Search Publications
The formation of NGC 3603 young starburst cluster: `prompt' hierarchical assembly or monolithic starburst?
Kroupa, Pavel; Banerjee, Sambaran
The formation of very young massive clusters or `starburst' clusters is currently one of the most widely debated topic in astronomy. The classical notion dictates that a star cluster is formed in situ in a dense molecular gas clump. The stellar radiative and mechanical feedback to the residual gas energizes the latter until it escapes the system. …
Quenching and morphological transformation in semi-analytic models and CANDELS
Papovich, Casey; Barro, Guillermo; Bell, Eric F. +9 more
We examine the spheroid growth and star formation quenching experienced by galaxies since z ∼ 3 by studying the evolution with redshift of the quiescent and spheroid-dominated fractions of galaxies from the CANDELS (Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey) and GAMA (Galaxy and Mass Assembly) surveys. We compare the observed …
On the importance of using appropriate spectral models to derive physical properties of galaxies at 0.7 < z < 2.8
Charlot, Stéphane; Maseda, Michael V.; van Dokkum, Pieter G. +14 more
Interpreting observations of distant galaxies in terms of constraints on physical parameters - such as stellar mass (M★), star formation rate (SFR) and dust optical depth ({hat{τ}V}) - requires spectral synthesis modelling. We analyse the reliability of these physical parameters as determined under commonly adopted `classical…
Far-ultraviolet morphology of star-forming filaments in cool core brightest cluster galaxies
Fabian, A. C.; Li, Y.; Combes, F. +17 more
We present a multiwavelength morphological analysis of star-forming clouds and filaments in the central (≲50 kpc) regions of 16 low-redshift (z < 0.3) cool core brightest cluster galaxies. New Hubble Space Telescope imaging of far-ultraviolet continuum emission from young (≲10 Myr), massive (≳5 M⊙) stars reveals filamentary and clump…
QUIJOTE scientific results - I. Measurements of the intensity and polarisation of the anomalous microwave emission in the Perseus molecular complex
Ashdown, M.; Barreiro, R. B.; Dickinson, C. +28 more
In this paper, we present Q-U-I JOint Tenerife Experiment (QUIJOTE) 10-20 GHz observations (194 h in total over ≈250 deg2) in intensity and polarisation of G159.6-18.5, one of the most widely studied regions harbouring anomalous microwave emission (AME). By combining with other publicly available intensity data, we achieve the most prec…
Directly imaging damped Ly α galaxies at z > 2 - III. The star formation rates of neutral gas reservoirs at z ∼ 2.7
Prochaska, J. Xavier; Rafelski, Marc; Fumagalli, Michele +2 more
We present results from a survey designed to probe the star formation properties of 32 damped Lyman α systems (DLAs) at z ∼ 2.7. By using the `double-DLA' technique that eliminates the glare of the bright background quasars, we directly measure the rest-frame far-ultraviolet flux from DLAs and their neighbouring galaxies. At the position of the ab…
Discovery of an ∼2-h high-frequency X-ray QPO and iron Kα reverberation in the active galaxy MS 2254.9-3712
Fabian, A. C.; Pinto, C.; Lohfink, A. +5 more
We report the discovery of an ∼1.5 × 10-4 Hz (∼2 h) X-ray quasi-periodic oscillation (QPO) in the active galaxy MS 2254.9-3712, using an ∼70 ks XMM-Newton observation. The QPO is significantly detected (∼3.3σ) in the 1.2-5.0 keV band only, connecting its origin with the primary X-ray power-law continuum. We detect a highly coherent soft…
Discovery of H I gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder
Forsyth, R.; Sault, R. J.; Heywood, I. +100 more
We report the discovery of a new 21-cm H I absorption system using commissioning data from the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.5-1015.5 MHz band of ASKAP we were able to conduct a blind search for the 21-cm line in a continuous redshift range between z = 0.4 and 1.0, which …
The link between accretion mode and environment in radio-loud active galaxies
Hardcastle, M. J.; Croston, J. H.; Kraft, R. P. +3 more
The interactions between radio-loud AGN and their environments play an important rôle in galaxy and cluster evolution. Recent work has demonstrated fundamental differences between high- and low-excitation radio galaxies (HERGs and LERGs), and shown that they may have different relationships with their environments. In the Chandra Large Project ERA…
Star formation properties of sub-mJy radio sources
Berta, S.; Lutz, D.; Andreani, P. +8 more
We investigate the star formation properties of ∼800 sources detected in one of the deepest radio surveys at 1.4 GHz. Our sample spans a wide redshift range (∼0.1-4) and about four orders of magnitude in star formation rate (SFR). It includes both star-forming galaxies (SFGs) and active galactic nuclei (AGNs), further divided into radio-quiet (RQ)…