Search Publications
A matched filter approach for blind joint detection of galaxy clusters in X-ray and SZ surveys
Arnaud, M.; Melin, J. -B.; Tarrío, P.
The combination of X-ray and Sunyaev-Zeldovich (SZ) observations can potentially improve the cluster detection efficiency, when compared to using only one of these probes, since both probe the same medium, the hot ionized gas of the intra-cluster medium. We present a method based on matched multifrequency filters (MMF) for detecting galaxy cluster…
Heating of the solar photosphere during a white-light flare
Kleint, Lucia; Kašparová, Jana; Jurčák, Jan +1 more
Context. The Fe I lines observed by the Hinode/SOT spectropolarimeter were always seen in absorption, apart from the extreme solar limb. Here we analyse a unique dataset capturing these lines in emission during a solar white-light flare.
Aims: We analyse the temperature stratification in the solar photosphere during a white-light flare and co…
Variability of extragalactic sources: its contribution to the link between ICRF and the future Gaia Celestial Reference Frame
Souchay, J.; Taris, F.; Andrei, A. +3 more
Context. The first release of the Gaia catalog is available since 14 September 2016. It is a first step in the realization of the future Gaia reference frame. This reference frame will be materialized by the optical positions of the sources and will be compared with and linked to the International Celestial Reference Frame, materialized by the rad…
The triple system HD 150136: From periastron passage to actual masses
Gosset, E.; Manfroid, J.; Sana, H. +6 more
Context. The triple system HD 150136 is composed of an O3 V((f*))-O3.5 V((f+)) primary, of an O5.5-6 V((f)) secondary, and of a more distant O6.5-7 V((f)) tertiary. The latter component went through periastron in 2015-2016, an event that will not occur again within the next eight years.
Aims: We aim to analyse the tertia…
FUV line emission, gas kinematics, and discovery of [Fe XXI] λ1354.1 in the sightline toward a filament in M87
Anderson, Michael E.; Sunyaev, Rashid
We present new Hubble Space Telescope - Cosmic Origins Spectrograph (HST-COS) G130M spectroscopy which we have obtained for a sightline toward a filament projected 1.9 kpc from the nucleus of M87, near the edge of the inner radio lobe to the east of the nucleus. The combination of the sensitivity of COS and the proximity of M87 allows us to study …
CXOU J160103.1-513353: another central compact object with a carbon atmosphere?
Santangelo, A.; Doroshenko, V.; Suleimanov, V.
We report on the analysis of XMM-Newton observations of the central compact object CXOU J160103.1-513353 located in the center of the non-thermally emitting supernova remnant (SNR) G330.2+1.0. The X-ray spectrum of the source is well described with either single-component carbon or two-component hydrogen atmosphere models. In the latter case, the …
The local rotation curve of the Milky Way based on SEGUE and RAVE data
Watson, F.; Munari, U.; Steinmetz, M. +13 more
Aims: We construct the rotation curve of the Milky Way in the extended solar neighbourhood using a sample of Sloan Extension for Galactic Understanding and Exploration (SEGUE) G-dwarfs. We investigate the rotation curve shape for the presence of any peculiarities just outside the solar radius as has been reported by some authors.
Methods…
Super lithium-rich K giant with low 12C to 13C ratio
Zhao, G.; Pan, K.; Gao, Q. +5 more
Context. The lithium abundances in a few percent of giants exceed the value predicted by the standard stellar evolution models, and the mechanisms of Li enhancement are still under debate. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey has obtained over six million spectra in the past five years, and thus provides a …
Ratio of black hole to galaxy mass of an extremely red dust-obscured galaxy at z = 2.52
Marconi, A.; Iwasawa, K.; Wang, W. -H. +7 more
We present a near-infrared (NIR) spectrum of WISE J104222.11+164115.3, an extremely red dust-obscured galaxy (DOG), which has been observed with the Long-slit Intermediate Resolution Infrared Spectrograph (LIRIS) on the 4.2m William Hershel Telescope. This object was selected as a hyper-luminous DOG candidate at z ∼ 2 by combining the optical and …
Chromospheric counterparts of solar transition region unresolved fine structure loops
De Pontieu, Bart; Hansteen, Viggo H.; Rouppe van der Voort, Luc +1 more
Low-lying loops have been discovered at the solar limb in transition region temperatures by the Interface Region Imaging Spectrograph (IRIS). They do not appear to reach coronal temperatures, and it has been suggested that they are the long-predicted unresolved fine structures (UFS). These loops are dynamic and believed to be visible during both h…