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CGMW: Help

CGMW - Candidate Galaxies Behind the Milky Way


Overview

This catalog gathers the searches for galaxies of apparent size greater than 0.1 mm on film (6.7" in angular size) lieing behind the Milky Way from photographic surveys in the near-infrared. The four volumes (CGMW1, CGMW2, CGMW3, and CGMW4) cover the galactic longitude ranges from -7 to +43 degrees, and from 210 to 250 degrees.

The two volumes, CGMW1 and CGMW2, giving about 7000 galaxies behind the Milky Way between l = 210 degrees and 250 degrees, represent a systematic search for galaxies by means of 32 film copies of the UK Schmidt Southern Infrared Atlas on the Milky Way covering about 900 square degrees. In the search galaxies with apparent sizes greater than 0.1mm on film (6.7 arcsec in size) were detected by visual inspection. The material and procedure of search are described as well as the detectability of galaxies in paper I and paper II appended before Vol. 1 and Vol. 2 of the catalog, respectively, which have been published in Publ. Astron. Soc Japan, Vol. 42 (1990) and Vol. 43 (1991). The parameters of catalogued galaxies are also explained in paper I. Cross-identifications with other catalogs are also given.

The third volume CGMW3 lists about 5300 galaxy candidates having sizes larger than 0.1 arcminutes that were found in a search of Schmidt atlases covering a Milky Way region of about 800 square degrees around l = 8 to 43 degrees, and b = -17 to +17 degrees. This surveyed region is located between the northern Local void and the Ophiuchus void. The fourth volume CGMW4 lists about 7150 galaxies and galaxy candidates having sizes larger than 0.1 arcminutes that were found in a search of Schmidt atlases covering a Milky Way region of about 260 square degrees around l = -7 to +16 degrees, and b = -19 to -1 degrees, i.e., a field in Sagittarius in the Galactic Center region.


Catalog Bibcode

1990PASJ...42..603S

References

CGMW1:   A search for galaxies behind the Milky Way between l=210 degrees
and 230 degrees. (Vol. 1)
    Saito M., Ohtani H., Asonuma A., Kashikawa N., Maki T., Nishida S.,
    Watanabe T.
   (Publ. Astron. Soc. Japan, Vol. 42, 603 (1990))
   =1990PASJ...42..603S
CGMW2:   Catalog of Galaxies Behind the Milky Way, l=230 to 250 degrees.
(Vol. 2)
    Saito M., Ohtani H., Baba A., Hotta N., Kameno S., Kurosu S.,
    Nakada K., Takata T.
   (Publ. Astron. Soc. Japan, Vol. 43, 449 (1991))
   =1991PASJ...43..449S
CGMW3:   A search for galaxies behind the Milky Way at Aquila and Sagittarius.
(Vol. 3)
    Roman A.T., Nakanishi K., Tomita A., Saito M.
   (Publ. Astron. Soc. Jap., 48, 679 (1996)
   =1996PASJ...48..679R
CGMW4:   A systematic search for galaxies behind the Milky Way at Sagittarius.
(Vol. 4)
    Roman A.T., Nakanishi K., Saito M.
   (Publ. Astron. Soc. Jap., 50, 37-46 (1998))
   =1998PASJ...50...37R

Provenance

This database was created by the HEASARC in October 1999 based on a machine-readable version that was obtained from the CDS Data Center.

Parameters

Volume
Volume number: 1 for CGMW1, 2 for CGMW2, 3 for CGMW3 and 4 for CGMW4.

Cgmw
The running number of the galaxy within the particular volume. Notice that for CGMW1, CGMW2 and CGMW3 this number is in order of increasing right ascension in 1950 equinox, whereas in CGMW4 this number is in order of increasing right ascension in 2000 equinox.

Name
The IAU designation for a CGMW object constructed by the HEASARC by concatenating 'CGMW', the volume number (volume), '-', and the running number (cgmw).

Field_Number
The field number of the ESO/SERC Southern Sky Survey: this only applies to CGMW1 and CGMW2 galaxies.

Xpos
The x coordinate on the film in millimeters (mm). The origin is at the center of the field, which is determined by four crosses on the film; the positive direction is eastward in x. This parameter only applies to CGMW1 and CGMW2 galaxies.

Ypos
The y coordinate on the film in millimeters (mm). The origin is at the center of the field, which is determined by four crosses on the film; the positive direction is northward in y. This parameter only applies to CGMW1 and CGMW2 galaxies.

RA
The Right Ascension in the specified equinox. The original data were provided in B1950 equinox except for CGMW4 where they were in J2000 equinox. For CGMW1 and CGMW2 the input RA was specified to the nearest second, whereas for CGMW3 and CGMW4 the input RA was specified to the nearest 0.1 seconds.

Dec
The Declination in the specified equinox. The original data were provided in B1950 equinox except for CGMW4 where they were in J2000 equinox. For CGMW1, CGMW2, and CGMW3 the input declination was specified to the 0.1 arcminutes, whereas for CGMW4 the input declination was specified to the nearest arcsecond.

LII
Galactic longitude.

BII
Galactic latitude.

Major_Diam
The size of the apparent major diameter in millimeters (mm) on the film, where 1 mm = 67 arcseconds. The scale was graded to 0.1 mm (6.7").

Minor_Diam
The size of the apparent minor diameter in millimeters (mm) on the film, where 1 mm = 67 arcseconds. The scale was graded to 0.1 mm (6.7"). The value of 0.1 mm for the minor diameter represents an upper limit for most of the objects with small major diameters.

Morph_Type
The morphological type class: S for spirals, SB for barred spirals, E for ellipticals, and I for irregulars, for galaxies with major diameters greater than 0.2 mm (13 arcsec). If the authors could not distinguish between two classes, these two classes are given. If the authors could not determine any class for a galaxy with major diameter greater than 0.2 mm (13"), a value of '?' is given. This information is only given for CGMW1 and CGMW2 galaxies.

Feature
This describes various features of the CGMW galaxy: two different schemes are used, one for CGMW1 and CGMW2 objects, the second for CGMW3 and CGMW4 onjects.

CGMW1 and CGMW2: 'Bright' and 'Faint' describe the surface brightness, 'Asymm' (for asymmetry) and 'Ring' describe morphological features, 'Pair' and 'Triple' indicate that there exist close companion galaxies (if accompanying galaxies are nearly in the same position, they are not listed separately in this catalog, notice), and 'PN+Galaxy' indicates that a foreground planetary nebula overlaps the galaxy image.

CGMW3 and CGMW4: 'LSB' (low surface brightness) and 'Bright' describe the surface brightness; 'S' (spiral), 'E' (elliptical), 'Pec' (peculiar), and 'ND' (nuclear dominant) describe the morphology; 'Pair' and 'Triplet' describe the multiplicity and indicate that there exist close (within a few arcminutes) companion galaxies (if accompanying galaxies are nearly in the same position, they are not listed separately in this catalog, notice); 'Near Star' and 'With Star' indicates that the CGMW object is close to or on top of a star; 'Star:' indicates that the CGMW object is possibly a star (i.e., the image has a ring shape or a faint extended component around a bright star-like object), and the colon means a possible feature; and 'PN:' indicates that the CGMW object is possibly a planetary nebula (i.e., the image is rather round and the surface brightness distribution seems to be homogeneous or the outer edge of the image is relatively sharp compared with that of a galaxy).

Cross_ID
Cross identifications for objects in other catalogs of galaxies, radio sources, and IRAS point sources.

Plate
The name of the Schmidt Atlas and field number on which the object was detected. This information is only given for CGMW3 and CGMW4 galaxies.

Ref_Survey
The name of the reference survey of the overlapping plate on which the object was also seen. The reference surveys POSS I-O, UK-SR, SERC-EJ, and ESO/SRC-R are indicated as O, SR, EJ, and R, respectively. This information is only given for CGMW3 and CGMW4 galaxies.

Over1_Field
The field number of the overlapping plate on which the object was also seen. This information is only given for CGMW3 and CGMW4 galaxies.

Over2_Field
The field number of the second overlapping plate (if it exists) on which the object was seen. This information is only given for CGMW4 galaxies.

Class
The Browse classification of the source: all objects in this catalog have been given the class of 'galaxy', but users should examine the morph_type and feature parameter values, as these have additional relevant information, including a small number of objects that may be foreground stars or planetary nebulae rather than background galaxies.


Contact Person

Questions regarding the CGMW database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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