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XMM-Newton observations of the Galactic Centre Region - II. The soft-thermal emission
Warwick, R. S.; Heard, V.
We have extended our earlier study of the X-ray emission emanating from the central 100 pc × 100 pc region of our Galaxy to an investigation of several features prominent in the soft X-ray (2-4.5 keV) band. We focus on three specific structures: a putative bipolar outflow from the vicinity of Sgr A*; a high surface brightness region located roughl…
Lyman Break and ultraviolet-selected galaxies at z ∼ 1 - II. PACS 100 µm/160 µm FIR detections
Berta, S.; Magnelli, B.; Lutz, D. +53 more
In this work, we report the Photodetector Array Camera and Spectrometer (PACS) 100 µm/160 µm detections of a sample of 42 GALEX-selected and far-infrared (FIR)-detected Lyman break galaxies (LBGs) at z ∼ 1 located in the Cosmic Evolution Survey (COSMOS) field and analyse their ultraviolet (UV) to FIR properties. The detection of these …
VLT/VIMOS observations of an occulting galaxy pair: redshifts and effective extinction curve
Dalcanton, J. J.; Böker, T.; Holwerda, B. W. +2 more
We present Very Large Telescope/Visible Multiobject Spectrograph Integral Field Unit observations of an occulting galaxy pair previously discovered in Hubble Space Telescope (HST) observations. The foreground galaxy is a low-inclination spiral disc, which causes clear attenuation features seen against the bright bulge and disc of the background ga…
Optical IFU observations of gas pillars surrounding the super star cluster NGC 3603
Smith, L. J.; Westmoquette, M. S.; Ercolano, B. +1 more
We present optical integral field unit observations of two gas pillars surrounding the Galactic young massive star cluster NGC 3603. The high S/N and spectral resolution of these data have allowed us to accurately quantify the Hα, [N II] and [S II] emission line shapes, and we find a mixture of broad (FWHM ∼ 70-100 km s-1) and narrow (&…
Extragalactic number counts at 100 µm, free from cosmic variance
Ivison, R. J.; Roseboom, I. G.; van der Werf, P. P. +4 more
We use data from the Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre (DEBRIS) survey, taken at 100 µm with the Photoconductor Array Camera and Spectrometer instrument on board the Herschel Space Observatory, to make a cosmic variance independent measurement of the extragalactic number counts. These data consist of …
Optical and X-ray properties of CAL 83 - I. Quasi-periodic optical and supersoft variability
Udalski, A.; Charles, P. A.; Meintjes, P. J. +2 more
We have studied the long-term (∼ years) temporal variability of the prototype supersoft X-ray source (SSS) CAL 83 in the Large Magellanic Cloud, using data from the massive compact halo object (MACHO) and Optical Gravitational Lensing Experiment (OGLE) projects. The CAL 83 light curve exhibits dramatic brightness changes of ∼1 mag on time-scales o…
The orientation dependence of quasar spectral energy distributions
Brotherton, M. S.; Runnoe, Jessie C.; Shang, Z.
We investigate the orientation dependence of the spectral energy distributions in a sample of radio-loud quasars. Selected specifically to study orientation issues, the sample contains 52 sources with redshifts in the range 0.16 < z < 1.4 and measurements of radio core dominance, a radio orientation indicator. Measured properties include mon…
Mining unusual and rare stellar spectra from large spectroscopic survey data sets using the outlier-detection method
Liu, Jie; Kong, Xiao; Li, Yinbi +9 more
The large number of spectra obtained from sky surveys such as the Sloan Digital Sky Survey (SDSS) and the survey executed by the Large sky Area Multi-Object fibre Spectroscopic Telescope (LAMOST, also called GuoShouJing Telescope) provide us with opportunities to search for peculiar or even unknown types of spectra. In response to the limitations …
Evidence of rocky planetesimals orbiting two Hyades stars
Gänsicke, B. T.; Koester, D.; Farihi, J.
The Hyades is the nearest open cluster, relatively young and containing numerous A-type stars; its known age, distance, and metallicity make it an ideal site to study planetary systems around 2-3 M⊙ stars at an epoch similar to the late heavy bombardment. Hubble Space Telescope far-ultraviolet spectroscopy strongly suggests ongoing, ext…
A Herschel-ATLAS study of dusty spheroids: probing the minor-merger process in the local Universe
Clements, D. L.; Smith, M.; Cooray, A. +25 more
We use multiwavelength (0.12-500 µm) photometry from Herschel-ATLAS, WISE, UKIDSS, SDSS and GALEX to study 23 nearby spheroidal galaxies with prominent dust lanes (DLSGs). DLSGs are considered to be remnants of recent minor mergers, making them ideal laboratories for studying both the interstellar medium (ISM) of spheroids and minor-merger-d…