2019MNRAS.486.2995M

Query : 2019MNRAS.486.2995M

2019MNRAS.486.2995M - Mon. Not. R. Astron. Soc., 486, 2995-3005 (2019/July-1)

Constraining the Milky Way halo potential with the GD-1 stellar stream.

MALHAN K. and IBATA R.A.

Abstract (from CDS):

We use ESA/Gaia astrometry together with SEGUE and LAMOST measurements of the GD-1 stellar stream to explore the improvement on the Galactic gravitational potential that these new data provide. Assuming a realistic universal model for the dark matter halo together with reasonable models of the baryonic components, we find that the orbital solutions for GD-1 require the circular velocity at the Solar radius to be V_ circ_( R☉)=244±_4 km s–1, and also that the density flattening of the dark halo is qρ=0.82+0.25–0.13. The corresponding Galactic mass within 20 kpc was estimated to be M_ MW_(< 20 kpc)=2.5±0.2 ×1011 M☉_. Moreover, Gaia's excellent proper motions also allowed us to constrain the velocity dispersion of the GD-1 stream in the direction tangential to the line of sight to be < 2.30 km s–1 (95 per cent confidence limit), confirming the extremely cold dynamical nature of this system.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: kinematics and dynamics - Galaxy: fundamental parameters - Galaxy: halo - Galaxy: structure - dark matter

VizieR on-line data: <Available at CDS (J/MNRAS/486/2995): table2.dat>

Simbad objects: 100

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Number of rows : 100
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 SDSS J091335.97+222446.8 * 09 13 35.9709604800 +22 24 46.936477908           B6 6 0
3 2MASS J09134819+2226046 * 09 13 48.1847516856 +22 26 04.501682880           F3/F5V 5 0
4 SDSS J091440.35+222854.2 * 09 14 40.3630555968 +22 28 54.322729284           A0 3 0
5 Gaia DR3 638728161664444416 * 09 14 45.1304580528 +22 09 14.035483368           ~ 2 0
6 Gaia DR3 694523463332263552 * 09 24 26.8866604296 +27 33 06.680019852           ~ 2 0
7 UCAC4 597-045247 * 09 26 36.9250300800 +29 21 02.971978956   14.071 13.192 12.973   ~ 2 0
8 SDSS J092735.73+274110.1 * 09 27 35.7278861928 +27 41 10.191657300           A0 5 0
9 Gaia DR3 694353756288124288 * 09 28 36.0474884904 +27 20 16.289624904           ~ 3 0
10 2MASS J09310909+2927403 * 09 31 09.0794635968 +29 27 40.000155048           F5 6 0
11 SDSS J093117.20+293701.3 * 09 31 17.2046469888 +29 37 01.330183416           A0 4 0
12 Gaia DR3 697140331069881728 * 09 31 44.4248253720 +30 11 38.087632284           ~ 2 0
13 SDSS J093154.91+290810.6 * 09 31 54.9092828856 +29 08 10.756032108           A0 5 0
14 UCAC4 594-044870 Pe* 09 32 42.2982029952 +28 41 03.190889976   15.539 14.704 14.620   ~ 8 0
15 SDSS J093313.10+293919.2 * 09 33 13.1059158408 +29 39 19.179686988           A0 3 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 J09341274+2928394 * 09 34 12.7079552904 +29 28 39.118199196           F3/F5V 5 0
19 SDSS J093629.02+305651.7 * 09 36 29.0292045240 +30 56 51.837174384           A0 5 0
20 SDSS J093706.17+301649.6 * 09 37 06.1809780336 +30 16 49.772350344           A0 4 0
21 SDSS J093751.83+310941.1 * 09 37 51.8480057328 +31 09 41.169194352           A0 4 0
22 SDSS J093756.93+302437.4 * 09 37 56.9412855312 +30 24 37.444788864           A0 6 0
23 SDSS J093836.09+312031.5 * 09 38 36.0935592936 +31 20 31.517147220           A0 4 0
24 SDSS J094242.37+322148.1 Pe* 09 42 42.3694360872 +32 21 48.222585540           ~ 6 0
25 SDSS J094426.11+324830.8 Pe* 09 44 26.1089283144 +32 48 30.888992700           ~ 5 0
26 Gaia DR3 796495470228472064 * 09 52 06.5167963008 +36 29 29.177422116           ~ 1 0
27 Gaia DR3 797130713071408896 * 09 56 43.8793932336 +38 26 46.318585560           ~ 2 0
28 2MASS J10045983+3759567 * 10 04 59.8344664560 +37 59 56.559597540           F5 5 0
29 Gaia DR3 803361336230087936 * 10 07 20.0312722752 +39 16 11.958598848           ~ 2 0
30 2MASS J10101995+3945161 * 10 10 19.9556367912 +39 45 16.307895240           F5 5 0
31 Gaia DR3 805361927697166976 * 10 11 52.4351906688 +41 53 39.172396128           ~ 2 0
32 Gaia DR3 805446521373423616 * 10 12 49.4831653608 +42 01 22.911766536           ~ 2 0
33 Gaia DR3 805513969539318656 * 10 13 07.9988023800 +42 24 48.784098816           ~ 3 0
34 Gaia DR3 805248373061210880 * 10 13 43.5323130936 +41 42 04.963532184           ~ 2 0
35 Gaia DR3 805478755105484800 * 10 16 05.8121735544 +42 24 26.373518820           ~ 1 0
36 Gaia DR3 805488886930945792 * 10 16 53.2870430376 +42 40 26.891344596           ~ 2 0
37 SDSS J101933.76+413023.9 * 10 19 33.7746342312 +41 30 23.982685164           A0 4 0
38 SDSS J101951.76+412701.5 * 10 19 51.7716922728 +41 27 01.627965000           A0 6 0
39 Gaia DR3 805927493288911232 * 10 20 40.9012664784 +43 36 23.247089568           ~ 2 0
40 Gaia DR3 805618423144342400 * 10 21 06.5464949232 +42 21 45.098618796           ~ 1 0
41 PB 177 * 10 22 04.8547163208 +42 01 38.803134036           F5 6 0
42 Gaia DR3 805846060709842432 * 10 24 15.5116369728 +43 42 43.283331360           ~ 1 0
43 SDSS J102435.01+422928.5 * 10 24 35.0158559856 +42 29 28.558433796           A0 4 0
44 SDSS J102506.67+423123.9 * 10 25 06.6739005768 +42 31 23.939968260           ~ 5 0
45 SDSS J102552.85+432408.1 * 10 25 52.8600900600 +43 24 08.207370756           A0 4 0
46 SDSS J102843.56+443051.6 * 10 28 43.5709610640 +44 30 51.716166336           A0 6 0
47 SDSS J103011.87+433423.0 * 10 30 11.8753619664 +43 34 23.049236964           A0 5 0
48 SDSS J103015.79+433835.9 * 10 30 15.7949951904 +43 38 35.996483220           A0 7 0
49 SDSS J103037.44+434751.3 * 10 30 37.4500044984 +43 47 51.425112012           A0 5 0
50 SDSS J103212.31+433838.5 * 10 32 12.3149083680 +43 38 38.543771436           A0 6 0
51 SDSS J103310.70+440245.5 * 10 33 10.7100500376 +44 02 45.557252520           A0 4 0
52 Gaia DR3 829185080496114048 * 10 33 32.1840226368 +44 25 48.335723184           ~ 2 0
53 SDSS J103344.89+442759.0 * 10 33 44.8989238992 +44 27 59.029264116           A0 5 0
54 SDSS J103351.80+442702.8 * 10 33 51.8112209976 +44 27 02.896992936           A0 3 0
55 SDSS J103429.38+442538.1 * 10 34 29.3825196912 +44 25 38.247376620           A0 5 0
56 SDSS J103448.15+443149.3 * 10 34 48.1515819720 +44 31 49.475478648           A0 6 0
57 2MASS J10345934+4441124 * 10 34 59.3404086600 +44 41 12.410554848           F5 7 0
58 Gaia DR3 829205627619756160 * 10 36 07.0456154760 +44 38 07.676481480           ~ 3 0
59 Gaia DR3 830353105441826304 * 10 36 11.8232804640 +45 08 15.032486760           ~ 3 0
60 SDSS J103703.34+444547.5 * 10 37 03.3452142432 +44 45 47.620933956           A0 5 0
61 UCAC4 679-051944 Pe* 10 40 05.9445226320 +45 40 33.869504676   16.796 16.251     F5 6 0
62 Gaia DR3 830497691221569920 * 10 40 25.8251025120 +45 58 44.710936284           ~ 2 0
63 Gaia DR3 829661650067166464 * 10 43 26.8107744312 +45 24 16.580249388           ~ 2 0
64 UCAC4 686-052817 * 10 48 12.6828831984 +47 08 43.526771628   15.506   14.651   F5 8 0
65 Gaia DR3 832533299560731520 * 10 49 12.7867353912 +48 37 02.993196216           ~ 1 0
66 SDSS J104929.16+471227.4 * 10 49 29.1641557680 +47 12 27.516784320           A0 7 0
67 SDSS J105011.33+465927.3 * 10 50 11.3408798520 +46 59 27.382652880           F0IV 5 0
68 SDSS J105110.83+470621.8 * 10 51 10.8449858376 +47 06 21.825197532           A0 4 0
69 SDSS J105238.19+482910.8 * 10 52 38.1946122480 +48 29 10.837013712           A0 4 0
70 Gaia DR3 831149598537057280 * 10 52 44.6732104560 +46 36 47.143422360           ~ 2 0
71 SDSS J105256.72+472347.9 * 10 52 56.7267576912 +47 23 47.957465868           A0 3 0
72 SDSS J105346.87+485610.2 * 10 53 46.8684817704 +48 56 10.283457012           A0 3 0
73 SDSS J105435.68+483051.8 * 10 54 35.6814604080 +48 30 51.821650080           A0 3 0
74 SDSS J105450.89+482001.7 * 10 54 50.9040048480 +48 20 01.745014308           A0 5 0
75 SDSS J105516.29+475049.0 * 10 55 16.2931078992 +47 50 49.048774476           A0 5 0
76 Gaia DR3 832684417985839872 * 10 57 07.7728572000 +48 50 59.027896716           ~ 1 0
77 SDSS J105729.12+481328.1 * 10 57 29.1242524800 +48 13 28.165745244           A0 6 0
78 2MASS J11004783+4840091 * 11 00 47.8733853240 +48 40 09.381740268           F5 6 0
79 Gaia DR3 831917882287407360 * 11 02 27.3636067536 +48 27 05.910478632           ~ 1 0
80 Gaia DR3 838527600733576064 * 11 20 55.3798815744 +50 50 37.000068144           ~ 2 0
81 Gaia DR3 840580251503671424 * 11 46 22.2254031936 +53 40 28.254090216           ~ 2 0
82 2MASS J11585826+5453162 * 11 58 58.2473762256 +54 53 16.451275812           F5 4 0
83 Gaia DR3 1549202095307493376 * 12 00 18.9085382592 +53 50 26.435504220           ~ 1 0
84 Gaia DR3 1573678495451576064 * 12 08 31.1706144720 +55 48 16.893852516           ~ 2 0
85 Gaia DR3 1573486145340280576 * 12 13 25.3303602600 +54 54 35.014575384           ~ 2 0
86 Gaia DR3 1573450101975408640 * 12 14 02.3220736056 +54 31 02.944350048           ~ 2 0
87 Gaia DR3 1573590495865679104 * 12 14 17.2182443328 +55 15 18.057546000           ~ 1 0
88 Gaia DR3 1572734457344523648 * 12 16 35.0767886592 +54 51 54.873267912           ~ 1 0
89 2MASS J12170087+5609591 * 12 17 00.9211610760 +56 09 59.385668760           F3V 5 0
90 Gaia DR3 1572685563436585856 * 12 17 11.0151699912 +54 20 06.721055304           ~ 1 0
91 Gaia DR3 1572853513837456000 * 12 17 23.5670138352 +55 22 28.424795916           ~ 1 0
92 Gaia DR3 1574469078671384576 * 12 23 03.4493024160 +56 27 10.521676404           ~ 1 0
93 Gaia DR3 1571657077684041472 * 12 38 04.3972370376 +56 29 17.343495492           ~ 1 0
94 Gaia DR3 1571421159424398336 * 12 41 33.7936805832 +55 58 43.091184396           ~ 2 0
95 SDSS J130505.41+580758.2 * 13 05 05.4178389240 +58 07 58.206503568           F5 5 0
96 Gaia DR3 1578662783523507584 * 13 06 36.9225327264 +58 28 32.069173728           ~ 2 0
97 SDSS J131222.29+580545.9 * 13 12 22.2695886288 +58 05 46.022227548           A0 4 0
98 SDSS J143524.85+584629.3 * 14 35 24.8528006952 +58 46 29.221240260           F5 3 0
99 NAME Palomar 5 Stream St* 15 16 05 -00 06.7           ~ 132 0
100 NAME GD-1 Stream St* 22 40 +31.           ~ 319 0

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