Search Publications
Intrinsic absorbers in BL Lac objects: The XMM-Newton view
Page, M. J.; Branduardi-Raymont, G.; Blustin, A. J.
We present XMM-Newton observations of four BL Lac objects (
The global mass function of M 15
Pulone, L.; De Marchi, G.; Pasquali, A. +1 more
Data obtained with the NICMOS instrument on board the Hubble Space Telescope (HST) have been used to determine the H-band luminosity function (LF) and mass function (MF) of three stellar fields in the globular cluster M 15, located ∼7' from the cluster centre. The data confirm that the cluster MF has a characteristic mass of ∼0.3 M⊙, as…
Observations Indicating That ~1 × 107 K Solar Flare Plasmas May Be Produced in Situ from ~1 × 106 K Coronal Plasma
Landi, E.; Doschek, G. A.; Feldman, U. +1 more
We discuss a set of flare observations obtained at a position of 0.10 Rsolar above the solar northwest limb. The data were acquired by the Solar Ultraviolet Measurement of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SOHO). We derive time-dependent comparisons of physical properties, such as electron…
A Preliminary Observational Search for Circumbinary Disks around Cataclysmic Variables
Howell, Steve B.; Holberg, J. B.; Belle, Kunegunda E. +2 more
Circumbinary (CB) disks have been proposed as a mechanism to extract orbital angular momentum from cataclysmic variables (CVs) during their evolution. As proposed by Taam & Spruit, these disks extend outward to several astronomical units and should be detected observationally via their infrared flux or by absorption lines in the ultraviolet sp…
On the evolution of the solar wind between 1 and 5 AU at the time of the Cassini Jupiter flyby: Multispacecraft observations of interplanetary coronal mass ejections including the formation of a merged interaction region
Dougherty, M. K.; Young, D. T.; Owens, M. J. +5 more
The Cassini flyby of Jupiter occurred at a time near solar maximum. Consequently, the pre-Jupiter data set reveals clear and numerous transient perturbations to the Parker Spiral solar wind structure. Limited plasma data are available at Cassini for this period due to pointing restrictions imposed on the instrument. This renders the identification…
Lower Mass Black Holes in the Great Observatories Origins Deep Survey? Off-nuclear X-Ray Sources
Hornschemeier, A. E.; Chary, R.; Alexander, D. M. +9 more
We have identified a sample of 10 highly reliable off-nuclear (>~2 kpc) X-ray sources at z=0.03-0.25 in late-type host galaxies within the two Great Observatories Origins Deep Survey (GOODS) fields (i.e., the two Chandra Deep Fields). The combination of the superb spatial resolution and great depth of the Hubble Space Telescope Advanced Camera …
On the variability of the iron Kα line in Mrk 841
Nandra, K.; Petrucci, P. O.; Longinotti, A. L. +1 more
Petrucci et al. have recently reported the extraordinary behaviour of the iron Kα line in the Type I active galactic nucleus Mrk 841. At the XMM-Newton/EPIC resolution, a narrow line was observed in a short observation, which then apparently disappeared around 0.5 d later when another observation was performed. The limits are such that the line ca…
Comparison Between Halo cme Expansion Speeds Observed on the Sun, the Related Shock Transit Speeds to Earth and Corresponding Ejecta Speeds at 1 au
Schwenn, R.; Vieira, L. E. A.; Echer, E. +5 more
We have compared characteristics of 38 halo coronal mass ejections observed on the Sun by the Large Angle and Spectrometric Coronagraph onboard SOHO with their corresponding counterparts observed near Earth by the magnetic field and plasma instruments onboard the ACE, WIND and SOHO satellites, in the period from January 1997 to April 2001. We only…
The host galaxy of GRB 990712
Christensen, L.; Vreeswijk, P.; Gorosabel, J. +4 more
We present a comprehensive study of the z=0.43 host galaxy of
Chandra ACIS and XMM-Newton EPIC Observations of the X-Ray-Luminous SN 1978K in NGC 1313
Kaaret, Philip; Schlegel, Eric M.; Kong, Albert +2 more
We describe an observation of the X-ray-luminous SN 1978K in NGC 1313 using the ACIS detector on board Chandra and an archival XMM-Newton EPIC observation. The models that provided good fits to the ASCA SIS and GIS and the ROSAT PSPC spectra no longer do so for the ACIS and EPIC spectra. The best-fit models to the ACIS and EPIC spectra are dual ho…