Search Publications
The Small-scale Structure of Photospheric Convection Retrieved by a Deconvolution Technique Applied to Hinode/SP Data
Solanki, S. K.; Shimizu, T.; Quintero Noda, C. +3 more
Solar granules are bright patterns surrounded by dark channels, called intergranular lanes, in the solar photosphere and are a manifestation of overshooting convection. Observational studies generally find stronger upflows in granules and weaker downflows in intergranular lanes. This trend is, however, inconsistent with the results of numerical si…
A Model for Dissipation of Solar Wind Magnetic Turbulence by Kinetic Alfvén Waves at Electron Scales: Comparison with Observations
Saur, Joachim; Schreiner, Anne
In hydrodynamic turbulence, it is well established that the length of the dissipation scale depends on the energy cascade rate, I.e., the larger the energy input rate per unit mass, the more the turbulent fluctuations need to be driven to increasingly smaller scales to dissipate the larger energy flux. Observations of magnetic spectral energy dens…
The Horizontal Branch Population of NGC 1851 as Revealed by the Ultraviolet Imaging Telescope (UVIT)
Stalin, C. S.; Rao, N. Kameswara; Murthy, J. +15 more
We present the UV photometry of the globular cluster NGC 1851 using images acquired with the Ultraviolet Imaging Telescope (UVIT) onboard the ASTROSAT satellite. Point-spread function fitting photometric data derived from images in two far-UV (FUV) filters and one near-UV (NUV) filter are used to construct color-magnitude diagrams (CMDs), in combi…
Study of orbital and superorbital variability of LSI +61° 303 with X-ray data
Tsygankov, S.; Takahashi, H.; Babyk, Iu. +4 more
LSI +61° 303 is one of the few X-ray binaries with a Be star companion from which radio, X-rays and high-energy gamma-ray (GeV and TeV) emission have been observed. The nature of the high-energy activity of the system is not yet fully understood, but it is widely believed that it is generated due to the interaction of the relativistic electrons le…
An extinction-free AGN selection by 18-band SED fitting in mid-infrared in the AKARI NEP deep field
Hashimoto, Tetsuya; Goto, Tomotsugu; Matsuhara, Hideo +2 more
We have developed an efficient active galactic nucleus (AGN) selection method using 18-band spectral energy distribution (SED) fitting in mid-infrared (mid-IR). AGNs are often obscured by gas and dust, and those obscured AGNs tend to be missed in optical, UV and soft X-ray observations. Mid-IR light can help us to recover them in an obscuration-fr…
Molecular clouds as origin of the Fermi gamma-ray GeV excess
Biermann, Peter L.; de Boer, Wim; Bosse, Léo +2 more
The so-called GeV excess of the diffuse Galactic gamma-ray emission, as observed by the Fermi-LAT satellite, is studied with a spectral template fit based on energy spectra for each relevant process of gamma-ray emission. This has the advantage over "conventional" analysis because one includes the spectral knowledge of physical processes into the …
A re-analysis of the NuSTAR and XMM-Newton broad-band spectrum of Serpens X-1
Sanna, A.; Di Salvo, T.; Burderi, L. +4 more
Context. High-resolution X-ray spectra of neutron star low-mass X-ray binaries (LMXBs) in the energy range 6.4-6.97 keV are often characterized by the presence of Kα transition features of iron at different ionization stages. Since these lines are thought to originate by reflection of the primary Comptonization spectrum over the accretion disk, th…
SCUBA-2 follow-up of Herschel-SPIRE observed Planck overdensities
Clements, David L.; Lagache, Guilaine; Scott, Douglas +11 more
We present SCUBA-2 follow-up of 61 candidate high-redshift Planck sources. Of these, 10 are confirmed strong gravitational lenses and comprise some of the brightest such submm sources on the observed sky, while 51 are candidate proto-cluster fields undergoing massive starburst events. With the accompanying Herschel-Spectral and Photometric Imaging…
The Infrared and Radio Flux Densities of Galactic H II regions
Makai, Z.; Anderson, L. D.; Mascoop, J. L. +1 more
We derive infrared and radio flux densities of all ∼1000 known Galactic H II regions in the Galactic longitude range 17\buildrel{\circ}\over{.} 5< {\ell }< 65^\circ . Our sample comes from the Wide-Field Infrared Survey Explorer (WISE) catalog of Galactic H II regions. We compute flux densities at six wavelengths in the infrared (Spitzer GLI…
(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies. IV. Physical properties derived from spectral energy distributions
Ilbert, O.; Smolčić, V.; Murphy, E. J. +10 more
Context. Submillimetre galaxies (SMGs) in the early Universe are potential antecedents of the most massive galaxies we see in the present-day Universe. An important step towards quantifying this galactic evolutionary connection is to investigate the fundamental physical properties of SMGs, such as their stellar mass content (M⋆) and sta…