Table information for 'liujun.liujun'


This table is available for ADQL queries and through the TAP endpoint.

Resource Description:

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 table's resource, see Information on resource 'XAO AGN Flux Monitoring Data'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

  title={{XAO} {AGN} Flux Monitoring Data},
  author={Zhang Hailong, Cui Lang},
  howpublished={{VO} resource provided by the {XAO} Data Center}


Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
accref Product key Access key for the data N/A meta.ref.url
owner Owner Owner of the data N/A N/A
embargo Embargo ends Date the data will become/became public a N/A
mime Type MIME type of the file served N/A meta.code.mime
accsize File size Size of the data in bytes byte VOX:Image_FileSize
ra RA Area center RA ICRS deg pos.eq.ra;meta.main
dec Dec Area center Declination ICRS deg pos.eq.dec;meta.main
coverage Coverage Field covered by the point deg N/A
date_obs Date_obs Observation date d time.obs
object Target Object Object observed N/A;meta.main

Columns that are parts of indices are marked like this.


The following services may use the data contained in this table:


VO nerds may sometimes need VOResource XML for this table.

Copyright and such: 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