Information on Service 'A Database of Circumstellar OH Masers'

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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:

This service is published as follows:

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):

NameTable Head DescriptionUnitUCD
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.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
de_raw Dec (orig) J2000 Dec N/A pos.eq.dec
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
ra_raw RA (orig) J2000 RA N/A pos.eq.ra
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_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
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.

NameTable Head DescriptionUnitUCD 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
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
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
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-22 W.m**-2 phot.flux.density;em.radio.1500-3000MHz 20
int_flux_blue Int. Blue Integrated flux of blue peak 1e-22 W.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
ra_raw RA (orig) J2000 RA N/A pos.eq.ra 25
de_raw Dec (orig) J2000 Dec N/A pos.eq.dec 25
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
source_no Source id Unique, artificial source identifier N/A meta.code 29

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