Search Publications
Spitzer Space Telescope spectra of post-AGB stars in the Large Magellanic Cloud - polycyclic aromatic hydrocarbons at low metallicities
Sahai, R.; Hony, S.; Ita, Yoshifusa +26 more
This paper reports variations of polycyclic aromatic hydrocarbons (PAHs) features that were found in Spitzer Space Telescope spectra of carbon-rich post-asymptotic giant branch (post-AGB) stars in the Large Magellanic Cloud (LMC). The paper consists of two parts. The first part describes our Spitzer spectral observing programme of 24 stars includi…
On the progenitor of the Type IIP SN 2013ej in M74.
Gal-Yam, A.; Inserra, C.; Smartt, S. J. +10 more
We use natural seeing imaging of SN 2013ej in M74 to identify a progenitor candidate in archival Hubble Space Telescope (HST) + Advanced Camera for Survey images. We find a source coincident with the supernova (SN) in the F814W filter within the total 75 mas (∼3 pc astrometric uncertainty; however, the position of the progenitor candidate in conte…
The SLUGGS survey: the globular cluster systems of three early-type galaxies using wide-field imaging
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +3 more
We present the results from a wide-field imaging study of globular cluster (GC) systems in three early-type galaxies. Combinations of Subaru/Suprime-Cam, Canada-France-Hawaii Telescope/MegaCam and Hubble Space Telescope/Wide Field Planetary Camera 2/Advanced Camera for Surveys data were used to determine the GC system properties of three highly fl…
The halo+cluster system of the Galactic globular cluster NGC 1851
Weiss, A.; Milone, A. P.; Marino, A. F. +17 more
NGC 1851 is surrounded by a stellar component that extends more than 10 times beyond the tidal radius. Although the nature of this stellar structure is not known, it has been suggested to be a sparse halo of stars or associated with a stellar stream. We analyse the nature of this intriguing stellar component surrounding NGC 1851 by investigating i…
A z = 2.5 protocluster associated with the radio galaxy MRC 2104-242: star formation and differing mass functions in dense environments
Kurk, J. D.; Rigby, E. E.; Hatch, N. A. +2 more
We present results from a narrow-band survey of the field around the high-redshift radio galaxy MRC 2104-242. We have selected Hα emitters in a 7 arcmin2 field and compared the measured number density with that of a field sample at similar redshift. We find that MRC 2104-242 lies in an overdensity of galaxies that is 8.0 ± 0.8 times the…
A late-time view of the progenitors of five Type IIP supernovae
Mattila, Seppo; Maund, Justyn R.; Reilly, Emma
The acquisition of late-time imaging is an important step in the analysis of pre-explosion observations of the progenitors of supernovae. We present late-time Hubble Space Telescope Advanced Camera for Surveys Wide-Field Channel observations of the sites of five Type IIP SNe: 1999ev, 2003gd, 2004A, 2005cs and 2006my. Observations were conducted us…
A propeller scenario for the gamma-ray emission of low-mass X-ray binaries: the case of XSS J12270-4859
Torres, D. F.; Li, Jian; Papitto, A.
XSS J12270-4859 is the only low-mass X-ray binary (LMXB) with a proposed persistent gamma-ray counterpart in the Fermi-Large Area Telescope domain, 2FGL 1227.7-4853. Here, we present the results of the analysis of recent INTEGRAL observations, aimed at assessing the long-term variability of the hard X-ray emission, and thus the stability of the ac…
The colour distribution of galaxies at redshift five
Ferguson, H. C.; Finkelstein, S. L.; Bowler, R. A. A. +11 more
We present the results of a study investigating the rest-frame ultraviolet (UV) spectral slopes of redshift z ≈ 5 Lyman-break galaxies (LBGs). By combining deep Hubble Space Telescope imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey and Hubble Ultra-Deep Field with ground-based imaging from the UKIRT Infrared Deep Sky …
From voids to Coma: the prevalence of pre-processing in the local Universe
Gutermuth, Robert A.; Cybulski, Ryan; Yun, Min S. +1 more
We examine the effects of pre-processing across the Coma Supercluster, including 3505 galaxies over ∼500 deg2, by quantifying the degree to which star-forming (SF) activity is quenched as a function of environment. We characterize environment using the complementary techniques of Voronoi Tessellation, to measure the density field, and t…
CO(1-0) line imaging of massive star-forming disc galaxies at z=1.5-2.2
Daddi, E.; Walter, F.; Riechers, D. A. +7 more
We present detections of the CO(J = 1-0) emission line in a sample of four massive star-forming galaxies at z ∼ 1.5-2.2 obtained with the Karl G. Jansky Very Large Array. Combining these observations with previous CO(2-1) and CO(3-2) detections of these galaxies, we study the excitation properties of the molecular gas in our sample sources. We fin…