Search Publications
3D Magnetohydrodynamic Models of Nonthermal Photon Emission in the Binary System γ 2 Velorum
Reimer, A.; Reimer, O.; Kissmann, R. +1 more
Recent reports claiming an association of the massive star binary system {γ }2 Velorum (WR 11) with a high-energy γ-ray source observed by Fermi-LAT contrast the so far exclusive role of η Carinae as the hitherto only detected γ-ray emitter in the source class of particle-accelerating colliding-wind binary (CWB) systems. We offer suppor…
Discovery of a 26.2 day period in the long-term X-ray light curve of SXP 1323: a very short orbital period for a long spin period pulsar
Haberl, F.; Sturm, R.; Carpano, S.
Context. About 120 Be/X-ray binaries (BeXBs) are known in the Small Magellanic Cloud (SMC); about half of them are pulsating with periods from a few to hundreds of seconds. SXP 1323 is one of the longest-period pulsars known in this galaxy.
Aims: SXP 1323 is in the field of view of a large set of calibration observations that we analyse syste…
Constraining the thin disc initial mass function using Galactic classical Cepheids
Lemasle, B.; Figueras, F.; Mor, R. +1 more
Context. The initial mass function (IMF) plays a crucial role in galaxy evolution and its implications on star formation theory make it a milestone for the next decade. It is in the intermediate and high mass ranges where the uncertainties of the IMF are larger. This is a major subject of debate and analysis both for Galactic and extragalactic sci…
Behind the dust curtain: the spectacular case of GRB 160623A
Salvaterra, R.; Tiengo, A.; Mereghetti, S. +6 more
We report on the X-ray dust-scattering features observed around the afterglow of the gamma-ray burst GRB 160623A. With an XMM-Newton observation carried out ∼2 d after the burst, we found evidence of at least six rings, with angular size expanding between ∼2 and 9 arcmin, as expected for X-ray scattering of the prompt gamma-ray burst (GRB) emissio…
EXTraS discovery of two pulsators in the direction of the LMC: a Be/X-ray binary pulsar in the LMC and a candidate double-degenerate polar in the foreground
Salvaterra, R.; Haberl, F.; Tiengo, A. +10 more
Context. The Exploring the X-ray Transient and variable Sky (EXTraS) project searches for coherent signals in the X-ray archival data of XMM-Newton.
Aims: XMM-Newton performed more than 400 pointed observations in the region of the Large Magellanic Cloud (LMC). We inspected the results of the EXTraS period search to systematically look for ne…
Fan Loops Observed by IRIS, EIS, and AIA
Solanki, Sami K.; Polito, Vanessa; Gupta, G. R. +3 more
A comprehensive study of the physical parameters of active region fan loops is presented using the observations recorded with the Interface Region Imaging Spectrometer (IRIS), the EUV Imaging Spectrometer (EIS) on board Hinode, and the Atmospheric Imaging Assembly (AIA) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Obs…
Globular clusters in the far-ultraviolet: evidence for He-enriched second populations in extragalactic globular clusters?
Kundu, Arunav; Zepf, Stephen E.; Peacock, Mark B. +1 more
We investigate the integrated far-ultraviolet (FUV) emission from globular clusters. We present new FUV photometry of M87's clusters based on archival Hubble Space Telescope (HST) Wide Field Planetary Camera 2 F170W observations. We use these data to test the reliability of published photometry based on HST space telescope imaging spectrograph FUV…
OH Survey along Sightlines of Galactic Observations of Terahertz C+
Wang, Shen; Heiles, Carl; Li, Di +9 more
We have obtained OH spectra of four transitions in the {}2{{{\Pi }}}3/2 ground state, at 1612, 1665, 1667, and 1720 MHz, toward 51 sightlines that were observed in the Herschel project Galactic Observations of Terahertz C+. The observations cover the longitude range of (32°, 64°) and (189°, 207°) in the northern Galactic plan…
X-ray-emitting active galactic nuclei from z = 0.6 to 1.3 in the intermediate- and high-density environments of the ORELSE survey
Tomczak, A.; Fassnacht, C. D.; Kocevski, D. D. +8 more
We studied active galactic nucleus (AGN) activity in 12 large-scale structures (LSSs) in the Observations of Redshift Evolution in Large-Scale Environments (ORELSE) survey, at 0.65 < z < 1.28, using a combination of Chandra observations, optical and NIR imaging and spectroscopy. We located a total of 61 AGNs that were successfully matched to…
Results from a triple chord stellar occultation and far-infrared photometry of the trans-Neptunian object (229762) 2007 UK126
Kiss, C.; Ortiz, J. L.; Braga-Ribas, F. +8 more
Context. A stellar occultation by a trans-Neptunian object (TNO) provides an opportunity to probe the size and shape of these distant solar system bodies. In the past seven years, several occultations by TNOs have been observed, but mostly from a single location. Only very few TNOs have been sampled simultaneously from multiple locations. Sufficie…