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Massive stars in the hinterland of the young cluster, Westerlund 2
(2018-10-21)
An unsettled question concerning the formation and distribution of massive stars is whether they must be born in massive clusters and, if found in less dense environments, whether they must have migrated there. With the ...
Duty cycle of the radio galaxy B2 0258+35
(2018-10-11)
Context. Radio loud active galactic nuclei (AGN) are episodic in nature, cycling through periods of activity and quiescence. The study of this duty cycle has recently gained new relevance because of the importance of AGN ...
A Magnified View of Circumnuclear Star Formation and Feedback around an Active Galactic Nucleus at z = 2.6
(2018-10-10)
We present Atacama Large Millimeter/submillimeter Array observations of an intrinsically radio-bright (L 1.4 GHz = (1.7 ± 0.1) ×10 25 W Hz -1) and infrared luminous (L IR ≈ 10 13 L o) galaxy at z = 2.6. The infrared-to-radio ...
Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge
(2018-10-05)
We use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, ...
AzTEC 1.1 mm observations of high-z protocluster environments : SMG overdensities and misalignment between AGN jets and SMG distribution
(2018-10)
We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar at 0.5 > z > 6.3 acquired with the AzTEC camera mounted at the James Clerk Maxwell Telescope and Atacama Submillimeter Telescope ...
The role of mergers in driving morphological transformation over cosmic time
(2018-10-01)
Understanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is ...
Investigating the cause of the $α\,$-$\,z$ relation
(2018-10-01)
The correlation between radio spectral index and redshift has long been used to identify high-redshift radio galaxies, but its cause is unknown. Traditional explanations invoke either intrinsic relations between spectral ...
The Gaia-ESO Survey : the N/O abundance ratio in the Milky Way
(2018-10-01)
Context. The abundance ratio N/O is a useful tool to study the interplay of galactic processes, for example star formation e ciency, timescale of infall, and outflow loading factor. Aims. We aim to trace log(N/O) versus ...
A direct calibration of the IRX-β relation in Lyman-break Galaxies at z=3-5
(2018-10)
We use a sample of 4209 Lyman-break galaxies (LBGs) at z ≃ 3, 4, and 5 in the UKIRT Infrared Deep Sky Survey Ultra Deep Survey field to investigate the relationship between the observed slope of the stellar continuum ...
On the [α/Fe]-[Fe/H] relations in early-type galaxies
(2018-10-01)
We study how the predicted [α/Fe]-[Fe/H] relations in early-type galaxies vary as functions of their stellar masses, ages, and stellar velocity dispersions, by making use of cosmological chemodynamical simulations with ...