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Monitoring Observatinos of H2O and SiO Masers Toward Post-AGB Stars
Kim, Jaeheon; Cho, Se-Hyung; Yoon, Dong-Hwan
The role of ionospheric O+ outflow in the generation of earthward propagating plasmoids
Lyon, J. G.; Zhang, B.; Ouellette, J. E. +2 more
Earthward propagating plasmoids in the Earth's magnetotail have been observed by satellites. Using a multifluid global magnetosphere simulation, earthward propagating plasmoids are reproduced when ionospheric O+ outflow is included in the global simulation. Controlled simulations show that without ionospheric outflow, the plasmoids gene…
Phase relations between total solar irradiance and the Mg II index
Li, K. J.; Xu, J. C.; Feng, W. +1 more
The Mg II index is usually used to represent the brightening contribution to total solar irradiance (TSI) by solar bright structures, such as faculae and network. In order to understand variations of TSI, phase relations of TSI and the chromospheric Mg II index is investigated on time-scales of one year and longer. The NOAA daily Mg II index at th…
Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
Iwasawa, K.; Fabian, A. C.; Reynolds, C. S. +3 more
We report on strong X-ray variability and the Fe K-band spectrum of the Seyfert galaxy IRAS 18325-5926 obtained from the 2001 XMM-Newton EPIC pn observation with a duration of ~120 ks. While the X-ray source is highly variable, the 8-10 keV band shows larger variability than that of the lower energies. Amplified 8-10 keV flux variations are associ…
Warm ISM in the Sagittarius A Complex. I. Mid-J CO, atomic carbon, ionized atomic carbon, and ionized nitrogen sub-mm/FIR line observations with the Herschel-HIFI and NANTEN2/SMART telescopes
Stutzki, J.; Güsten, R.; Requena-Torres, M. A. +3 more
Aims: We investigate the spatial and spectral distribution of the local standard of rest (LSR) velocity resolved submillimetre emission from the warm (25-90 K) gas in the Sgr A Complex, located in the Galactic centre.
Methods: We present large-scale submillimetre heterodyne observations towards the Sgr A Complex covering ~300 arcmin…
Many new variable stars discovered in the core of the globular cluster NGC 6715 (M 54) with EMCCD observations
Surdej, J.; Snodgrass, C.; Horne, K. +39 more
Context. We show the benefits of using electron-multiplying CCDs and the shift-and-add technique as a tool to minimise the effects of atmospheric turbulence, such as blending between stars in crowded fields, and to avoid saturated stars in the fields observed. We intend to complete, or improve on, the census of the variable star population in glob…
X-Ray Afterglow of Swift J1644+57: A Compton Echo?
Cheng, K. S.; Kong, Albert K. H.; Chernyshov, D. O. +2 more
Swift, Chandra, and XMM have found a weak but nearly constant X-ray component from Swift J1644+57 that appeared at ∼500 days and was visible at least until ∼1400 days after the stellar capture, which cannot be explained by standard tidal disruption theories. We suggest that this X-ray afterglow component may result from the Thomson scattering betw…
Multiwavelength study of RX J2015.6+3711: a magnetic cataclysmic variable with a 2-h spin period
Campana, S.; de Martino, D.; Rea, N. +4 more
The X-ray source RX J2015.6+3711 was discovered by ROSAT in 1996 and recently proposed to be a cataclysmic variable (CV). Here, we report on an XMM-Newton observation of RX J2015.6+3711 performed in 2014, where we detected a coherent X-ray modulation at a period of 7196 ± 11 s and discovered other significant (>6σ) small-amplitude periodicities…
Galaxy Infall by Interacting with Its Environment: A Comprehensive Study of 340 Galaxy Clusters
Gandhi, Poshak; Makishima, Kazuo; Nakazawa, Kazuhiro +7 more
To study systematically the evolution of the angular extents of the galaxy, intracluster medium (ICM), and dark matter components in galaxy clusters, we compiled the optical and X-ray properties of a sample of 340 clusters with redshifts <0.5, based on all the available data from the Sloan Digital Sky Survey and Chandra/XMM-Newton. For each clu…
Method for improving line flux and redshift measurements with narrowband filters
Milvang-Jensen, B.; Fynbo, J. P. U.; Nilsson, K. K. +5 more
Context. High redshift star-forming galaxies are discovered routinely because of a flux excess in narrowband filters caused by an emission line. In most cases, the width of such filters is broader than typical line widths, and the throughput of the filters varies substantially within the bandpass. This leads to substantial uncertainties in redshif…