Search Publications
The energy source of the filaments around the giant galaxy NGC 1275
Fabian, A. C.; Ferland, G. J.; Sanders, J. S. +3 more
The brightest galaxy in the nearby Perseus cluster, NGC 1275, is surrounded by a network of filaments. These were first observed through their Hα emission but are now known to have a large molecular component with a total mass approaching 1011 M⊙ of gas. The filaments are embedded in hot intracluster gas and stretch over 80 k…
Molecular gas and star formation in early-type galaxies
Bureau, Martin; Crocker, Alison F.; Young, Lisa M. +1 more
We present new mm interferometric and optical integral-field unit (IFU) observations and construct a sample of 12 elliptical (E) and lenticular (S0) galaxies with molecular gas which have both CO and optical maps. The galaxies contain 2 × 107 to 5 × 109 M⊙ of molecular gas distributed primarily in central discs or …
Evidence for two phases of galaxy formation from radial trends in the globular cluster system of NGC 1407
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +3 more
Here we present the colours of individual globular clusters (GCs) around the massive elliptical galaxy NGC 1407 out to a projected galactocentric radius of 140 kpc or 17 galaxy effective radii (Re). Such data are a proxy for the halo metallicity. We find steep, and similar, metallicity gradients of ∼-0.4 dex dex-1 for both th…
The first release of data from the Herschel ATLAS: the SPIRE images
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +26 more
We have reduced the data taken with the Spectral and Photometric Imaging Receiver (SPIRE) photometer on board the Herschel Space Observatory in the Science Demonstration Phase (SDP) of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We describe the data reduction, which poses specific challenges, both because of the large number …
Galaxy stellar mass functions of different morphological types in clusters, and their evolution between z= 0.8 and 0
Cava, Antonio; Fritz, Jacopo; Dressler, Alan +11 more
We present the galaxy stellar mass function and its evolution in clusters from z∼ 0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (WINGS) (0.04 ≤z≤ 0.07), and the ESO Distant Cluster Survey (EDisCS) (0.4 ≤z≤ 0.8). We investigate the total mass function and find that it evolves noticeably with redshift. The shape at M…
Hα emitters in z∼ 2 protoclusters: evidence for faster evolution in dense environments
Pentericci, L.; Röttgering, H. J. A.; Miley, G. K. +4 more
This is a study of Hα emitters in two dense galaxy protoclusters surrounding radio galaxies at z∼ 2. We show that the protocluster surrounding MRC 1138-262 contains 14 ± 2 times more Hα candidates than the average field (9σ significance), and the z= 2.35 radio galaxy 4C +10.48 is surrounded by 12 ± 2 times more emitters than the field (5σ), so it …
SN 2009md: another faint supernova from a low-mass progenitor
Sollerman, J.; Gal-Yam, A.; Smartt, S. J. +21 more
We present adaptive optics imaging of the core-collapse supernova (SN) 2009md, which we use together with archival Hubble Space Telescope data to identify a coincident progenitor candidate. We find the progenitor to have an absolute magnitude of V=-4.63+0.3-0.4 mag and a colour of V-I= 2.29+0.25-0.39 mag…
Probing cluster formation under extreme conditions: massive star clusters in blue compact galaxies
Östlin, G.; Adamo, A.; Zackrisson, E.
The numerous and massive young star clusters in blue compact galaxies (BCGs) are used to investigate the properties of their hosts. We test whether BCGs follow claimed relations between cluster populations and their hosts, such as the fraction of the total luminosity contributed by the clusters as function of the mean star formation rate (SFR) den…
A SINFONI integral field spectroscopy survey for galaxy counterparts to damped Lyman α systems - I. New detections and limits for intervening and associated absorbers
Bouché, Nicolas; York, Donald G.; Kulkarni, Varsha P. +2 more
Detailed studies of damped and sub-damped Lyman α systems (DLAs), the galaxies probed by the absorption they produce in the spectra of background quasars, rely on identifying the galaxy responsible for the absorber with more traditional methods. Integral field spectroscopy provides an efficient way of detecting faint galaxies near bright quasars, …
Early magnetic B-type stars: X-ray emission and wind properties
Hamann, W. -R.; Oskinova, L. M.; Ignace, R. +3 more
We present a comprehensive study of X-ray emission by, and wind properties of, massive magnetic early B-type stars. Dedicated XMM-Newton observations were obtained for three early-type B-type stars, ξ1 CMa, V2052 Oph and ζ Cas, with recently discovered magnetic fields. We report the first detection of X-ray emission from V2052 Oph and ζ…