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Discovery of annular X-ray emission centered on MAXI J1421-613: Dust-scattering X-rays?
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo
We report the discovery of an annular emission of $\sim\!\! {3^{\prime }}\!-\!{9^{\prime }}$ radius around the center of a transient source, the X-ray burster MAXI J1421-613, in the Suzaku follow-up analysis. The spectrum of the annular emission shows no significant emission-line structure, and is well explained by an absorbed power-law model with…
DX Cygni: A triple system with mass transfer
Wolf, M.; Mašek, M.; Kučáková, H. +2 more
A dozen of new precise times of eclipses were measured for the eclipsing binary DX Cygni as a part of our long-term observational project for studying neglected eclipsing binaries with a short orbital period. Based on a current O - C diagram, we found for the first time that its period is increasing (dP / P = 1.68 ×10-7 day/years) and t…
A GALEX far-ultraviolet study of quasi-coeval samples of red giants
Smith, Graeme H.; Cochrane, Kevin M.
Samples of red giant branch (RGB) stars have been compiled from the literature for seven moving groups, and searches made for both GALEX FUV and Johnson
The Subjectivity in Identification of Martian Channel Networks and Its Implication for Citizen Science Projects
Jones, M.; Bahia, R. S.
The Martian surface is incised by numerous valley networks, which indicate the planet experienced sustained widespread flowing water in the past (e.g. Carr in Water on Mars, Oxford University Press, New York, 1996; Phil Trans R Soc A 370:2193–2212, 2012. https://doi.org/10.1098/rsta.2011.0500). Examining the distribution and geometries of these va…
Conditions for galaxy quenching at 0.5 < z < 2.5 from CANDELS: compact cores and environment
Gu, Qiu-Sheng; Gu, Yi-Zhou; Ge, Xue +2 more
We investigate two classes of conditions for galaxy quenching at 0.5 < z < 2.5 based on the structural scaling relations of galaxies in the five Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) fields: the formation of a compact core and the environment. We confirm that in the entire redshift range, massive quiescent …
Some thoughts on emission-line spectroscopy
Judge, Philip G.
The interpretation of emission lines formed in large astrophysical plasmas such as the solar atmosphere faces many challenges. Relatively simple line-ratio estimates of physical parameters, while appealing, are heavily laden with assumptions. In practical cases, some critical assumptions are neither defensible from first principles, nor testable b…
On the origin of X-ray oxygen emission lines in obscured AGN
Bianchi, S.; Guainazzi, M.; García, F. +4 more
We present the Catalogue of High Resolution Spectra of Obscured Sources (CHRESOS) from the XMM-Newton Science Archive. It comprises the emission-line luminosities of H- and He-like transitions from C to Si, and the Fe 3C and Fe 3G L-shell ones. Here, we concentrate on the soft X-ray O VII (f) and O VIII Lyα emission lines to shed light on to the p…
HD 165054: An Astrometric Calibration Field for High-contrast Imagers in Baade's Window
Duchêne, Gaspard; Esposito, Thomas M.; Hom, Justin +51 more
We present a study of the HD 165054 astrometric calibration field that has been periodically observed with the Gemini Planet Imager (GPI). HD 165054 is a bright star within Baade's Window, a region of the galactic plane with relatively low extinction from interstellar dust. HD 165054 was selected as a calibrator target due to the high number densi…
Catalog of Solar Failed Eruptions and Other Dynamic Features Registered by SDO/AIA
Mrozek, Tomasz; Kołomański, Sylwester; Stęślicki, Marek +1 more
In this paper we present our attempt to constrain the first catalog of solar failed eruptions. We used our automatic algorithm that is able to search for dynamic features in the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) database. We ran the algorithm on the entire SDO/AIA 171 Å data set. For the time interval from 2010 Ma…
A NICER View of Spectral and Profile Evolution for Three X-Ray-emitting Millisecond Pulsars
Enoto, Teruaki; Bogdanov, Slavko; Ray, Paul S. +17 more
We present two years of Neutron star Interior Composition Explorer (NICER) X-ray observations of three energetic rotation-powered millisecond pulsars (MSPs): PSRs B1937+21, B1821-24, and J0218+4232. We fit Gaussians and Lorentzians to the pulse profiles for different energy sub-bands of the soft X-ray regime to measure the energy dependence of pul…