Search Publications
To v∞ and beyond! The He I absorption variability across the 2014.6 periastron passage of η Carinae
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +11 more
We have monitored the massive binary star η Carinae with the CTIO/Small and Moderate Aperture Research Telescope System 1.5 m telescope and CHIRON spectrograph from the previous apastron passage of the system through the recent 2014.6 periastron passage. Our monitoring has resulted in a large, homogeneous data set with an unprecedented time-sampli…
Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +2 more
We consider an inhomogeneous model and independently an anisotropic model of primordial power spectrum in order to describe the observed hemispherical anisotropy in cosmic microwave background radiation (CMBR). This anisotropy can be parametrized in terms of the dipole modulation model of the temperature field. Both the models lead to correlations…
Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL
Sunyaev, Rashid A.; Tsygankov, Sergey S.; Lutovinov, Alexander A. +4 more
We report the results of the deepest Galactic plane (|b| < 17.5°) survey in the 67.9 and 78.4 keV nuclear de-excitation lines of titanium-44 (44Ti) performed using the data acquired with the IBIS/ISGRI instrument onboard the INTEGRAL satellite during 12 yr of operation. The peak sensitivity of our survey reached an unprecedented leve…
INTEGRAL/IBIS deep extragalactic survey: M81, LMC and 3C 273/Coma fields
Sunyaev, Rashid A.; Lutovinov, Alexander A.; Sazonov, Sergey Yu. +3 more
We present results of a deep survey of three extragalactic fields, M81 (exposure of 9.7 Ms), Large Magellanic Cloud (6.8 Ms) and 3C 273/Coma (9.3 Ms), in the hard X-ray (17-60 keV) energy band with the IBIS telescope onboard the INTEGRAL observatory, based on 12 years of observations (2003-2015). The combined survey reaches a 4σ peak sensitivity o…
Identifying IGR J14091-6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations
Strader, Jay; Chomiuk, Laura; Rahoui, Farid +3 more
INTEGRAL Gamma-Ray (IGR) J14091-6108 is a Galactic X-ray source known to have an iron emission line, a hard X-ray spectrum, and an optical counterpart. Here, we report on X-ray observations of the source with XMM-Newton and NuSTAR as well as optical spectroscopy with European Southern Obseratory/Very Large Telescope and National Optical Astronomy …
Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
Heywood, I.; Vaughan, S.; Hardcastle, M. J. +15 more
We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift of z = 0.0897 for the E0-type host galaxy, 2MASX J08231289+0333016, leading to Mr = -22.6 and a 1.4 GHz radio luminosi…
The dustier early-type galaxies deviate from late-type galaxies' scaling relations
Barmby, P.; Madden, S. C.; Lianou, S. +1 more
Several dedicated surveys focusing on early-type galaxies (ETGs) reveal that significant fractions of them are detectable in all interstellar medium phases studied to date. We select ETGs from the Herschel Reference Survey that have both far-infrared Herschel and either H I or CO detection (or both). We derive their star formation rates (SFRs), st…
Variations in cometary dust composition from Giotto to Rosetta, clues to their formation mechanisms
Langevin, Yves; Fischer, Henning; Briois, Christelle +18 more
This paper reviews the current knowledge on the composition of cometary dust (ice, minerals and organics) in order to constrain their origin and formation mechanisms. Comets have been investigated by astronomical observations, space missions (Giotto to Rosetta), and by the analysis of cometary dust particles collected on Earth, chondritic porous i…
Systematic or signal? How dark matter misalignments can bias strong lensing models of galaxy clusters
Kneib, J. P.; Jauzac, M.; Harvey, D.
We explore how assuming that mass traces light in strong gravitational lensing models can lead to systematic errors in the predicted position of multiple images. Using a model based on the galaxy cluster MACS J0416 (z = 0.397) from the Hubble Frontier Fields, we split each galactic halo into a baryonic and dark matter component. We then shift the …
Interstellar dust distribution outside the heliopause: deflection at the heliospheric interface
Katushkina, O. A.; Izmodenov, V. V.; Alexashov, D. B. +1 more
We developed a numerical model of the interstellar dust distribution in the global heliosphere including the heliospheric interface, where the solar wind plasma interacts with the local interstellar plasma. The model is based on the plasma distributions obtained by the 3D kinetic-magnetohydrodynamic model of the heliospheric interface developed by…