Search Publications
Constraining the molecular gas in the environs of a z∼ 8 gamma-ray burst host galaxy
Stanway, Elizabeth R.; Bremer, Malcolm N.; Davies, Luke J. M. +2 more
GRB 090423 is the most distant spectroscopically confirmed source observed in the Universe. Using observations at 37.5 GHz, we place constraints on molecular gas emission in the CO (3-2) line from its host galaxy and immediate environs. The source was not detected either in line emission or in the rest-frame 850-µm continuum, yielding an upp…
A galaxy as the source of a C IV absorption system close to the epoch of reionization
Pettini, Max; Madau, Piero; Díaz, C. Gonzalo +2 more
We find a bright (LUV= 2.5 L★z= 6) Lyα emitter (LAE) at redshift z= 5.719 at a projected distance of 79 physical kpc from a strong triply ionized carbon (C IV) absorption system at redshift z= 5.7238 previously reported in the spectrum of the zem= 6.309 quasi-stellar object SDSS J1030+0524. This is the h…
On the apparent absence of broad iron lines in Seyfert galaxies
Nandra, K.; Bhayani, S.
We present an analysis of XMM-Newton observations of 11 Seyfert galaxies that appear to be missing a broad iron Kα line. These objects represent a challenge to the established paradigm for active galactic nuclei, where a relatively cold accretion disc feeds the central black hole. In that paradigm, X-ray illumination of the accretion disc should l…
The XMM-Newton survey of the Small Magellanic Cloud: XMMU J005011.2-730026 = SXP 214, a Be/X-ray binary pulsar
Pietsch, W.; Haberl, F.; Tiengo, A. +10 more
In the course of the XMM-Newton survey of the Small Magellanic Cloud, a region to the east of the emission nebula N19 was observed in 2009 November. To search for new candidates for high-mass X-ray binaries, the EPIC-pn and EPIC-MOS data of the detected point sources were investigated and their spectral and temporal characteristics identified. A n…
Optical spectral classification of southern ultraluminous infrared galaxies
Lee, Myung Gyoon; Lee, Jong Chul; Hwang, Ho Seong +2 more
We present a study of the optical spectral properties of 115 ultraluminous infrared galaxies (ULIRGs) in the southern sky. Using the optical spectra obtained at the Cerro Tololo Inter-American Observatory (CTIO) 4 -m telescope and provided by the Two-degree Field (2dF) Galaxy Redshift Survey and the Six-degree Field (6dF) Galaxy Survey, we measure…
The dynamics and environmental impact of 3C 452
Hardcastle, M. J.; Croston, J. H.; Shelton, D. L.
We present a detailed analysis of a new XMM-Newton observation of the Fanaroff-Riley type II (FR II) radio galaxy 3C 452 and its environment. We detect X-ray emission from the hot intragroup medium and measure its temperature as well as obtaining the surface brightness and pressure profiles. We provide evidence that 3C 452 is currently heating its…
Testing the fragmentation limit in the Upper Sco association
Hambly, N. C.; Christensen, L.; Lodieu, N. +4 more
We present the results of a deep (J∼ 21 at 5σ) infrared photometric survey of a 0.95-deg2 area in the central region of the Upper Sco association. The photometric observations consist of a deep Y+J-band image obtained with the Wide Field Camera on the United Kingdom Infra-Red Telescope (UKIRT) with part coverage in Z complemented by the…
Spectral components in the bright, long GRB 061007: properties of the photosphere and the nature of the outflow
Larsson, J.; McGlynn, S.; Yamaoka, K. +4 more
We present a time-resolved spectral analysis of the bright, long GRB 061007 (z= 1.261) using Swift and Suzaku data. We find that the prompt emission of the burst can be equally well explained by a photospheric component together with a power law as by a Band function, and we explore the implications of the former model. The photospheric component,…
The planetary nebulae population in the central regions of M32: the SAURON view
Bacon, Roland; Emsellem, Eric; Sarzi, Marc +4 more
Extragalactic planetary nebulae (PNe) are not only useful as distance signposts or as tracers of the dark matter content of their host galaxies, but constitute also good indicators of the main properties of their parent stellar populations. Yet, so far, the properties of PNe in the optical regions of galaxies where stellar population gradients can…
A multifrequency study of the active star-forming complex NGC 6357 - I. Interstellar structures linked to the open cluster Pis 24
Barbá, R.; Arnal, E. M.; Cappa, C. E. +4 more
We investigate the distribution of gas (ionized, neutral atomic and molecular) and interstellar dust in the complex star-forming region NGC 6357 with the goal of studying the interplay between the massive stars in the open cluster Pis 24 and the surrounding interstellar matter.
Our study of the distribution of the ionized gas is based on narr…