Search Publications
New Double Periodic Variable stars in the ASAS-SN Catalog
Mennickent, R. E.; Rosales, J. A.
We report the discovery of 3 new Double Periodic Variables based on the analysis of ASAS-SN light curves: GSD J11630570-510306, V593 Sco and TYC 6939-678-1. These systems have orbital periods between 10 and 20 days and long cycles between 300 and 600 days.
Ultraviolet photo-ionisation in far-infrared selected sources
Curran, S. J.; Duchesne, S. W.
It has been reported that there is a deficit of stellar heated dust, as evident from the lack of far-infrared (FIR) emission, in sources within the Herschel-SPIRE sample with X-ray luminosities exceeding a critical value of LX ∼ 1037 W. Such a scenario would be consistent with the suppression of star formation by the AGN, req…
Discovery of Two Quasars at z = 5 from the OGLE Survey
Greiner, J.; Soszyński, I.; Udalski, A. +17 more
We used Optical Gravitational Lensing Experiment (OGLE-IV) deep (stacked) images (V ≲ 23 mag, I ≲ 23 mag at 3σ) of the Magellanic System, encompassing an area of ∼670 deg2, to perform a search for high-z quasar candidates. We combined the optical OGLE data with the mid-IR Wide-field Infrared Survey Explorer 3.4/4.6/12 µm data, and…
Adaptive Grid Lens Modeling of the Cosmic Horseshoe Using Hubble Space Telescope Imaging
Cui, Wei; Li, Guoliang; Wiesner, Matthew P. +3 more
The Cosmic Horseshoe gravitational lensing system is an extraordinary example of strong gravitational lensing both due to the nearly complete Einstein ring formed in this system and due to the star-forming nature of the lensed z = 2.38 Lyman-break galaxy. In this paper, we describe the development of a new lens modeling package and the lens models…
Unification of strongly magnetized neutron stars with regard to X‑ray emission from hot spots
Hayashida, K.; Nakajima, H.; Matsumoto, H. +1 more
Strongly magnetized isolated neutron stars (NSs) are categorized into two families according, mainly, to their magnetic field strength. The one with a higher magnetic field of 1014–1015 Gauss is called "magnetar," and the other is the X‑ray isolated neutron star (XINS) with 1013 Gauss. Both magnetars and XINSs show thermal emission in X‑rays, whos…
Photometry and colour index of Comet 67P/Churyumov-Gerasimenko on 2015 December 12
Lasue, J.; Sen, A. K.; Gupta, R. +3 more
Comet 67P/Churyumov-Gerasimenko (hereafter, 67P) was observed on 2015 December 12, from 2 m Himalayan Chandra Telescope in India in photometry to study its dust properties, using Bessell R and I filters. We study the photometric images to highlight coma structures and jets. The radial decrease in intensity in the different coma structures is compa…
Suzaku observation of Jupiter's X-rays around solar maximum
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +6 more
We report on results of imaging and spectral studies of X-ray emission from Jupiter observed by Suzaku. In 2006, Suzaku found diffuse X-ray emission in 1-5 keV associated with Jovian inner radiation belts. It has been suggested that the emission is caused by the inverse-Compton scattering by ultra-relativistic electrons (∼50 MeV) in Jupiter's magn…
Resource potential and planning for exploration of the Hebrus Valles, Mars
Yadav, Santosh Kumar; Srivastava, Neeraj; Sharma, Ravi
Mars is the only extraterrestrial body which could host primitive lifeforms and also has the potential to host a human base in the near future. Towards fulfilling these objectives, several remote sensing missions and rover based missions have been sent to Mars. Still, confirmation of existing or extinct life on this planet in any form has not been…
Far-infrared dust properties of highly dust-obscured active galactic nuclei from the AKARI and WISE all-sky surveys
Malkan, Matthew; Lam, Anson; Wright, Edward
The combination of the AKARI and WISE infrared all-sky surveys provides a unique opportunity to identify and characterize the most highly dust-obscured active galactic nuclei (AGNs) in the universe. Dust-obscured AGNs are not easily detectable and are potentially underrepresented in extragalactic surveys due to their high optical extinction, but a…
The Gemini/HST Galaxy Cluster Project: Environment Effects on the Stellar Populations in the Lynx Clusters at z = 1.27
Toft, Sune; Jørgensen, Inger; Hunter, Laura C. +4 more
Few detailed investigations of stellar populations in passive galaxies beyond z ≈ 1 are based on deep spectroscopic observations, due to the difficulty in obtaining such data. We present a study of stellar populations, structure, and mass-to-light ratios (M/L) of a large sample of bulge-dominated galaxies in the two z = 1.27 clusters Lynx E and Ly…