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Information on Service '1WHSP blazar candidates catalog'

The catalog 1WHSP is the result of a multi-frequency selection for blazars like SED, further filtered using IR-radio and IR-X-ray flux-ratios. The sample assembled contains almost 992 sources of HSP blazars, of which 425 are previously known blazars, 151 new identifications and 416 blazar candidates. On the very high energy trend, 299 are confirmed GeV gamma-ray photons emitters and 36 have already been detected in the TeV band.

For a list of all services and tables belonging to this service's resource, see Information on resource 'WISE High Synchroton Peak blazar candidates catalog'

Service Documentation

We assembled a sample including 992 sources, which is currently the largest existing list of confirmed and candidates HSP blazars. All objects are expected to radiate up to the highest gamma-ray photon energies. In fact, 299 of these are confirmed emitters of GeV gamma-ray photons (based on Fermi-LAT catalogues), and 36 have already been detected in the TeV band. The majority of sources in the sample are within reach of the upcoming Cherenkov Telescope Array (CTA), and many may be detectable even by the current generation of Cherenkov telescopes during flaring episodes. The sample includes 425 previously known blazars, 151 new identifications, and 416 HSP candidates (mostly faint sources) for which no optical spectra is available yet. The sample was defined starting from a primary list of infrared colour-colour selected sources from the ALLWISE all sky survey database, and applying further restrictions on IR-radio and IR-X-ray flux ratios. Using a polynomial fit to the multi-frequency data (radio to X-ray) we estimated synchrotron peak frequencies and fluxes of each object.

Overview

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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, gavo means it is within GAVO's service registry.

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
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
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
asdc_link asdc sed tool N/A N/A N/A
blazar_type Blazar type Blazar extended information flag Note blazar_type N/A meta.code
BZcat_name BZcat name BZcat designation if any N/A meta.id.cross
decj2000 Dec Declination deg pos.eq.dec;meta.main
Fermi_gr_slope Gamma-ray slope Gamma-ray slope from Fermi N/A obs.param
Fermi_gr_slope_error Gamma-ray slope error Error on gamma-ray slope from Fermi N/A stat.error;obs.param
Fermi_name Fermi name Fermi designation if any N/A meta.id.assoc
flux_peak log(flux peak) Flux peak log(erg.cm**-2.s**-1) em.freq
id id Internal id N/A meta
name name Designation N/A meta.id;meta.main
nu_flag nu-flag Frequency peak measurement quality flag Note nu_flag N/A meta.code
nu_peak log(nu peak) Synchroton frequency peak log(Hz) em.freq
radio_flux Radio flux density Radio flux density, NVSS or FIRST mJy phot.flux;em.radio
raj2000 RA Right ascension deg pos.eq.ra;meta.main
TEV_FOM TeV FOM TeV figure-of-merit estimated flux (E>50GeV) unknown obs.param
WISE_mag IR mag WISE magnitude mag phot.mag;em.IR
z z redshift N/A src.redshift
z_flag z-flag redshift quality flag Note z_flag N/A meta.code

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
asdc_link asdc sed tool N/A N/A N/A 1
name name Designation N/A meta.id;meta.main 1
raj2000 RA Right ascension deg pos.eq.ra;meta.main 1
decj2000 Dec Declination deg pos.eq.dec;meta.main 1
WISE_mag IR mag WISE magnitude mag phot.mag;em.IR 1
radio_flux Radio flux density Radio flux density, NVSS or FIRST mJy phot.flux;em.radio 1
z z redshift N/A src.redshift 1
z_flag z-flag redshift quality flag Note z_flag N/A meta.code 1
nu_peak log(nu peak) Synchroton frequency peak log(Hz) em.freq 1
nu_flag nu-flag Frequency peak measurement quality flag Note nu_flag N/A meta.code 1
flux_peak log(flux peak) Flux peak log(erg.cm**-2.s**-1) em.freq 1
blazar_type Blazar type Blazar extended information flag Note blazar_type N/A meta.code 1
Fermi_gr_slope Gamma-ray slope Gamma-ray slope from Fermi N/A obs.param 1
Fermi_gr_slope_error Gamma-ray slope error Error on gamma-ray slope from Fermi N/A stat.error;obs.param 1
TEV_FOM TeV FOM TeV figure-of-merit estimated flux (E>50GeV) unknown obs.param 1
id id Internal id N/A meta 20
BZcat_name BZcat name BZcat designation if any N/A meta.id.cross 20
Fermi_name Fermi name Fermi designation if any N/A meta.id.assoc 20

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

Note blazar_type

Status on previous knowledge of the source

0 already known HSP
1 HSP candidate; lacks optical spectrum
2 complementary source from Sedentary catalog
3 in WISE database of extended sources
4 complementary TeV detected HSPs
5 newly identified HSP
Note nu_flag

Quality of frequency peak measurement

1 good estimate
2 uncertain
3 lower limit
Note z_flag

Quality/source of the redshift value

0 no redshift
1 trustfull redshift
2 uncertain value from the literature
3 lower limit based on R-magnitude