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SDSS Galaxy Subset

Authors: Carvalho, Nuno Ramos;

SDSS Galaxy Subset

Abstract

The Sloan Digital Sky Survey (SDSS) is a comprehensive survey of the northern sky. This dataset contains a subset of this survey, of 100077 objects classified as galaxies, it includes a CSV file with a collection of information and a set of files for each object, namely JPG image files, FITS and spectra data. This dataset is used to train and explore the astromlp-models collection of deep learning models for galaxies characterisation. The dataset includes a CSV data file where each row is an object from the SDSS database, and with the following columns (note that some data may not be available for all objects): objid: unique SDSS object identifier mjd: MJD of observation plate: plate identifier tile: tile identifier fiberid: fiber identifier run: run number rerun: rerun number camcol: camera column field: field number ra: right ascension dec: declination class: spectroscopic class (only objetcs with GALAXY are included) subclass: spectroscopic subclass modelMag_u: better of DeV/Exp magnitude fit for band u modelMag_g: better of DeV/Exp magnitude fit for band g modelMag_r: better of DeV/Exp magnitude fit for band r modelMag_i: better of DeV/Exp magnitude fit for band i modelMag_z: better of DeV/Exp magnitude fit for band z redshift: final redshift from SDSS data z stellarmass: stellar mass extracted from the eBOSS Firefly catalog w1mag: WISE W1 "standard" aperture magnitude w2mag: WISE W2 "standard" aperture magnitude w3mag: WISE W3 "standard" aperture magnitude w4mag: WISE W4 "standard" aperture magnitude gz2c_f: Galaxy Zoo 2 classification from Willett et al 2013 gz2c_s: simplified version of Galaxy Zoo 2 classification (labels set) Besides the CSV file a set of directories are included in the dataset, in each directory you'll find a list of files named after the objid column from the CSV file, with the corresponding data, the following directories tree is available: sdss-gs/ ├── data.csv ├── fits ├── img ├── spectra └── ssel Where, each directory contains: img: RGB images from the object in JPEG format, 150x150 pixels, generated using the SkyServer DR16 API fits: FITS data subsets around the object across the u, g, r, i, z bands; cut is done using the ImageCutter library spectra: full best fit spectra data from SDSS between 4000 and 9000 wavelengths ssel: best fit spectra data from SDSS for specific selected intervals of wavelengths discussed by Sánchez Almeida 2010 Changelog v0.0.4 - Increase number of objects to ~100k. v0.0.3 - Increase number of objects to ~80k. v0.0.2 - Increase number of objects to ~60k. v0.0.1 - Initial import.

Keywords

sdss

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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  • 155
    views
    53
    downloads
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visibility
download
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
OpenAIRE UsageCountsDownloads provided by UsageCounts
0
Average
Average
Average
155
53