Search Publications
Searching for molecular outflows in hyperluminous infrared galaxies
Sturm, E.; Veilleux, S.; Bauer, F. E. +5 more
We present constraints on the molecular outflows in a sample of five hyperluminous infrared galaxies using Herschel observations of the OH doublet at 119 µm. We have detected the OH doublet in three cases: one purely in emission and two purely in absorption. The observed emission profile has a significant blueshifted wing suggesting the poss…
A systematic search for lensed high-redshift galaxies in HST images of MACS clusters
Richard, J.; Ebeling, H.; Repp, A.
We present the results of a 135-arcmin2 search for high-redshift galaxies lensed by 29 clusters from the MAssive Cluster and extended MAssive Cluster Surveys. We use relatively shallow images obtained with the Hubble Space Telescope in four passbands, namely, F606W, F814W, F110W, and F140W. We identify 130 F814W dropouts as candidates f…
NuSTAR and XMM-Newton observations of the ultraluminous X-ray source NGC 5643 X-1
Krivonos, Roman; Sazonov, Sergey
We present a high-quality hard X-ray spectrum of the ultraluminous X-ray source (ULX) NGC 5643 X-1 measured with NuSTAR in 2014 May-June. We have obtained this spectrum by carefully separating the signals from the ULX and from the active nucleus of its host galaxyNGC 5643 located 0.8 arcmin away. Together with long XMM-Newton observations performe…
The soft X-ray spectrum of the high-mass X-ray binary V0332+53 in quiescence
Heinke, Craig O.; Elshamouty, Khaled G.; Chouinard, Rhys
The behaviour of neutron stars in high-mass X-ray binaries (HMXBs) during periods of low mass transfer is of great interest. Indications of spectral softening in systems at low mass-transfer rates suggest that some HMXBs are undergoing fundamental changes in their accretion regime, but the nature of the quiescent X-ray emission is not clear. We pe…
The high-energy gamma-ray detection of G73.9+0.9, a supernova remnant interacting with a molecular cloud
Mikołajewska, Joanna; Chernyakova, Maria; Zdziarski, Andrzej A. +6 more
We have analysed the Fermi Large Area Telescope (LAT) data on the SNR G73.9+0.9. We have confirmed a previous detection of high-energy γ-rays from this source at a high significance of ≃12σ. The observed spectrum shows a significant curvature, peaking in EFE at ∼1 GeV. We have also calculated the flux upper limits in the mm-wavelength a…
Atomic data and density diagnostics for S IV
Del Zanna, G.; Badnell, N. R.
We present a new large-scale R-matrix scattering calculation for S IV. We used the intermediate-coupling frame transformation method and applied term energy corrections. Our calculation has a much larger configuration-interaction and close-coupling expansion than previous calculations. Despite that, we find good agreement in the predicted intensit…
Clues to cometary circular polarization from studying the magnetic field in the vicinity of the nucleus of comet 67P/Churyumov-Gerasimenko
Kolokolova, Ludmilla; Hoang, Thiem; Goetz, Charlotte +4 more
Circular polarization in cometary continuum bands has been observed for more than 30 years. Recently, imaging data on circular polarization have been obtained for more than 10 comets using the 6-m Big Telescope Alt-azimuthal (BTA) telescope (Russia). However, despite the accumulation of significant amounts of data, the mechanisms that form circula…
Spectral variation in the supergiant fast X-ray transient SAX J1818.6-1703 observed by XMM-Newton and INTEGRAL
Hill, A. B.; Sidoli, L.; Bird, A. J. +6 more
We present the results of a 30 ks XMM-Newton observation of the supergiant fast X-ray transient (SFXT) SAX J1818.6-1703 - the first in-depth soft X-ray study of this source around periastron. INTEGRAL observations shortly before and after the XMM-Newton observation show the source to be in an atypically active state. Over the course of the XMM-New…
Constraining SN feedback: a tug of war between reionization and the Milky Way satellites
Lacey, Cedric G.; Hou, Jun; Frenk, Carlos. S. +1 more
Theoretical models of galaxy formation based on the cold dark matter cosmogony typically require strong feedback from supernova (SN) explosions in order to reproduce the Milky Way satellite galaxy luminosity function and the faint end of the field galaxy luminosity function. However, too strong a SN feedback also leads to the universe reionizing t…
High-angular-resolution stellar imaging with occultations from the Cassini spacecraft - III. Mira
Nicholson, Philip D.; Hedman, Matthew M.; Stewart, Paul N. +1 more
We present an analysis of spectral and spatial data of Mira obtained by the Cassini spacecraft, which not only observed the star's spectra over a broad range of near-infrared wavelengths, but was also able to obtain high-resolution spatial information by watching the star pass behind Saturn's rings. The observed spectral range of 1-5 microns revea…