2009ApJ...697..207W

Query : 2009ApJ...697..207W

2009ApJ...697..207W - Astrophys. J., 697, 207-223 (2009/May-3)

An orbit fit for the Grillmair Dionatos cold stellar stream.

WILLETT B.A., NEWBERG H.J., ZHANG H., YANNY B. and BEERS T.C.

Abstract (from CDS):

We use velocity and metallicity information from Sloan Digital Sky Survey and Sloan Extension for Galactic Understanding and Exploration stellar spectroscopy to fit an orbit to the narrow 63° stellar stream of Grillmair and Dionatos. The stars in the stream have a retrograde orbit with eccentricity e = 0.33 (perigalacticon of 14.4 kpc and apogalacticon of 28.7 kpc) and inclination approximately i ∼ 35°. In the region of the orbit which is detected, it has a distance of about 7-11 kpc from the Sun. Assuming a standard disk plus bulge and logarithmic halo potential for the Milky Way stars plus dark matter, the stream stars are moving with a large space velocity of approximately 276 km/s at perigalacticon. Using this stream alone, we are unable to determine if the dark matter halo is oblate or prolate. The metallicity of the stream is [Fe/H] = -2.1±0.1. Observed proper motions for individual stream members above the main sequence turnoff are consistent with the derived orbit. None of the known globular clusters in the Milky Way have positions, radial velocities, and metallicities that are consistent with being the progenitor of the GD-1 stream.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: kinematics and dynamics - Galaxy: structure

VizieR on-line data: <Available at CDS (J/ApJ/697/207): table2.dat>

Simbad objects: 62

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Number of rows : 62
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
2 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
3 SDSS J082244.13-002622.4 * 08 22 44.1311864064 -00 26 22.426508184           A0 1 0
4 SDSS J082618.51-002621.7 * 08 26 18.5166932712 -00 26 21.842019780           A0 3 0
5 2MASS J08263491-0020252 * 08 26 34.8997131024 -00 20 25.713760020           A0 5 0
6 SDSS J084537.67+094613.4 * 08 45 37.6764306768 +09 46 13.561995828           A0 4 0
7 SDSS J084837.88+110809.0 * 08 48 37.8832691136 +11 08 09.080364876           F5 3 0
8 Cl* NGC 2682 FBC 820 * 08 49 28.2404849736 +11 19 31.860481476           F5 6 0
9 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
10 Cl* NGC 2682 SAND 1650 RG* 08 52 17.6162039760 +12 16 00.906544884     15.937     F5 9 0
11 SDSS J091335.97+222446.8 * 09 13 35.9709604800 +22 24 46.936477908           B6 6 0
12 2MASS J09134819+2226046 * 09 13 48.1847516856 +22 26 04.501682880           F3/F5V 5 0
13 SDSS J091440.65+223335.0 * 09 14 40.6582274280 +22 33 35.072988084           F5 3 0
14 2MASS J09310909+2927403 * 09 31 09.0794635968 +29 27 40.000155048           F5 6 0
15 SDSS J093154.91+290810.6 * 09 31 54.9092828856 +29 08 10.756032108           A0 5 0
16 2MASS J09332151+2937132 * 09 33 21.4872011328 +29 37 13.420758504           A0 5 0
17 2MASS J09334182+2902117 * 09 33 41.7800002344 +29 02 11.221867932           F2V 5 0
18 2MASS J09334876+2907140 HB* 09 33 48.7655061408 +29 07 14.296762776     15.15     sdA 9 0
19 2MASS J09341274+2928394 * 09 34 12.7079552904 +29 28 39.118199196           F3/F5V 5 0
20 Ton 436 HB* 09 34 23.4820060776 +29 48 09.782929656   14.5       sdA 9 0
21 SDSS J093452.54+295226.7 * 09 34 52.5537017376 +29 52 26.837952708           A0 5 0
22 SDSS J093625.76+304416.5 * 09 36 25.7647726368 +30 44 16.535103360           A0 5 0
23 SDSS J093629.02+305651.7 * 09 36 29.0292045240 +30 56 51.837174384           A0 5 0
24 SDSS J093706.17+301649.6 * 09 37 06.1809780336 +30 16 49.772350344           A0 4 0
25 SDSS J093756.93+302437.4 * 09 37 56.9412855312 +30 24 37.444788864           A0 6 0
26 SDSS J093814.81+305806.1 * 09 38 14.8150351824 +30 58 06.130088004           F5 5 0
27 SDSS J102843.56+443051.6 * 10 28 43.5709610640 +44 30 51.716166336           A0 6 0
28 SDSS J103015.79+433835.9 * 10 30 15.7949951904 +43 38 35.996483220           A0 7 0
29 SDSS J103046.02+434751.8 * 10 30 46.0267867368 +43 47 51.951543144           A0 5 0
30 SDSS J103116.16+435523.9 * 10 31 16.1621790720 +43 55 23.985543360           F5 3 0
31 SDSS J103133.49+433001.0 * 10 31 33.4917417456 +43 30 01.034090172           A0 1 0
32 SDSS J103212.31+433838.5 * 10 32 12.3149083680 +43 38 38.543771436           A0 6 0
33 SDSS J103233.03+440510.7 * 10 32 33.0345385464 +44 05 10.716894420           A0 4 0
34 SDSS J103344.89+442759.0 * 10 33 44.8989238992 +44 27 59.029264116           A0 5 0
35 SDSS J103448.15+443149.3 * 10 34 48.1515819720 +44 31 49.475478648           A0 6 0
36 2MASS J10345934+4441124 * 10 34 59.3404086600 +44 41 12.410554848           F5 7 0
37 SDSS J104929.16+471227.4 * 10 49 29.1641557680 +47 12 27.516784320           A0 7 0
38 SDSS J104948.38+480009.7 * 10 49 48.3908804856 +48 00 09.705035628           F5 1 0
39 SDSS J105011.33+465927.3 * 10 50 11.3408798520 +46 59 27.382652880           F0IV 5 0
40 ATO J162.5577+47.2510 dS* 10 50 13.8628122912 +47 15 03.974355468           sdA 7 0
41 SDSS J105058.50+485414.3 * 10 50 58.4996449680 +48 54 14.317453296           A0 1 0
42 SDSS J105511.81+474848.9 * 10 55 11.8122414120 +47 48 48.891172284           A0 5 0
43 SDSS J105615.37+490202.5 * 10 56 15.3747788280 +49 02 02.515864308           A0 2 0
44 SDSS J105720.27+482822.2 * 10 57 20.2652237928 +48 28 22.281353544           A0 1 0
45 SDSS J105729.12+481328.1 * 10 57 29.1242524800 +48 13 28.165745244           A0 6 0
46 2MASS J10582809+4912096 * 10 58 28.0769991048 +49 12 09.737707572           F5 2 0
47 2MASS J11004783+4840091 * 11 00 47.8733853240 +48 40 09.381740268           F5 6 0
48 SDSS J110131.61+484015.7 * 11 01 31.6126281840 +48 40 15.824739756           A0 2 0
49 SDSS J142943.21+590404.0 HB* 14 29 43.2180262368 +59 04 03.934980480           A0 5 0
50 2MASS J14384358+5753500 * 14 38 43.5886810896 +57 53 50.311935204           F0IV 1 0
51 2MASS J14393568+5815298 HB* 14 39 35.6385790416 +58 15 30.063485988           A0 6 0
52 Z 251-4 AG? 16 16 17.9000468088 +47 02 43.128874644   14.9       ~ 151 0
53 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
54 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
55 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
56 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
57 NGC 6749 OpC 19 05 15.36 +01 54 00.0     12.4     ~ 178 0
58 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
59 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
60 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
61 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
62 NAME GD-1 Stream St* 22 40 +31.           ~ 319 0

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