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Visibility of coronal mass ejections in SOHO/LASCO coronagraphs
Bronarska, K.; Michalek, G.; Yashiro, S. +1 more
We studied the detection efficiency of coronal mass ejections (CMEs) of the Large Angle Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). For this purpose LASCO/SOHO observations are compared with these obtained by the two Solar Terrestrial Relations Observatory (STEREO) satellites in quadrature in the perio…
Multi-label Learning for Detection of CME-Associated Phenomena
Yang, Y. H.; Xie, Z. X.; Peng, B. +2 more
Coronal mass ejections (CMEs) are considered as one of the driving sources of space weather. They are usually associated with many physical phenomena, e.g. flares, coronal dimmings, and sigmoids. To detect these phenomena, traditional supervised-learning methods assumed that at most one event occurred in a CME; therefore each CME instance is assoc…
AKARI Spectroscopy of Quasars at 2.5 - 5 µm
Nakagawa, Takao; Ohyama, Youichi; Im, Myungshin +5 more
Utilizing a unique capability of AKARI that allows deep spectroscopy at 2.5 - 5.0 µm, we performed a spectroscopy study of more than 200 quasars through one of the AKARI mission programs, QSONG (Quasar Spectroscopic Observation with NIR Grism). QSONG targeted 155 high redshift (3.3 < z < 6.42) quasars and 90 low redshift active galacti…
Gas emission and dynamics in the infrared dark cloud G31.23+0.05
Zhang, Chuan-Peng; Wang, Jun-Jie; Xu, Jin-Long +1 more
We performed a multiwavelength study towards the infrared dark cloud (IRDC) G31.23+0.05 with new CO observations from Purple Mountain Observatory and archival data (the GLIMPSE, MIPSGAL, HERSCHEL, ATLASGAL, BGPS and NVSS surveys). From these observations, we identified three IRDCs with systemic velocities of 108.36+/- 0.06 (cloud A), 104.22+/- 0.1…
Infrared characteristics of the BIS catalog objects
Nesci, R.; Rossi, C.; Gaudenzi, S. +3 more
We studied several color-color infrared diagrams of the 276 late type stars of the BIS catalog. For 95 of these stars we derived spectral classification from our slit spectroscopy. From the 2MASS color diagram we concluded that none of the sample stars is a dwarf. The WISE 3.4-12 vs 12-22 plot is the best to discriminate the variability type (Mira…
Fundamental Parameters of the Eclipsing Binary TU Canis Majoris
Mennickent, R. E.; Garcés L., J.; Zharikov, S.
We present a spectroscopic and photometric study of the eclipsing binary TU Canis Majoris aimed to obtain their fundamental stellar parameters and evolutionary stage. Our results indicate that the masses, radii, temperatures, and luminosities for the primary and secondary stars are: {M}1=1.761+/- 0.012 {M}⊙ , {M}2=…
Unveiling multiple AGN activity in galaxy mergers
Bianchi, S.; Guainazzi, M.; Vignali, C. +13 more
In this paper we present an overview of the MAGNA (Multiple AGN Activity) project aiming at a comprehensive study of multiple super-massive black hole systems. With the main goal of characterizing the sources in merging systems at different stages of evolution, we selected a sample of objects optically classified as multiple systems on the basis o…
Long- and Mid-Term Variations of the Soft X-ray Flare Type in Solar Cycles
Chertok, I. M.; Belov, A. V.
Using data from the Geostationary Operational Environmental Satellites (GOES) spacecraft in the 1 - 8 Å wavelength range for Solar Cycles 23, 24, and part of Cycles 21 and 22, we compare mean temporal parameters (rise and decay times, and duration) and the proportion of impulsive short-duration events (SDE) and gradual long-duration events (LDE) a…
Analysis of Quasi-periodic Oscillations and Time Lag in Ultraluminous X-Ray Sources with XMM-Newton
Zhang, Shu; Li, Zi-Jian; Xiao, Guang-Cheng +6 more
We investigated the power density spectrum (PDS) and time lag of ultraluminous X-ray sources (ULXs) observed by XMM-Newton. We determined the PDSs for each ULX and found that five of them show intrinsic variability due to obvious quasi-periodic oscillations (QPOs) of mHz-1 Hz, consistent with previous reports. We further investigated these five UL…
A curious ringlet that shares Prometheus' orbit but precesses like the F ring
Hedman, M. M.; Carter, B. J.
Images obtained by the Cassini spacecraft of the region just beyond Saturn's main rings reveal a previously unreported narrow and dusty ringlet that has dynamical connections with both Saturn's small satellite Prometheus and the F ring. The radial position of this ringlet is observed to vary with time and longitude, indicating that it is eccentric…