Search Publications
Multiwavelength search for counterparts of supersoft X-ray sources in M31
Henze, M.; Orio, M.; Chiosi, E. +2 more
We searched for the optical/UV/IR counterparts of seven supersoft X-ray sources (SSSs) in M31 in the Hubble Space Telescope (HST) `Panchromatic Hubble Andromeda Treasury' (PHAT) archival images and photometric catalogue. Three of the SSSs were transient; the other four are persistent sources. The PHAT offers the opportunity to identify SSSs hostin…
A high-resolution image of the inner shell of the P Cygni nebula in the infrared [Fe II] line
Boutsia, K.; Arcidiacono, C.; Ragazzoni, R. +11 more
Using the adaptive optics system of the Large Binocular Telescope, we have obtained near-infrared camera PISCES images of the inner shell of the nebula around the luminous blue variable star P Cygni in the [Fe II] emission line at 1.6435 µm. We have combined the images in order to cover a field of view of about 20 arcsec around P Cygni, thus…
A Herschel PACS survey of brown dwarfs in IC 2391: limits on primordial and debris disc fractions
Riaz, B.; Kennedy, G. M.
We present results from a Herschel Photodetector Array Camera and Spectrometer (PACS) survey of eight brown dwarfs in the IC 2391 cluster. Our aim was to determine the brown dwarf disc fraction at ages of ∼40-50 Myr. None of the eight brown dwarfs observed were detected in the PACS 70 or 160 µm bands. We have determined the detection limits …
XMM-Newton and Canadian Galactic Plane Survey observations of the supernova remnant G107.5-1.5
Jackson, M. S.; Safi-Harb, S.; Kothes, R.
We present an XMM-Newton observation of the highly polarized low-surface-brightness supernova remnant (SNR) G107.5-1.5, discovered with the Canadian Galactic Plane Survey. We do not detect diffuse X-ray emission from the SNR and set an upper limit on the surface brightness of ∼2 × 1030 erg arcmin-2 s-1, at an assum…
Scattering of emission lines in galaxy cluster cores: measuring electron temperature
Sunyaev, R.; Sazonov, S.; Churazov, E. +2 more
The central galaxies of some clusters can be strong emitters in the Lyα and Hα lines. This emission may arise either from the cool/warm gas located in the cool core of the cluster or from the bright AGN within the central galaxy. The luminosities of such lines can be as high as 1042-1044 erg s-1. This emission orig…
A surprising consistency between the far-infrared galaxy luminosity functions of the field and Coma
Ibar, E.; Peletier, R. F.; Dunne, L. +14 more
We present new deep images of the Coma Cluster from the ESA Herschel Space Observatory at wavelengths of 70, 100 and 160 µm, covering an area of 1.75 × 1.0 square degrees encompassing the core and south-west infall region. Our data display an excess of sources at flux densities above 100 mJy compared to blank-field surveys, as expected. We u…
A detailed numerical analysis of asymmetrical density distribution in Saturn's F ring during an encounter with Prometheus
Sutton, Phil J.; Kusmartsev, Feo V.
Saturn's rings, reminiscent of an early Solar system present a unique opportunity to investigate experimentally some mechanisms thought to be responsible for planet and planetesimal formation in protoplanetary discs. Here, we extended the comparison of our numerical models of Prometheus encountering the F ring employing non-interacting and interac…
The CMB derivatives of Planck's beam asymmetry
Rathaus, Ben; Kovetz, Ely D.
We investigate the anisotropy in cosmic microwave background Planck maps due to the coupling between its beam asymmetry and uneven scanning strategy. Introducing a pixel space estimator based on the temperature gradients, we find a highly significant (∼20σ) preference for these to point along ecliptic latitudes. We examine the scale dependence, mo…
A multiwavelength analysis of the clumpy FIR-bright sources in M33
Wilson, C. D.; Foyle, K.; Natale, G. +1 more
We present a multiwavelength study of a sample of far-infrared (FIR) sources detected on the Herschel broad-band maps of the nearby galaxy M33. We perform source photometry on the FIR maps as well as mid-infrared (MIR), Hα, far-ultraviolet and integrated H I and CO line emission maps. By fitting MIR/FIR dust emission spectra, the source dust masse…
Ultraviolet characteristics, outflow properties and variability of active galactic nucleus Markarian 1513
Arav, Nahum; Borguet, Benoit; Edmonds, Doug +4 more
We analysed data from the Cosmic Origins Spectrograph (COS) to characterize the spectral properties and outflows of the active galactic nucleus (AGN), Markarian 1513. Further investigation using previous data collected by the Space Telescope Imaging Spectrograph (STIS), Goddard High Resolution Spectrograph (GHRS), and International Ultraviolet Exp…