Search Publications

New Photometric Investigation of the Solar-Type Shallow-Contact Binary HH Bootis

He, Jia-jia; Wang, Jing-jing

Four-color charge-coupled device (CCD) light curves in $B$, $V$, $Rc$ and $Ic$ bands of the total-eclipsing binary system, V1853 Ori, are presented. By comparing our light curves with those published by previous investigators, it is detected that the O'Connell effect on the light curves is disappeared. By analyzing those multi-color light curves w…

GRB 130603B: No Compelling Evidence for Neutron Star Merger

Dar, Arnon; Dado, Shlomo

Near infrared (NIR) flare/rebrightening in the afterglow of the short hard gamma ray burst (SHB) 130603B measured with the Hubble Space Telescope (HST) and an alleged late-time X-ray excess were interpreted as possible evidence of a neutron-star merger origin of this SHB. However, the X-ray afterglow that was measured with the Swift-XRT and Newton…

Variations in EUV Irradiance: Comparison between LYRA, ESP, and SWAP Integrated Flux

Poedts, Stefaan; Yalim, Mehmet Sarp

The Sun Watcher Using Active Pixel System Detector and Image Processing (SWAP) telescope and Large Yield Radiometer (LYRA) are the two Sun observation instruments on-board PROBA2. SWAP extreme ultraviolet images, if presented in terms of the integrated flux over solar disk, in general, correlate well with LYRA channel 2-4 (zirconium filter) and ch…

Observations of Anomalous Microwave Emission from HII Regions

Dickinson, Clive

In this brief review, I give a summary of the observations of Anomalous Microwave Emission (AME) from HII regions. AME has been detected in, or in the vicinity of, HII regions. Given the difficulties in measuring accurate SEDs over a wide range of frequencies and in complex environments, many of these detections require more data to confirm them a…

Investigating the Source of Planck-Detected AME: High-Resolution Observations at 15 GHz

Grainge, Keith J. B.; Hurley-Walker, Natasha; Scaife, Anna M. M. +1 more

The Planck 28.5 GHz maps were searched for potential Anomalous Microwave Emission (AME) regions on the scale of $\sim3^{\circ}$ or smaller, and several new regions of interest were selected. Ancillary data at both lower and higher frequencies were used to construct spectral energy distributions (SEDs), which seem to confirm an excess consistent wi…

Are Nuclear Star Clusters the Precursors of Massive Black Holes?

Neumayer, Nadine; Walcher, C. Jakob

We present new upper limits for black hole masses in extremely late type spiral galaxies. We confirm that this class of galaxies has black holes with masses less than 10^6 Msolar, if any. We also derive new upper limits for nuclear star cluster (NC) masses in massive galaxies with previously determined black hole masses. We use the newly derived u…

The Impact of Polarized Extragalactic Radio Sources on the Detection of CMB Anisotropies in Polarization

Tucci, Marco; Toffolatti, Luigi

Recent polarimetric surveys of extragalactic radio sources (ERS) at frequencies \nu>1GHz are reviewed. By exploiting all the most relevant data on the polarized emission of ERS we study the frequency dependence of polarization properties of ERS between 1.4 and 86GHz. For flat-spectrum sources the median (mean) fractional polarization increases …

Observations of the Polarisation of the Anomalous Microwave Emission: A Review

Rebolo, R.; Rubiño-Martín, J. A.; Génova-Santos, R. +1 more

Do Nuclear Star Clusters and Supermassive Black Holes Follow the Same Host-Galaxy Correlations?

Erwin, Peter; Gadotti, Dimitri Alexei

Studies have suggested that there is a strong correlation between the masses of nuclear star clusters (NSCs) and their host galaxies, a correlation which said to be an extension of the well-known correlations between supermassive black holes (SMBHs) and their host galaxies. But careful analysis of disk galaxies -- including 2D bulge/disk/bar decom…

AGN Triggering in the Infall Regions of Distant X-Ray Luminous Galaxy Clusters at 0.9 < z <~ 1.6

Šuhada, R.; Fassbender, R.; Nastasi, A.

Observational constraints on the average radial distribution profile of AGN in distant galaxy clusters can provide important clues on the triggering mechanisms of AGN activity in dense environments and are essential for a completeness evaluation of cluster selection techniques in the X-ray and mm-wavebands. The aim of this work is a statistical st…