Information on Service 'LAMOST DR5 survey spectra'

Further access options are discussed below

This services provides 1D spectra from DR5 of LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) through SSAP; data is served both in VO-standard SDM and, via datalink, the original SDSS-inspired FITS described in http://dr5.lamost.org/doc/data-production-description .

For a list of all services and tables belonging to this service's resource, see Information on resource 'LAMOST DR5 survey spectra'

Overview

You can access this service using:

form -- an interface for web browsers through an HTML form
ssap.xml -- a standard SSAP interface as defined by the IVOA to access spectral or time-series data; SSAP clients use https://dc.zah.uni-heidelberg.de/lamost5/q/ssa/ssap.xml? to access the service

Coverage

0.139081 3.35094 eV

2011.81 2017.46

This service is published as follows:

Within the set(s) ivo_managed with the renderer dali
Within the set(s) local,ivo_managed 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:

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
dej2000	Dej2000	Main value of declination	deg	pos.eq.dec;meta.main
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
preview	Preview	URL of a preview for the dataset	N/A	meta.ref.url;meta.preview
raj2000	Raj2000	Observed RA of the object	deg	pos.eq.ra;meta.main
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_cdate	Proc. Date	Processing/Creation date	N/A	time;meta.dataset
ssa_creatorDID	C. DID	Dataset identifier assigned by the creator	N/A	meta.id
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_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_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_redshift	z	Redshift of target object	N/A	src.redshift
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_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_specstart	Band start	Lower value of spectral coordinate	m	em.wl;stat.min
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

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
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
preview	Preview	URL of a preview for the dataset	N/A	meta.ref.url;meta.preview	15
mime	Type	MIME type of the file served	N/A	meta.code.mime	20
raj2000	Raj2000	Observed RA of the object	deg	pos.eq.ra;meta.main	20
dej2000	Dej2000	Main value of declination	deg	pos.eq.dec;meta.main	20
owner	Owner	Owner of the data	N/A	N/A	25
embargo	Embargo ends	Date the data will become/became public	yr	N/A	25
ssa_targsubclass	Ob. subcls	Object subclass	N/A	N/A	25

Copyright, License, Acknowledgements

The data was obtained from http://dr5.lamost.org/v3/ – terms and condition may apply.

The metadata descriptions were provided in part by the Czech VO, in particular Petr Skoda and Jiri Nadvornik.

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