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SHALOS: Statistical Herschel-ATLAS lensed objects selection
Bonavera, L.; González-Nuevo, J.; Herranz, D. +7 more
Context. The statistical analysis of large sample of strong lensing events can be a powerful tool to extract astrophysical or cosmological valuable information. Their selection using submillimetre galaxies has been demonstrated to be very effective with more than ∼200 proposed candidates in the case of Herschel-ATLAS data and several tens in the c…
Properties of High-Energy Solar Particle Events Associated with Solar Radio Emissions
Valtonen, Eino; Pohjolainen, Silja; Ameri, Dheyaa
We have analysed 58 high-energy proton events and 36 temporally related near-relativistic electron events from the years 1997 - 2015 for which the velocity dispersion analysis of the first-arriving particles gave the apparent path lengths between 1 and 3 AU. We investigated the dependence of the characteristics of the proton events on the associat…
A magnetic white dwarf with five H α components
Bergeron, P.; Kilic, Mukremin; Vanderbosch, Z. +3 more
G183-35 is an unusual white dwarf that shows an H α line split into five components, instead of the usual three components seen in strongly magnetic white dwarfs. Potential explanations for the unusual set of lines include a double degenerate system containing two magnetic white dwarfs and/or rotational modulation of a complex magnetic field struc…
An Efficient Spectral Selection of M Giants Using XGBoost
Luo, A. -Li; Yi, Zhenping; Chen, Zesheng +4 more
In optical bands, the spectra of M giants often overlap with those of M dwarfs due to their similarities, especially for low or moderate resolution spectra. Traditionally, several feature indices, such as Na I, CaH, TiO5, and K I, are used to distinguish between M giants and M dwarfs. However, these features are selected by experience based on a s…
Vertical position of the Sun with γ-rays
Siegert, Thomas
We illustrate a method for estimating the vertical position of the Sun above the Galactic plane by γ-ray observations. Photons of γ-ray wavelengths are particularly well suited for geometrical and kinematic studies of the Milky Way because they are not subject to extinction by interstellar gas or dust. Here, we use the radioactive decay line of
Comparison of the Asteroseismic Mass Scale of Red Clump Giants with Photometric Mass Estimates
Pinsonneault, Marc H.; Terndrup, Donald M.; Chung, Chul +1 more
Asteroseismology can provide joint constraints on masses and radii of individual stars. While this approach has been extensively tested for red giant branch (RGB) stars, it has been more difficult to test for helium core-burning red clump (RC) giants because of the lack of fundamental calibrators. To provide independent mass estimates, we utilize …
SOFIA/FORCAST Observations of the Sgr A-H H II Regions: Using Dust Emission to Elucidate the Heating Sources
Morris, M. R.; Mills, E. A. C.; Lau, R. M. +2 more
The Sgr A-H H II regions are a collection of sources that may represent one of the most recent sites of star formation in the Galactic center (GC). Examining these H II regions provides important information on the prevalence and distribution of massive stars in the region and may provide clues on the origin of other massive field stars throughout…
MUSE-AO view of the starburst-AGN connection: NGC 7130
Knapen, J. H.; Comerón, S.; Seidel, M. K.
We present the discovery of a small kinematically decoupled core of 0.″2 (60 pc) in radius as well as an outflow jet in the archetypical AGN-starburst "composite" galaxy NGC 7130 from integral field data obtained with the adaptive optics-assisted MUSE-NFM instrument on the VLT. Correcting the already good natural seeing at the time of our science …
Discovery of recombining plasma inside the extended gamma-ray supernova remnant HB9
Fukui, Y.; Sano, H.; Sezer, A. +2 more
We present the results from the Suzaku X-ray Imaging Spectrometer observation of the mixed-morphology supernova remnant (SNR) HB9 (G160.9+2.6). We discovered recombining plasma (RP) in the western Suzaku observation region and the spectra here are well described by a model having collisional ionization equilibrium (CIE) and RP components. On the o…
Modeling the Spatial Distribution and Origin of CO Gas in Debris Disks
Gorti, Uma; Carpenter, John M.; Hales, A. S. +2 more
The detection of gas in debris disks raises the question of whether this gas is a remnant from the primordial protoplanetary phase, or released by the collision of secondary bodies. In this paper we analyze ALMA observations at 1″-1.″5 resolution of three debris disks where the 12CO(2-1) rotational line was detected: HD 131835, HD 13881…