Search Publications
The Nature of the Hyper-Runaway Candidate Hip 60350
Przybilla, Norbert; Irrgang, Andreas; Heber, Ulrich +2 more
Young, massive stars in the Galactic halo are widely supposed to be the result of an ejection event from the Galactic disk forcing some stars to leave their place of birth as so-called runaway stars. Here, we present a detailed spectroscopic and kinematic analysis of the runaway B star HIP 60350 to determine which runaway scenario—a supernova expl…
Astrometry of the Plates of the DWA Digitized with the MICROTEK SCANMAKER 9800XL TMA Scanner
Andruk, V.; Golovnya, V.; Yatsenko, A.
A detailed testing of the Microtek ScanMaker 9800XL TMA scanner aimed at large-scale plates (300 × 300 mm and larger) digitization has been undertaken. The evaluation of the accuracy of star image centering and darkening determined from the newly developed method in MIDAS/ROMAFOT environment has been carried out from the comparison of digitized im…
The Optical Companion to the Binary Millisecond Pulsar J1824-2452H in the Globular Cluster M28
Dalessandro, E.; Ransom, S. M.; Possenti, A. +8 more
We report on the optical identification of the companion star to the eclipsing millisecond pulsar (MSP) PSR J1824-2452H in the galactic globular cluster M28 (NGC 6626). This star is at only 0farcs2 from the nominal position of the pulsar and it shows optical variability (~0.25 mag) that nicely correlates with the pulsar orbital period. It is locat…
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…
A Comparison of Hard X-ray Photon Indices and Iron Kα Emission Lines in X-ray Luminous Narrow- and Broad-line Seyfert 1 Galaxies
Zhang, Shuang-Nan; Zhou, Xin-Lin
We use publicly available XMM-Newton data to systematically compare the hard X-ray photon indices, Γ2-10 keV , and the iron Kα emission lines of narrow- and broad-line Seyfert 1 (NLS1 and BLS1) galaxies. We compile a flux-limited (f 2-10 keV >= 1 × 10-12 erg s-1 cm-2) sample including 114 …
Methanol maps of low-mass protostellar systems. I. The Serpens molecular core
van Dishoeck, E. F.; Kristensen, L. E.; Hogerheijde, M. R. +4 more
Context. Methanol has a rich rotational spectrum providing a large number of transitions at sub-millimetre wavelengths from a range of energy levels in one single telescope setting, thus making it a good tracer of physical conditions in star-forming regions. Furthermore, it is formed exclusively on grain surfaces and is therefore a clean tracer of…
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…
The Buried Starburst in the Interacting Galaxy II Zw 096 as Revealed by the Spitzer Space Telescope
Sturm, E.; Veilleux, S.; Sanders, D. B. +31 more
An analysis of data from the Spitzer Space Telescope, Hubble Space Telescope, Chandra X-ray Observatory, and AKARI Infrared Astronomy Satellite is presented for the z = 0.036 merging galaxy system II Zw 096 (CGCG 448-020). Because II Zw 096 has an infrared luminosity of log(L IR/L sun) = 11.94, it is classified as a Luminous …
A Unified Timing and Spectral Model for the Anomalous X-ray Pulsars XTE J1810-197 and CXOU J164710.2-455216
Stella, L.; Israel, G. L.; Zane, S. +3 more
Anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs) are two small classes of X-ray sources strongly suspected to host a magnetar, i.e., an ultra-magnetized neutron star with B ≈ 1014-1015 G. Many SGRs/AXPs are known to be variable, and recently the existence of genuinely "transient" magnetars was discovered. Here, …
Gas in the protoplanetary disc of HD 169142: Herschel's view
Pinte, C.; Ménard, F.; Duchêne, G. +49 more
In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD 169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs.…