored by the plasma wave instrument on BepiColombo Mercury Magnetospheric Orbiter in 2022.). Many of these emissions are believed to play a role in the acceleration of energetic particles, es…
SN 2002bu—Another SN 2008S-like Transient
Kochanek, C. S.; Dai, X.; Szczygieł, D. M.
We observed supernova (SN) 2002bu in the near-IR with the Hubble Space Telescope (HST), the mid-IR with the Spitzer Space Telescope, and in X-rays with Swift 10 years after the explosion. If the faint L H ~ 102 L ⊙ HST near-IR source at the transient position is the near-IR counterpart of SN 2002bu, then the source…
Examining the Radio-loud/Radio-quiet Dichotomy with New Chandra and VLA Observations of 13 UGC Galaxies
Capetti, A.; Grandi, P.; Chiaberge, M. +7 more
We present the results from new ~15 ks Chandra-ACIS and 4.9 GHz Very Large Array (VLA) observations of 13 galaxies hosting low-luminosity active galactic nuclei (AGNs). This completes the multiwavelength study of a sample of 51 nearby early-type galaxies described in Capetti & Balmaverde and Balmaverde & Capetti. The aim of the three previ…
Vorticity of Subsurface Flows of Emerging and Decaying Active Regions
Howe, R.; Komm, R.; Hill, F.
We study the temporal variation of the vorticity of subsurface flows of 828 active regions and 977 quiet regions. The vorticity of these flows is derived from measured subsurface velocities. The horizontal flows are determined by analyzing high-resolution Global Oscillation Network Group Doppler data with ring-diagram analysis covering a range of …
Quantification of middle and lower cloud variability and mesoscale dynamics from Venus Express/VIRTIS observations at 1.74 µm
Baines, Kevin H.; Grinspoon, David H.; Momary, Thomas W. +1 more
We present an analysis of VIRTIS-M-IR observations of 1.74 µm emission from the nightside of Venus. The 1.74 µm window in the near infrared spectrum of Venus is an ideal proxy for investigating the evolution of middle and lower cloud deck opacity of Venus because it exhibits good signal to noise due to its brightness, good contrast bet…
On the origin of the jet-like radio/X-ray morphology of G290.1-0.8
Bocchino, F.; Combi, J. A.; García, F. +3 more
Context. The origin and evolution of supernova remnants of the mixed-morphology class is not well understood. Several remnants present distorted radio or X-ray shells with jet-like structures. G290.1-0.8 (
Aims: We aim to investigate the nature of this supernova remnant in order …
Herschel-ATLAS/GAMA: spatial clustering of low-redshift submm galaxies
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +44 more
We have measured the clustering properties of low-redshift (z < 0.3) submm galaxies detected at 250 µm in the Herschel-ATLAS science demonstration phase field. We selected a sample for which we have high-quality spectroscopic redshifts, obtained from reliably matching the 250-µm sources to a complete (for r < 19.4) sample of gala…