Search Publications
COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster
Thomson, A. P.; Dannerbauer, H.; Seymour, N. +24 more
This paper presents the results of 475h of interferometric observations with the Australia Telescope Compact Array towards the Spiderweb protocluster at z=2.16. We search for large, extended molecular gas reservoirs among 46 previously detected CO(1-0) emitters, employing a customised method we developed. Based on the CO emission images and positi…
Cloudlet capture model for the accretion streamer onto the disc of DG Tau
Codella, Claudio; Garufi, Antonio; Podio, Linda +2 more
DG Tau is a nearby T Tauri star associated with a collimated jet, a circumstellar disc, and a streamer a few hundred au long. The streamer connects to the disc at ~50 au from DG Tau. At this location SO emission is observed, likely due to the release of sulphur from dust grains caused by the shock of the impact of the accretion streamer onto the d…
AT2023fhn (the Finch): a luminous fast blue optical transient at a large offset from its host galaxy
Groot, P. J.; Wiersema, K.; Levan, A. J. +8 more
Luminous fast blue optical transients (LFBOTs) - the prototypical example being AT 2018cow - are a rare class of events whose origins are poorly understood. They are characterized by rapid evolution, featureless blue spectra at early times, and luminous X-ray and radio emission. LFBOTs thus far have been found exclusively at small projected offset…
Multi-epoch sampling of the radio star population with the Australian SKA Pathfinder
Kaplan, David L.; Lenc, Emil; Pritchard, Joshua +5 more
The population of radio-loud stars has to date been studied primarily through either targeted observations of a small number of highly active stars or wide-field, single-epoch surveys that cannot easily distinguish stellar emission from background extragalactic sources. As a result it has been difficult to constrain population statistics such as t…
Cosmic evolution early release science survey (CEERS): multiclassing galactic dwarf stars in the deep JWST/NIRCam
Papovich, Casey; Finkelstein, Steven L.; Burgarella, Denis +20 more
Low-mass (sub)stellar objects represent the low end of the initial mass function, the transition to free-floating planets and a prominent interloper population in the search for high-redshift galaxies. To what accuracy can photometry only classify these? JWST/NIRCam has several advantages over Hubble Space Telescope (HST)/WFC3 near-infrared (NIR):…
JWST MIRI and NIRCam unveil previously unseen infrared stellar populations in NGC 6822
Temim, Tea; Hirschauer, Alec S.; Boyer, Martha L. +9 more
NGC 6822 is a nearby (~490 kpc) non-interacting low-metallicity (0.2 Z⊙) dwarf galaxy which hosts several prominent H II regions, including sites of highly embedded active star formation. In this work, we present an imaging survey of NGC 6822 conducted with the Near Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI) onboard JWS…
The outer low-α disc of the Milky Way - I: evidence for the first pericentric passage of Sagittarius?
Huang, Yang; Fragkoudi, Francesca; Ciucă, Ioana +1 more
Phase-space data, chemistry, and ages together reveal a complex structure in the outer low-α disc of the Milky Way. The age-vertical velocity dispersion profiles beyond the Solar Neighbourhood show a jump at 6 Gyr for stars beyond the Galactic plane. Stars older than 6 Gyr are significantly hotter than younger stars. The chemistry and age histogra…
Survey of gravitationally lensed objects in HSC imaging (SuGOHI) - IX. Discovery of strongly lensed quasar candidates
Oguri, Masamune; Wong, Kenneth C.; Suyu, Sherry H. +7 more
We report the discovery of new lensed quasar candidates in the imaging data of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) Data Release 4, covering $1\, 310\deg ^2$ of the sky with median seeing in the i band of ≈0.6 arcsec. In addition to two catalogues of Million Quasars Catalog v7.2 and AllWISE Catalog of Mid-Infra Red Active Galac…
The detection of polarized X-ray emission from the magnetar 1E 2259+586
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +98 more
We report on IXPE, NICER, and XMM-Newton observations of the magnetar 1E 2259+586. We find that the source is significantly polarized at about or above 20 per cent for all phases except for the secondary peak where it is more weakly polarized. The polarization degree is strongest during the primary minimum which is also the phase where an absorpti…
An optical gamma-ray burst catalogue with measured redshift - I. Data release of 535 gamma-ray bursts and colour evolution
Butler, N. R.; Cenko, S. B.; Lee, W. H. +49 more
We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). We include 64813 observations of 535 events (including upper limits) from 28 February 1997 to 18 August 2023. We also present a user-friendly web tool grbLC which allows users to visualize photometry, coordinates, redshift, host galaxy extinction, …