Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-11-03
Astronomy and Astrophysics
Astrophysics
Accepted for Publication in MNRAS. Paper with 11 figures
Scientific paper
10.1046/j.1365-8711.1998.01317.x
We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by $\sim~3\,$years, shows evidence for significant changes in the emission line to continuum ratio of the strong ultraviolet CIV~$\lambda$1549, CIII]~$\lambda$1909 and MgII~$\lambda$2798 lines. The short, $\sim~1\,$day, light--travel time differences between the sight lines to the four individual quasar images rule out any explanation based on intrinsic variability of the source. The spectroscopic differences thus represent direct detection of microlensing--induced spectroscopic differences in a quasar. The observations allow constraints to be placed on the relative spatial scales in the nucleus of the quasar, with the ultra--violet continuum arising in a region of $\la~0.05~{\rm pc}$ in extent, while the broad emission line material is distributed on scales much greater than this.
Foltz Craig B.
Hewett Paul C.
Irwin Mary Jane
Lewis Geraint F.
No associations
LandOfFree
Microlensing induced spectral variability in Q2237+0305 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 Microlensing induced spectral variability in Q2237+0305, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microlensing induced spectral variability in Q2237+0305 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-574036