Information on Service 'BGDS DR2 Mean Photometry Cone Search'

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Extracted sources from the Bochum Galactic Disk Survey. We provide median photometry in U, B, V, z, r, and i broadbands as well as the narrow bands OIII, NB, Halpha and SII for particular fields. Note that sources in different bands are not matched. Also, sources sitting in the regions imaged in multiple fields have not been matched even within one band. BGDS light curves are available in i and r for all fields and partially in U, B, V, z, OIII, NB, Halpha and SII in a separate SSAP service and via TAP.

For a list of all services and tables belonging to this service's resource, see Information on resource 'BGDS DR2 time series'

Service Documentation

The time series from BGDS DR2 by default come as IVOA Spectral Data Model compliant VOTables. If you what plain text instead, add &format=txt to the dlget URIs. The columns you get back then are epoch in MJD, magnitude and magnitude error in mag, and a link to a cutout showing where the measurement came from.

Overview

You can access this service using:

Coverage

Intervals of messenger energies reflected in this resource: 1.10912 4.1325 eV

Time covered by this resource's data: 2010.69 2019.73

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
amp Amplitude Difference between brightest and weakest observation. mag phot.mag;em.opt.U;arith.diff
band_name Filter The band the mean photometry is given for. N/A meta.id;instr.filter
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
err_med_mag Err〈mag〉 Error in med_mag mag stat.error;phot.mag
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
med_mag 〈mag〉 Median magnitude in the band given by filter mag phot.mag
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
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
amp Amplitude Difference between brightest and weakest observation. mag phot.mag;em.opt.U;arith.diff
band_name Filter The band the mean photometry is given for. N/A meta.id;instr.filter
dec Dec ICRS declination for this object. N/A pos.eq.dec;meta.main
err_flux Err〈flux〉 Error in median flux in the Johnson U band mJy stat.error;phot.flux
err_med_mag Err〈mag〉 Error in med_mag mag stat.error;phot.mag
field Field Survey field observed. N/A meta.id;obs.field
flux 〈flux〉 Median flux in the band given by the filter column; this is computed from the median magnitude based on Landolt standard stars. mJy phot.flux
med_mag 〈mag〉 Median magnitude in the band given by filter mag phot.mag
obs_id Obs_id Main identifier of this observation (a single object may have multiple observations in different bands and fields) N/A meta.id;meta.main
ra Ra ICRS right ascension for this object. N/A pos.eq.ra;meta.main

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
band_name Filter The band the mean photometry is given for. N/A meta.id;instr.filter 1
obs_id Obs_id Main identifier of this observation (a single object may have multiple observations in different bands and fields) N/A meta.id;meta.main 1
ra Ra ICRS right ascension for this object. N/A pos.eq.ra;meta.main 1
dec Dec ICRS declination for this object. N/A pos.eq.dec;meta.main 1
med_mag 〈mag〉 Median magnitude in the band given by filter mag phot.mag 5
flux 〈flux〉 Median flux in the band given by the filter column; this is computed from the median magnitude based on Landolt standard stars. mJy phot.flux 5
_r Dist. Distance to cone center deg pos.distance 10
amp Amplitude Difference between brightest and weakest observation. mag phot.mag;em.opt.U;arith.diff 15
field Field Survey field observed. N/A meta.id;obs.field 15
err_med_mag Err〈mag〉 Error in med_mag mag stat.error;phot.mag 15
err_flux Err〈flux〉 Error in median flux in the Johnson U band mJy stat.error;phot.flux 15
nobs #Obs Number of observations in this light curve N/A meta.number;obs 25

If you use GDS data, please cite 2015AN....336..590H.

Citation Info

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