Search Publications
Pre-explosion Companion Stars in Type Iax Supernovae
Wang, B.; Liu, Zheng-Wei; Stancliffe, Richard J. +1 more
Type Iax supernovae (SNe Iax) are proposed as one new sub-class of SNe Ia since they present observational properties that are sufficiently distinct from the bulk of SNe Ia. SNe Iax are the most common of all types of peculiar SNe by both number and rate, with an estimated rate of occurrence of about 5%-30% of the total SN Ia rate. However, the pr…
Dark Matter Line Emission Constraints from NuSTAR Observations of the Bullet Cluster
Harrison, F. A.; Hornstrup, A.; Stern, D. +10 more
Some dark matter candidates, e.g., sterile neutrinos, provide observable signatures in the form of mono-energetic line emission. We present the first search for dark matter line emission in the 3-80 {keV} range in a pointed observation of the Bullet Cluster with NuSTAR. We do not detect any significant line emission and instead we derive upper lim…
The Entire Virial Radius of the Fossil Cluster RX J1159+5531: I. Gas Properties
Brighenti, Fabrizio; Gastaldello, Fabio; Su, Yuanyuan +1 more
Previous analysis of the fossil-group/cluster RX J1159+5531 with X-ray observations from a central Chandra pointing and an offset-north Suzaku pointing indicate a radial intracluster medium (ICM) entropy profile at the virial radius (Rvir) consistent with predictions from gravity-only cosmological simulations, in contrast to other cool-…
The Massive and Distant Clusters of WISE Survey: MOO J1142+1527, a 1015 M⊙ Galaxy Cluster at z = 1.19
Eisenhardt, Peter R. M.; Gonzalez, Anthony H.; Marrone, Daniel P. +19 more
We present confirmation of the cluster MOO J1142+1527, a massive galaxy cluster discovered as part of the Massive and Distant Clusters of WISE Survey. The cluster is confirmed to lie at z = 1.19, and using the Combined Array for Research in Millimeter-wave Astronomy we robustly detect the Sunyaev-Zel’dovich (SZ) decrement at 13.2σ. The SZ data imp…
Galaxy Evolution in the Mid-infrared Green Valley: A Case of the A2199 Supercluster
Diaferio, Antonaldo; Lee, Myung Gyoon; Hwang, Ho Seong +4 more
We study the mid-infrared (MIR) properties of the galaxies in the A2199 supercluster at z = 0.03 to understand the star formation activity of galaxy groups and clusters in the supercluster environment. Using the Wide-field Infrared Survey Explorer data, we find no dependence of mass-normalized integrated star formation rates of galaxy groups/clust…
Optical Identification of He White Dwarfs Orbiting Four Millisecond Pulsars in the Globular Cluster 47 Tucanae
Dalessandro, E.; Salaris, M.; Ferraro, F. R. +4 more
We used ultra-deep UV observations obtained with the Hubble Space Telescope to search for optical companions to binary millisecond pulsars (MSPs) in the globular cluster 47 Tucanae. We identified four new counterparts (to MSPs 47TucQ, 47TucS, 47TucT, and 47TucY) and confirmed those already known (to MSPs 47TucU and 47TucW). In the color-magnitude …
First High-resolution Spectroscopic Observations of an Erupting Prominence Within a Coronal Mass Ejection by the Interface Region Imaging Spectrograph (IRIS)
Liu, Wei; Antolin, Patrick; De Pontieu, Bart +6 more
Spectroscopic observations of prominence eruptions associated with coronal mass ejections (CMEs), although relatively rare, can provide valuable plasma and three-dimensional geometry diagnostics. We report the first observations by the Interface Region Imaging Spectrograph mission of a spectacular fast CME/prominence eruption associated with an eq…
Comparing Planck and WMAP: Maps, Spectra, and Parameters
Larson, D.; Weiland, J. L.; Hinshaw, G. +1 more
We examine the consistency of the 9 yr WMAP data and the first-release Planck data. We specifically compare sky maps, power spectra, and the inferred Λ cold dark matter (ΛCDM) cosmological parameters. Residual dipoles are seen in the WMAP and Planck sky map differences, but their amplitudes are consistent within the quoted uncertainties, and they …
Solar Cycle Variation of the Inter-network Magnetic Field
Wang, Jingxiu; Jin, Chunlan
The solar inter-network magnetic field is the weakest component of solar magnetism, but it contributes most of the solar surface magnetic flux. The study of its origin has been constrained by the inadequate tempospatial resolution and sensitivity of polarization observations. With dramatic advances in spatial resolution and detecting sensitivity, …
Exploring the Dust Content of Galactic Winds with Herschel. I. NGC 4631
Veilleux, S.; Müller, T.; Martin, C. +8 more
We present a detailed analysis of deep far-infrared observations of the nearby edge-on star-forming galaxy NGC 4631 obtained with the Herschel Space Observatory. Our Photodetector Array Camera and Spectrometer (PACS) images at 70 and 160 µm show a rich complex of filaments and chimney-like features that extends up to a projected distance of …