Radio Astronomy Observatory
UMRAO Database Interface
For background information, see the discussion of the U of M Radio Astronomy Observatory. The description and plots given below were last updated on November 13, 2009. (Click for revision history.)
The UMRAO total flux density data are currently being edited and prepared
for publication in a compendium paper which will be
submitted to ApJ Supplement.The linear polarization data will be included in a separate publication. Currently, longterm light curves showing two-week averages of the
total flux density for selected sources can be viewed using the links in the table below. We will
soon be adding tabular data providing daily averages of both total flux density and linear
polarization for a set of gamma-ray-bright sources which are being intensively monitored
in a new program which commenced in September 2009 funded by the Fermi guest investigator program.
Be aware that the UMRAO data may still contain an occasional bad measurement.
No light curves, or analysis
of these data, may be included in papers submitted for publication
without the consent and knowledge of Hugh or Margo Aller. The data shown
on this website are provided as a service to the astronomical community with
the specific intent that they be used for calibrating data obtained with
other radio instruments, for placing observations obtained with other
instruments in context, and for selecting currently active objects or objects
with specific variability properties for inclusion in future observing
proposals with other instruments. If any publication makes use of the long term data
in these specified ways, please add the following acknowledgement: `This
research has made use of data from the University of Michigan Radio Astronomy
Observatory which has been supported by the University of Michigan and by a series of
grants from the National Science Foundation, most recently AST-0607523.'
Once you are ready to query the database, click on the buttons corresponding
to the sources that interest you and/or enter a source name by hand using the
1950 position ID (e.g., 1652+398) in the appropriate dialog box; type your full
e-mail address into the dialog box, change the start and stop dates and
averaging interval as desired, select the "mode" Then click on the "dispatch
box". NOTE: using the "hop to" buttons will clear all your entries, and so
you must use "scroll" to move through the document once you start entering
values.
The start and stop dates (there are defaults) should be in YYMMDD format.
The default start date (900101) will bring up the recent data, but for many
sources earlier data are also available.
The averaging interval (the default is 30 days) should be given in days, and
lie between 1 and 10000. Choose one of
S only ,
SPX ,
SQU
for the format of the returned data. Choose What data exist? for a report on
what data are available in the database for the checked sources. (Dates and
averaging not then used.)
What's New:
As time permits, we are adding plots of selected sources to the database. The
plots are indicated by the notations S or SPX following a
source name. S indicates total flux density only, while SPX denotes that both linear polarization and total flux density
are shown. All data are 14-day averages of the individual UMRAO measurements. The linear polarization is given in the form of
electric vector position angle (X) and fractional linear polarization (P). Please note when comparing these results with VLBI data that
the EVPA range is 0-180 degrees and not 0-360 degrees due to ambiguities in their determination.
Questions and input appreciated:
| Email Hugh or Margo Aller if there are questions during this revision period. | No email, or want to be anonymous? (We don't look at this input frequently!) |
|---|---|
 mfa@umich.edu |
Go to:
the Astronomy Department homepage;
Document prepared by pah/12-94. Revised pah/07-00. Revised mfa/03-09
