Search Publications
A search for evolutionary changes in the pulsation period of the classical Cepheid V609 Cygni
Dambis, A. K.; Berdnikov, L. N.; Pastukhova, E. N.
A total of 820 magnitude estimates were made for the long-period classical Cepheid V609 Cyg (
Ion escape from the upper ionosphere of Titan triggered by the solar wind
Lazar, M.; Moslem, W. M.; El-Labany, S. K. +3 more
The observed escape of ions from the ionosphere of Titan suggests a potential role of the solar wind in the interaction with the upper atmospheric layers. We investigate such a plausible scenario using a hydrodynamic fluid approach for the plasma expansion in the upper ionosphere of Titan, combining (Maxwellian) electrons and three different speci…
Swift, NuStar, and XMM-Newton observations of the NLS1 galaxy RX J2317.8-4422 in an extreme X-ray low flux state
Fabian, Andrew C.; Komossa, S.; Miniutti, Giovanni +6 more
We report the discovery of RX J2317.8-4422 in an extremely low X-ray flux state by the Neil Gehrels Swift observatory in 2014 April/May. In total, the low-energy X-ray emission dropped by a factor of 100. We have carried out multiwavelength follow-up observations of this narrow-line Seyfert 1 galaxy. Here we present observations with Swift, XMM-Ne…
Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy
Barmby, P.; Maccarone, T. J.; Bahramian, A. +2 more
We present an unprecedented, deep study of the primordial low-mass X-ray binary population in an isolated, lower metallicity environment. We perform follow-up observations of previously identified X-ray binary candidates in the Sculptor Dwarf Galaxy by combining a second Chandra observation with Spitzer and Gemini photometry, as well as Gemini spe…
Characteristics of solar wind rotation
Li, K. J.; Feng, W.
Over 54 yr of hourly mean value of solar wind velocity from 1963 November 27 to 2017 December 31 are used to investigate characteristics of the rotation period of solar wind through autocorrelation analysis. Solar wind of high velocity is found to rotate faster than low-velocity wind, while its rotation rate increases with increasing velocity, but…
Joint cluster reconstructions. Combing free-form lensing and X-rays
Bartelmann, Matthias; Merten, Julian; Hilbert, Stefan +2 more
Context. Galaxy clusters provide a multitude of observational data across wavelengths, and their structure and morphology are of considerable interest in cosmology as well as astrophysics.
Aims: We develop a framework that allows the combination of lensing and non-lensing observations in a free-form and mesh-free approach to infer the project…
The Role of a Tiny Brightening in a Huge Geoeffective Solar Eruption Leading to the St. Patrick’s Day Storm
Hayashi, Keiji; Inoue, Satoshi; Bamba, Yumi
The largest magnetic storm in solar cycle 24 was caused by a fast coronal mass ejection (CME) that was related to a small C9.1 flare that occurred on 2015 March 15 in solar active region (AR) NOAA 12297. The purpose of this study is to understand the onset mechanism of the geoeffective huge solar eruption. We focused on the C2.4 flare that occurre…
2012 TC4 - An unusual fast-rotating PHA with C-type taxonomy
Ip, Wing-Huen; Lin, Zhong-Yi; Ngeow, Chow-Choong
The potentially hazardous asteroid 2012 TC4 made an Earth close approach at a distance of 0.11 lunar distance on 12 October 2017. Photometric observations were carried out between October 11 and October 12 at the Lulin Observatory at short cadence. Data analysis of the light curves shows that this PHA has a fast rotation period of 12.25 min, a lig…
Multifrequency filter search for high redshift sources and lensing systems in Herschel-ATLAS
Bonavera, L.; Diego, J. M.; González-Nuevo, J. +2 more
We present a new catalog of high-redshift candidate Herschel sources. Our sample is obtained after applying a multifrequency filtering method ("matched multifilter"), which is designed to improve the signal-to-noise ratio of faint extragalactic point sources. The method is tested against already-detected sources from the Herschel Astrophysical Ter…
Low-degree gravity field recovery of Phobos based on MEX flyby data
YANG, Xuan; YAN, JianGuo; LIU, ShanHong +3 more