Information on Service 'A Database of Circumstellar OH Masers'

[Use this service from your browser]

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:

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:

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):

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
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.

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
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-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
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)