Search Publications
High-resolution Radio Observations of the Remnant of SN 1987A at High Frequencies
Gaensler, B. M.; Manchester, R. N.; Ng, C. -Y. +4 more
We present new imaging observations of the remnant of Supernova (SN) 1987A at 44 GHz, performed in 2011 with the Australia Telescope Compact Array (ATCA). The 0.''35 × 0.''23 resolution of the diffraction-limited image is the highest achieved to date in high-dynamic range. We also present a new ATCA image at 18 GHz derived from 2011 observations, …
The Role of Merger Stage on Galaxy Radio Spectra in Local Infrared-bright Starburst Galaxies
Murphy, Eric J.
An investigation of the steep, high-frequency (i.e., ν ~ 12 GHz) radio spectra among a sample of 31 local infrared-bright starburst galaxies is carried out in light of their Hubble-Space-Telescope-based merger classifications. Radio data covering as many as 10 individual bands allow for spectral indices to be measured over three frequency bins bet…
Precision Measurement of The Most Distant Spectroscopically Confirmed Supernova Ia with the Hubble Space Telescope
Huang, X.; Wang, L.; Lidman, C. +26 more
We report the discovery of a redshift 1.71 supernova in the GOODS-North field. The Hubble Space Telescope (HST) ACS spectrum has almost negligible contamination from the host or neighboring galaxies. Although the rest-frame-sampled range is too blue to include any Si II line, a principal component analysis allows us to confirm it as a Type Ia supe…
PSR J0357+3205: The Tail of the Turtle
Belfiore, A.; Marelli, M.; Saz Parkinson, P. M. +6 more
Using a new XMM-Newton observation, we have characterized the X-ray properties of the middle-aged radio-quiet γ-ray pulsar J0357+3205 (named Morla) and its tail. The X-ray emission from the pulsar is consistent with a magnetospheric non-thermal origin plus a thermal emission from a hot spot (or hot spots). The lack of a thermal component from the …
Calculating Time Lags from Unevenly Sampled Light Curves
Cackett, E. M.; Zoghbi, A.; Reynolds, C.
Timing techniques are powerful tools to study dynamical astrophysical phenomena. In the X-ray band, they offer the potential of probing accretion physics down to the event horizon. Recent work has used frequency- and energy-dependent time lags as tools for studying relativistic reverberation around the black holes in several Seyfert galaxies. This…
X-Ray Observations of High-B Radio Pulsars
McLaughlin, M. A.; Lyne, A. G.; Manchester, R. N. +6 more
The study of high-magnetic-field pulsars is important for examining the relationships between radio pulsars, magnetars, and X-ray-isolated neutron stars (XINSs). Here, we report on X-ray observations of three such high-magnetic-field radio pulsars. We first present the results of a deep XMM-Newton observation of PSR J1734-3333, taken to follow up …
The Detection of C60 in the Well-characterized Planetary Nebula M1-11
Meixner, M.; Otsuka, Masaaki; Yanagisawa, K. +4 more
We performed multiwavelength observations of the young planetary nebula (PN) M1-11 and obtained its elemental abundances, dust mass, and the evolutionary status of the central star. The AKARI/IRC, VLT/VISIR, and Spitzer/IRS spectra show features due to carbon-rich dust, such as the 3.3, 8.6, and 11.3 µm features due to polycyclic aromatic hy…
Discovery of TeV Gamma-Ray Emission from CTA 1 by VERITAS
Nelson, T.; Reyes, L. C.; Aune, T. +88 more
We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by a two-dimensional Gaussian of semimajor (semiminor…
Mass/radius Constraints on the Quiescent Neutron Star in M13 Using Hydrogen and Helium Atmospheres
Heinke, C. O.; Sivakoff, G. R.; Servillat, M. +2 more
The mass and radius of the neutron star (NS) in low-mass X-ray binaries can be obtained by fitting the X-ray spectrum of the NS in quiescence, and the mass and radius constrains the properties of dense matter in NS cores. A critical ingredient for spectral fits is the composition of the NS atmosphere: hydrogen atmospheres are assumed in most prior…
Gaseous CO Abundance—An Evolutionary Tracer for Molecular Clouds
Liu, Tie; Wu, Yuefang; Zhang, Huawei
Planck cold clumps are among the most promising objects to investigate the initial conditions of the evolution of molecular clouds. In this work, by combing the dust emission data from the survey of the Planck satellite with the molecular data of 12CO/13CO/C18O (1-0) lines from observations with the Purple Mountain…