Search Publications
The Unification of Powerful Quasars and Radio Galaxies and Their Relation to Other Massive Galaxies
Haas, Martin; Barthel, Peter; Wilkes, Belinda +2 more
The unification model for powerful radio galaxies (RGs) and radio-loud quasars postulates that these objects are intrinsically the same but viewed along different angles. Herschel Space Observatory data permit the assessment of that model in the far-infrared spectral window. We analyze photometry from Spitzer and Herschel for the distant 3CR hosts…
Variable Hard-X-Ray Emission from the Candidate Accreting Black Hole in Dwarf Galaxy Henize 2-10
Greene, Jenny E.; Johnson, Kelsey E.; Goulding, Andy D. +5 more
We present an analysis of the X-ray spectrum and long-term variability of the nearby dwarf starburst galaxy Henize 2-10. Recent observations suggest that this galaxy hosts an actively accreting black hole (BH) with mass ∼106 {{M}⊙ }. The presence of an active galactic nucleus (AGN) in a low-mass starburst galaxy marks a new e…
A Compact High Velocity Cloud near the Magellanic Stream: Metallicity and Small-scale Structure
Kumari, Nimisha; Fox, Andrew J.; Tumlinson, Jason +3 more
The Magellanic Stream (MS) is a well-resolved gaseous tail originating from the Magellanic Clouds. Studies of its physical properties and chemical composition are needed to understand its role in Galactic evolution. We investigate the properties of a compact HVC (CHVC 224.0-83.4-197) lying close on the sky to the MS to determine whether it is phys…
IGR J17463-2854, a possible symbiotic binary system in the galactic center region
Tsygankov, S. S.; Lutovinov, A. A.; Karasev, D. I.
This paper is devoted to determining the nature of the hard X-ray source IGR J17463-2854 located toward the Galactic bulge. Using data from the INTEGRAL and Chandra X-ray observatories, we show that five point X-ray sources with approximately identical fluxes in the 2-10 keV energy band are detected in the error circle of the object under study. I…
An Atlas of Bright Star Spectra in the Near-infrared from Cassini-VIMS
Nicholson, Philip D.; Hedman, Matthew M.; Sloan, G. C. +2 more
We present the Cassini Atlas Of Stellar Spectra (CAOSS), comprised of near-infrared, low-resolution spectra of bright stars recovered from space-based observations by the Cassini spacecraft. The 65 stellar targets in the atlas are predominately M, K, and S giants. However, it also contains spectra of other bright nearby stars including carbon star…
The Araucaria project. Precise physical parameters of the eclipsing binary IO Aquarii
Anderson, R. I.; Maxted, P. F. L.; Pollacco, D. +11 more
Aims: Our aim is to precisely measure the physical parameters of the eclipsing binary IO Aqr and derive a distance to this system by applying a surface brightness - colour relation. Our motivation is to combine these parameters with future precise distance determinations from the Gaia space mission to derive precise surface brightness - colou…
H I study of the environment around ESO 243-49, the host galaxy of an intermediate-mass black hole
Combes, F.; Farrell, S. A.; Servillat, M. +9 more
The lenticular galaxy ESO 243-49 hosts the ultraluminous X-ray source HLX-1, the best candidate intermediate-mass black hole (IMBH) currently known. The environments of IMBHs remain unknown, however, the proposed candidates include the nuclei of dwarf galaxies or globular clusters. Evidence at optical wavelengths points at HLX-1 being the remnant …
The equivalent slab thickness of Mars' ionosphere: Implications for thermospheric temperature
Gurnett, D.; Mouginot, J.; Kofman, W. +4 more
The total electron content (TEC) of a planetary ionosphere is dominated by plasma near and above the height of maximum electron density (Nmax). The ratio TEC/Nmax represents the thickness (τ) of a TEC slab of uniform density (Nmax). For a photochemical ionosphere, τ relates to the scale height (H = kT/mg) of the io…
Investigation of X-class Flare-Associated Coronal Mass Ejections with and without DH Type II Radio Bursts
Shanmugaraju, A.; Vršnak, Bojan; Lawrance, M. Bendict
A statistical analysis of 135 out of 141 X-class flares observed during 1997 - 2012 with and without deca-hectometric (DH) type II radio bursts has been performed. It was found that 79 events (X-class flares and coronal mass ejections - Group I) were associated with DH type II radio bursts and 62 X-class flare events were not. Out of these 62 even…
CoRoT data reduction by example
Weingrill, J.
Data reduction techniques published so far for the CoRoT N2 data product were targeted primarily on the detection of extrasolar planets. Since the whole dataset has been released, specific algorithms are required to process the lightcurves from CoRoT correctly. Though only unflagged datapoints must be chosen for scientific processing, some flags m…