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Now showing items 21-28 of 28
The COMBS Survey II: Distinguishing the Metal-Poor Bulge from the Halo Interlopers
(2021-03-01)
The metal-poor stars in the bulge are important relics of the Milky Way's formation history, as simulations predict that they are some of the oldest stars in the Galaxy. In order to determine if they are truly ancient ...
Observations of magnetic fields surrounding LkHa 101 taken by the BISTRO survey with JCMT-POL-2
(2021-02-10)
We report the first high spatial resolution measurement of magnetic fields surrounding LkHa 101, part of the Auriga- California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk ...
The VANDELS survey: The relation between the UV continuum slope and stellar metallicity in star-forming galaxies at z ∼ 3
(2021-02-04)
The estimate of stellar metallicities (Z∗) of high-z galaxies are of paramount importance in order to understand the complexity of dust effects and the reciprocal interrelations among stellar mass, dust attenuation, stellar ...
A small actively-controlled high-resolution spectrograph based on off-the-shelf components
(2021-02-01)
We present the design and testing of a prototype in-plane echelle spectrograph based on an actively controlled fiber-fed double-pass design. This system aims to be small and efficient with the minimum number of optical ...
Galactic 26Al traces metal loss through hot chimneys
(2021-02-01)
Radioactive 26Al is an excellent tracer for metal ejection in the Milky Way, and can provide a direct constraint on the modelling of supernova feedback in galaxy evolution. Gamma-ray observations of the 26Al decay line ...
A population of hypercompact HII regions identified from young HII regions
(2021-01-22)
Context. The derived physical parameters for young H II regions are normally determined assuming the emission region to be optically thin. However, this assumption is unlikely to hold for young H II regions such as ...
Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys
(2021-01-20)
We analyze the dynamical properties of ∼1500 very metal-poor (VMP; [Fe/H] ≲−2.0) halo stars, based primarily on medium-resolution spectroscopic data from the HK and Hamburg/ESO surveys. These data, collected over the past ...
A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population
(2021-01-04)
We present first results of a four-epoch VLBA survey for nonthermal emission toward all 556 compact radio sources previously identified in a deep VLA survey of the Orion Nebula Cluster (ONC). We identify VLBA counterparts ...