Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-03-14
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Submitted to MNRAS letter, comments are welcome (5 pages, 4 figures, 1 table)
Scientific paper
We present a detailed analysis of a highly ionized, multiphased and collimated outflowing gas detected through O V, O VI, Ne VIII and Mg X absorption associated with the QSO HE 0238 - 1904 (z_em ~ 0.629). Based on the similarities in the absorption line profiles and estimated covering fractions, we find that the O VI and Ne VIII absorption trace the same phase of the absorbing gas. Simple photoionization models can reproduce the observed N(Ne VIII), N(O VI) and N(Mg X) from a single phase whereas the low ionization species (e.g. N III, N IV, O IV) originate from a different phase. The measured N(Ne VIII)/N(O VI) ratio is found to be remarkably similar (within a factor of ~ 2) in several individual absorption components kinematically spread over ~ 1800 km/s. Under photoionization this requires a fine tuning between hydrogen density (nH) and the distance of the absorbing gas from the QSO. Alternatively this can also be explained by collisional ionization in hot gas with T > 10^{5.7} K. Long-term stability favors the absorbing gas being located outside the broad line region (BLR). We speculate that the collimated flow of such a hot gas could possibly be triggered by the radio jet interaction.
Dewangan Gulab C.
Mohan Vijay
Muzahid Sowgat
Narayanan Anand
Savage Blair. D.
No associations
LandOfFree
Highly Ionized Collimated Outflow from HE 0238 - 1904 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Highly Ionized Collimated Outflow from HE 0238 - 1904, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Highly Ionized Collimated Outflow from HE 0238 - 1904 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-715579