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Understanding the 8 µm versus Paα Relationship on Subarcsecond Scales in Luminous Infrared Galaxies
Colina, Luis; Alonso-Herrero, Almudena; Díaz-Santos, Tanio +3 more
This work explores in detail the relation between the 8 µm and the Paα emissions for 122 H II regions identified in a sample of 10 low-z LIRGs with nearly constant metallicity [12 + log (O/H) ~ 8.8]. We use Gemini T-ReCS high spatial resolution (lesssim0.4''~120 pc for the average distance of 60 Mpc of our sample) mid-infrared imaging (at 8.…
Solar Magnetic Tracking. II. The Apparent Unipolar Origin of Quiet-Sun Flux
Lamb, D. A.; DeForest, C. E.; Hagenaar, H. J. +2 more
We investigate the origin of small-scale flux concentrations in the quiet Sun. In apparent violation of the physical requirement for flux balance, 94% of the features containing newly detected flux are unipolar at a resolution of 1.2''. We analyze 2619 of these apparent unipolar emergences in an image sequence from the SOHO MDI magnetograph and co…
Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst
Lee, C. -U.; Lähteenmäki, A.; Umana, G. +58 more
Context: The blazar
First high-energy observations of narrow-line Seyfert 1s with INTEGRAL/IBIS
de Rosa, A.; Masetti, N.; Bird, A. J. +8 more
Narrow-line Seyfert 1 (NLS1) galaxies are very interesting objects which display peculiar properties when compared to their broad-line analogues (BLS1). Although well studied in many wavebands, their behaviour at >10 keV is poorly studied and yet important to discriminate between models invoked to explain the complexity observed in the X-ray ba…
Dune-forming winds on Titan and the influence of topography
Tokano, Tetsuya
Numerous extended dunes on Saturn's moon Titan detected by the Cassini RADAR constrain the long-term pattern of surface winds. We analyse the statistics of surface wind speed and direction and their spatial and temporal variability predicted by a general circulation model (GCM) in order to constrain surface wind predictions of this GCM by dune obs…
An 84-µG magnetic field in a galaxy at redshift z = 0.692
Jorgenson, Regina A.; Heiles, Carl; Wolfe, Arthur M. +2 more
The magnetic field pervading our Galaxy is a crucial constituent of the interstellar medium: it mediates the dynamics of interstellar clouds, the energy density of cosmic rays, and the formation of stars. The field associated with ionized interstellar gas has been determined through observations of pulsars in our Galaxy. Radio-frequency measuremen…
Automatic Detection and Classification of Coronal Holes and Filaments Based on EUV and Magnetogram Observations of the Solar Disk
Habbal, Shadia Rifai; Scholl, Isabelle F.
A new method for the automated detection of coronal holes and filaments on the solar disk is presented. The starting point is coronal images taken by the Extreme Ultraviolet Telescope on the Solar and Heliospheric Observatory (SOHO/EIT) in the Fe IX/X 171 Å, Fe XII 195 Å, and He II 304 Å extreme ultraviolet (EUV) lines and the corresponding full-d…
GMASS ultradeep spectroscopy of galaxies at z ~ 2 . I. The stellar metallicity
Berta, S.; Cimatti, A.; Daddi, E. +12 more
Context: Galaxy metallicities have been measured to redshift z∼2 by gas-phase oxygen abundances of the interstellar medium using the R{23} and N2 methods. Galaxy stellar metallicities provide crucial data for chemical evolution models but have not been assessed reliably much outside the local Universe.
Aims: We determine the iron-abundance, st…
A Test of Three Optical Flow Techniques—LCT, DAVE, and NAVE
Chae, Jongchul; Sakurai, Takashi
A time sequence of high-quality images currently produced by high-resolution observations either from the ground or in space may be utilized to determine the transverse flow field on the plane of the sky with the help of optical flow techniques. We have examined the performance of three different methods—a well-known technique called local correla…
Observational Test of Coronal Magnetic Field Models. I. Comparison with Potential Field Model
Liu, Yu; Lin, Haosheng
Recent advances have made it possible to obtain two-dimensional line-of-sight magnetic field maps of the solar corona from spectropolarimetric observations of the Fe XIII 1075 nm forbidden coronal emission line. Together with the linear polarization measurements that map the azimuthal direction of the coronal magnetic field projected in the plane …