Search Publications
The detection of FIR emission from high-redshift star-forming galaxies in the ECDF-S
Bremer, M. N.; Lehnert, M. D.; Davies, L. J. M. +1 more
We have used the Large Apex Bolometer Camera Survey of the Extended Chandra Deep Field South to investigate rest-frame far-infrared (FIR) emission from typical star-forming systems (Lyman-break galaxies, LBGs, and Lyman α emitters, LAEs) at redshift 3, 4, 4.5 and 5 (922, 68, 46 and 20 sources, respectively). We initially concentrate on LBGs at z ∼…
Characterizing shock waves in molecular outflow sources: the interpretation of Herschel and Spitzer observations of NGC 1333 IRAS 4B
Pineau des Forêts, G.; Flower, D. R.
We have computed C- and J-type models of shock waves in molecular outflow sources. In addition to the (optically thin) emission line spectrum of molecular hydrogen, the spectra of CO, OH, SiO, H2O and NH3 were computed by means of the large velocity gradient approximation. We find that the intensities of the OH lines are part…
Alignment of the angular momentum vectors of planetary nebulae in the Galactic Bulge
Zijlstra, A. A.; Rees, B.
We use high-resolution Hα images of 130 planetary nebulae (PNe) to investigate whether there is a preferred orientation for PNe within the Galactic Bulge. The orientations of the full sample have a uniform distribution. However, at a significance level of 0.01, there is evidence for a non-uniform distribution for those PNe with evident bipolar mor…
Star formation and dust heating in the FIR bright sources of M83
Boquien, M.; Cooray, A.; Lebouteiller, V. +16 more
We investigate star formation and dust heating in the compact far-infrared (FIR) bright sources detected in the Herschel maps of M83. We use the source extraction code GETSOURCES to detect and extract sources in the FIR, as well as their photometry in the mid-infrared and Hα. By performing infrared spectral energy distribution fitting and applying…
Suzaku reveals X-ray continuum piercing the nuclear absorber in Markarian 231
Maiolino, R.; Fiore, F.; Piconcelli, E. +3 more
We report the results from a 2011 Suzaku observation of the nearby low-ionization broad absorption line (BAL) quasar/ULIRG Markarian 231 (Mrk 231). These data reveal that the X-ray spectrum has undergone a large variation from the 2001 XMM-Newton and BeppoSAX observations. We interpret this finding according to a scenario whereby the X-ray continu…
On the nature of the brightest globular cluster in M81
Bressan, A.; Torres-Papaqui, J. P.; Mayya, Y. D. +5 more
We analyse the photometric, chemical, star formation history and structural properties of the brightest globular cluster (GC) in M81, referred to as GC1 in this work, with the intention of establishing its nature and origin. We find that it is a metal-rich ([Fe/H] = -0.60 ± 0.10), alpha-enhanced ([α/Fe] ∼ 0.20 ± 0.05), core-collapsed (core radius …
Three-dimensional Keplerian orbit-superposition models of the nucleus of M31
Magorrian, J.; Brown, C. K.
We present three-dimensional eccentric disc models of the nucleus of M31, modelling the disc as a linear combination of thick rings of massless stars orbiting in the potential of a central black hole. Our models are non-parametric generalizations of the parametric models of Peiris and Tremaine. The models reproduce well the observed Wide Field Pla…
The preferentially magnified active nucleus in IRAS F10214+4724 - II. Spatially resolved cold molecular gas
Heywood, I.; Deane, R. P.; Rawlings, S. +1 more
We present Jansky Very Large Array observations of the cold (CO (1→0)) molecular gas in IRAS F10214+4724, a lensed ultraluminous infraRed galaxy (ULIRG) at z = 2.3 with an obscured active nucleus. The galaxy is spatially and spectrally well resolved in the CO (1→0) emission line. The total intensity and velocity maps reveal a reasonably ordered sy…
X-ray variability and energy spectra from NGC 5408 X-1 with XMM-Newton
Wolter, A.; Belloni, T. M.; Caballero-García, M. D.
The notion of source states characterizing the X-ray emission from black hole binaries has revealed to be a very useful tool to disentangle the complex spectral and aperiodic phenomenology displayed by those classes of accreting objects. We seek to use the same tools for ultraluminous X-ray (ULX) sources. We analysed the data from the longest obse…
The Herschel view of the environment of the radio galaxy 4C+41.17 at z = 3.8
Meisenheimer, K.; Stern, D.; Greve, T. R. +16 more
We present Herschel observations at 70, 160, 250, 350 and 500 µm of the environment of the radio galaxy 4C+41.17 at z = 3.792. About 65 per cent of the extracted sources are securely identified with mid-infrared sources observed with the Spitzer Space Telescope at 3.6, 4.5, 5.8, 8 and 24 µm. We derive simple photometric redshifts, also…