Information on Service 'A Manually Cleaned List of Nearby Galaxies from SDSS DR9'

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We present a sample of 317,018 galaxies at the redshifts 0.003 < z < 0.1 from SDSS DR9. We arrived at the current selection by limiting z as computed by SDSS, filtering out non-galaxy objects, and finally checking for faulty and duplicate objects. This yielded 724,000 objects. Further cleaning steps included removal of quasars and star-like objects, removal of duplicate images using the SDSS DR9 Image List Tool as well as proprietary code. By visual inspection, we selected the best image of each galaxy, which led to a sample of about 360,000 galaxies. Using the SDSS recommendation to avoid typical statistical errors near the spectroscopic flux limit we restricted the sample by stellar magnitude in r-band (modelMag_r < 17.7).

For a list of all services and tables belonging to this service's resource, see Information on resource 'A Manually Cleaned List of Nearby Galaxies from SDSS DR9'

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Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
abs_mr M_r Absolute stellar magnitude in the SDSS r band, calculated as Mr = modelMag_r - 5*log10(DL) - 25 - Extinction_r - kcorrect_r, where modelMag_r - the model magnitudes in a r-band; DL - luminosity distance; Extinction_r - Galactic extinction in r-band; kcorrect_r - k- correction in r-band. mag phys.magabs
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
dl Lum. Dist. Luminosity distance. This was calculated it with the LUMDIST program. Mpc pos.distance
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
maxrec Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
morph Morph. Morphological type, E, S, or I N/A src.morph.type
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
responseformat Output Format File format requested for output. N/A meta.code.mime
SR Search Radius Search radius deg N/A
verb Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A
z z Redshift taken from SDSS N/A src.redshift

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.angDistance
abs_mr M_r Absolute stellar magnitude in the SDSS r band, calculated as Mr = modelMag_r - 5*log10(DL) - 25 - Extinction_r - kcorrect_r, where modelMag_r - the model magnitudes in a r-band; DL - luminosity distance; Extinction_r - Galactic extinction in r-band; kcorrect_r - k- correction in r-band. mag phys.magabs
dec Dec ICRS declination for this object from SDSS N/A pos.eq.dec;meta.main
dl Lum. Dist. Luminosity distance. This was calculated it with the LUMDIST program. Note ld Mpc pos.distance
id Id Main identifier for this object; this is the objID column from SDSS DR9's photoTag table N/A meta.id;meta.main
modelmag_g m_g Model magnitude in the g band from SDSS DR9 mag phot.mag;em.opt.V
modelmag_i m_i Model magnitude in the i band from SDSS DR9 mag phot.mag;em.opt.I
modelmag_r m_r Model magnitude in the r band from SDSS DR9 mag phot.mag;em.opt.R
modelmag_u m_u Model magnitude in the u band from SDSS DR9 mag phot.mag;em.opt.U
modelmag_z m_z Model magnitude in the z band from SDSS DR9 mag phot.mag;em.opt.I
morph Morph. Morphological type, E, S, or I Note m N/A src.morph.type
petror50_r R_50 Radius containing 50% of the Petrosian flux in the r-band. arcsec phys.angsize;src
petror90_r R_90 Radius containing 90% of the Petrosian flux in the r-band. arcsec phys.angsize;src
ra Ra ICRS right ascension for this object from SDSS N/A pos.eq.ra;meta.main
z z Redshift taken from SDSS N/A src.redshift

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
id Id Main identifier for this object; this is the objID column from SDSS DR9's photoTag table N/A meta.id;meta.main 1
ra Ra ICRS right ascension for this object from SDSS N/A pos.eq.ra;meta.main 1
dec Dec ICRS declination for this object from SDSS N/A pos.eq.dec;meta.main 1
dl Lum. Dist. Luminosity distance. This was calculated it with the LUMDIST program. Note ld Mpc pos.distance 5
z z Redshift taken from SDSS N/A src.redshift 5
abs_mr M_r Absolute stellar magnitude in the SDSS r band, calculated as Mr = modelMag_r - 5*log10(DL) - 25 - Extinction_r - kcorrect_r, where modelMag_r - the model magnitudes in a r-band; DL - luminosity distance; Extinction_r - Galactic extinction in r-band; kcorrect_r - k- correction in r-band. mag phys.magabs 5
morph Morph. Morphological type, E, S, or I Note m N/A src.morph.type 5
_r Dist. Distance to cone center deg pos.angDistance 10
modelmag_u m_u Model magnitude in the u band from SDSS DR9 mag phot.mag;em.opt.U 15
modelmag_g m_g Model magnitude in the g band from SDSS DR9 mag phot.mag;em.opt.V 15
modelmag_r m_r Model magnitude in the r band from SDSS DR9 mag phot.mag;em.opt.R 15
modelmag_i m_i Model magnitude in the i band from SDSS DR9 mag phot.mag;em.opt.I 15
modelmag_z m_z Model magnitude in the z band from SDSS DR9 mag phot.mag;em.opt.I 15
petror50_r R_50 Radius containing 50% of the Petrosian flux in the r-band. arcsec phys.angsize;src 15
petror90_r R_90 Radius containing 90% of the Petrosian flux in the r-band. arcsec phys.angsize;src 15
ext_u Ext. u Extinction in the u band following 1998wfsc.conf..297S, taken from SDSS DR9. mag phys.absorption;em.opt.U 25
kcorrect_u TBD TBD N/A TBD 25
ext_g Ext. g Extinction in the g band following 1998wfsc.conf..297S, taken from SDSS DR9. mag phys.absorption;em.opt.V 25
kcorrect_g TBD TBD N/A TBD 25
ext_r Ext. r Extinction in the r band following 1998wfsc.conf..297S, taken from SDSS DR9. mag phys.absorption;em.opt.R 25
kcorrect_r TBD TBD N/A TBD 25
ext_i Ext. i Extinction in the i band following 1998wfsc.conf..297S, taken from SDSS DR9. mag phys.absorption;em.opt.I 25
kcorrect_i TBD TBD N/A TBD 25
ext_z Ext. z Extinction in the z band following 1998wfsc.conf..297S, taken from SDSS DR9. mag phys.absorption;em.opt.I 25
kcorrect_z TBD TBD N/A TBD 25

Citation Info

VOResource XML (that's something exclusively for VO nerds)

Note ld

The following LUMDIST parameters were employed:

  • redshift of galaxy from SDSS,
  • H_0 = 71,
  • Ω_M = 0.27,
  • Λ_0 = 0.73

See https://idlastro.gsfc.nasa.gov/ftp/pro/astro/lumdist.pro

Note m

In morph, E stands for late types, S for Spirals, and I for late spirals and irregulars).

To determine the morphological classification of galaxies into these three classes we used dependence of the "inverse concentration index" (petroR50_r/petroR90_r) on the Mg-Mi color indices, where Mg-Mi = modelMag_g - modelMag_i - (Extinction_g - Extinction_i) - ( kcorrect_g - kcorrect_i).

More details see Melnyk O.V., Dobrycheva D.V., Vavilova I.B. Morphology and color indices of galaxies in Pairs: Criteria for the classification of galaxies. Astrophysics, 55(3), 293-305 (2012), 2012Ap.....55..293M