Identification of the source (14 columns)
- DETID (J)
-
A consecutive number which identifies each entry (detection) in the
catalogue. The DETID numbering assignments in 3XMM-DR5 bear no relation
to those in 2XMMi-DR3 but the DETID of the nearest matching detection
from the 2XMMi-DR3 catalogue to the 3XMM-DR4 detection is provided via
the DR3DETID column.
- SRCID (J)
-
A unique number assigned to a group of catalogue entries which are
assumed to be the same source. The process of grouping detections in to
unique sources has changed since the 2XMM catalogue series and is described in
Section 3.8.
The SRCID assignments in 3XMM-DR5 bear no relation to those
in 2XMMi-DR3 but the nearest unique sources from the 2XMMi-DR3 catalogue
to the 3XMM-DR5 unique source is provided via the
DR3SRCID column.
- DR4SRCID (J)
-
The SRCID, from 3XMM-DR4, of the nearest unique source in that
catalogue that lies within 10 arcsecs of the 3XMM-DR5 unique source
position.
- DR4DETID (J)
-
The DETID, from 3XMM-DR4, of the nearest detection in that
catalogue that lies within 10 arcsecs of the detection
position in 3XMM-DR5.
- DR4DETDIST (E)
-
The distance, in arcsecs, between the 3XMM-DR5 detection position and
the nearest detection (within 10 arcsecs) in the 3XMM-DR4 catalogue.
- DR4SRCDIST (E)
-
The distance, in arcsecs, between the 3XMM-DR5 unique source position
and the nearest unique source (within 10 arcsecs) in the 3XMM-DR4
catalogue.
- DR4MULT (J)
-
The number of unique sources from the 3XMM-DR4 catalogue that lie
within 10 arcsecs of the unique source position in 3XMM-DR5.
- DR3SRCID (J)
-
The SRCID, from 2XMMi-DR3, of the nearest unique source in that
catalogue that lies within 10 arcsecs of the 3XMM-DR5 unique source
position.
- DR3DETID (J)
-
The DETID, from 2XMMi-DR3, of the nearest detection in that
catalogue that lies within 10 arcsecs of the detection
position in 3XMM-DR5.
- DR3DETDIST (E)
-
The distance, in arcsecs, between the 3XMM-DR5 detection position and
the nearest detection (within 10 arcsecs) in the 2XMMi-DR3 catalogue.
- DR3SRCDIST (E)
-
The distance, in arcsecs, between the 3XMM-DR5 unique source position
and the nearest unique source (within 10 arcsecs) in the 2XMMi-DR3
catalogue.
- DR3MULT (J)
-
The number of unique sources from the 2XMMi-DR3 catalogue that lie
within 10 arcsecs of the unique source position in 3XMM-DR5.
- IAUNAME (21A)
-
The IAU name assigned to the unique SRCID (see 3XMM-DR4 UG,
Sec. 3.8.1 ).
-
SRC_NUM (J) SAS task
srcmatch
-
The (decimal) source number in the individual source list for this
observation; when expressed in the hexadecimal system it identifies the
source-specific product files belonging to this detection (2XMM UG Appendix A.1).