239.03 - Extreme-UV Analysis of SDSS J1042+1646 from HST/COS Observations: Distance, Energetics, and Hints of an Accelerating Outflow

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Jan 8th at 2:30 PM until 2:40 PM




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Author(s): X. Xu, N. Arav, T.R. Miller, Physics, Virginia Tech, Blacksburg, Virginia, UNITED STATES|
Institution(s): 1. Physics, Virginia Tech, Blacksburg, VA, United States.
Contributing team(s): (none)
We determine the physical conditions and locations of outflows seen in quasar SDSS J1042+1646. These results are based on the analysis of our recent HST/COS observations. These data cover diagnostic-rich extreme UV range of 500 - 1050A rest-frame. We have identified at least three significant outflow systems at velocities: -5300 km s-1, -7600 km s-1 and -20000km s-1. We also detected absorption troughs from both high-ionization species (ArVII, ArVIII, NeVIII, NaIX and MgX), and low-ionizaton species (NIV, OIV, OV, SV, SVI, CaVI and CaVII). Combined with troughs from excited states of OIV or OV, we are able to determine the electron number density, distance, mass flux and energetics of these outflows. Moreover, the outflow component of v ~-20000 km s-1 shows a velocity shift of -1500 km s-1 over 6 years (2011 to 2017), which hints of an accelerating outflow.

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