Information on Service 'A Database of Circumstellar OH Masers'

Further access options are discussed below

A all-sky compilation of galactic stellar sources observed for OH maser emission in the transitions at 1612, 1665, and 1667 MHz. The database contains OH maser observations selected from the literature . These observations belong to more than 6000 different objects. The database consists of three tables: The main table ("masers"), interferometric followup observations ("maps") and monitoring programs ("monitor").

For a list of all services and tables belonging to this service's resource, see Information on resource 'A Database of Circumstellar OH Masers'

Overview

You can access this service using:

external -- a renderer with some custom access method that should be mentioned in the service description
form -- an interface for web browsers through an HTML form
scs.xml -- a standard SCS interface as defined by the IVOA to access catalog-type data; SCS clients use http://dc.zah.uni-heidelberg.de/ohmaser/q/scs/scs.xml? to access the service
static -- static (i.e. prepared) data or custom client-side code; probably used to access ancillary files here

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 external
Within the set(s) ivo_managed with the renderer scs.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
DEC	Delta (ICRS)	Declination (ICRS decimal)	deg	pos.eq.dec
flux_dens_blue	Flux Blue	Flux Density of the blue-shifted maser peak. For single-peak masers it contains its flux density.	Jy	phot.flux.density;em.radio.1500-3000MHz
flux_dens_red	Flux Red	Flux Density of the red-shifted maser peak. It contains the flux density for a single peak maser, if it corresponds to the red-shifted peak in other observations.	Jy	phot.flux.density;em.radio.1500-3000MHz
frequency	Freq	Observed frequency	MHz	em.freq
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
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
veloc_shell	Expansion Vel.	Outflow Velocity of the shell. If vexp is not given in the reference it is calculated.	km/s	phys.veloc.expansion;pos.bodyrc
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

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
_r	Dist.	Distance to cone center	deg	pos.distance
dej2000	Dec J2000	Selected best Dec, J2000	deg	pos.eq.dec;meta.main
flux_dens_blue	Flux Blue	Flux Density of the blue-shifted maser peak. For single-peak masers it contains its flux density.	Jy	phot.flux.density;em.radio.1500-3000MHz
flux_dens_flag	Flux. Dens. Flag.	NULL -- flux density columns contain detections; < -- non-detection at level flux density blue (3 sigma); > -- flux density blue contains a lower limit for the flux; = -- source only gives fluxes; . -- flux density blue contains probable detection; : -- flux density red contains probable detection; & -- both flux densities contain probable detections	N/A	meta.code
flux_dens_red	Flux Red	Flux Density of the red-shifted maser peak. It contains the flux density for a single peak maser, if it corresponds to the red-shifted peak in other observations.	Jy	phot.flux.density;em.radio.1500-3000MHz
frequency	Freq	Observed frequency	MHz	em.freq
mapurl	Map	URL to information on an interferometric followup observation for this object.	N/A	meta.ref.url
measure_no	ID	Unique measurement identifier	N/A	meta.id;meta.main
monitorurl	Monitor	URL to information on a monitor programme for this object.	N/A	meta.ref.url
raj2000	RA J2000	Selected best RA, J2000	deg	pos.eq.ra;meta.main
ref_key	Ref	Internal key for the originating paper, see ohmasers.bibrefs.	N/A	meta.bib
source_name	Source	Name of the observed source. The name given in the reference is usually kept.	N/A	meta.id
veloc_blue	Vel. Blue	Velocity of the blue-shifted maser peak. For single-peak masers it contains the line velocity.	km/s	phys.veloc.expansion;pos.bodyrc
veloc_central	Radial velocity	Radial velocity of the central star. If veloc_central is not given in the reference, it is calculated.	km/s	phys.veloc.expansion;pos.bodyrc
veloc_red	Vel. Red	Velocity of the red-shifted maser peak in km/s. It contains the line velocity for a single peak maser if it corresponds to the red-shifted peak in other observations.	km/s	phys.veloc.expansion;pos.bodyrc
veloc_shell	Expansion Vel.	Outflow Velocity of the shell. If vexp is not given in the reference it is calculated.	km/s	phys.veloc.expansion;pos.bodyrc

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
measure_no	ID	Unique measurement identifier	N/A	meta.id;meta.main	1
frequency	Freq	Observed frequency	MHz	em.freq	5
_r	Dist.	Distance to cone center	deg	pos.distance	10
ref_key	Ref	Internal key for the originating paper, see ohmasers.bibrefs.	N/A	meta.bib	10
raj2000	RA J2000	Selected best RA, J2000	deg	pos.eq.ra;meta.main	10
dej2000	Dec J2000	Selected best Dec, J2000	deg	pos.eq.dec;meta.main	10
source_name	Source	Name of the observed source. The name given in the reference is usually kept.	N/A	meta.id	15
veloc_blue	Vel. Blue	Velocity of the blue-shifted maser peak. For single-peak masers it contains the line velocity.	km/s	phys.veloc.expansion;pos.bodyrc	15
veloc_red	Vel. Red	Velocity of the red-shifted maser peak in km/s. It contains the line velocity for a single peak maser if it corresponds to the red-shifted peak in other observations.	km/s	phys.veloc.expansion;pos.bodyrc	15
veloc_central	Radial velocity	Radial velocity of the central star. If veloc_central is not given in the reference, it is calculated.	km/s	phys.veloc.expansion;pos.bodyrc	15
veloc_shell	Expansion Vel.	Outflow Velocity of the shell. If vexp is not given in the reference it is calculated.	km/s	phys.veloc.expansion;pos.bodyrc	15
flux_dens_flag	Flux. Dens. Flag.	NULL -- flux density columns contain detections; < -- non-detection at level flux density blue (3 sigma); > -- flux density blue contains a lower limit for the flux; = -- source only gives fluxes; . -- flux density blue contains probable detection; : -- flux density red contains probable detection; & -- both flux densities contain probable detections	N/A	meta.code	15
flux_dens_blue	Flux Blue	Flux Density of the blue-shifted maser peak. For single-peak masers it contains its flux density.	Jy	phot.flux.density;em.radio.1500-3000MHz	15
flux_dens_red	Flux Red	Flux Density of the red-shifted maser peak. It contains the flux density for a single peak maser, if it corresponds to the red-shifted peak in other observations.	Jy	phot.flux.density;em.radio.1500-3000MHz	15
rapub	RA pub.	RA of object, from source	deg	pos.eq.ra	15
depub	Dec pub.	Dec of object, from source	deg	pos.eq.dec	15
mapurl	Map	URL to information on an interferometric followup observation for this object.	N/A	meta.ref.url	15
monitorurl	Monitor	URL to information on a monitor programme for this object.	N/A	meta.ref.url	15
spec_type	Sp. Type	S -- Single peak of maser emission; D -- Double peak of maser emission; I -- Irregular spectral profile, multiple emission peaks.	N/A	meta.code;src.spType	20
int_flux_red	Int. Red	Integrated flux of red peak	1e-22W.m**-2	phot.flux.density;em.radio.1500-3000MHz	20
int_flux_blue	Int. Blue	Integrated flux of blue peak	1e-22W.m**-2	phot.flux.density;em.radio.1500-3000MHz	20
veloc_err	Vel. Resolution	Uncertainty of velocity values. Taken from the velocity resolution of the observation. It is actually a lower limit of the uncertainty, because the lines are usually much broader than velocity resolution of the observing equipment.	km/s	stat.error;phys.veloc.expansion;pos.bodyrc	21
flag	Quality	Non-null if this measurement is considered the best available at a particular frequency. Lower means higher confidence.	N/A	meta.code	25
ra_raw	RA (orig)	J2000 RA	N/A	pos.eq.ra	25
de_raw	Dec (orig)	J2000 Dec	N/A	pos.eq.dec	25
source_no	Source id	Unique, artificial source identifier	N/A	meta.code	29

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

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