Search Publications
Simultaneous Multiwavelength Observations of V404 Cygni during its 2015 June Outburst Decay Strengthen the Case for an Extremely Energetic Jet-base
Maccarone, Thomas J.; Grinberg, Victoria; Reynolds, Mark T. +4 more
We present results of multiband optical photometry of the black hole X-ray binary system V404 Cyg obtained using Wheaton College Observatory’s 0.3 m telescope, along with strictly simultaneous INTEGRAL and Swift observations during 2015 June 25.15-26.33 UT, and 2015 June 27.10-27.34 UT. These observations were made during the 2015 June outburst of…
Reverberation Mapping of PG 0934+013 with the Southern African Large Telescope
Barth, Aaron J.; Im, Myungshin; Jeon, Yiseul +10 more
We present the variability and time-lag measurements of PG 0934+013 based on a photometric and spectroscopic monitoring campaign over a two year period. We obtained 46 epochs of data from the spectroscopic campaign, which was carried out using the Southern African Large Telescope with ∼1 week cadence over two sets of four month-long observing peri…
A Spectroscopic Orbit for the Late-type Be Star β CMi
Wang, Luqian; Klement, Robert; Richardson, Noel D. +12 more
The late-type Be star β CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al. These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al. suggest is evidence for an unseen binary companion in orbit. …
Evolution of Dust-obscured Star Formation and Gas to z = 2.2 from HiZELS
Thomson, A. P.; Smail, Ian; Ibar, E. +6 more
We investigate the far-infrared (far-IR) properties of galaxies selected via deep, narrow-band imaging of the Hα emission line in four redshift slices from z=0.40{--}2.23 over ∼1 deg2 as part of the High-redshift Emission Line Survey (HiZELS). We use a stacking approach in the Herschel PACS/SPIRE far-IR bands, along with 850 µ {{m…
High-resolution Observations of a White-light Flare with NST
Cho, K. -S.; Xu, Y.; Yurchyshyn, V. +4 more
Using high-resolution data from the New Solar Telescope, we studied fine spatial and temporal details of an M1.3 white-light (WL) flare, which was one of three homologous solar flares (C6.8, M1.3, and M2.3) observed in close proximity to the west solar limb on 2014 October 29 in NOAA active region 12192. We report that the TiO WL flare consists of…
Development of a Full Ice-cream Cone Model for Halo Coronal Mass Ejections
Moon, Y. -J.; Lee, Harim; Na, Hyeonock
It is essential to determine three-dimensional parameters (e.g., radial speed, angular width, and source location) of coronal mass ejections (CMEs) for the space weather forecast. In this study, we investigate which cone type represents a halo CME morphology using 29 CMEs (12 Solar and Heliospheric Observatory (SOHO)/Large Angle and Spectrometric …
On the Binary Nature of Massive Blue Hypergiants: High-resolution X-Ray Spectroscopy Suggests That Cyg OB2 12 is a Colliding Wind Binary
Hamann, W. -R.; Oskinova, L. M.; Ignace, R. +5 more
The blue hypergiant Cyg OB2 12 (B3Ia+) is a representative member of the class of very massive stars in a poorly understood evolutionary stage. We obtained its high-resolution X-ray spectrum using the Chandra observatory. PoWR model atmospheres were calculated to provide realistic wind opacities and to establish the wind density structu…
The First Detection of a Pulsar with ALMA
de Luca, A.; Possenti, A.; Burgay, M. +8 more
Although there is a general consensus on the fact that pulsars’ radio emission is coherent in nature, whereas the emission from the optical to high-energy γ-rays is due to incoherent processes, it has not been established yet at which wavelengths the transition occurs, which is key information for all emission models of pulsar magnetospheres. Of c…
A Tale of Two Impostors: SN2002kg and SN1954J in NGC 2403
Van Dyk, Schuyler D.; Humphreys, Roberta M.; Davidson, Kris +1 more
We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12) and SN 2002kg(V37). For the famous object SN 1954J, we combine four critical observations: its current SED, its Hα emission line profile, the Ca II triplet in absorption in its red spectrum, and the brightness compared to its pre-event state. Together, these strongly sug…
ALMA Observations of the Gravitational Lens SDP.9
Tamura, Yoichi; Oguri, Masamune; Matsushita, Satoki +3 more
We present long-baseline ALMA observations of the strong gravitational lens H-ATLAS J090740.0-004200 (SDP.9), which consists of an elliptical galaxy at {z}{{L}}=0.6129 lensing a background submillimeter galaxy into two extended arcs. The data include Band 6 continuum observations, as well as CO J = 6-5 molecular line observations, from …