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Three-micron extinction of the Titan haze in the 250-700 km altitude range: Possible evidence of a particle-aging process
Bar-Nun, Akiva; Kim, Sang Joon; Courtin, Régis
Context. The chemical nature of the Titan haze is poorly understood. The investigation carried out by the Cassini-Huygens suite of instruments is bringing new insights into this question.
Aims: This work aims at deriving the vertical variation of the spectral structure of the 3.3-3.4 µm absorption feature of the Titan haze from Cassini …
Multiwavelength Observations of a Slow-rise, Multistep X1.6 Flare and the Associated Eruption
Cho, K. -S.; Yurchyshyn, V.; Abramenko, V. I. +2 more
Using multiwavelength observations, we studied a slow-rise, multistep X1.6 flare that began on 2014 November 7 as a localized eruption of core fields inside a δ-sunspot and later engulfed the entire active region (AR). This flare event was associated with formation of two systems of post-eruption arcades (PEAs) and several J-shaped flare ribbons s…
The Temperature Distribution of Horizontal Branch Stars: Methods and First Results
Dalessandro, E.; Salaris, M.; Lagioia, E. P. +4 more
As part of a large project aimed at characterizing the ultraviolet (UV) properties of globular clusters, we present here a theoretical and observational analysis aimed at setting the framework for the determination of horizontal branch (HB) temperature distributions. Indeed this is crucial information needed to understand the physical parameters s…
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 …