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A Deep Search for Prompt Radio Emission from Thermonuclear Supernovae with the Very Large Array
Laura Chomiuk, Alicia M. Soderberg, Roger A. Chevalier +10
Searches for circumstellar material around Type Ia supernovae (SNe Ia) are one of the most powerful tests of the nature of SN Ia progenitors, and radio observations provide a parti…
Optical spectroscopy of the high-mass gamma-ray binary 1FGL J1018.6-5856: A probable neutron star primary
Jay Strader, Laura Chomiuk, C. C. Cheung +2
We present medium-resolution optical spectroscopy with the SOAR telescope of the O star secondary of the high-mass gamma-ray binary 1FGL J1018.6-5856 to help determine whether the…
Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate
J. C. A. Miller-Jones, J. Strader, C. O. Heinke +8
We report the detection of steady radio emission from the known X-ray source X9 in the globular cluster 47 Tuc. With a double-peaked C IV emission line in its ultraviolet spectrum…
Limits on thermal variations in a dozen quiescent neutron stars over a decade
Arash Bahramian, Craig O. Heinke, Nathalie Degenaar +5
In quiescent low-mass X-ray binaries (qLMXBs) containing neutron stars, the origin of the thermal X-ray component may be either release of heat from the core of the neutron star, o…
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (II): properties of point sources
Dacheng Lin, Jimmy A. Irwin, Ka-wah Wong +7
We have carried out an in-depth study of low-mass X-ray binaries (LMXBs) detected in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Project obs…
The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (III): luminosity functions of LMXBs and dependence on stellar environments
Dacheng Lin, Jimmy A. Irwin, Ka-wah Wong +7
We have studied the X-ray luminosity function (XLF) of low-mass X-ray binaries (LMXBs) in the nearby lenticular galaxy NGC 3115, using the Megasecond Chandra X-Ray Visionary Projec…
Optical spectroscopic observations of gamma-ray blazar candidates III. The 2013/2014 campaign in the Southern Hemisphere
M. Landoni, F. Massaro, A. Paggi +8
We report the results of our exploratory program carried out with the Southern Astrophysical Research (SOAR) telescope aimed at associating counterparts and establishing the nature…
1FGL J1417.7-4407: A likely gamma-ray bright binary with a massive neutron star and a giant secondary
Jay Strader, Laura Chomiuk, C. C. Cheung +12
We present multiwavelength observations of the persistent Fermi-LAT unidentified gamma-ray source 1FGL J1417.7-4407, showing it is likely to be associated with a newly discovered X…