Information on Service 'HerMES SCAT250 (blind SPIRE 250µm extraction)'

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Further access options are discussed below

SPIRE catalogues from the Herschel Extragalactic Legacy Project.

For a list of all services and tables belonging to this service's resource, see Information on resource 'HELP SPIRE catalogues'

Service Documentation

The Herschel Extragalactic Legacy Project (HELP) intends to produce a multi-wavelength, comprehensive data set of the galaxy population at high redshift. The Herschel Space Observatory has the unique property of being able to probe the presence of star formation in extremely dusty galaxies through observations of the far infra-red and sub-millimetre portion of the electromagnetic spectrum. However, Herschel has relatively poor spatial resolution, making it difficult to disentangle which galaxies are responsible for what amount of flux.

HELP aims to robustly address this issue with the use of as many complimentary data sets as possible. With the inclusion of data at shorter wavelengths (such as the optical, radio and near-infra-red), which have much higher spatial resolution, the deblending of Herschel flux into component parts can be undertaken in a much more robust, informed manner. The ultimate goal of HELP is to produce a multi-wavelength data set, which will be easy to use so that astronomers not currently used to working with Herschel data or high redshift surveys could make use of the statistical samples found within the HELP catalogue.

These are the Herschel SPIRE catalogues from HELP.

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
F_SPIRE250 F_SPIRE250 Flux density at 250 micron mJy phot.flux;em.mm.750-1500GHz;meta.main
Field Field Name of the field in the HerMES survey N/A meta.id;obs.field
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
IAU_name IAU name IAU name of the source N/A meta.id;meta.main
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
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
Dec Dec Declination deg pos.eq.dec;meta.main
F_SPIRE250 F_SPIRE250 Flux density at 250 micron mJy phot.flux;em.mm.750-1500GHz;meta.main
FErr_SPIRE250 FErr_SPIRE250 Error (inst.) in flux density at 250 micron mJy stat.error;phot.flux;em.mm.750-1500GHz
FErrTot_SPIRE250 FErrTot_SPIRE250 Total error (inst.+conf.) in flux density at 250 micron mJy stat.error;phot.flux;em.mm.750-1500GHz
Flag Flag Flag giving additional information on the source Note scatflag N/A meta.code
gID gID ID of the segment where the source is N/A meta.id
IAU_name IAU name IAU name of the source N/A meta.id;meta.main
RA RA Right Ascension deg 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
IAU_name IAU name IAU name of the source N/A meta.id;meta.main 20
RA RA Right Ascension deg pos.eq.ra;meta.main 20
Dec Dec Declination deg pos.eq.dec;meta.main 20
F_SPIRE250 F_SPIRE250 Flux density at 250 micron mJy phot.flux;em.mm.750-1500GHz;meta.main 20
FErr_SPIRE250 FErr_SPIRE250 Error (inst.) in flux density at 250 micron mJy stat.error;phot.flux;em.mm.750-1500GHz 20
FErrTot_SPIRE250 FErrTot_SPIRE250 Total error (inst.+conf.) in flux density at 250 micron mJy stat.error;phot.flux;em.mm.750-1500GHz 20
gID gID ID of the segment where the source is N/A meta.id 20
Flag Flag Flag giving additional information on the source Note scatflag N/A meta.code 20
Field Field Name of the field in the HerMES survey N/A meta.id;obs.field 30
Chi250 Chi250 Local reduced chi2 statistic of photometry fit in 11x11 pixel window N/A stat.fit.chi2 30
gSize gSize Number of sources in the segment gID N/A meta.number 30
Bkg250 Bkg250 Background substracted from 250 micron map N/A instr.background;em.mm.750-1500GHz; 30

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

Note scatflag

The source extracted from the deepest part of the CDFS-SWIRE map are flagged with "goods-s".