Search Publications
A new population of planetary nebulae discovered in the Large Magellanic Cloud - I. Preliminary sample
Parker, Quentin A.; Reid, Warren. A.
We report our initial discovery of 73 new planetary nebulae (PNe) in the Large Magellanic Cloud (LMC) following confirmatory 2dF spectroscopy on the Anglo-Australian Telescope. Preliminary candidate sources come from a 10 per cent sub-area of our new deep, high-resolution Hα map of the central 25deg2 of the LMC obtained with the UK Schm…
An XMM-Newton observation of the young open cluster NGC 2547: coronal activity at 30 Myr
Briggs, K. R.; Jeffries, R. D.; Evans, P. A. +1 more
We report on XMM-Newton observations of the young open cluster NGC 2547 which allow us to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission is seen from stars at all spectral types, peaking among G stars at luminosities (0.3-3 keV) of Lx≃ 1030.5 erg s-1 …
The infrared Hourglass cluster in M8*†
Maíz Apellániz, J.; Barbá, R. H.; Rubio, M. +2 more
A detailed study of the Hourglass nebula in the M8 star-forming region is presented. The study is mainly based on recent subarcsec-resolution JHKs images taken at Las Campanas Observatory and complemented with archival Hubble Space Telescope (HST) images and long-slit spectroscopy retrieved from the European Southern Observatory Archive…
How extreme are the Wolf-Rayet clusters in NGC3125?*
Crowther, P. A.; Hadfield, L. J.
We reinvestigate the massive stellar content of the irregular dwarf galaxy NGC3125 (Tol 3) using Very Large Telescope (VLT)/FORS1 imaging and spectroscopy, plus archival VLT/ISAAC, Hubble Space Telescope (HST)/FOC and HST/STIS data sets. FORS1 narrow-band imaging confirms that the NGC3125-A and -B knots represent the primary sites of Wolf-Rayet (W…
XMM-Newton observations of the black hole X-ray transient XTE J1650-500 in quiescence
Homan, Jeroen; Miller, Jon M.; Belloni, Tomaso +4 more
We report the result of an XMM-Newton observation of the black hole X-ray transient XTE J1650-500 in quiescence. The source was not detected, and we set upper limits on the 0.5-10 keV luminosity of 0.9-1.0 × 1031 ergs-1 (for a newly derived distance of 2.6 kpc). These limits are in line with the quiescent luminosities of blac…
Integral field spectroscopy of Hα emission in cooling flow cluster cores: disturbing the molecular gas reservoir
Swinbank, A. M.; Edge, A. C.; Wilman, R. J.
We present optical integral field spectroscopy of the Hα-luminous (>1042ergs-1) central cluster galaxies in the cores of the cooling flow clusters A1664, A1835, A2204 and Zw8193. From the [NII]+Hα complex in these moderate resolution (70-150kms-1) spectra we derive 2D views of the distribution and kinematics of …
New members in the Upper Scorpius association from the UKIRT Infrared Deep Sky Survey Early Data Release†
Hambly, N. C.; Jameson, R. F.; Lodieu, N.
We present the results of a 9.3-deg2 infrared (ZYJHK) survey in the Upper Scorpius association extracted from the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Cluster Survey Early Data Release. We have selected a total of 112 candidates from the (Z-J, Z) colour-magnitude diagram over the Z= 12.5-20.5 magnitude range, corresponding t…
The globular cluster kinematics and galaxy dark matter content of NGC 4649 (M60)
Forbes, Duncan A.; Beasley, Michael A.; Zepf, Stephen E. +7 more
From observations with the GMOS multislit spectrograph on the Gemini North telescope, we have obtained spectra for 39 globular cluster (GC) candidates in the Virgo giant elliptical galaxy NGC 4649 (M60), of which 38 are confirmed GCs. The clusters extend out to a radius of 260 arcsec (3.5 effective radii). We find no rotation of the GC system, wit…
The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
Falomo, R.; Uslenghi, M.; Treves, A. +1 more
We report on the analysis of the photometric and spectroscopic properties of a sample of 29 low-redshift (z < 0.6) QSOs for which both Hubble Space Telescope (HST) WFPC2 images and ultraviolet HST FOS spectra are available. For each object we measure the R-band absolute magnitude of the host galaxy, the CIV(1550Å) linewidth and the 1350Å contin…
XMM-Newton observations of bright ROSAT selected active galactic nuclei with low intrinsic absorption
Pietsch, W.; Boller, Th.; Brinkmann, W. +4 more
We present a sample of 21 ROSAT bright active galactic nuclei (AGNs), representing a range of spectral classes, and selected for follow-up snapshot observations with XMM-Newton. The typical exposure was between 5 and 10ks. The objects were primarily selected on the bases of X-ray brightness and not on hardness ratio; thus the sample cannot be stri…