Search Publications
SHARP - VI. Evidence for CO (1-0) molecular gas extended on kpc-scales in AGN star-forming galaxies at high redshift
Vegetti, S.; McKean, J. P.; Rizzo, F. +8 more
We present a study of the stellar host galaxy, CO (1-0) molecular gas distribution and AGN emission on 50-500 pc-scales of the gravitationally lensed dust-obscured AGN MG J0751+2716 and JVAS B1938+666 at redshifts 3.200 and 2.059, respectively. By correcting for the lensing distortion using a grid-based lens modelling technique, we spatially locat…
Abundance analyses of Li-enriched and normal giants in the GALAH survey
Lambert, David L.; Deepak; Reddy, Bacham E.
Compositions of lithium-enriched and normal giants among the GALAH survey are compared. Except for Li, the only detectable abundance difference between lithium-enriched and normal giants among the investigated elements from carbon to europium occurs for carbon. Among Li-rich giants with A(Li) = 1.8-3.1, the C deficiency is very similar to that rep…
Abell 30 - A binary central star among the born-again planetary nebulae
Jones, David; Jacoby, George H.; Hillwig, Todd C.
Eight planetary nebulae have been identified as 'born-again', a class of object typified by knotty secondary ejecta having low masses (${\sim}10^{-4}$ M⊙) with nearly no hydrogen. Abell 30, the archetype of the class, also belongs to a small subset of planetary nebulae that exhibit extreme abundance discrepancy factors (where Abell 30 i…
The accretion history of high-mass stars: an ArTéMiS pilot study of infrared dark clouds
Roussel, H.; Arzoumanian, D.; Könyves, V. +14 more
The mass growth of protostars is a central element to the determination of fundamental stellar population properties such as the initial mass function. Constraining the accretion history of individual protostars is therefore an important aspect of star formation research. The goal of the study presented here is to determine whether high-mass (prot…
Extending the Breakthrough Listen nearby star survey to other stellar objects in the field
Garrett, M. A.; Wlodarczyk-Sroka, B. S.; Siemion, A. P. V.
We extend the source sample recently observed by the Breakthrough Listen (BL) Initiative by including additional stars (with parallaxes measured by Gaia) that also reside within the full width at half-maximum of the Green Bank 100-m Telescope and Parkes radio telescope target fields. These stars have estimated distances as listed in the extensions…
ZTF J1901+5309: a 40.6-min orbital period eclipsing double white dwarf system
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +17 more
The Zwicky Transient Facility has begun to discover binary systems with orbital periods that are less than 1 h. Combined with dedicated follow-up systems, which allow for high-cadence photometry of these sources, systematic confirmation and characterization of these sources are now possible. Here, we report the discovery of ZTF J190125.42+530929.5…
A new model for including galactic winds in simulations of galaxy formation - I. Introducing the Physically Evolved Winds (PhEW) model
Davé, Romeel; Weinberg, David H.; Scannapieco, Evan +5 more
The propagation and evolution of cold galactic winds in galactic haloes is crucial to galaxy formation models. However, modelling of this process in hydrodynamic simulations of galaxy formation is oversimplified owing to a lack of numerical resolution and often neglects critical physical processes such as hydrodynamic instabilities and thermal con…
Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A
Umana, G.; Fossati, L.; Loru, S. +20 more
We present new ATCA multiwavelength radio measurements (range 2.1-21.2 GHz) of the early-type magnetic star ρ Oph A, performed in 2019 March during three different observing sessions. These new ATCA observations evidence a clear rotational modulation of the stellar radio emission and the detection of coherent auroral radio emission from ρ Oph A at…
Considerations for atmospheric retrieval of high-precision brown dwarf spectra
Madhusudhan, Nikku; Piette, Anjali A. A.
Isolated brown dwarfs provide remarkable laboratories for understanding atmospheric physics in the low-irradiation regime, and can be observed more precisely than exoplanets. As such, they provide a glimpse into the future of high-signal-to-noise ratio (SNR) observations of exoplanets. In this work, we investigate several new considerations that a…
A successful search for intervening 21 cm H I absorption in galaxies at 0.4 < z <1.0 with the Australian square kilometre array pathfinder (ASKAP)
Ellison, Sara L.; Koribalski, Bärbel S.; Lagos, Claudia del P. +6 more
We have used the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope to search for intervening 21 cm neutral hydrogen (H I) absorption along the line of sight to 53 bright radio continuum sources. Our observations are sensitive to H I column densities typical of Damped Lyman Alpha absorbers (DLAs) in cool gas with an H I spin temp…