Search Publications
CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Monocerotis
Amado, P. J.; Baudin, F.; Poretti, E. +15 more
Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution echelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Monocerotis. We derived new, accurate ephemerides for both the orbital motion (with a period of ) and the long-term…
On the chains of star complexes and superclouds in spiral arms
Efremov, Yu. N.
We study the relation between the occurrence of a regular chain of star complexes and superclouds in a spiral arm, and other properties of the spiral arm. A regular string of star complexes is located in the north-western arm of M31; these have about the same size, 0.6 kpc with spacing of 1.1 kpc. Within the same arm segment, a regular magnetic fi…
Multiwavelength properties of a new Geminga-like pulsar: PSRJ2021+4026
Cheng, K. S.; Takata, J.; Wang, Y. +4 more
In this paper, we report on a detailed investigation of the multiwavelength properties of a newly detected γ-ray pulsar, PSRJ2021+4026, in both observational and theoretical aspects. We first identify an X-ray source in the XMM-Newton serendipitous source catalogue, 2XMMJ202131.0+402645, located within the 95 per cent confidence circle of PSRJ2021…
Constraints on star-forming galaxies at z >= 6.5 from HAWK-I Y-band imaging of GOODS-South
Bunker, Andrew; Jarvis, Matt J.; Hickey, Samantha +2 more
We present the results of our search for high-redshift Lyman-break galaxies over the GOODS-South field. We use Hubble Space Telescope (HST)-ACS data in B, V, i' & z', Very Large Telescope (VLT)-ISAAC J and Ks, Spitzer-Infrared Array Camera (IRAC) 3.6, 4.5, 5.8 and 8.0 µm data in conjunction with the new HAWK-I Y-band science verification…
Final verdict from XMM-Newton: the X-ray obscured Seyfert galaxy NGC 5506 has a broad Fe Kα line
Bianchi, S.; Guainazzi, M.; Dadina, M. +4 more
We present the first unambiguous evidence of a broad (Gaussian width ~330 eV) component of the iron Kα fluorescent emission line in the X-ray obscured narrow-line Seyfert 1 galaxy, NGC 5506. This is the main result of a spectroscopic monitoring campaign on this source, performed with the XMM-Newton observatory between 2001 February and …
The lensing efficiencies of MACS X-ray-selected versus RCS optically selected galaxy clusters
Maoz, Dan; Bartelmann, Matthias; Ebeling, Harald +2 more
The statistics of strongly lensed arcs in samples of galaxy clusters provide information on cluster structure that is complementary to that from individual clusters. However, samples of clusters that have been analysed to date have been either small, heterogeneous or observed with limited angular resolution. We measure the lensed-arc statistics of…
The orbital period in the supergiant fast X-ray transient IGR J16465-4507
Hill, A. B.; Bird, A. J.; Scaringi, S. +6 more
Timing analysis of the INTEGRAL-IBIS and Swift-BAT light curves of the supergiant fast X-ray transient (SFXT) IGR J16465-4507 has identified a period of 30.32 +/- 0.02 d which we interpret as the orbital period of the binary system. In addition 11 outbursts (nine of which are previously unpublished) have been found between MJD 52652 and 54764, all…
SDSS J150634.27+013331.6: the second compact elliptical galaxy in the NGC 5846 group
Chilingarian, Igor V.; Bergond, Gilles
We report the discovery of the second compact elliptical (cE) galaxy SDSS J150634.27+013331.6 in the nearby NGC 5846 group by the Virtual Observatory (VO) workflow. This object (MB = -15.98 mag, Re = 0.24 kpc) becomes the fifth cE where the spatially resolved kinematics and stellar populations can be obtained. We used archiva…
The effects of an active galactic nucleus on host galaxy colour and morphology measurements
Ivison, R. J.; Koekemoer, A. M.; Faber, S. M. +11 more
We assess the effects of simulated active galactic nuclei (AGN) on the colour and morphology measurements of their host galaxies. To test the morphology measurements, we select a sample of galaxies not known to host AGN and add a series of point sources scaled to represent specified fractions of the observed V-band light detected from the resultin…
Dissecting the Lyman α emission halo of LAB1
Morris, Simon L.; de Zeeuw, P. T.; Geach, James E. +4 more
We report observations of Lyman alpha blob 1 (LAB1) in the SSA 22 protocluster region (z = 3.09) with the integral-field spectrograph SAURON. We increased the signal-to-noise ratio in the spectra by more than a factor of 3 compared to our previous observations. This allows us to probe the structure of the LAB system in detail, examining its struct…