Search Publications
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)…
Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies
Ivison, R. J.; Fritz, J.; Hardcastle, M. J. +6 more
We examine the relationship between star formation and active galactic nuclei (AGN) activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-Astrophysical Terahertz Large Area Survey fields. Radio-loud AGN are classified as high-excitation and low-excitation radio galaxies using their emi…
Helium and multiple populations in the massive globular cluster NGC 6266 (M 62)
Milone, A. P.
Recent studies suggest that the helium content of multiple stellar populations in globular clusters (GCs) is not uniform. The range of helium varies from cluster to cluster with more massive GCs having, preferentially, large helium spread. GCs with large helium variations also show extended-blue horizontal branch (HB). I exploit Hubble Space Teles…