Search Publications
INTEGRAL results on the electron-positron annihilation radiation and X-ray & Gamma-ray diffuse emission of the Milky Way
Churazov, Eugene; Sunyaev, Rashid; Knödlseder, Jürgen +8 more
This review summarizes INTEGRAL results on two topics: the electron-positron annihilation line and X-ray & Gamma-ray diffuse emission of the Milky Way.
The electron-positron annihilation line at 511 keV is the most prominent spectral feature in the gamma-ray spectrum of the Milky Way. From the observational perspective, INTEGRAL has alrea…ROBO-AO Kepler Asteroseismic Survey. II. Do Stellar Companions Inhibit Stellar Oscillations?
Kulkarni, S. R.; Baranec, Christoph; Duev, Dmitry A. +7 more
The Kepler Space Telescope observed over 15,000 stars for asteroseismic studies. Of these, 75% of dwarfs (and 8% of giants) were found to show anomalous behavior, such as suppressed oscillations (low amplitude) or no oscillations at all. The lack of solar-like oscillations may be a consequence of multiplicity, due to physical interactions with spe…
Keck Cosmic Web Imager (KCWI) spectra of globular clusters and ultracompact dwarfs in the halo of M87
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +2 more
Using the Keck Cosmic Web Imager, we obtain spectra of several globular clusters (GCs), ultracompact dwarfs (UCDs), and the inner halo starlight of M87, at a similar projected galactocentric radius of ~5 kpc. This enables us, for the first time, to apply the same stellar population analysis to the GCs, UCDs, and starlight consistently to derive ag…
Infrared properties of planetary nebulae with [WR] and wels central stars
Parthasarathy, M.; Muthumariappan, C.
We report the infrared (IR) properties of planetary nebulae (PNe) with Wolf-Rayet (WR) type and wels central stars known to date and compare them with the IR properties of a sample of PNe with H-rich central stars. We use near-, mid-, and far-IR photometric data from archives to derive the IR properties of PNe. We have constructed IR colour-colour…
Hot gaseous atmospheres of rotating galaxies observed with XMM-Newton
Gaspari, M.; Nulsen, P. E. J.; Donahue, M. +6 more
X-ray emitting atmospheres of non-rotating early-type galaxies and their connection to central active galactic nuclei have been thoroughly studied over the years. However, in systems with significant angular momentum, processes of heating and cooling are likely to proceed differently. We present an analysis of the hot atmospheres of six lenticular…
Ground-based visible spectroscopy of asteroids to support the development of an unsupervised Gaia asteroid taxonomy
Tanga, P.; Galluccio, L.; Cellino, A. +4 more
Context. The Gaia mission of the European Space Agency is measuring reflectance spectra of a number to the order of 105 small Solar System objects. A first sample will be published in the Gaia Data Release scheduled for 2021.
Aims: The aim of our work was to test the procedure developed to obtain taxonomic classifications for aster…
Pulsational properties of ten new slowly pulsating B stars
Paunzen, E.; Fedurco, M.; Bernhard, K. +2 more
Context. Slowly pulsating B (SPB) stars are upper main-sequence multi-periodic pulsators that show non-radial g-mode oscillations driven by the κ mechanism acting on the iron bump. These multi-periodic pulsators have great asteroseismic potential and can be employed for the calibration of stellar structure and evolution models of massive stars.
Resolved observations at 31 GHz of spinning dust emissivity variations in ρ Oph
Bond, J. Richard; Hensley, Brandon S.; Casassus, Simon +9 more
The ρ Oph molecular cloud is one of the best examples of spinning dust emission, first detected by the cosmic background imager (CBI). Here, we present 4.5 arcmin observations with CBI 2 that confirm 31 GHz emission from ρ Oph W, the PDR exposed to B-type star HD 147889, and highlight the absence of signal from S1, the brightest IR nebula in the c…
Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects. II
Oliveira, A. S.; Rodrigues, C. V.; Martins, M. +4 more
This is the second paper of a series presenting our search for magnetic cataclysmic variables (mCVs) among candidates selected mostly from the Catalina Real-Time Transient Survey. We present the identification spectra, obtained at the SOAR Telescope, as well as magnitudes and Gaia distances for 45 objects. Of these, 39 objects are identified as CV…
Extreme ultraviolet quasar colours from GALEX observations of the SDSS DR14Q catalogue
Wu, Jian; Vanden Berk, Daniel E.; Wesolowski, Sarah C. +4 more
The rest-frame far to extreme ultraviolet (UV) colour-redshift relationship has been constructed from data on over $480\, 000$ quasars carefully cross-matched between SDSS Data Release 14 and the final GALEX photometric catalogue. UV matching and detection probabilities are given for all the quasars, including dependencies on separation, optical b…