Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-06
Astronomy and Astrophysics
Astrophysics
ApJ, in press, Vol 548, added follow-up spectroscopy
Scientific paper
10.1086/316575
We study the large-scale spatial distribution of low-redshift quasars and Seyfert~1 galaxies using a sample of 106 luminous emission-line objects ($\bar{M}_{B} \approx -23$) selected by their H$\alpha$ emission lines in a far-red objective prism survey ($0.2 < z < 0.37$). Of the 106 objects, 25 were previously known AGN (Veron-Cetty and Veron 2000), and follow-up spectroscopy for an additional 53 objects (including all object pairs with separation $r < 20 \hmpc$) confirmed 48 AGN and 5 narrow emission-line galaxies (NELGs). The calculated amplitude of the spatial two-point correlation function for the emission-line sample is $A = 0.4 \cdot \bar{\xi}(r < 20 \hmpc) \cdot 20^{1.8} = 142 \pm 53$. Eliminating the confirmed NELGs from the sample we obtain the AGN clustering amplitude $A = 98 \pm 54$. Using Monte Carlo simulations we reject the hypothesis that the observed pair counts were drawn from a random distribution at the 99.97% and 98.6% confidence levels for the entire sample and the AGN subset respectively. We measure a decrease in the quasar clustering amplitude by a factor of $3.7 \pm 2.0$ between $z = 0.26$ and $z \approx 1.5$, and present the coordinates, redshifts, and follow-up spectroscopy for the 15 previously unknown AGN and 4 luminous NELGs that contribute to the clustering signal.
Baltay Charles
Bongiovanni Angel
Bruzual Gustavo
Coppi Paolo
Garcia C. E.
No associations
LandOfFree
The Low-Redshift Quasar-Quasar Correlation Function from an Extragalactic Halpha Emission-Line Survey to z=0.4 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 The Low-Redshift Quasar-Quasar Correlation Function from an Extragalactic Halpha Emission-Line Survey to z=0.4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Low-Redshift Quasar-Quasar Correlation Function from an Extragalactic Halpha Emission-Line Survey to z=0.4 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-573530