Million-Quasar (Milliquas) Catalog now available

A catalog of 1,067,648 quasars is available from Quasars.Org, It is
19 Mb zipped. A ReadMe is provided which gives full details, file
layout, and references for the source data.

The data is de-duplicated across the source catalogs, and photometry
is supplied from APM and USNO-A optical data. Sample data is
available for quick browsing on the web page.


Get it at: http://quasars.org/milliquas.htm


QUASARS.ORG. There is no second place.

Eric Flesch

(Eric Flesch) wrote in news:49f2e6b6.54309225
@freenews.netfront.net:

A catalog of 1,067,648 quasars is available from Quasars.Org, It is
19 Mb zipped. A ReadMe is provided which gives full details, file
layout, and references for the source data.

The data is de-duplicated across the source catalogs, and photometry
is supplied from APM and USNO-A optical data. Sample data is
available for quick browsing on the web page.

Get it at: http://quasars.org/milliquas.htm

Overlay the asymmetries in this data onto those from WMAP.

On Sat, 25 Apr 2009, Bluuuue Rajah Bluuuuue@Rajah. wrote:
(Eric Flesch) wrote
Get it at: http://quasars.org/milliquas.htm

Overlay the asymmetries in this data onto those from WMAP.

The data is not isotropic because, as a compendium of the literature,
it is entirely dependent on original survey parameters (i.e., more
work has been done in some directions than in others).

(Eric Flesch) wrote in news:49f31f8f.537714
@freenews.netfront.net:

On Sat, 25 Apr 2009, Bluuuue Rajah Bluuuuue@Rajah. wrote:
(Eric Flesch) wrote
Get it at: http://quasars.org/milliquas.htm

Overlay the asymmetries in this data onto those from WMAP.

The data is not isotropic because, as a compendium of the literature,
it is entirely dependent on original survey parameters (i.e., more
work has been done in some directions than in others).

And none at all, I suppose, in some regions of the sky. ;(

On Sat, 25 Apr 2009, Bluuuue Rajah Bluuuuue@Rajah. wrote:
(Eric Flesch) wrote in news:49f31f8f.537714
The data is not isotropic because, as a compendium of the literature,
it is entirely dependent on original survey parameters (i.e., more
work has been done in some directions than in others).

And none at all, I suppose, in some regions of the sky. ;(

There is at least cursory coverage in all places except for the Zone
of Avoidance, i.e. plane of the Galaxy. But you require homogeneous
coverage for any sort of statistical analysis, and a catalog which
(like this one) is a compendium of catalogs is particularly
ill-suited for that kind of work. Some surveys are done with the
express purpose of obtaining sufficiently homogeneous data to attempt
valid analysis.

My million-quasars catalog is primarily suited as a body of reference
so that sky searchers will know what work has already been done.

cheers,
Eric Flesch

(Eric Flesch) wrote in
:

On Sat, 25 Apr 2009, Bluuuue Rajah Bluuuuue@Rajah. wrote:
(Eric Flesch) wrote in news:49f31f8f.537714
The data is not isotropic because, as a compendium of the
literature, it is entirely dependent on original survey parameters
(i.e., more work has been done in some directions than in others).

And none at all, I suppose, in some regions of the sky. ;(

There is at least cursory coverage in all places except for the Zone
of Avoidance, i.e. plane of the Galaxy. But you require homogeneous
coverage for any sort of statistical analysis, and a catalog which
(like this one) is a compendium of catalogs is particularly
ill-suited for that kind of work. Some surveys are done with the
express purpose of obtaining sufficiently homogeneous data to attempt
valid analysis.

My million-quasars catalog is primarily suited as a body of reference
so that sky searchers will know what work has already been done.

Why waste time building a wonderful tool, if it can't be used for
anything?