Questions tagged [sloan-dss]
The sloan-dss tag has no usage guidance.
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How to place an observer in a cosmological simulation
Suppose I have a cosmological simulation with points in xyz space at a certain redshift in a cube like this:
And I have these for many cubes of different redshifts say from z=0 to z=2. Now I want to ...
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Getting XYZ coordinates of Luminous Red Galaxies catalogue
So I want to get the XYZ (rectangular/Cartesian) coordinates of the LRG (luminous red galaxies) catalog. The catalog is available for download from here: https://data.sdss.org/sas/dr16/eboss/lss/...
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Sloan Digital Sky Survey - Obtaining Spectral and Photometric Datasets
I am working on a soft computing (fuzzy logic), genetic algorithm, explainable AI (XAI) classification system for astronomical objects from the Sloan Digital Sky Survey. The dataset I am currently ...
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What are mag_a, mag_i, mag_z, a*, and sin_i * from the SDSS Moving Objects Data?
I'm currently working on the SDSS Moving Objects data sets and came across the column names mag_a, mag_i, mag_z, aprime, and sin_iprime. Can someone describe what these attributes mean, or where I can ...
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Q: Calculating the luminosity of a galaxy
I am currently working on a project on which I am calculating the luminosity of galaxies by using the SDSS data. They use a system of asinh magnitudes, and according to their website they use a system ...
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Error associated with Sersic Profile calculations?
I am working on a Bayesian analysis project for class using data I gathered some data from NASA's Sloan Atlas (http://www.nsatlas.org/). One of the variables I am dealing with is the Sérsic Index (...
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Sloan Digital Sky Survey (SDSS) HDU `or_mask` - what does it mean exactly?
I'm looking at the Sloan Digital Sky Survey data. I'm primarily using the flux data, from the documentation I see the first extend (HDU 1) has flux, ...
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Trying to use SQL to query SDSS
I'm trying to use the SQL search at https://skyserver.sdss.org/dr18/SearchTools/sql to find (for example) QSOs with accurate redshifts from the SDSS. My query will look something like this:
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