Search Publications
Discovery of a transient ultraluminous X-ray source in the elliptical galaxy M86
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +2 more
We report the discovery of the transient ultraluminous X-ray source (ULX) CXOU J122602.3+125951 (hereafter M86 tULX-1), located 3'52″ (19 kpc) north-west of the centre of the giant elliptical galaxy M86 (NGC 4406) in the Virgo Cluster. The spectrum of M86 tULX-1 can be fit by a power law plus multicolour disc model with a 1.0^{+0.8}_{-2.6} index a…
Kinematics of Open Star Clusters Based on the Data of the New Version of the "Homogeneous Catalog of Open Cluster Parameters"
Loktin, A. V.; Popova, M. E.
We investigate some aspects of Galactic disc kinematics based on the data on open clusters from the current version of "The Homogeneous Catalog of the Main Parameters of Open Star Clusters" and from Gaia DR2. Based on the radial velocity and proper motion data for the clusters we determine the angular velocity of the Sun in the Galaxy as Ω0
The Trans-Neptunian Object (84922) 2003 VS2 through Stellar Occultations
Bérard, D.; Brosch, N.; Maury, A. +50 more
We present results from three world-wide campaigns that resulted in the detections of two single-chord and one multi-chord stellar occultations by the plutino object (84922) 2003 VS2. From the single-chord occultations in 2013 and 2014 we obtained accurate astrometric positions for the object, while from the multi-chord occultation on 2…
A Catalog of Galaxies in the Direction of the Perseus Cluster
Wittmann, Carolin; Kotulla, Ralf; Lisker, Thorsten +4 more
We present a catalog of 5437 morphologically classified sources in the direction of the Perseus galaxy cluster core, among them 496 early-type low-mass galaxy candidates. The catalog is primarily based on V-band imaging data acquired with the William Herschel Telescope, which we used to conduct automated source detection and derive photometry. We …
A Near-infrared View of Nearby Galaxies: The Case of NGC 6300
Díaz, R. J.; Agüero, M. P.; Gaspar, G. +3 more
We present a near-infrared study of the Seyfert 2 galaxy NGC 6300, based on subarcsecond images and long slit spectroscopy obtained with Flamingos-2 at Gemini South. We have found that the peak of the nuclear continuum emission in the K s band and the surrounding nuclear disk are 25 pc off-center with respect to the center of symmetry…
A GMRT 150 MHz search for variables and transients in Stripe 82
Frail, D. A.; Mooley, K. P.; Intema, H. T. +1 more
We have carried out a dedicated transient survey of 300 deg2 of the SDSS Stripe 82 region using the Giant Metrewave Radio Telescope (GMRT) at 150 MHz. Our multi-epoch observations, together with the TGSS survey, allow us to probe variability and transient activity on four different time-scales, beginning with 4 h and up to 4 yr. Data ca…
On the Fast Solar Wind Heating and Acceleration Processes: A Statistical Study Based on the UVCS Survey Data
Telloni, Daniele; Antonucci, Ester; Giordano, Silvio
The UltraViolet Coronagraph Spectrometer (UVCS) on board the SOlar and Heliospheric Observatory has almost continuously observed, throughout the whole solar cycle 23, the UV solar corona. This work addresses the first-ever statistical analysis of the daily UVCS observations, performed in the O VI channel, of the northern polar coronal hole, betwee…
Photometry of K2 Campaign 9 bulge data
Udalski, A.; Poleski, R.; Gould, A. +4 more
In its Campaign 9, K2 observed dense regions toward the Galactic bulge in order to constrain the microlensing parallaxes and probe for free-floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to a combination of the very high stellar density, large pixels of the Kepler camera, and the pointing drift of th…
2PBC J0658.0-1746: a hard X-ray eclipsing polar in the orbital period gap
Mukai, K.; de Martino, D.; Masetti, N. +2 more
The hard X-ray source 2PBC J0658.0-1746 was proposed as an eclipsing magnetic cataclysmic variable of the polar type, based on optical follow-ups. We present the first spectral and timing analysis at X-ray energies with XMM-Newton, complemented with archival X-ray, optical, infrared (IR) photometry, and spectroscopy. The X-ray emission shows brigh…
A VLT/FLAMES survey for massive binaries in Westerlund 1. V. The X-ray selected blue stragglers Wd1-27 and -30a
Negueruela, I.; Najarro, F.; Clark, J. S. +3 more
Context. Recent observational studies indicate that a large number of OB stars are found within binary systems which may be expected to interact during their lifetimes. Significant mass transfer or indeed merger of both components is expected to modify evolutionary pathways, facilitating the production of exceptionally massive stars which will pre…