Information on Service 'zCOSMOS 20k Bright spectra'

Further access options are discussed below

Spectra from the third data release (DR3) of zCOSMOS 20k bright.

For a list of all services and tables belonging to this service's resource, see Information on resource 'zCOSMOS 20k Bright Spectra'

Service Documentation

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.

NOTES

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.

ACKNOWLEDGEMENTS

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be given in the text to the zCOSMOS project, referring to this release and Lilly et al. 2009, ApJS, 184, 218 until superseded by a later version.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.

Overview

You can access this service using:

ssap.xml -- a standard SSAP interface as defined by the IVOA to access spectral or time-series data; SSAP clients use https://vo.lam.fr/zcosmos_20k/q/ssa/ssap.xml? to access the service
form -- an interface for web browsers through an HTML form

This service is published as follows:

Within the set(s) ivo_managed with the renderer dali
Within the set(s) ivo_managed,local with the renderer form
Within the set(s) ivo_managed with the renderer ssap.xml

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Other services provided on the underlying data include:

Spatial Coverage

Input Fields

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

Name	Table Head	Description	Unit	UCD
APERTURE	Aperture	Angular diameter of aperture	deg	phys.angSize;instr.fov
BAND	Band	Wavelength (range) of interest (or symbolic bandpass names)	m	N/A
COLLECTION	Collection	A short handle naming the collection this spectrum belongs to.	N/A	N/A
COMPRESS	Compress?	Return compressed results?	N/A	N/A
CREATORDID	C. DID	Dataset identifier assigned by the creator	N/A	meta.id
FLUXCALIB	Calib Flux	Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).	N/A	N/A
FORMAT	Type	MIME type of the file served	N/A	meta.code.mime
maxrec	Match limit	Maximum number of records returned. Pass 0 to retrieve service parameters.	N/A	N/A
MTIME	Pub. Date	Date last published.	N/A	N/A
POS	Pos	ICRS position of target object	deg	N/A
PUBDID	P. DID	Dataset identifier assigned by the publisher	N/A	meta.ref.ivoid
REDSHIFT	z	Redshift of target object	N/A	src.redshift
REQUEST	Request type	This is queryData for the default operation; some services support getData as well	N/A	N/A
responseformat	Output Format	File format requested for output.	N/A	meta.code.mime
RUNID	Run id	An identifier for a certain run. Opaque to the service	N/A	N/A
SIZE	Size	Size of the region of interest around POS	deg	N/A
SNR	SNR	Signal-to-noise ratio estimated for this dataset	N/A	stat.snr
SPATRES	Res. Spc	Spatial resolution of data	deg	pos.angResolution
SPECRP	Specrp	Lower limit to spectral resolution power (λ/Δλ) as a single number.	N/A	N/A
TARGETCLASS	Ob. cls	Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible)	N/A	src.class
TARGETNAME	Object	Common name of object observed.	N/A	meta.id;src
TIME	Date Obs.	Midpoint of exposure (MJD)	N/A	time.epoch
TOP	#Best	Only return the TOP "best" records (on this service, this usually is equivalent to MAXREC, so no ranking is implied).	N/A	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
WAVECALIB	Calib. Spect.	Type of wavelength calibration	N/A	meta.code.qual
WILDTARGET	Name Pattern	Shell pattern of target observed (case insensitive)	N/A	N/A
WILDTARGETCASE	Name Pattern	Shell pattern of target observed (case sensitive)	N/A	N/A

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.

Name	Table Head	Description	Unit	UCD
accref	Product key	Access key for the data	N/A	meta.ref.url;meta.dataset
accsize	File size	Size of the data in bytes	byte	N/A
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
location_dec	Dec	N/A	deg	pos.eq.dec;meta.main
location_ra	RA	N/A	deg	pos.eq.ra;meta.main
mime	Type	MIME type of the file served	N/A	meta.code.mime
ssa_aperture	Aperture	Angular diameter of aperture	deg	phys.angSize;instr.fov
ssa_bandpass	Bandpass	Bandpass (i.e., rough spectral location) of this dataset; this should be the most appropriate term from the vocabulary http://www.ivoa.net/rdf/messenger.	N/A	instr.bandpass
ssa_binSize	Spect. Bin	Bin size in wavelength	m	em.wl;spect.binSize
ssa_cdate	Proc. Date	Processing/Creation date	N/A	time;meta.dataset
ssa_collection	Collection	A short handle naming the collection this spectrum belongs to.	N/A	N/A
ssa_creationtype	Using	Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction)	N/A	N/A
ssa_creator	Creator	Creator of the datasets included here.	N/A	N/A
ssa_creatorDID	C. DID	Dataset identifier assigned by the creator	N/A	meta.id
ssa_csysName	Sys	System RA and Dec are given in	N/A	N/A
ssa_cversion	C. Version	Creator assigned version for this dataset (will be incremented when this particular item is changed).	N/A	meta.version;meta.dataset
ssa_datasource	Src	Method of generation for the data (one of survey, pointed, theory, custom, artificial).	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_dstype	Data type	Type of data (spectrum, time series, etc)	N/A	N/A
ssa_fluxcalib	Calib Flux	Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).	N/A	N/A
ssa_fluxSI	[Flux]	Flux/magnitude conversion factor in Osuna-Salgado convention	N/A	N/A
ssa_fluxStatError	Err. flux	Statistical error in flux	N/A	stat.error;phot.flux.density;em
ssa_fluxSysError	Sys. Err flux	Systematic error in flux	N/A	stat.error.sys;phot.flux.density;em
ssa_fluxucd	UCD(flux)	UCD of the flux column	N/A	meta.ucd
ssa_fluxunit	unit(flux)	Unit of the flux column	N/A	meta.unit
ssa_instrument	Instrument	Instrument or code used to produce these datasets	N/A	meta.id;instr
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_model	Model	Data model name and version	N/A	N/A
ssa_pdate	Pub. Date	Date last published.	N/A	N/A
ssa_pubDID	P. DID	Dataset identifier assigned by the publisher	N/A	meta.ref.ivoid
ssa_publisher	Publisher	Publisher of the datasets included here.	N/A	meta.curation
ssa_redshift	z	Redshift of target object	N/A	src.redshift
ssa_reference	Ref.	URL or bibcode of a publication describing this data.	N/A	meta.bib.bibcode
ssa_score	Score	A measure of how closely the record matches your query. Higher numbers mean better matches.	N/A	N/A
ssa_snr	SNR	Signal-to-noise ratio estimated for this dataset	N/A	stat.snr
ssa_spaceCalib	Calib. Spc	Type of calibration in spatial coordinates	N/A	meta.code.qual
ssa_spaceError	Err. Spc	Statistical error in position	deg	stat.error;pos.eq
ssa_spaceRes	Res. Spc	Spatial resolution of data	deg	pos.angResolution
ssa_speccalib	Calib. Spect.	Type of wavelength calibration	N/A	meta.code.qual
ssa_specend	Band end	Upper value of spectral coordinate	m	em.wl;stat.max
ssa_specext	Bandwidth	Width of the spectrum	m	instr.bandwidth
ssa_specmid	Mid. Band	Midpoint of region covered in this dataset	m	instr.bandpass
ssa_specres	Spec. Res.	Resolution (in meters of wavelength) on the spectral axis	m	spect.resolution;em.wl
ssa_specstart	Band start	Lower value of spectral coordinate	m	em.wl;stat.min
ssa_spectralSI	[Spectral]	Spectral conversion factor in Osuna-Salgado convention	N/A	N/A
ssa_spectralucd	UCD(spectral)	UCD of the spectral column in the spectra served; when you have wavelengths, use em.wl for vacuum wavelengths, em.wl;obs.atmos for air wavelengths.	N/A	meta.ucd
ssa_spectralunit	unit(spectral)	Unit of the spectral column	N/A	meta.unit
ssa_spectStatError	Err. Spect	Statistical error in wavelength	m	stat.error;em
ssa_spectSysError	Sys. Err. Spect	Systematic error in wavelength	m	stat.error.sys;em
ssa_targclass	Ob. cls	Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible)	N/A	src.class
ssa_targetpos	Obj. pos	Equatorial (ICRS) position of the target object.	N/A	pos.eq;src
ssa_targname	Object	Common name of object observed.	N/A	meta.id;src
ssa_timeExt	Exp. Time	Exposure duration	s	time.duration
ssa_timeSI	[Time]	Time conversion factor in Osuna-Salgado convention.	N/A	N/A
zcosmos_id	zCOSMOS_ID	zCOSMOS identifier	N/A	meta.id

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.

Name	Table Head	Description	Unit	UCD	Verb. Level
accref	Product key	Access key for the data	N/A	meta.ref.url;meta.dataset	1
zcosmos_id	zCOSMOS_ID	zCOSMOS identifier	N/A	meta.id	1
cc	CC	Redshift Confidence Class Note 1	N/A	meta.code.qual;src.redshift	1
ssa_location	Location	ICRS location of aperture center	deg	pos.eq	5
ssa_dateObs	Date Obs.	Midpoint of exposure (MJD)	d	time.epoch	5
ssa_timeExt	Exp. Time	Exposure duration	s	time.duration	5
ssa_length	Length	Number of points in the spectrum	N/A	N/A	5
accsize	File size	Size of the data in bytes	byte	N/A	11
ssa_score	Score	A measure of how closely the record matches your query. Higher numbers mean better matches.	N/A	N/A	15
location_ra	RA	N/A	deg	pos.eq.ra;meta.main	15
location_dec	Dec	N/A	deg	pos.eq.dec;meta.main	15
ssa_dstitle	Title	A compact and descriptive designation of the dataset.	N/A	meta.title;meta.dataset	15
ssa_creatorDID	C. DID	Dataset identifier assigned by the creator	N/A	meta.id	15
ssa_pubDID	P. DID	Dataset identifier assigned by the publisher	N/A	meta.ref.ivoid	15
ssa_cdate	Proc. Date	Processing/Creation date	N/A	time;meta.dataset	15
ssa_pdate	Pub. Date	Date last published.	N/A	N/A	15
ssa_bandpass	Bandpass	Bandpass (i.e., rough spectral location) of this dataset; this should be the most appropriate term from the vocabulary http://www.ivoa.net/rdf/messenger.	N/A	instr.bandpass	15
ssa_cversion	C. Version	Creator assigned version for this dataset (will be incremented when this particular item is changed).	N/A	meta.version;meta.dataset	15
ssa_targname	Object	Common name of object observed.	N/A	meta.id;src	15
ssa_targclass	Ob. cls	Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible)	N/A	src.class	15
ssa_redshift	z	Redshift of target object	N/A	src.redshift	15
ssa_targetpos	Obj. pos	Equatorial (ICRS) position of the target object.	N/A	pos.eq;src	15
ssa_snr	SNR	Signal-to-noise ratio estimated for this dataset	N/A	stat.snr	15
ssa_aperture	Aperture	Angular diameter of aperture	deg	phys.angSize;instr.fov	15
ssa_specmid	Mid. Band	Midpoint of region covered in this dataset	m	instr.bandpass	15
ssa_specext	Bandwidth	Width of the spectrum	m	instr.bandwidth	15
ssa_specstart	Band start	Lower value of spectral coordinate	m	em.wl;stat.min	15
ssa_specend	Band end	Upper value of spectral coordinate	m	em.wl;stat.max	15
ssa_csysName	Sys	System RA and Dec are given in	N/A	N/A	15
ssa_spectralucd	UCD(spectral)	UCD of the spectral column in the spectra served; when you have wavelengths, use em.wl for vacuum wavelengths, em.wl;obs.atmos for air wavelengths.	N/A	meta.ucd	15
ssa_spectralunit	unit(spectral)	Unit of the spectral column	N/A	meta.unit	15
ssa_fluxucd	UCD(flux)	UCD of the flux column	N/A	meta.ucd	15
ssa_fluxunit	unit(flux)	Unit of the flux column	N/A	meta.unit	15
ssa_publisher	Publisher	Publisher of the datasets included here.	N/A	meta.curation	15
ssa_creator	Creator	Creator of the datasets included here.	N/A	N/A	15
ssa_collection	Collection	A short handle naming the collection this spectrum belongs to.	N/A	N/A	15
ssa_instrument	Instrument	Instrument or code used to produce these datasets	N/A	meta.id;instr	15
ssa_datasource	Src	Method of generation for the data (one of survey, pointed, theory, custom, artificial).	N/A	N/A	15
ssa_creationtype	Using	Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction)	N/A	N/A	15
ssa_reference	Ref.	URL or bibcode of a publication describing this data.	N/A	meta.bib.bibcode	15
ssa_fluxStatError	Err. flux	Statistical error in flux	N/A	stat.error;phot.flux.density;em	15
ssa_fluxSysError	Sys. Err flux	Systematic error in flux	N/A	stat.error.sys;phot.flux.density;em	15
ssa_fluxcalib	Calib Flux	Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).	N/A	N/A	15
ssa_binSize	Spect. Bin	Bin size in wavelength	m	em.wl;spect.binSize	15
ssa_spectStatError	Err. Spect	Statistical error in wavelength	m	stat.error;em	15
ssa_spectSysError	Sys. Err. Spect	Systematic error in wavelength	m	stat.error.sys;em	15
ssa_speccalib	Calib. Spect.	Type of wavelength calibration	N/A	meta.code.qual	15
ssa_specres	Spec. Res.	Resolution (in meters of wavelength) on the spectral axis	m	spect.resolution;em.wl	15
ssa_spaceError	Err. Spc	Statistical error in position	deg	stat.error;pos.eq	15
ssa_spaceCalib	Calib. Spc	Type of calibration in spatial coordinates	N/A	meta.code.qual	15
ssa_spaceRes	Res. Spc	Spatial resolution of data	deg	pos.angResolution	15
datalink	Datalink	A link to a datalink document for this spectrum.	N/A	meta.ref.url	15
mime	Type	MIME type of the file served	N/A	meta.code.mime	20
ssa_model	Model	Data model name and version	N/A	N/A	20
ssa_timeSI	[Time]	Time conversion factor in Osuna-Salgado convention.	N/A	N/A	20
ssa_spectralSI	[Spectral]	Spectral conversion factor in Osuna-Salgado convention	N/A	N/A	20
ssa_fluxSI	[Flux]	Flux/magnitude conversion factor in Osuna-Salgado convention	N/A	N/A	20
ssa_dstype	Data type	Type of data (spectrum, time series, etc)	N/A	N/A	20
owner	Owner	Owner of the data	N/A	N/A	25
embargo	Embargo ends	Date the data will become/became public	a	N/A	25

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

Note 1

Confidence Class of the redsfhit

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

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

Metadata

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