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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
Determination of Potassium Abundances for Giant and Dwarf Stars in the Galactic Disk
Takeda, Yoichi
An extensive study on the potassium abundances of late-type stars was carried out by applying the non-LTE spectrum-fitting analysis to the K I resonance line at 7698.96Å to a large sample of 160 FGK dwarfs and 328 late-G/early-K giants (including 89 giants in the Kepler field with seismologically known ages) belonging to the disk population (‑1≤[F…
The Re-Processing Results of Photographic Observations of Asteroids with GAIA Catalog at the Mao Nas of Ukraine
Andruk, V. M.; Shatokhina, S. V.; Kazantseva, L. V.
In total, about 4,500 asteroid po-sitions were determined from photographic observations conducted at the MAO NAS of Ukraine in 1952-1996. These are the early positions of the selected minor planets, mostly bright, the observations of which were initiated by the founders of the ORBITA observational program and were made in 1952-1986. The second la…
Clustering of extremely red objects in the AKARI NEP-deep field
Goto, Tomotsugu; Pearson, Chris; Jeong, Woong-Seob +6 more
We study the clustering property of extremely red objects (EROs) using Canada-France-Hawaii Telescope (CFHT) surveys with 0.55 deg2 in the AKARI north ecliptic pole (NEP) deep field. EROs are selected by the color criterion of r' - Ks > 3.66, which is equivalent to (R - Ks)Vega > 5. We conducted th…
The evolving X-ray spectrum of active galactic nuclei: Evidence for an increasing reflection fraction with redshift
Ballantyne, D. R.; Avirett-Mackenzie, M. S.
The cosmic X-ray background (XRB) spectrum and active galaxy number counts encode essential information about the spectral evolution of active galactic nuclei (AGNs) and have been successfully modelled by XRB synthesis models for many years. Recent measurements of the 8-24 keV AGN number counts by NuSTAR and Swift-BAT are unable to be simultaneous…
Peculiar Outbursts of an Ultra-luminous Source: Likely Signs of an Aperiodic Disk-wind
Stiele, H.; Kong, A. K. H.
The metal-rich globular cluster RZ 2109 in the massive Virgo elliptical galaxy NGC 4472 (M49) harbors the ultra-luminous X-ray source XMMU 122939.7+075333. Previous studies showed that this source varies between bright and faint phases on timescales of just a few hours. Here, we report the discovery of two peculiar X-ray bursting events that last …