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26 April 2024 |
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Article overview
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Constraining the lifetime and opening angle of quasars using fluorescent Ly a emission: the case of Q0420-388 | | Elena Borisova
; Simon J. Lilly
; Sebastiano Cantalupo
; J. Xavier Prochaska
; Olivera Rakic
; Gabor Worseck
; | | Date: |
30 Sep 2015 | | Abstract: | A toy model is developed to understand how the spatial distribution of
fluorescent emitters in the vicinity of bright quasars could be affected by the
geometry of the quasar bi-conical radiation field and by the quasar lifetime.
We then compare the predictions of this model to a sample of high equivalent
width Ly a emitters (EW0 > 100 A) that were identified in a deep narrow-band
36x36 arcmin2 image centered on the luminous quasar Q0420-388. These are
identified to the edge of the field and show some evidence of an azimuthal
asymmetry on the sky of the type expected if the quasar is radiating in a
bipolar cone. If these sources are being fluorescently illuminated by the
quasar, then the two most distant sources require a lifetime of at least 15 Myr
for an opening angle of 60 degrees or more, increasing to more than 40 Myr if
the opening angle is reduced to a minimum 30 degrees. The overall distribution
of all of the sources across the field gives best fit lifetimes in the range 20
< t < 50 Myr for opening angles in the range 90 < alpha < 40 degrees. If these
sources are not being fluorescently illuminated by the quasar, then it suggests
that a higher equivalent width limit than has been used in the literature to
identify fluorescent objects will be required. | | Source: | arXiv, 1510.0029 | | Services: | Forum | Review | PDF | Favorites | |
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