Search Publications
γ-rays from anisotropic inverse Compton e± pair cascades in microquasars: application to Cyg X-3
Bednarek, W.; Sitarek, J.
Microquasars are expected to emit high-energy γ-rays owing to their general similarities to γ-ray-emitting blazars (evidence of relativistic jets, non-thermal radio to X-ray emission). In fact, the first source of this type, Cyg X-3, has recently been unambiguously discovered by satellite telescopes. We study the features of the γ-ray radiation pr…
Identifying a new intermediate polar using XMM-Newton and INTEGRAL
Ramsay, Gavin; Wheatley, Peter J.; Middleton, Matthew J. +3 more
The bright X-ray source 2XMMi J180438.7-145647 is fortunate to have long baseline observations in INTEGRAL that complement observations taken by other missions. Optical spectroscopy of this object has suggested a distance of ∼7 kpc and an identification with a low-mass X-ray binary. We instead use the X-ray data from 0.3 to 40 keV to identify the …
Extended X-ray emission from non-thermal sources in the COSMOS field: a detailed study of a large radio galaxy at z= 1.168
Schinnerer, Eva; Koekemoer, Anton; Finoguenov, Alexis +5 more
X-ray selected galaxy group samples are usually generated by searching for extended X-ray sources that reflect the thermal radiation of the intragroup medium. On the other hand, large radio galaxies that regularly occupy galaxy groups also emit in the X-ray window, and their contribution to X-ray selected group samples is still not well understood…
XMM-Newton EPIC and OM observation of Nova Centauri 1986 (V842 Cen)
Luna, G. J. M.; Brickhouse, N. S.; Diaz, M. P. +1 more
We report the results from the temporal and spectral analysis of an XMM-Newton observation of Nova Centauri 1986 (V842 Cen). We detect a period at 3.51 ± 0.4 h in the EPIC data and at 4.0 ± 0.8 h in the Optical Monitor (OM) data. The X-ray spectrum is consistent with the emission from an absorbed thin thermal plasma with a temperature distribution…
Observation and modelling of main-sequence star chromospheres - XIX. FIES and FEROS observations of dM1 stars
Houdebine, E. R.; Butler, C. J.; Telting, J. +1 more
We present 187 high-resolution spectra for 62 different M1 dwarfs from observations obtained with the FIbre-fed Echelle Spectrograph (FIES) on the Nordic Optical Telescope (NOT) and from observations with the Fibre-fed Extended Range Echelle Spectrograph (FEROS) from the European Southern Observatory (ESO) data base. We also compiled other measure…
The massive stellar population in the young association LH 95 in the Large Magellanic Cloud
Da Rio, N.; Gouliermis, D. A.; De Marchi, G. +3 more
We present a spectroscopic study of the most massive stars in the young (4 Myr old) stellar cluster LH 95 in the Large Magellanic Cloud. This analysis allows us to complete the census of the stellar population of the system, previously investigated by us down to 0.4 M⊙ with deep Hubble Space Telescope Advanced Camera for Surveys photome…
Antlia Dwarf Galaxy: distance, quantitative morphology and recent formation history via statistical field correction
Pimbblet, Kevin A.; Couch, Warrick J.
We apply a statistical field correction technique originally designed to determine membership of high redshift galaxy clusters to Hubble Space Telescope (HST) imaging of the Antlia Dwarf Galaxy; a galaxy at the very edge of the Local Group. Using the tip of the red giant branch standard candle method coupled with a simple Sobel edge detection filt…
Investigation of CTA 1 using a Suzaku observation
Enoto, Teruaki; Kong, Albert K. H.; Hui, C. Y. +7 more
We report on a 105-ks Suzaku observation (obsid 404011010 with J. Takata as PI) of the supernova remnant CTA 1 (G119.5+10.2). The Suzaku soft X-ray observation was carried out using both the timing and imaging modes. A ∼10-arcmin extended feature, which is interpreted as a bow-shock component of the pulsar wind nebula, is revealed in this deep obs…
Very fast photometric and X-ray observations of the intermediate polar V2069 Cygni (RX J2123.7+4217)
Haberl, F.; Kanbach, G.; Słowikowska, A. +1 more
We present fast timing photometric observations of the intermediate polar V2069 Cygni (RX J2123.7+4217) using the Optical Timing Analyzer (OPTIMA) at the 1.3-m telescope of Skinakas Observatory. The optical (450-950 nm) light curve of V2069 Cygni was measured with sub-second resolution for the first time during 2009 July and revealed a double-peak…
The shallow-decay phase in both the optical and X-ray afterglows of Swift GRB 090529A: energy injection into a wind-type medium?
Fynbo, J. P. U.; Kann, D. A.; Leloudas, G. +22 more
The energy injection model is the usual choice for interpreting the shallow-decay phase in Swift gamma-ray burst (GRB) X-ray afterglows. However, very few GRBs have simultaneous signatures of energy injection in their optical and X-ray afterglows. Here, we report on the optical observations of GRB 090529A from 2000 s to ∼106 s after the…