THE FIFTH DATA RELEASE SLOAN DIGITAL SKY SURVEY/ XMM-NEWTON QUASAR SURVEY
نویسندگان
چکیده
منابع مشابه
quasars in the Sloan Digital Sky Survey Early Data Release
We have compiled a sample of 21 low redshift (z . 0.3), luminous active galactic nuclei (AGN) with large Balmer decrements (Hα/Hβ > 7) using the galaxy and QSO catalogs of the Sloan Digital Sky Survey Early Data Release. Using this sample we attempt to determine the fraction of quasars with large internal absorption. We find that these AGN have Strong [O III] λ5007 and broad Hα emission, and th...
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The Sloan Digital Sky Survey is an ambitious, multi-institutional project to create a huge digital imaging and spectroscopic data bank of 25% of the celestial sphere, approximately 10,000 deg2 centred on the north galactic polar cap. The photometric atlas will be in 5 specially-chosen colours, covering the π ster of the Survey area to a limiting magnitude of r′∼23.1, on 0′′ . 4 pixels, resultin...
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The XMM Cluster Survey (XCS) is predicted to detect thousands of clusters observed serendipitously in XMM-Newton pointings. We investigate automating optical follow-up of XCS cluster candidates using the Sloan Digital Sky Survey (SDSS) public archive, concentrating on 42 XMM observations that overlap the First Data Release of the SDSS. Confining ourselves to the inner 11 arcminutes of the XMM f...
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We compare quantitative estimates of the filamentarity of the galaxy distribution in seven nearly two dimensional sections from the survey against the predictions of ΛCDM N-body simulations. The filamentarity of the actual galaxy distribution is known to be luminosity dependent. It is also known that the filamentarity of the simulated galaxy distribution is highly sensitive to the bias, and the...
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ژورنال
عنوان ژورنال: The Astrophysical Journal Supplement Series
سال: 2009
ISSN: 0067-0049,1538-4365
DOI: 10.1088/0067-0049/183/1/17