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VII/214 APS Galaxies in the North Galactic Pole (Cabanela, 1999)
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Galaxy properties from a diameter-limited catalog
Cabanela J.E.
<Ph.D. Thesis, University of Minnesota (1999)>
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ADC_Keywords: Galaxy catalogs ; Photometry ; Photometry, surface ; Surveys
Description:
This catalog contains information for 217768 unique objects (all plate
overlap duplicates have been eliminated) with major-axis diameters
greater than 10 arcseconds in O (blue) and identified as "non-stellar"
by the APS. Care has been taken to remove known sources of
non-extragalactic contamination including SAO star halos, POSS I ghost
images of bright stars, low surface brightness material around bright
galaxies, and Galactic globular clusters.
This version of the MAPS-NGP galaxy catalog preserves the full
resolution of data as stored in the Revised Minnesota Automated Plate
Scanner Catalog of the POSS I (a.k.a. StarBase2). For more through
documentation of how these image parameters are obtained, you may
visit the APS WWW site <http://aps.umn.edu/> or look at some of the
references listed at the end of this README file.
Abstract:
(of PhD Thesis, from Minessota)
I am using the Minnesota Automated Plate Scanner (APS) to construct
two galaxy catalogs. The Minnesota Automated Plate Scanner
Pisces-Perseus Survey (MAPS-PP) is used to search for modern-day
remnant signatures of large-scale structure formation processes,
specifically, galaxy alignments relative to surrounding large-scale
structure. Weak evidence for such alignments is found, although the
type of alignments seen don't strongly support any one large-scale
structure formation model.
Comparison of the MAPS-PP to pre-existing galaxy catalogs has led to
the discovery that the Uppsala General Catalog and Third Reference
Catalog of Galaxies exhibit a very strong measurement bias: their
diameters are measured to different isophotes at different galaxy
inclinations. Therefore previous determinations of the diameter
function and the internal extinction properties of other galaxies
(most of which have relied on one of these two galaxy catalogs) have
suffered from a biased diameter measurement.
I avoid this bias by using the APS data (which is obtained using
automated computer-based criteria for measuring the structural
properties of images digitized from photographic plates) to construct
a catalog of over 200,000 galaxies within 30 degrees of the North
Galactic Pole (the MAPS-NGP). The MAPS-NGP is the deepest galaxy
catalog constructed over such a large area of the sky and used to
re-evaluate previous investigations of the internal extinction in
galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aps.dat 310 217768 The MAPSNGP Catalogue
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See also:
http://aps.umn.edu/ : APS home page
VII/204 : Galaxy properties at NGP (Odewahn+ 1995)
J/ApJ/473/822 : APS Catalog of Galaxies behind Virgo (Hoffman+ 1996)
J/AJ/87/1165 : Reddening Maps from HI and Galaxy Counts (Burstein+ 1982)
J/AJ/116/1094 : MAPS-PP catalog of galaxies (Cabanela+, 1998)
Nomenclature Note:
The objects are suggested to be named
APS Oxxxx NNNN where xxxx is the POSS plate number, and NNNN the Oname
or
APS Exxxx NNNN where xxxx is the POSS plate number, and NNNN the Ename
Byte-by-byte Description of file: aps.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- MLN [96/619] Modified Luyten number for field
6- 9 I4 --- POSS [41/1611] Original POSS field number (1)
11- 17 I7 --- Oname O image raster number (unique number for
each object on a given plate) (1)
19- 24 I6 pix OXcen X position of image centroid from
O plate corner
26- 31 I6 pix OYcen Y position of image centroid from
O plate corner
33- 34 I2 h RAh Right ascension (1950) for O plate
35 A1 --- --- [:]
36- 37 I2 min RAm Right ascension (1950) for O plate
38 A1 --- --- [:]
39- 43 F5.2 s RAs Right ascension (1950) for O plate
45 A1 --- DE- Declination sign (1950) for O plate
46- 47 I2 deg DEd Declination (1950) for O plate
48 A1 --- --- [:]
49- 50 I2 arcmin DEm Declination (1950) for O plate
51 A1 --- --- [:]
52- 56 F5.2 arcsec DEs Declination (1950) for O plate
58- 63 F6.2 arcsec Odiam Major-axis diameter from the O plate image
65- 69 F5.2 mag Omagi Integrated magnitude from the O plate image
71- 75 F5.2 mag Omagd Magnitude from the O plate image using D-M
relation for stars
77- 82 F6.2 deg Opa Major-axis position angle (N to E)
from the O plate image
84- 87 F4.2 --- Oell Ellipticity from the O plate image
89- 92 F4.2 --- Ogal [0,1] Galnode value for O plate (2)
94- 98 F5.2 --- Omom2 Second Moment of the O plate image
100-104 F5.2 % Osat Percent saturation of the O plate image
106-112 F7.2 --- Otrans Average transmittance of the O plate image
114-118 F5.2 mag/arcsec+2 OSuBr Mean surface brightness from O plate image
120-124 F5.2 arcsec OReff Effective (half-light) radius from O plate
126-130 F5.3 --- OC31 C31 blue concentration index. Ratio of the
100% light radius to 50% light radius
132-136 F5.3 --- OC32 C32 blue concentration index. Ratio of the
100% light radius to 75% light radius
138-142 F5.3 --- OC21 C21 blue concentration index. Ratio of the
75% light radius to 50% light radius
144-150 I7 --- Ename E image raster number (1)
152-157 I6 pix EXcen X position of image centroid from
E plate corner
159-164 I6 pix EYcen Y position of image centroid from
E plate corner
166-167 I2 h RA(E)h Right ascension (1950) from E plate
168 A1 --- --- [:]
169-170 I2 min RA(E)m Right ascension (1950) from E plate
171 A1 --- --- [:]
172-176 F5.2 s RA(E)s Right ascension (1950) from E plate
178 A1 --- DE(E)- Declination sign (1950) from E plate
179-180 I2 deg DE(E)d Declination (1950) from E plate
181 A1 --- --- [:]
182-183 I2 arcmin DE(E)m Declination (1950) from E plate
184 A1 --- --- [:]
185-189 F5.2 arcsec DE(E)s Declination (1950) from E plate
191-196 F6.2 arcsec Ediam Major-axis diameter from the E plate image
198-202 F5.2 mag Emagi Integrated magnitude from the E plate image
204-208 F5.2 mag Emagd Magnitude from the E plate image using D-M
relation for stars
210-215 F6.2 deg Epa Major-axis position angle (N to E)
from the E plate image
217-220 F4.2 --- Eell Ellipticity from the E plate image
222-225 F4.2 --- Egal [0,1] Galnode value from E plate (2)
227-231 F5.2 --- Emom2 Second Moment of the E plate image
233-237 F5.2 % Esat Percent saturation of the E plate image
239-245 F7.2 --- Etrans Average transmittance of the E plate image
247-251 F5.2 mag/arcsec+2 ESuBr Mean surface brightness from E plate image
253-257 F5.2 arcsec EReff Effective (half-light) radius from E plat
259-263 F5.3 --- EC31 C31 red concentration index. Ratio of the
100% light radius to 50% light radius
265-269 F5.3 --- EC32 C32 red concentration index. Ratio of the
100% light radius to 75% light radius
271-275 F5.3 --- EC21 C21 red concentration index. Ratio of the
75% light radius to 50% light radius
277-281 F5.3 mag E(B-V)B E(B-V) determined by bilinear interpolation
of Burstein & Heiles extinction estimates
(1982, see Cat. <J/AJ/87/1165>)
283-287 F5.3 mag E(B-V)S E(B-V) determined from Schlegel et al.
(1998ApJ...500..525S) extinction estimates
289 I1 --- fO [0/6] O image flag (3)
290 I1 --- fE [0/6] E image flag (3)
292-296 F5.2 mag O-E O-E color of the object computed using
integrated magnitudes.
298-302 F5.2 mag O-Ed O-E color of the object computed using
D-M relation magnitudes.
304-310 F7.2 deg-2 Dens Estimated local surface density of MAPS-NGP
galaxies (in galaxies/degree^2^)
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Note (1): part of the suggested name
(see the "Nomenclature Note" section above)
Note (2): the "galnode" value represents the certainty with which
the artificial neural network classifier has classed this object as
"non-stellar" on O or E plate image
Note (3): Use of any image with a non-zero flag may be suspect
in certain situations.
1: bad fuz value
2: bad jitter value
3: bad SASORT ellipticity (note: ellipticities are recomputed
during data reduction, so this flag is somewhat unimportant)
4: image crosses stripe boundary, likely to be clipped
(inaccurate image parameters likely)
6: computed sky density is negative
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History: Copied by ftp at aps.umn.edu /pub/juan/MAPSNGP
Acknowledgements:
Dr. Juan Cabanela <juan@lua.stcloudstate.edu>
References:
Burstein & Heiles 1982, Cat. <J/AJ/87/1165>
Cabanela 1999, Ph.D. Thesis,
University of Minnesota
Cabanela & Aldering, 1998, Cat. <J/AJ/116/1094>
Cabanela & Dickey, 1999AJ....118...46C
Pennington, Humphreys, Odewahn, Zumach & Thurmes 1993PASP..105..521P
Odewahn, Humphreys, Aldering & Thurmes 1993PASP..105.1354O
Odewahn, Stockwell, Pennington, Humphreys & Zumach 1992AJ....103..318O
Odewahn & Aldering 1995, Cat. <VII/204>
[NOTE: Odewahn & Aldering 1995 provide an incorrect definition for APS
concentration indices, the correct definitions are those provided
in this README document.]
Schlegel, Finkbeiner & Davis 1998ApJ...500..525S
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(End) Francois Ochsenbein [CDS] 26-Jul-2000