Search Publications
On discovery of strong magnetic field in the binary system HD34736
Romanyuk, I. I.; Semenko, E. A.; Yakunin, I. A. +1 more
We present the results of a study of the star HD34736. The spectropolarimetric observations carried out at the 6-m telescope showed the presence of a strong variable longitudinal magnetic field, exceeding ‑4500 G. The analysis of the Hipparcos photometry gives a set of possible periods of the brightness variability of the star, of which
Interpretation of the X-ray spectral variation of 1H 0707-495 with a variable double partial covering model
Ebisawa, Ken; Mizumoto, Misaki; Sameshima, Hiroaki
The narrow-line Seyfert 1 galaxy 1H 0707-495 is known to exhibit significant X-ray spectral variations. Its X-ray energy spectrum is characterized by a strong soft excess emission, an extremely deep iron K-edge structure at ∼ 7 keV, and a putative iron L-line/edge feature at ∼ 1 keV. We have found that the energy spectrum of 1H 0707-495 in 0.5-10 …
Fast Bayesian inference for slow-roll inflation
Ringeval, Christophe
We present and discuss a new approach increasing by orders of magnitude the speed of performing Bayesian inference and parameter estimation within the framework of slow-roll inflation. The method relies on the determination of an effective likelihood for inflation which is a function of the primordial amplitude of the scalar perturbations compleme…
SPIRE point source photometry: within the Herschel interactive processing environment (HIPE)
Griffin, Matt; Pearson, Chris; Lim, Tanya +11 more
The different algorithms appropriate for point source photometry on data from the SPIRE instrument on-board the Herschel Space Observatory, within the Herschel Interactive Processing Environment (HIPE) are compared. Point source photometry of a large ensemble of standard calibration stars and dark sky observations is carried out using the 4 major …
X-ray AGN in the XMM-LSS galaxy clusters: no evidence of AGN suppression
Chiappetti, L.; Pierre, M.; Surdej, J. +6 more
We present a study of the overdensity of X-ray-selected active galactic nuclei (AGN) in 33 galaxy clusters in the XMM-LSS field (The XMM-Newton Large Scale Structure Survey), up to redshift z = 1.05 and further divided into a lower (0.14 ≤ z ≤ 0.35) and a higher redshift (0.43 ≤ z ≤ 1.05) subsample. Previous studies have shown that the presence of…
Interaction and Merging of two Sinistral Filaments
Liu, Yu; Wang, Haimin; Yang, Jiayan +4 more
In this paper, we report the interaction and subsequent merging of two sinistral filaments (F1 and F2) occurring at the boundary of AR 9720 on 2001 December 6. The two filaments were close and nearly perpendicular to each other. The interaction occurred after F1 was erupted and the eruption was impeded by a more extended filament channel (FC) stan…
Resolving Differences in Absolute Irradiance Measurements Between the SOHO/CELIAS/SEM and the SDO/EVE
Judge, D. L.; Didkovsky, L. V.; Wieman, S. R.
The Solar EUV Monitor (SEM) onboard SOHO has measured absolute extreme ultraviolet (EUV) and soft X-ray solar irradiance nearly continuously since January 1996. The EUV Variability Experiment (EVE) on SDO, in operation since April of 2010, measures solar irradiance in a wide spectral range that encompasses the band passes (26 - 34 nm and 0.1 - 50 …
Filament L1482 in the California molecular cloud
Esimbek, J.; Tang, X. D.; Zhou, J. J. +4 more
Aims: The process of gravitational fragmentation in the L1482 molecular filament of the California molecular cloud is studied by combining several complementary observations and physical estimates. We investigate the kinematic and dynamical states of this molecular filament and physical properties of several dozens of dense molecular clumps e…
Molecular gas heating in Arp 299
van der Werf, P. P.; Xilouris, E. M.; Meijerink, R. +3 more
(Ultra) luminous infrared galaxies ((U)LIRGs) are nearby laboratories that allow us to study similar processes to those occurring in high redshift submillimeter galaxies. Understanding the heating and cooling mechanisms in these galaxies can give us insight into the driving mechanisms in their more distant counterparts. Molecular emission lines pl…
In-flight calibration of the Dawn Framing Camera II: Flat fields and stray light correction
Mottola, S.; Matz, K. -D.; Schröder, S. E. +1 more
The NASA Dawn spacecraft acquired thousands of images of asteroid Vesta during its year-long orbital tour, and is now on its way to asteroid Ceres. A method for calibrating images acquired by the onboard Framing Camera was described by Schröder et al. (Schröder et al. [2013]. Icarus 226, 1304). However, their method is only valid for point sources…