Information on Service 'XAO AGN Flux Monitoring Data'

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Active Galactic Nuclei (AGNs) are extragalactic objects characterized by extremely complex physical processes and strong temporal flux variability over almost the whole electromagnetic spectrum, which play a very important role in studying the formation and evolution of galaxies, cosmology and many other astrophysical problems. Flux variability is one of the most remarkable observational characteristics of AGNs and the variability time scales are from minutes to dozens of years. Multi-wavelength flux monitoring is the main means to study the nature of AGN flux variability.

In order to systematically study the total flux variability of AGNs in radio band, we launched a long-term program, which is called the quasi- Simultaneous Multiwavelength Monitoring of AGNs with the Nanshan 26-m radio telescope of Xinjiang Astronomical Observatory (XAO), namely SMMAN program. The monitoring data were acquired monthly with the cross-scan mode at C-band (4.8 GHz) and K-band (23.6 GHz) for a sample of about 100 AGNs selected from Fermi-LAT suvery. Additionally, we also conducted weekly monitoring observations or Intra-Day Vairibility (IDV) observations for some of flaring Blazars to reveal their more complex variability time scales.

For a list of all services and tables belonging to this service's resource, see Information on resource 'XAO AGN Flux Monitoring Data'

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.

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
accref Product key Access key for the data N/A meta.ref.url
date_obs Date_obs Observation date d time.obs
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
object Target Object Object observed N/A meta.id;meta.main
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
accref Product key Access key for the data N/A meta.ref.url
accsize File size Size of the data in bytes byte VOX:Image_FileSize
coverage Coverage Field covered by the point deg N/A
date_obs Date_obs Observation date d time.obs
dec Dec Area center Declination ICRS deg pos.eq.dec;meta.main
ipix Ipix q3c ipix for this row's position Q3C_ID N/A
object Target Object Object observed N/A meta.id;meta.main
obsURL Download Link to retrieve data N/A N/A
ra RA Area center RA ICRS 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
accref Product key Access key for the data N/A meta.ref.url 1
accsize File size Size of the data in bytes byte VOX:Image_FileSize 11
mime Type MIME type of the file served N/A meta.code.mime 20
ra RA Area center RA ICRS deg pos.eq.ra;meta.main 20
dec Dec Area center Declination ICRS deg pos.eq.dec;meta.main 20
coverage Coverage Field covered by the point deg N/A 20
date_obs Date_obs Observation date d time.obs 20
object Target Object Object observed N/A meta.id;meta.main 20
owner Owner Owner of the data N/A N/A 25
embargo Embargo ends Date the data will become/became public a N/A 25

The data from XAO have been obtained with Xinjiang Nanshan 25M Radio Telescope. And all data are not in the public domain. If you want to use the data for your research, send a request to zhanghailong@xao.ac.cn.

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