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Resource Description:
For a list of all services and tables belonging to this table's resource, see Information on resource 'zCOSMOS 20k Bright Spectra'
This table has an associated publication. If you use data from it, it may be appropriate to reference 2009ApJS..184..218L (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.
To cite the table as such, we suggest the following BibTeX entry:
![[Operator logo]](/static/img/logo_medium.png){kind=logo}
@MISC{vo:zcosmos_20k_raw_,
year=2020,
title={{zCOSMOS} 20k Bright Spectra},
author={Lilly et al.},
url={https://vo.lam.fr/tableinfo/zcosmos_20k.raw_data},
howpublished={{VO} resource provided by the {CeSAM} Virtual Observatory Server}
}
zCOSMOS is a large redshift survey undertaken in the COSMOS field using the VIMOS spectrograph mounted at the Melipal Unit Telescope of the VLT at ESO's Cerro Paranal Observatory, Chile.
This resource contain the 20,689 spectra of the DR3 release.
To the original zCOSMOS spectra, we added to the primary header the Z_SPEC keyword with the spectroscopic redshift and the CC one with the Confidence Class.
When using data products provided in this release, acknowledgement should please be given in the text to the zCOSMOS project, referring to this release and Lilly et al. 2009, ApJS, 184, 218 until superseded by a later version.
Please also make sure that the following statement appears in your acknowledgements when using these data:
Based on zCOSMOS observations carried out using the Very Large Telescope at the ESO Paranal Observatory under Programme ID: LP175.A-0839.
Sorted alphabetically. [Sort by DB column index]
| Name | Table Head | Description | Unit | UCD |
|---|---|---|---|---|
| accref | Product key | Access key for the data | N/A | meta.ref.url |
| accsize | File size | Size of the data in bytes | byte | VOX:Image_FileSize |
| cc | CC | Redshift Confidence Class [Note 1] | N/A | meta.code.qual;src.redshift |
| datalink | Datalink | A link to a datalink document for this spectrum. | N/A | meta.ref.url |
| embargo | Embargo ends | Date the data will become/became public | a | N/A |
| mime | Type | MIME type of the file served | N/A | meta.code.mime |
| owner | Owner | Owner of the data | N/A | N/A |
| ssa_dateObs | Date Obs. | Midpoint of exposure (MJD) | d | time.epoch |
| ssa_dstitle | Title | A compact and descriptive designation of the dataset. | N/A | meta.title;meta.dataset |
| ssa_length | Length | Number of points in the spectrum | N/A | N/A |
| ssa_location | Location | ICRS location of aperture center | deg | pos.eq |
| ssa_redshift | z | Redshift of target object | N/A | src.redshift |
| ssa_snr | SNR | Signal-to-noise ratio estimated for this dataset | N/A | stat.snr |
| ssa_specend | Band end | Upper value of spectral coordinate | m | em.wl;stat.max |
| ssa_specstart | Band start | Lower value of spectral coordinate | m | em.wl;stat.min |
| ssa_targname | Object | Common name of object observed. | N/A | meta.id;src |
| ssa_timeExt | Exp. Time | Exposure duration | s | time.duration |
| zcosmos_id | zCOSMOS_ID | zCOSMOS identifier | N/A | meta.id |
Columns that are parts of indices are marked like this.
The following services may use the data contained in this table:
VO nerds may sometimes need VOResource XML for this table.
Unit digit (b in ab.c) represents the confidence class:
CC Description Spectroscopic verification Photo-z consistency within dz=0.08(1+z) 4 Very secure redshift, beautiful redshift >99.5% 97% 3 Secure redshift >99.5% 97% 9 One line redshift (best guess) 95% (after correction) 84%-95% (after correction with photo-z) 2 Probable redshift 92% 93% 1 Insecure redshift 70% 72% 0 Unidentified spectrum
the decimal (.c) represents the Spectroscopic/photometric consistency:
.5 Spectroscopic redshift consistent within 0.08(1+z) of the photometric redshift, both for galaxies, stars and AGN. .4 No photometric redshift available, includes all spectroscopic AGN and stars .3 Special case for Class 18 and 9: Consistent with photo-z only after the redshift changed to the alternate redshift, a switch which is then applied .1 Spectroscopic and photometric redshifts are not consistent at the level of 0.08(1+z)
the tens (a in ab.c) is
0 Galaxies and stars 1 (+10) Broad line AGN 2 (+20) Secondary targets