SDSS makes heavy use of the concept of a bitmask in spectroscopic target flags and other contexts. For the actual bit values for all SDSS flags, see the lists below. More detailed descriptions of the targeting bitmasks for the completed optical surveys and infrared surveys can be found in the DR17 release documentation. The page […]
Search Results for: SDSS-IV
DR18 BOSS Pipeline
The SDSS Early Data Release (EDR) paper is the original resource for understanding the processing and data products from the SDSS, describing the pipelines and spectroscopic data products. Successive data release papers: DR1, DR2, DR3, DR4, DR5, DR6, DR7, DR8, DR9, DR10, DR11, DR12, DR13, DR14, DR15, DR16, and DR17 describe changes to the optical spectroscopic data reduction between data releases. The technical summary paper provides more general information on the SDSS-I survey, the SDSS-III summary […]
DR18 Software Pipelines
Data Reduction Pipelines SDSS spectra are generated by running raw data from the SDSS Observatories in the North and South through a series of data reductions, orchestrated by SDSS Pipelines. The following table lists each SDSS Data Reduction Pipeline (DRP), indicating whether it is current in SDSS-V or completed in a previous phase of SDSS: […]
DR18 BHM Science Programs
Summary of BHM Time-Domain Spectral Programs The BHM optical (BOSS) repeat spectral time-domain programs emphasize the astrophysics of quasars, including studies of BH masses, binarity, accretion and events, broad line region (BLR) dynamics, outflows, etc., requiring spectral sampling at a broad range of timescales/cadence, ranging from days to decades; this is achieved via several tiers. […]
DR18 BHM SPIDERS
‘SPectroscopic IDentfication of ERosita Sources’ Summary The SDSS-V SPIDERS project aims to characterize a large sample of X-ray sources through an ambitious program of optical spectroscopic follow up. The SPIDERS project has two main science themes – the follow up of X-ray point-like sources (‘SPIDERS-AGN’), and the follow up of X-ray/optical cluster candidates ( ‘SPIDERS-Clusters’). […]
DR18 BHM Reverberation Mapping
Summary The SDSS-V/BHM Reverberation Mapping (RM) project seeks to measure the time lag of broad emission line response to continuum variability, and hence virial BH mass estimates, aiming for a large and uniformly selected sample of quasars across a wide range of luminosities and redshifts. The target sample is overall a flux-limited one without other […]
DR18 Tutorials Overview
Welcome to the SDSS tutorial section. This section contains a series of hands-on tutorials to learn how to work with different aspects of the SDSS data. If you are unsure what kind of SDSS data or which SDSS survey is best for your science, then go the the mapper overview page: this page contains short […]
Data Volume for DR18
SDSS Science Archive Server (SAS) The SAS is a hierarchical directory structure with named data products, and can be navigated directly: Individual data products are either replacements from previous data releases, and add incrementally to the data volume, or contain links to previous data releases, and add cumulatively to the data volume. Whether you are […]
Faculty and Student Team (FAST) Initiative
Since 2015, the Sloan Foundation has funded a Faculty And Student Team (FAST) initiative. In June 2018, the Foundation renewed this grant for a second three-year cycle to allow us to continue this program. The FAST program deliberately targets faculty and their students at US institutions with strong track records of serving underrepresented minority students. […]
DR18 Bulk Data Downloads
All data can be downloaded directly from data.sdss.org and dr18.sdss.org using the rsync or wget commands. Access is also available via Globus Online. The Data Model page has a description of the directory structure and file formats. Note that the total SDSS data volume is > 650 TB; see the data volume table including all data releases. If you need a substantial fraction of […]