Search Publications
The quasi-periodic behavior of recurrent jets caused by emerging magnetic flux
Yang, J. Y.; Liang, H. F.; Jiang, Y. C. +2 more
A series of recurring jets occurred at the edge of an active region NOAA 11459 on 2012 April 20, and they were observed simultaneously at EUV and soft X-ray wavelengths. They also were sometimes associated with a hard X-ray source at the base region. The jets might have resulted from magnetic reconnection between the newly emerging flux and the pr…
Non-local scalar fields inflationary mechanism in light of Planck 2013
Sheikhahmadi, Haidar; Ghorbani, Soheyla; Saaidi, Khaled
A generalization of the canonical and non-canonical theory of inflation is introduced in which the kinetic energy term in action is written as non-local term. The inflationary universe within the framework of considering this non-locality will be studied. To investigate the effects of non-locality on the inflationary parameters we consider two wel…
Constraints on the combined models with R 2 ‑ q f ( R )
Geng, Chao-Qiang; Lee, Chung-Chi; Lin, Shan
We investigate the observational constraints on the modified gravity, which combines the
Particle-in-cell modeling of Dual Segmented Langmuir Probe on PROBA2
Imtiaz, Nadia; Marchand, Richard
We model the current characteristics of the Dual Segmented Langmuir Probe (DSLP), which is a part of the scientific payload of the ESA satellite PROBA2. It is used for the directional measurement of plasma parameters in the ionosphere at an altitude of approximately 725 km. The DSLP consists of two independent segmented Langmuir probes. Each probe…
The distance to the Galactic center determined by A–F stars
Branham, Richard L.
The distance from the sun to the center of the Galaxy
Improved SOT (Hinode mission) high resolution solar imaging observations
Koutchmy, S.; Adjabshirizadeh, A.; Goodarzi, H.
We consider the best today available observations of the Sun free of turbulent Earth atmospheric effects, taken with the Solar Optical Telescope (SOT) onboard the Hinode spacecraft. Both the instrumental smearing and the observed stray light are analyzed in order to improve the resolution. The Point Spread Function (PSF) corresponding to the blue …
Ultraviolet spectral behavior of AO Psc and V1223 Sgr from the HST and IUE satellites
Sanad, M. R.
We present a spectroscopic study of two intermediate polar systems, AO Psc and V1223 Sgr observed with the Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) and International Ultraviolet Explorer (IUE) during the period 1980–2000. The reddening of two systems is determined from the 2200 Å feature. The ultraviolet emission line…
Black holes in 4 nearby radio galaxies
Cotter, Garret; Readhead, Tony; Durré, Mark +2 more
We study the velocity dispersion profiles of the nuclei of NGC 1326, 2685, 5273 and 5838 in the CO first overtone band. There is evidence for a black hole (BH) in NGC 1326 and 5838. Gas is seen flowing out of the nuclear region of NGC 5273. We put upper limits on the nuclear BHs responsible for its activity and that of NGC 2685.
The far-infrared properties of broad absorption line quasars from the Sloan Digital Sky Survey
Pu, Xingting
We present the results of a study which uses a sample of 320 Sloan Digital Sky Survey (SDSS) quasars with 1.68≤z≤2.28 inside the Herschel Stripe 82 Survey (HerS) region to compare the mid-infrared (MIR) and far-infrared (FIR) properties of broad absorption line (BAL) and non-BAL quasars. The BAL quasar sample comprises 56 high-ionization BAL (HiBA…
Dust in BL Lac objects and Fanaroff-Riley radio galaxies: infrared region
Seal Braun, P.
Here 28 BL Lac objects, 18 FR I type radio galaxies, 4 FR I/II type radio galaxies and 10 FR II type radio galaxies are studied from FIR (far infrared) to optical region (180 µm to 0.44 µm) to understand the nature of infrared emission from these objects and the physical properties of dust in the emitting region. Using the flux densiti…