Search Publications
Multi-wavelength Emission from the Fermi Bubble. III. Stochastic (Fermi) Re-acceleration of Relativistic Electrons Emitted by SNRs
Cheng, K. S.; Chernyshov, D. O.; Dogiel, V. A. +1 more
We analyze the model of stochastic re-acceleration of electrons that are emitted by supernova remnants (SNRs) in the Galactic Disk and then propagate into the Galactic Halo in order to explain the origin of nonthermal (radio and gamma-ray) emission from Fermi bubbles (FB). We assume that the energy for re-acceleration in the Halo is supplied by sh…
Resolved Millimeter Emission from the HD 15115 Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Wilner, David J. +1 more
We have used the Submillimeter Array (SMA) to make 1.3 mm observations of the debris disk surrounding HD 15115, an F-type star with a putative membership in the β Pictoris moving group. This nearly edge-on debris disk shows an extreme asymmetry in optical scattered light, with an extent almost two times larger to the west of the star than to the e…
Exploring the Intrabinary Shock from the Redback Millisecond Pulsar PSR J2129-0429
Cheng, K. S.; Takata, J.; Kong, A. K. H. +7 more
We have investigated the intrabinary shock emission from the redback millisecond pulsar PSR J2129-0429 with XMM-Newton and Fermi. Orbital modulation in X-ray and UV can be clearly seen. The X-ray modulation of this pulsar has a double-peaked structure with a dip in between. The observed X-rays are non-thermal dominant and can be modeled by a power…
Indications of R-mode Oscillations in SOHO/MDI Solar Radius Measurements
Scargle, J. D.; Gough, D. O.; Sturrock, P. A. +1 more
Analysis of solar radius measurements acquired by the Michelson Doppler Imager on the Solar and Heliospheric Observatory spacecraft supports previously reported evidence of solar internal r-mode oscillations in Mt Wilson radius data and in 90Sr beta-decay data. The frequencies of these oscillations are compatible with oscillations in a …
Physical Conditions of Coronal Plasma at the Transit of a Shock Driven by a Coronal Mass Ejection
Bemporad, A.; Susino, R.; Mancuso, S.
We report here on the determination of plasma physical parameters across a shock driven by a coronal mass ejection using white light (WL) coronagraphic images and radio dynamic spectra (RDS). The event analyzed here is the spectacular eruption that occurred on 2011 June 7, a fast CME followed by the ejection of columns of chromospheric plasma, par…
Short- and Long-Term Radio Variability of Young Stars in The Orion Nebula Cluster and Molecular Cloud
Martín-Pintado, J.; Sanz-Forcada, J.; Chandler, C. J. +3 more
We have used the Karl G. Jansky Very Large Array (VLA) to carry out multi-epoch radio continuum monitoring of the Orion Nebula Cluster (ONC) and the background Orion Molecular Cloud (OMC; 3 epochs at Q band and 11 epochs at Ka band). Our new observations reveal the presence of 19 radio sources, mainly concentrated in the Trapezium Cluster and the …
N49: The First Robust Discovery of Recombining Plasma in an Extra-galactic Supernova Remnant
Yamaguchi, Hiroya; Koyama, Katsuji; Uchida, Hiroyuki
Recent discoveries of recombining plasmas (RPs) in supernova remnants (SNRs) have dramatically changed our understanding of SNR evolution. To date, a dozen RP SNRs have been identified in the Galaxy. Here, we present Suzaku deep observations of four SNRs in the LMC, namely, N49, N49B, N23, and DEM L71, for accurate determination of their plasma st…
Herschel* Observations of Interstellar Chloronium. II. - Detections toward G29.96-0.02, W49N, W51, and W3(OH), and Determinations of the Ortho-to-Para and 35Cl/37Cl Isotopic Ratios
Menten, Karl M.; Neufeld, David A.; Herbst, Eric +14 more
We report additional detections of the chloronium molecular ion, H2Cl+, toward four bright submillimeter continuum sources: G29.96-0.02, W49N, W51, and W3(OH). With the use of the HIFI instrument on board the Herschel Space Observatory, we observed the {2}12-{1}01 transition of ortho-H{}2…
The Three-mm Ultimate Mopra Milky Way Survey. II.Cloud and Star Formation near the Filamentary Ministarburst RCW 106
Martin, Peter G.; Fuller, Gary A.; Barnes, Peter J. +10 more
We report here a study of gas, dust, and star formation rates (SFRs) in the molecular cloud complexes (MCCs) surrounding the giant H ii region RCW 106 using 12CO and 13CO(1-0) data from the Three-mm Ultimate Mopra Milky way Survey and archival data. We separate the emission in the Galactic Plane around l = 330°-335° and b = -…
A Spectroscopic and Photometric Exploration of the C/M Ratio in the Disk of M31
Williams, Benjamin F.; Gilbert, Karoline M.; Boyer, Martha L. +12 more
We explore the ratio (C/M) of carbon-rich to oxygen-rich thermally pulsing asymptotic giant branch (TP-AGB) stars in the disk of M31 using a combination of moderate-resolution optical spectroscopy from the Spectroscopic Landscape of Andromeda’s Stellar Halo survey and six-filter Hubble Space Telescope photometry from the Panchromatic Hubble Androm…