srodney added x-ray text in main Results section  over 7 years ago

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a more complete description of the operations of the FrontierSN  program, see \citet{Rodney:2015a}.  \subsection{X-ray Non-detections} Non-detections}\label{Xray}  The MACS0416 field was observed by the SWIFT X-Ray Telescope (XRT) and  UltraViolet/Optical Telescope (UVOT) in April 2013. No source was 

Jones) on June 9, August 31, November 26, and December 17, 2014. These  Chandra images show no evidence for an x-ray emitting point source  near the \spock locations on those dates (S. Murray, private  communication).The Chandra imaging collected on August 31, 2014  (MJD=56900) was coeval with the observed peak of IR emission from  the SE transient, \spocktwo, captured with HST. None of the other  X-ray imaging epochs coincided with \spock detections in optical or IR  wavelengths.  \subsection{Photometry}\label{sec:Photometry}         

Mira variables) that exhibit regular changes in flux due to pulsations  of the stellar photosphere. These variable stars do not exhibit sharp,  isolated transient episodes that could match the \spock light curve  shapes. Stellar flares provide another very common source for optical  transient events, but the total energy released by even the most  extreme stellar flare falls far short of the observed energy release  from the \spock transients \citep{Balona:2012,Karoff:2016} .  We can also rule out active galactic nuclei (AGN), in which brief transient episodes (a few days in duration) may be observed from  X-ray to infrared wavelengths \citep[e.g.][]{Gaskell:2003},  principally due to the quiescence of the \spock sources between the  two observed episodes and the absence of any of the broad emission  lines that are often (though not always) observed in AGN. Stellar  flares provide another very common No x-ray  emitting point  source for optical transient  events, but the total energy released by even the most extreme stellar  flare falls far short was detected in 7 epochs  of imaging from  the observed energy release Swift and Chandra x-ray space telescopes, collected  from 2009 to  2014 (Methods~\ref{sec:Xray}). This includes  the \spock  transients \citep{Balona:2012,Karoff:2016} . Chandra imaging on  August 31, 2014 (MJD=56900), which was coeval with the peak  of IR emission from \spocktwo, observed with HST.  Many types of stellar explosions can generate isolated  transient events, and a useful starting point for classification of