A collimated flow driven by radiative pressure from the nucleus of quasar Q~1511+091

High velocity outflows from quasars are revealed by the absorption signatures they produce in the spectrum of the quasar. Clues on the nature and origin of these flows are important for our understanding of the dynamics of gas in the central regions of the Active Galactic Nucleus (AGNs) but also of the metal enrichment of the intergalactic space. Line radiation pressure has often been suggested to be an important process in driving these outflows, however no convincing evidence has been given so far. Here we report observation of a highly structured flow, toward Q~1511+091, where the velocity separations between distinct components are similar to O VI, N V and C IV doublet splittings with some of the profiles matching perfectly. This strongly favors the idea that the absorbing clumps originate at similar physical location and are driven by radiative acceleration due to resonance lines. The complex absorption can be understood if the flow is highly collimated so that the different optically thick clouds are aligned and cover the same region of the background source. One component shows saturated H I Lyman series lines together with absorptions from excited levels from C II and Si II but covers only 40% of the source of continuum. The fact that clouds cover only part of the small continuum source implies that the flow is located very close to it.Comment: 6 pages, 5 figures to appear in MNRA

School Attendance of High School Dropouts

The purpose of this study was to determine if there is an identifiable pattern of absences for elementary school student who eventually drop out of high school. If so, attendance patterns could be used as an indicator for students at risk or dropping out. Using attendance data, the study investigated these absences. This study examined the elementary attendance records of 42 high school dropouts. All of these students attended school in the Fulton City School District. The study began by looking at grade levels. For each grade level, the percentage of each day of the week missed was calculated. The purpose of this was to determine if there was one particular day of the week, at each grade level, that was most likely to be missed. The next step was to determine if there was a particular day that was most commonly missed overall. The results of this analysis indicated that there is no one day that is more likely to be missed. In addition, a percentage of absences for each grade level was calculated. The purpose was to determine if there is an increase in the number of absences with increase in grade level. Results of the study did not support this idea. Finally, two students were examined more closely to determine if there was a pattern to their absences over three or more years. This analysis also failed to find any pattern that would be useful in identifying potential dropouts. While poor attendance is known to be an indicator of students at risk of dropping out, the specifics of particular days missed does not seem to be useful in identifying these students