Search Publications
Insights from Synthetic Star-forming Regions. II. Verifying Dust Surface Density, Dust Temperature, and Gas Mass Measurements with Modified Blackbody Fitting
Dale, James E.; Robitaille, Thomas P.; Koepferl, Christine M.
We use a large data set of realistic synthetic observations (produced in Paper I of this series) to assess how observational techniques affect the measurement physical properties of star-forming regions. In this part of the series (Paper II), we explore the reliability of the measured total gas mass, dust surface density and dust temperature maps …
A Radio Emission Analysis of Classical Nova V351 Pup (1991)
Strader, Jay; Chomiuk, Laura; Finzell, Thomas +2 more
Previously, Nova Puppis 1991 (V351 Pup) was measured to host one of the most massive ejections claimed in the literature. Multi-frequency radio detections from one epoch were published for this nova in the 1990's; and yet, the remaining data collected by the Karl G. Jansky Very Large Array (VLA) have remained unpublished. In this paper, we analyze…
Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31
Lien, A.; Lehmer, B. D.; Hornschemeier, A. E. +15 more
We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR-Swift observation. We find that this source is the counterpart to Swift J0042.6+4112, which was previously detected in the Swift BAT All-sky Hard X-ray Survey. This Swift BAT source had been suggested to be the combined emiss…
Investigating the Evolution of the Dual AGN System ESO 509-IG066
Harrison, F. A.; Stern, D.; Treister, E. +13 more
We analyze the evolution of the dual active galactic nucleus (AGN) in ESO 509-IG066, a galaxy pair located at z = 0.034 whose nuclei are separated by 11 kpc. Previous observations with XMM-Newton on this dual AGN found evidence for two moderately obscured ({N}{{H}} ∼ 1022 cm-2) X-ray luminous ({L}{{X}} ∼…
Exploring the Helium Core of the δ Scuti Star CoRoT 102749568 with Asteroseismology
Li, Yan; Chen, Xinghao; Chen, Yanhui +2 more
Based on regularities in rotational splitting, we seek possible multiplets for the observed frequencies of CoRoT 102749568. There are 21 sets of multiplets identified, including four sets of multiplets with l = 1, nine sets of multiplets with l = 2, and eight sets of multiplets with l = 3. In particular, there are three complete triplets (f10…
A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku
Katsuda, Satoru; Vink, Jacco; Bamba, Aya +2 more
Diffusive shock acceleration by the shockwaves in supernova remnants (SNRs) is widely accepted as the dominant source for Galactic cosmic rays. However, it is unknown what determines the maximum energy of accelerated particles. The surrounding environment could be one of the key parameters. The SNR RCW 86 shows both thermal and nonthermal X-ray em…
Optical and UV Spectra of the Remnant of SN 1885 (S And) in M31
Fesen, Robert A.; Hamilton, Andrew J. S.; Weil, Kathryn E. +1 more
We present multi-slit, 1D and 2D optical and UV spectra of the remnant of supernova 1885 (SN 1885; S And) taken using the Hubble Space Telescope’s Imaging Spectrograph (HST/STIS). These spectra of this probable subluminous Type Ia remnant, seen in silhouette against the central bulge of the Andromeda galaxy (M31), show strong and broad absorptions…
Lessons Learned from the Three-view Determination of CME Mass
de Koning, Curt A.
With only single-viewpoint, total-brightness images, it is not possible to calculate the true mass of a coronal mass ejection (CME) because total-brightness images do not contain any depth information. If two viewpoints are available, it has been suggested that total-brightness images might be used to simultaneously derive the CME deprojected mass…
“Dandelion” Filament Eruption and Coronal Waves Associated with a Solar Flare on 2011 February 16
Shibata, Kazunari; Takasao, Shinsuke; Ishii, Takako T. +11 more
Coronal disturbances associated with solar flares, such as Hα Moreton waves, X-ray waves, and extreme ultraviolet (EUV) coronal waves, are discussed herein in relation to magnetohydrodynamic fast-mode waves or shocks in the corona. To understand the mechanism of coronal disturbances, full-disk solar observations with high spatial and temporal reso…
XMM-Newton X-Ray Observations of LkCa 15: A T Tauri Star with a Formative Planetary System
Skinner, Stephen L.; Güdel, Manuel
High-resolution ground-based images of the T Tauri star LkCa 15 have revealed multiple companions that are thought to comprise a formative planetary system. The candidate protoplanets orbit at distances of ∼15-20 au within the dust-depleted inner region of the circumstellar disk. Because of its young age (∼1-4 Myr), LkCa 15 provides a benchmark sy…