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A Multi-wavelength Analysis of Binary-AGN Candidate PSO J334.2028+01.4075
Gezari, Suvi; Gültekin, Kayhan; Runnoe, Jessie +4 more
We present an analysis of the first Chandra observation of PSO J334.2028+01.4075 (PSO J334), targeted as a binary-AGN candidate based on periodic variations of the optical flux. With no prior targeted X-ray coverage for PSO J334, our new 40 ks Chandra observation allows for the opportunity to differentiate between a single- or binary-AGN system, a…
Multiple kinematical populations in Vela OB2 from Gaia DR1 data
Randich, S.; Micela, G.; Jeffries, R. D. +3 more
Context. Recent results using radial-velocity measurements from the Gaia-ESO Survey have led to the discovery of multiple kinematic populations across the Vela OB2 association. We present here a proper-motion study of the same region.
Aims: Our aim is to test whether or not the radial-velocity populations have a counterpart in proper-motion s…
Uncrowding R 136 from VLT/SPHERE extreme adaptive optics
Avenhaus, H.; Robbe-Dubois, S.; Vakili, F. +12 more
This paper presents the sharpest near-IR images of the massive cluster R 136 to date, based on the extreme adaptive optics of the SPHERE focal instrument implemented on the ESO Very Large Telescope and operated in its IRDIS imaging mode.The crowded stellar population in the core of the R 136 starburst compact cluster remains still to be characteri…
Diffuse radio emission in MACS J0025.4-1222: the effect of a major merger on bulk separation of ICM components
Riseley, C. J.; Scaife, A. M. M.; Wise, M. W. +1 more
Context. Mergers of galaxy clusters are among the most energetic events in the Universe. These events have significant impact on the intra-cluster medium, depositing vast amounts of energy, often in the form of shocks, as well as heavily influencing the properties of the constituent galaxy population. Many clusters have been shown to host large-sc…
A series of shocks and edges in Abell 2219
von der Linden, A.; Allen, S. W.; Russell, H. R. +6 more
We present deep, 170 ks, Chandra X-ray observations of Abell 2219 (z = 0.23), one of the hottest and most X-ray luminous clusters known, and which is experiencing a major merger event. We discover a `horseshoe' of high-temperature gas surrounding the ram-pressure-stripped, bright, hot, X-ray cores. We confirm an X-ray shock front located north-wes…
Triggered massive star formation associated with the bubble Hii region Sh2-39 (N5)
Gromadzki, M.; Borissova, J.; Kuhn, M. A. +3 more
Aims: We perform a multiwavelength analysis of the bubble Hii region Sh2-39 (N5) and its environs with the aim of studying the physical properties of Galactic IR bubbles and exploring their impact in triggering massive star formation.
Methods: To analyze the molecular gas, we used CO(3-2) and HCO+(4-3) line data obtained with …
On the silicate crystallinities of oxygen-rich evolved stars and their mass-loss rates
Gao, Jian; Li, Aigen; Liu, Jiaming +1 more
For decades ever since the early detection in the 1990s of the emission spectral features of crystalline silicates in oxygen-rich evolved stars, there is a long-standing debate on whether the crystallinity of the silicate dust correlates with the stellar mass-loss rate. To investigate the relation between the silicate crystallinities and the mass-…
Integral Field Spectroscopy of Balmer-dominated Shocks in the Magellanic Cloud Supernova Remnant N103B
Ghavamian, Parviz; Williams, Brian J.; Winkler, P. Frank +4 more
We present results of integral field spectroscopy of Balmer-dominated shocks in the LMC supernova remnant (SNR) N103B, carried out using the Wide Field Integral Spectrograph (WiFeS ) on the 2.3 m telescope at the Siding Spring Observatory in Australia. Existing X-ray studies of N103B have indicated an SN Ia origin. Radiative shock emission from cl…
Solar Wind Interaction and Atmospheric Escape
Bougher, Stephen W.; Brain, David A.; Barabash, Stanislav +3 more
Detection of Enhanced Central Mass-to-light Ratios in Low-mass Early-type Galaxies: Evidence for Black Holes?
Pechetti, Renuka; Strader, Jay; Mieske, Steffen +4 more
We present dynamical measurements of the central mass-to-light ratio (M/L) of a sample of 27 low-mass early-type {{ATLAS}}3{{D}} galaxies. We consider all {{ATLAS}}3{{D}} galaxies with 9.7 < log({M}\star /{M}⊙ ) < 10.5 in our analysis, selecting out galaxies with available high-resolution Hubble Sp…