Search Publications
Catalog of candidates for quasars at 3 < z < 5.5 selected among X-Ray sources from the 3XMM-DR4 survey of the XMM-Newton observatory
Sazonov, S. Yu.; Khorunzhev, G. A.; Burenin, R. A. +1 more
We have compiled a catalog of 903 candidates for type 1 quasars at redshifts 3 < z < 5.5 selected among the X-ray sources of the "serendipitous" XMM-Newton survey presented in the 3XMMDR4 catalog (the median X-ray flux is ≈5 × 10-15 erg s-1 cm-2 in the 0.5-2 keV energy band) and located at high Galactic latit…
Globular cluster scale sizes in giant galaxies: orbital anisotropy and tidally underfilling clusters in M87, NGC 1399 and NGC 5128
Sills, Alison; Puzia, Thomas H.; Paolillo, Maurizio +4 more
We investigate the shallow increase in globular cluster half-light radii with projected galactocentric distance Rgc observed in the giant galaxies M87, NGC 1399, and NGC 5128. To model the trend in each galaxy, we explore the effects of orbital anisotropy and tidally underfilling clusters. While a strong degeneracy exists between the tw…
Realization of power law inflation & variants via variation of the strong coupling constant
AlHallak, M.; Chamoun, N.
We present a model of power law inflation generated by variation of the strong coupling constant. We then extend the model to two varying coupling constants which leads to a potential consisting of a linear combination of exponential terms. Some variants of the latter may be self-consistent and can accommodate the experimental data of the Planck 2…
Total infrared luminosity estimation from local galaxies in AKARI all sky survey
Takeuchi, T. T.; Pollo, A.; Solarz, A.
We aim to use the a new and improved version of AKARI all sky survey catalogue of far-infrared sources to recalibrate the formula to derive the total infrared luminosity. We cross-match the faint source catalogue (FSC) of IRAS with the new AKARI-FIS and obtained a sample of 2430 objects. Then we calculate the total infrared (TIR) luminosity L…
The faint end of the 250 µm luminosity function at z < 0.5
Wang, L.; Cooray, A.; Farrah, D. +12 more
Aims: We aim to study the 250 µm luminosity function (LF) down to much fainter luminosities than achieved by previous efforts.
Methods: We developed a modified stacking method to reconstruct the 250 µm LF using optically selected galaxies from the SDSS survey and Herschel maps of the GAMA equatorial fields and Stripe 82. Our …
Long-period Variations in the Radial Velocity of Spectroscopic Binary M Giant µ Ursae Majoris
Lee, Byeong-Cheol; Park, Myeong-Gu; Han, Inwoo +4 more
We report that the spectroscopic binary µ Ursae Majoris (µ UMa) has secondary RV variations of 471.2 days in addition to those of 230.0 days already known. Keplerian orbit analysis yields stellar mass companions of 1.6 M⊙ for the 230 day period and 0.14 M⊙ for the 471 day period. However, the HIPPARCOS photometrie…
The Multi-Temporal Database of Planetary Image Data (MUTED): A database to support the identification of surface changes and short-lived surface processes
Jaumann, R.; Hiesinger, H.; Erkeling, G. +3 more
Images of Mars taken by spacecraft in the last few decades indicate that the landscape has changed and that current processes are continuously changing the surface. The modifications of the landscape are caused by exogenic processes including eolian activity, mass movement, the growth and retreat of the polar caps, glacial processes and crater-for…
On the Rotation of Sunspots and Their Magnetic Polarity
Wang, Haimin; Yang, Zhiliang; Wang, Shuo +2 more
The rotation of sunspots of 2 yr in two different solar cycles is studied with the data from the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory and the Michelson Doppler Imager instrument on board the Solar and Heliospheric Observataory. We choose the α sunspot groups and the relatively large and stable sunspots of comple…
Statistical study on ultralow-frequency waves in the magnetotail lobe observed by Cluster
Zhang, T. L.; Volwerk, M.; Wang, G. Q.
Based on Cluster data, we investigate 263 waves with periods between 40 and 150 s (Pi2 band events) and 161 waves with periods between 150 and 600 s (Pc5 band events) in the magnetotail lobe. Our findings are as follows: (1) 90% of the mean wave amplitudes within 40-150 s (150-600 s) are below ~0.25 (0.36) nT for the transverse components and ~0.1…
Comparison of Hipparcos Trigonometric and Mount Wilson Spectroscopic Parallaxes for 90 Subgiants that Defined the Class in 1935
Majewski, Steven R.; Beaton, Rachael L.; Sandage, Allan
A history is given of the discovery between 1914 and 1935 of stars of intermediate luminosity between giants and dwarfs with spectral types between G0 to K3. The Mount Wilson spectroscopists identified about 90 such stars in their 1935 summary paper of spectroscopic absolute magnitudes for 4179 stars. Called “subgiants” by Strömberg, these 90 star…