Search Publications

The AKARI FIS Catalogue of YSOs and Extragalactic Objects

Marton, Gabor; Zahorecz, Sarolta; Toth, L. Viktor +2 more

The point sources in the Bright Source Catalogue of the AKARI Far-Infrared Surveyor (FIS) were classified based on their FIR and mid-IR fluxes and colours into young stellar object (YSO) and extragalactic source types using Quadratic Discriminant Analysis method (QDA) and Support Vector Machines (SVM). The reliability of the selection of YSO candi…

Models of Emission-Line Profiles and Spectral Energy Distributions to Characterize the Multi-Frequency Properties of Active Galactic Nuclei

La Mura, Giovanni; Berton, Marco; Chen, Sina +7 more

The spectra of active galactic nuclei (AGNs) are often characterized by a wealth of emission lines with different profiles and intensity ratios that lead to a complicated classification. Their electromagnetic radiation spans more than 10 orders of magnitude in frequency. In spite of the differences between various classes, the origin of their acti…

Akari All-Sky Bright Source Catalogue: Far-Infrared Luminous Quasars and the Optical Far-Infrared Correlation

Pearson, Chris; Serjeant, Stephen; Sedgwick, Chris +8 more

Properties of Dust Obscured Galaxies in the Nep-Deep Field

Burgarella, Denis; Pearson, Chris; Matsuhara, Hideo +5 more

We selected 47 DOGs at z∼1.5 using optical R (or r^{'}), AKARI 18 µm, and 24 µm color in the AKARI North Ecliptic Pole (NEP) Deep survey field. Using the colors among 3, 4, 7, and 9µm, we classified them into 3 groups; bump DOGs (23 sources), power-law DOGs (16 sources), and unknown DOGs (8 sources). We built spectral energy…

Comparison of some characteristics of comets 1P/Halley and 67P/Churyumov-Gerasimenko from the Vega and Rosetta mission data

Ksanfomality, L. V.

On March 6 and 9, 1986, for the first time in the history of science, the Russian spacecraft Vega-1 and -2 approached the nucleus of comet 1P/Halley and flew by at a small distance. A while later, on March 14, 1986, the Giotto spacecraft (European Space Agency (ESA)) followed them. Together with the Japanese spacecraft Suisei (Japan Aerospace Expl…

A study on missing lines in the synthetic solar spectrum near the Ca triplet

Coelho, Paula; Kitamura, Jessica R.; Martins, Lucimara P.

Synthetic stellar spectra are extensively used for many different applications in astronomy, from stellar studies (such as in the determination of atmospheric parameters of observed stellar spectra), to extragalactic studies (e.g. as one of the main ingredients of stellar population models). One of the main ingredients of synthetic spectral librar…

Cosmic microwave background science at commercial airline altitudes

Peiris, Hiranya V.; Verde, Licia; Feeney, Stephen M. +2 more

Obtaining high-sensitivity measurements of degree-scale cosmic microwave background (CMB) polarization is the most direct path to detecting primordial gravitational waves. Robustly recovering any primordial signal from the dominant foreground emission will require high-fidelity observations at multiple frequencies, with excellent control of system…

Accurate Orbital Solution for the New and Metal-poor Eclipsing Binary Tycho 5227-1023-1

Munari, U.; Zwitter, T.; Traven, G. +1 more

The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution échelle spectroscopy and V,{I}^\prime photometry. A synthetic spectral analysis of both components has be…

Evidence for coherent spicule oscillations from correcting Hinode/SOT Ca II H in the south-east limb of the Sun

Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A.

Wave theories of heating of the chromosphere, corona and solar wind due to photospheric fluctuations are strengthened by the existence of the wave coherency observed up to the transition region. The coherency of intensity oscillations of solar spicules was explored using the Solar Optical Telescope (SOT) on the Hinode spacecraft with increasing he…

Probing the nature of dark matter with deep XMM-Newton observations of the dwarf spheroidal galaxies

Boyarsky, A.; Ruchayskiy, O.

We report the results of the very large program with XMM-Newton (AO-14) devoted to deep observation of Draco dwarf spheroidal galaxy. The p-n junction (PN) camera shows a positive spectral feature at E = 3.54 ± 0.06 with a 2.3σ significance. The two Metal Oxide Semi-conductor (MOS) cameras show less-significant or no positive deviations, consisten…