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Spitzer observations of a circumstellar nebula around the candidate luminous blue variable MWC 930
Umana, G.; Hora, J. L.; Trigilio, C. +4 more
Context. The source MWC 930 is a star just ~2° above the Galactic plane whose nature is not clear and has not been studied in detail so far. While a post-asymptotic giant branch classification was proposed in the past, studies of its optical spectrum and photometry pointed toward strong variability, therefore, the object was reclassified as a lumi…
Properties of Magnetic Neutral Line Gradients and Formation of Filaments
Karachik, Nina V.; Pevtsov, Alexei A.
We investigate the gradients of magnetic fields across neutral lines (NLs) and compare their properties for NLs with and without chromospheric filaments. Our results show that there is a range of preferred magnetic field gradients where the filament formation is enhanced. On the other hand, a horizontal gradient of the magnetic field across an NL …
Probing the interstellar medium of NGC 1569 with Herschel
Barmby, P.; Lebouteiller, V.; Madden, S. C. +3 more
NGC 1569 has some of the most vigorous star formation among nearby galaxies. It hosts two super star clusters (SSCs) and has a higher star formation rate (SFR) per unit area than other starburst dwarf galaxies. Extended emission beyond the galaxy's optical body is observed in warm and hot ionized and atomic hydrogen gas; a cavity surrounds the SSC…
Testing WMAP data via Planck radio and SZ catalogues
Shanks, T.; Whitbourn, J. R.; Sawangwit, U.
The prime evidence underpinning the standard Λ cold dark matter cosmological model is the cosmic microwave background (CMB) power spectrum as observed by Wilkinson Microwave Anisotropy Probe (WMAP) and other microwave experiments. But Sawangwit and Shanks have recently shown that the WMAP CMB power spectrum is highly sensitive to the beam profile …
Relative pointing offset analysis of calibration targets with repeated observations with Herschel-SPIRE Fourier-transform spectrometer
Valtchanov, Ivan; Hopwood, Rosalind; Lu, Nanyao +9 more
We present a method to derive the relative pointing offsets for SPIRE Fourier-Transform Spectrometer (FTS) solar system object (SSO) calibration targets, which were observed regularly throughout the Herschel mission. We construct ratios R obs( ν) of the spectra for all observations of a given source with respect to a reference. The refe…
The Period Analysis of V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782
Wolf, M.; Kučáková, H.; Uhlař, R. +1 more
The minimum timings of eclipsing binaries V418 Aql, SU Boo, RV CVn, CR Cas, GV Cyg, V432 Per, and BD+42 2782 were collected and analyzed. Their long-term behavior was studied via period analysis, revealing a periodic term in eclipse times. We derived 576 new times of minimum. Hence, to describe the periodic variation, a third-body hypothesis was p…
HST observations of the limb polarization of Titan
Buenzli, E.; Schmid, H. M.; Bazzon, A.
Context. Titan is an excellent test case for detailed studies of the scattering polarization from thick hazy atmospheres. Accurate scattering and polarization parameters have been provided by the in situ measurements of the Cassini-Huygens landing probe. For Earth-bound observations Titan can only be observed at a backscattering situation, where t…
An XMM-Newton View of the Radio Galaxy 3C 411
Reynolds, Christopher S.; Tombesi, Francesco; Bostrom, Allison
We present the first high signal-to-noise XMM-Newton observations of the broad-line radio galaxy 3C 411. After fitting various spectral models, an absorbed double power-law (PL) continuum and a blurred relativistic disk reflection model (kdblur) are found to be equally plausible descriptions of the data. While the softer PL component (Γ = 2.11) of…
Meridional maps of Saturn's thermal electrons
Carbary, J. F.; Rymer, A. M.
All available observations (July 2004 to June 2011) made by the electron spectrometer (ELS) of the Cassini Plasma Science instrument were used to generate meridional maps of thermal electron fluxes (10-20,000 eV) separated by dayside and nightside. The maps had a spatial resolution of 1 × 1 RS (1 RS = 60,238 km), 10° resoluti…
XMM-Newton Observations of Three Interacting Luminous Infrared Galaxies
Maiolino, Roberto; Komossa, S.; Nicastro, Fabrizio +8 more
We investigate the X-ray properties of three interacting luminous infrared galaxy systems. In one of these systems, IRAS 18329+5950, we resolve two separate sources. A second and third source, IRAS 19354+4559 and IRAS 20550+1656, have only a single X-ray source detected. We compare the observed emission to point-spread function (PSF) profiles and …