PS1 3pi DVO Database Snapshop 2011.04.21

The latest 3pi DVO database release can be found at the following location:

rsync://ipp0032.ifa.hawaii.edu/ps1-3pi-catdirs-20110421

This rsync location is protected with a password, see your DRAVG representative for information

The following plots show the coverage in g,r,i,z,y. These plots are centered on 0,0 (ra increasing to the right). The black line is the Galactic Plane; the purple line is the Ecliptic.

filter 3pi database coverage
g
r
i
z
y

This database is similar in contents to the previous (2011/2/1) database.

Some notes on what this database contains:

  • all1 3pi data taken since the start of demo month (2010/2/12) through the start of April (2011/4/1)
  • 2MASS detections matched to all objects
  • average fields for grizy and JHK (eg, avextract g i J K would work)
  • zero point calibrations for the PS1 data come from the synthetic photometry database.
  • astrometric calibration is the default in-line calibration relative to the 2MASS frame
  • average magnitudes use a weighted mean, and skip detections that have PSF_QF < 0.85 (excessively masked objects). there is no iterative clipping, however.

1 a caveat regarding coverage: there seem to be some gaps that do not correspond to known gaps in the data taken.

In addition, there are 4 bit flags available in the average table for each object to give a hint at quality and extendedness:

  • for all PS1 detections, the detection is considered 'extended' if (mag_psf - mag_ap > 0.5)
  • if the number of 'extended detections' exceeds the number of 'psf-like' detections, the object is flagged as "PS1 extended" (objflag & 0x01000000)
  • if any of the detections have PSF_QF > 0.85, then the object is considered "PS1 good" (objflag & 0x04000000)
  • similarly, if the 2MASS J-band flags indicate the source is extended, the object is considered "2MASS extended" (objflag & 0x02000000)
  • if the 2MASS J-band detection is significant (**), the source is considered "2MASS good" (objflag & 0x08000000)
    • A significant 2MASS source means their field ph_qual is one of the 3 classes A, B, or C, which means the source is > 5 sigma and has some quality limits.

For more information about 2MASS representation in DVO, see 2MASS_info_in_DVO.

Source Counts

region N(objects) N(detections) 2MASS(objects) 2MASS(detections)
n0000 238340242 859053094 22669788 68009364
n0730 229407741 859900656 22234449 66703347
n1500 215053632 892046096 21574758 64724274
n2230 212432167 904611990 20261912 60785736
n3000 204921061 842451839 19573278 58719834
n3730 170950354 711912493 17779643 53338929
n4500 154037392 698112737 17544366 52633098
n5230 130632639 652426073 16378632 49135896
n6000 92593658 461075070 11718975 35156925
n6730 57788695 234148770 5173377 15520131
n7500 34429854 113871350 2214222 6642666
n8230 9348197 27724078 633355 1900065
s0000 249150791 902157224 24458147 73374441
s0730 265693154 1074361638 26321350 78964050
s1500 301040727 1353823003 29795032 89385096
s2230 325386490 1559497237 33108907 99326721
s3000 50808007 162899768 32856544 98569632
s3730 31141331 93423993 31141331 93423993
s4500 33001272 99003816 33001272 99003816
s5230 36304694 108914082 36304694 108914082
s6000 29756694 89270082 29756694 89270082
s6730 11730797 35192391 11730797 35192391
s7500 3734364 11203092 3734364 11203092
s8230 1026468 3079404 1026468 3079404
total 3088710421 12750159976 470992355 1412977065
PS1-only 2617718066 11337182911

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