Search Publications
SDSS J094533.99+100950.1 - the remarkable weak emission line quasar
Hryniewicz, K.; Czerny, B.; Nikołajuk, M. +1 more
Weak emission line quasars are a rare and puzzling group of objects. In this paper, we present one more object of this class found in the Sloan Digital Sky Survey (SDSS). The quasar SDSS J094533.99+100950.1, lying at z = 1.66, has practically no CIV emission line, a red continuum very similar to the second steepest of the quasar composite spectra …
Bursting SN 1996cr's bubble: hydrodynamic and X-ray modelling of its circumstellar medium
Dwarkadas, V. V.; Dewey, D.; Bauer, F.
SN1996cr is one of the five closest supernovae (SNe) to explode in the past 30 yr. Due to its fortuitous location in the Circinus galaxy at ~3.7 Mpc, there is a wealth of recently acquired and serendipitous archival data available to piece together its evolution over the past decade, including a recent 485-ks Chandra high-energy transmission grati…
Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars
Houdebine, E. R.
We have measured v sin i for a selected sample of dM1-type stars. We give 114 measurements of v sin i for 88 different stars, and six upper detection limits. These are the first measurements of v sin i for most of the stars studied here. This represents the largest sample of v sin i measurements for M dwarfs at a given spectral type. For these mea…
The 2008 October Swift detection of X-ray bursts/outburst from the transient SGR-like AXP 1E1547.0-5408
Campana, S.; Tiengo, A.; de Luca, A. +17 more
We report on the detailed study of the 2008 October outburst from the anomalous X-ray pulsar 1E1547.0-5408 discovered through the Swift/Burst Alert Telescope (BAT) detection of soft gamma-ray repeater like short X-ray bursts on 2008 October 3. The Swift/X-ray Telescope (XRT) started observing the source after less than 100s since the BAT trigger, …
Cold dust and young starbursts: spectral energy distributions of Herschel SPIRE sources from the HerMES survey
Aussel, H.; Elbaz, D.; Valtchanov, I. +75 more
We present spectral energy distributions (SEDs) for 68 Herschel sources detected at 5σ at 250, 350 and 500 µm in the HerMES SWIRE-Lockman field. We explore whether existing models for starbursts, quiescent star-forming galaxies and active galactic nucleus dust tori are able to model the full range of SEDs measured with Herschel. We find that…
Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood
Lambert, David L.; Lyubimkov, Leonid S.; Rostopchin, Sergey I. +2 more
The following parameters are determined for 63 Galactic supergiants in the solar neighbourhood: effective temperature Teff; surface gravity logg iron abundance logɛ(Fe) microturbulent parameter Vt; mass M/Msolar age t and distance d. A significant improvement in the accuracy of the determination of logg, and all pa…
Period-luminosity relations of pulsating M giants in the solar neighbourhood and the Magellanic Clouds
Derekas, A.; Kiss, L. L.; Bedding, T. R. +3 more
We analyse the results of a 5.5-yr photometric campaign that monitored 247 southern, semiregular variables with relatively precise Hipparcos parallaxes to demonstrate an unambiguous detection of red giant branch (RGB) pulsations in the solar neighbourhood. We show that Sequence A' contains a mixture of asymptotic giant branch and RGB stars, as ind…
Demystifying the coronal-line region of active galactic nuclei: spatially resolved spectroscopy with the Hubble Space Telescope
Komossa, S.; Mazzalay, Ximena; Rodríguez-Ardila, Alberto
We present an analysis of Space Telescope Imaging Spectrograph (STIS)/Hubble Space Telescope optical spectra of a sample of 10 Seyfert galaxies aimed at studying the structure and physical properties of the coronal-line region (CLR). The high spatial resolution provided by STIS allowed us to resolve the CLR and obtain key information about the kin…
Polarized QPOs from the INTEGRAL polar IGRJ14536-5522 (=Swift J1453.4-5524)
O'Donoghue, Darragh; Buckley, David A. H.; Potter, Stephen B. +10 more
We report optical spectroscopy and high-speed photometry and polarimetry of the INTEGRAL source IGRJ14536-5522 (=Swift J1453.4-5524). The photometry, polarimetry and spectroscopy are modulated on an orbital period of 3.1564(1) h. Orbital circularly polarized modulations are seen from ~0 to ~ -18 per cent, unambiguously identifying IGRJ14536-5522 a…
Multiwavelength observations of 1RXH J173523.7-354013: revealing an unusual bursting neutron star
D'Avanzo, P.; de Luca, A.; Degenaar, N. +14 more
On 2008 May 14, the Burst Alert Telescope onboard the Swift mission triggered on a type-I X-ray burst from the previously unclassified ROSAT object 1RXH J173523.7-354013, establishing the source as a neutron star X-ray binary. We report on X-ray, optical and near-infrared observations of this system. The X-ray burst had a duration of ~2 h and belo…