Search Publications
Thomson scattering and collisional ionization in the X-ray grating spectra of the recurrent nova U Scorpii
Nelson, T.; Luna, G. J. M.; Rauch, T. +7 more
We present a Chandra observation of the recurrent nova U Scorpii, done with the High Resolution camera-S (HRC-S) detector and the Low Energy Transmission Grating (LETG) on day 18 after the observed visual maximum of 2010, and compare it with XMM-Newton observations obtained on days 23 and 35 after maximum. The total absorbed flux was in the range …
Far-infrared spectroscopy of a lensed starburst: a blind redshift from {\it herschel}.
Valtchanov, I.; Ivison, R. J.; Clements, D. L. +20 more
We report the redshift of HATLAS J132427.0+284452 (hereafter HATLAS J132427), a gravitationally lensed starburst galaxy, the first determined `blind' by the Herschel Space Observatory. This is achieved via the detection of [C II] consistent with z = 1.68 in a far-infrared spectrum taken with the SPIRE Fourier Transform Spectrometer (FTS). We demon…
Magnetic fields in cometary globules - IV. LBN 437
Lee, Chang Won; Soam, A.; Maheswar, G. +2 more
We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96°, b = -15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one additional cloud, CB 238) using a near-IR photometric method. The foreground contribution to the observed polarization values was …
Short time-scale AGN X-ray variability with EXOSAT: black hole mass and normalized variability amplitude.
McHardy, I. M.
The old EXOSAT medium energy measurements of high-frequency (HF) active galactic nuclei (AGN) power spectral normalization are re-examined in the light of accurate black hole mass determinations which were not available when these data were first published by Green et al. It is found that the normalized variability amplitude (NVA), measured direct…
Kinematics and excitation of the nuclear spiral in the active galaxy Arp 102B
Robinson, Andrew; Axon, David J.; Storchi-Bergmann, Thaisa +3 more
We present a two-dimensional analysis of the gaseous excitation and kinematics of the inner 2.5 × 1.7 kpc2 of the low-ionization nuclear emission-line region (LINER)/Seyfert 1 galaxy Arp 102B, from optical spectra obtained with the Gemini Multi-Object Spectrograph Integral Field Unit on the Gemini North telescope at a spatial resolution…
The origin of blueshifted absorption features in the X-ray spectrum of PG 1211+143: outflow or disc.
Fabian, A. C.; Gallo, L. C.
In some radio-quiet active galactic nuclei (AGN), high-energy absorption features in the X-ray spectra have been interpreted as ultrafast outflows (UFOs) - highly ionized material (e.g. Fe XXV and Fe XXVI) ejected at mildly relativistic velocities. In some cases, these outflows can carry energy in excess of the binding energy of the host galaxy. N…
Dynamical and physical properties of 22 binaries discovered by W. S. Finsen
Docobo, J. A.; Andrade, M.
Using recent speckle measurements performed by different observers, in this paper we present revised orbital elements and dynamical masses for the binaries WDS 02396-1152 (FIN 312), 04515-3454 (FIN 320), 06253+0130 (FIN 343), 07003-2207 (FIN 334 Aa,Ab), 08291-4756 (FIN 315 Aa,Ab), 08345-3236 (FIN 335), 09173-6841 (FIN 363 AB), 09442-2746 (FIN 326)…
The Herschel Fornax Cluster Survey - I. The bright galaxy sample
Ciesla, L.; Bianchi, S.; Fritz, J. +18 more
We present Herschel Space Telescope observations of the nearby Fornax cluster at 100, 160, 250, 350 and 500 µm with a spatial resolution of 7-36 arcsec (10 arcsec ≈ 1 kpc at dFornax = 17.9 Mpc). We define a sample of 11 bright galaxies, selected at 500 µm, that can be directly compared with our past work on the Virgo cluster…
Ultracompact dwarfs around NGC 3258 in the Antlia cluster
Richtler, Tom; Faifer, Favio R.; Smith Castelli, Analía V. +2 more
We present the first compact stellar systems with luminosities in the range of ultracompact dwarfs (UCDs), discovered in the Antlia galaxy cluster (-10.5 < MV < -11.6). The magnitude limit between UCDs and globular clusters (CGs) is discussed. By means of imaging from VLT (FORS1), CTIO (MOSAIC) and the Hubble Space Telescope (ACS)…
A Suzaku X-ray observation of one orbit of the supergiant fast X-ray transient IGR J16479-4514
Tomsick, J. A.; Rodriguez, J.; Sidoli, L. +6 more
We report on a 250 ks long X-ray observation of the supergiant fast X-ray transient IGR J16479-4514 performed with Suzaku in 2012 February. During this observation, about 80 per cent of the short orbital period (Porb ∼ 3.32 d) was covered as continuously as possible for the first time. The source light curve displays variability of more…