THE BOSS Lyα FOREST SAMPLE FROM SDSS DATA RELEASE 9
نویسندگان
چکیده
منابع مشابه
Intrinsic alignments of SDSS-III BOSS LOWZ sample galaxies
Intrinsic alignments (IA) of galaxies, i.e. correlations of galaxy shapes with each other (II) or with the density field (gI), are potentially a major astrophysical source of contamination for weak lensing surveys. We present the results of IA measurements of galaxies on 0.1–200hMpc scales using the SDSS-III BOSS LOWZ sample, in the redshift range 0.16 < z < 0.36. We extend the existing IA meas...
متن کاملThe probability distribution of the Lyα transmitted flux from a sample of SDSS quasars
We present a measurement of the probability distribution function (PDF) of the transmitted flux in the Lyα forest from a sample of 3492 quasars included in the SDSS DR3 data release. Our intention is to investigate the sensitivity of the Lyα flux PDF as measured from low resolution and low signal-to-noise data to a number of systematic errors such as uncertainties in the mean flux, continuum an...
متن کاملNarrow-line Seyfert 1s from the SDSS Early Data Release
We present a sample of 150 narrow-line Seyfert 1s (NLS1s) found within the Sloan Digital Sky Survey Early Data Release (EDR), only one of which was previously identified as such. This more than triples the known number of NLS1s, and provides a basic method by which to identify many more with subsequent releases of SDSS data. With its large size and homogeneous, well-defined selection criteria, ...
متن کاملThe Sdss Damped Lyα Survey: Data Release 1 the Quasar Sample Was Drawn from Data Release 1 of the Sloan Digital Sky Survey to a Limiting Pertosian Mag- 1
We present the results from an automated search for damped Lyα (DLA) systems in the quasar spectra of Data Release 1 from the Sloan Digital Sky Survey (SDSS-DR1). At z ≈ 2.5, this homogeneous dataset exceeds the statistical significance of the previous two decades of research. We derive a statistical sample of 71 damped Lyα systems (> 50 previously unpublished) at z > 2.1 and measure H I column...
متن کاملLyα ABSORBER CORRELATIONS AND THE “BIAS” OF THE Lyα FOREST
Lyα absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunity to independently measure the “bias” of the Lyman alpha forest, i.e. the relationship between H I column density and underlying dark matter density. In these proceedings we use hydrodynamic simulations to investigate whether...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2013
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/145/3/69