Search Publications
A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population
Andreani, P.; Yun, M. S.; Clements, D. L. +19 more
Dusty star-forming galaxies (DSFGs) detected at z > 4 provide important examples of the first generations of massive galaxies. However, few examples with spectroscopic confirmation are currently known, with Hershel struggling to detect significant numbers of z > 6 DSFGs. NGP6_D1 is a bright 850 µm source (12.3 ± 2.5 mJy) with no counte…
Axisymmetric density waves in Saturn's rings
Nicholson, P. D.; Hedman, M. M.
Density waves in Saturn's rings are usually tightly wrapped spiral patterns generated by resonances with either Saturn's moons or structures inside the planet. However, between the Barnard and Bessel Gaps in the Cassini Division (i.e. between 120 240 and 120 300 km from Saturn's spin axis), there are density variations that appear to form an axisy…
A nearby luminous AGN sample optically selected from Hubble Space Telescope
Li, Shuang-Liang
In this work, a nearby luminous active galactic nucleus (AGN) sample is selected from Hubble Space Telescope(HST), where only sources with both X-ray emission observed by Chandra/XMM-Newton and radio flux detected by Very Large Array (VLA)/Very Long Baseline Array (VLBA)/very long baseline interferometry (VLBI)/Multi-Element Radio Linked Interfero…
The Ursa Major Moving Group: a chronochemokinematic analysis
Sneden, C.; Dopcke, Gustavo; Porto de Mello, G. F.
Stars in kinematic groups are believed to share the same age, metallicity, and velocity vectors, and are disrupted by events such as encounters with massive objects, leaving a residue of stars sharing the same kinematic properties, thus bridging an important evolutionary gap between clusters and field stars. We determine the most likely metallicit…
Multifilter time-series observations of three short period ATLAS variable stars
Koen, Chris
The `Asteroid Terrestrial-impact Last Alert System' discovered hundreds of thousands of new candidate variable stars. Follow-up observations of three of these are reported in this paper. The targets were selected on the basis of having high probability of being periodic (false alarm probability for period detection smaller than 10-5), s…
Kinematics of subclusters in star cluster complexes: imprint of their parental molecular clouds
Fujii, M. S.
Star cluster complexes such as the Carina Nebula could have formed in turbulent giant molecular clouds. We perform a series of N-body simulations starting from subclustering initial conditions based on hydrodynamic simulations of turbulent molecular clouds. These simulations finally result in the formation of star cluster complexes consisting of s…
Non-thermal emission from massive star-forming regions: a possible SNR candidate G351.7-1.2?
Vig, S.; Ghosh, S. K.; Lal, D. V. +3 more
We present low-frequency wideband observations (300-500 MHz) of the star-forming complex G351.7-1.2 using upgraded Giant Metrewave Radio Telescope (uGMRT), India. Combining this with the optical, infrared, and submillimetre data, we analyse the large-scale diffuse radio emission associated with the region that exhibits a broken shell morphology. T…
X-ray and radio studies of SNR CTB 37B hosting the magnetar CXOU J171405.7-381031
Safi-Harb, Samar; Kothes, Roland; Gotthelf, Eric V. +2 more
We present a Chandra and XMM-Newton study of the supernova remnant (SNR) CTB 37B, along with archival radio observations. In radio wavelengths, the SNR CTB 37B is an incomplete shell showing bright emission from the eastern side, while the X-ray morphology shows diffuse emission from regions surrounding the magnetar CXOU J171405.7-381031. We used …
Multifractal detrended moving average analysis of Kepler stars with surface differential rotation traces
De Medeiros, J. R.; de Freitas, D. B.; Das Chagas, M. L. +2 more
A multifractal formalism is employed to analyse high-precision time-series data of Kepler stars with surface differential rotation (DR) traces. The multifractal detrended moving average (MFDMA) algorithm has been explored to characterize the multiscale behaviour of the observed time series from a sample of 662 stars selected with parameters close …
SN 2016B a.k.a. ASASSN-16ab: a transitional Type II supernova
Pandey, S. B.; Benetti, S.; Kumar, Brajesh +12 more
We present photometry, polarimetry, and spectroscopy of the Type II supernova ASASSN-16ab/SN 2016B in PGC 037392. The photometric and spectroscopic follow-up commenced about 2 weeks after shock breakout and continued until nearly 6 months. The light curve of SN 2016B exhibits intermediate properties between those of Type IIP and IIL. The early dec…