Structure of the Draco Dwarf Spheroidal Galaxy

41 Pages·4.6 MB·English

by  Slawomir Piatek

Table 1.
Information about fields
T (s) FWHM(pixels)
exp
R.A. Decl. l b
Field Date (J2000.0) (J2000.0) (deg) (deg) V R V
2
0 (1) (2) (3) (4) (5) (6) (7) (8) (9)
0
2
N1............. 1992 May 28 17 20 01.18 58 17 12.52 86.8208 34.7227 3 1700 4 2000 2.40 0.

n × × ±
N1(tie)...... 1992 Jun 2 17 20 01.30 58 06 00.52 86.5942 34.7345 1 100 1 100
a
× × ···
J S1............. 1992 May 30 17 20 01.65 57 31 42.52 85.8996 34.7683 3 1700 3 1600 2.18 0.
× × ±
7 S1(tie)...... 1992 Jun 2 17 20 01.54 57 43 09.52 86.1315 34.7575 1 100 1 100
1 × × ···

1 Note.—Units of right ascension are hours, minutes, and seconds, and units of declination are degrees,
v
arcseconds.
7
9
2
1
0
2
0
/
h
p
-
o
r
t
s
a
:
v
i
X
r
a

2
0
0
2

n
a
J

7
1
Table 2.(A) R and V Photometry of Draco: N1 field.a

1
v
7
X Y R.A. Decl.
9
2Star (pix) (pix) (J2000.0) (J2000.0) R σR V σV CHI SHARP
1(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
0
2
1 992.939 3.848 17 19 59.94 58 29 28.68 18.7966 0.0130 20.1291 0.2470 2.4500 -0.1885
0
/2 2021.190 4.042 17 21 30.29 58 29 34.74 22.8216 0.1420 24.6568 1.3110 0.8000 -0.2050
h
p3 1826.177 4.789 17 21 13.16 58 29 33.35 24.7650 1.1390 23.1011 0.1690 0.6000 0.8010
-4 461.167 5.034 17 19 13.23 58 29 23.11 24.2232 1.0220 23.7379 0.3310 0.8350 4.9850
o
r5 828.858 5.066 17 19 45.53 58 29 26.49 23.1941 0.2410 23.0870 0.1550 0.5700 -0.4865
t
s
aa
:Tables 2A and 2B are presented in their entirety in the electronic edition of the Astronomical Journal. A portion is
v
shown here for guidance regarding their form and content.
i
X
r
a

Table 3.
Radial Surface
2 Density Profile
0
0
2
Semi-major axis Surface Density

n (arcmin) (arcmin−2)
a
J

7 1.514 27.47 1.64
1 ±
3.357 23.63 0.96
±
1 5.307 19.03 0.70
±
v 7.254 14.02 0.50
7 ±
9 9.290 10.19 0.38
±
2 11.31 7.309 0.285
1 ±
13.23 4.863 0.218
0
±
2 15.23 3.398 0.182
0 ±
17.26 2.807 0.151
/
h ±
19.30 2.530 0.131
p ±
- 21.33 2.024 0.113
o ±
23.30 1.971 0.109
r
t ±
s 25.27 1.866 0.104
a ±
27.32 1.627 0.096
:
v ±
29.28 1.580 0.094
i
X ±
31.30 1.676 0.096
r ±
a 33.26 1.496 0.093
±
35.30 1.500 0.099
±
37.21 1.383 0.099
±
39.35 1.301 0.107
±
42.17 1.267 0.080
±
46.08 1.195 0.082
±