2021ApJ...920...51M

Query : 2021ApJ...920...51M

2021ApJ...920...51M - Astrophys. J., 920, 51-51 (2021/October-2)

Evidence of a dwarf galaxy stream populating the inner Milky Way halo.

MALHAN K., YUAN Z., IBATA R.A., ARENTSEN A., BELLAZZINI M. and MARTIN N.F.

Abstract (from CDS):

Stellar streams produced from dwarf galaxies provide direct evidence of the hierarchical formation of the Milky Way. Here, we present the first comprehensive study of the LMS-1 stellar stream, that we detect by searching for wide streams in the Gaia EDR3 data set using the STREAMFINDER algorithm. This stream was recently discovered by Yuan et al. We detect LMS-1 as a 60° long stream to the north of the galactic bulge, at a distance of ∼20 kpc from the Sun, together with additional components that suggest that the overall stream is completely wrapped around the inner Galaxy. Using spectroscopic measurements from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, the Sloan Digital Sky Survey, and the Apache Point Observatory Galactic Evolution Experiment, we infer that the stream is very metal-poor (<[Fe/H]> = -2.1) with a significant metallicity dispersion (σ[Fe/H] = 0.4), and it possesses a large radial velocity dispersion (σv = 20 ± 4 km s–1). These estimates together imply that LMS-1 is a dwarf galaxy stream. The orbit of LMS-1 is close to polar, with an inclination of 75° to the galactic plane. Both the orbit and metallicity of LMS-1 are remarkably similar to the globular clusters NGC 5053, NGC 5024, and the stellar stream Indus. These findings make LMS-1 an important contributor to the stellar population of the inner Milky Way halo.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Milky Way stellar halo - Stellar streams - Milky Way formation - Surveys - Galaxy stellar content - Galaxy structure

VizieR on-line data: <Available at CDS (J/ApJ/920/51): table1.dat>

Simbad objects: 85

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Number of rows : 85
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Cetus-Palca Stream St* 01 31 +01.0           ~ 97 1
3 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
4 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
7 UCAC4 517-054431 Pe* 13 01 21.2404280564 +13 13 47.725640349   17.166 16.398 16.172   ~ 2 0
8 UCAC4 538-054284 Pe* 13 10 08.2168420654 +17 25 33.033771295           ~ 1 0
9 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
10 NAME LMS-1 Stream St* 13 14.5 +17 56           ~ 63 0
11 UCAC4 531-053769 Pe* 13 15 45.1214417248 +16 07 37.107223625   16.083 15.323 15.165   ~ 6 0
12 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
13 UCAC4 538-054572 Pe* 13 23 56.4491278966 +17 29 30.867922143   16.373 15.166 15.003   ~ 1 0
14 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
15 2MASS J13332598+1805523 Pe* 13 33 25.9838233646 +18 05 52.460197591           ~ 2 0
16 2MASS J13374678+2244549 Pe* 13 37 46.7938892655 +22 44 54.803700083           ~ 1 0
17 2MASS J13375653+2112079 Pe* 13 37 56.5713906438 +21 12 07.979549931           ~ 1 0
18 UCAC4 564-050649 Pe* 13 38 50.9553086043 +22 46 36.747291584           ~ 1 0
19 2MASS J13394367+2303022 Pe* 13 39 43.6848156006 +23 03 02.342450417           ~ 1 0
20 UCAC4 543-054778 Pe* 13 41 56.2432723828 +18 25 58.600694784   16.564 16.042 15.868   ~ 1 0
21 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
22 SDSS J134252.98+200548.1 * 13 42 52.9898340545 +20 05 48.194390348           ~ 1 0
23 2MASS J13461753+2405235 Pe* 13 46 17.5335161939 +24 05 23.591300232           ~ 1 0
24 SDSS J134703.50+194608.5 * 13 47 03.5132941537 +19 46 08.502326978           ~ 1 0
25 SDSS J134952.48+183824.6 Pe* 13 49 52.4820793277 +18 38 24.722824714           F2 2 0
26 2MASS J13531691+1921568 Pe* 13 53 16.9051033002 +19 21 56.792862712           ~ 1 0
27 UCAC4 559-052855 Pe* 13 53 53.3929849853 +21 41 03.790888161       16.003   ~ 2 0
28 UCAC4 573-051561 Pe* 14 05 57.0751107210 +24 30 47.838258551   17.044 16.385 15.899   ~ 2 0
29 UCAC4 582-049020 Pe* 14 09 50.6829396347 +26 12 17.131714828       16.034   ~ 2 0
30 UCAC4 571-051991 Pe* 14 12 57.0441467135 +24 01 34.243907265   17.274 16.337     ~ 2 0
31 UCAC4 570-051557 Pe* 14 15 22.6879482889 +23 53 53.594096663   16.228 15.281 15.450   ~ 2 0
32 UCAC4 595-051258 Pe* 14 21 48.7235686689 +28 58 33.760603676       15.438   G2 6 0
33 UCAC4 593-052570 Pe* 14 26 08.7637492894 +28 28 45.497401250   16.006 15.092 14.772   ~ 4 0
34 2MASS J14335836+2610161 Pe* 14 33 58.3567000377 +26 10 16.241769164           ~ 1 0
35 2MASS J14432110+2845390 Pe* 14 43 21.1050735936 +28 45 38.787143534           ~ 1 0
36 2MASS J14432749+2614216 Pe* 14 43 27.4979228407 +26 14 21.727615954           ~ 1 0
37 UCAC4 592-052435 Pe* 14 44 02.0192310107 +28 22 10.509172494   15.787 14.806 14.688   ~ 1 0
38 UCAC4 594-050496 Pe* 14 45 18.9518915537 +28 36 25.971028766       16.264   ~ 2 0
39 UCAC4 583-050896 Pe* 14 46 47.2108628997 +26 29 45.890812465   16.232 15.349 15.155   ~ 2 0
40 UCAC4 579-049797 Pe* 14 49 59.3251900928 +25 36 34.795218069           ~ 3 0
41 2MASS J14503078+2716298 Pe* 14 50 30.8377468437 +27 16 30.070485992           ~ 1 0
42 2MASS J14520890+3117262 Pe* 14 52 08.9016124812 +31 17 26.558222512           ~ 1 0
43 2MASS J14521978+2406385 Pe* 14 52 19.8187130585 +24 06 38.555697923           ~ 1 0
44 UCAC4 593-053236 Pe* 14 56 48.2641603871 +28 24 11.271104537   16.995 16.239 16.185   ~ 2 0
45 UCAC4 578-052528 Pe* 14 59 22.4221297673 +25 24 14.338753992           ~ 1 0
46 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 375 0
47 2MASS J15023749+2851109 Pe* 15 02 37.4948828990 +28 51 10.909831196           ~ 1 0
48 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 441 0
49 SDSS J150634.34+305738.8 * 15 06 34.3456210588 +30 57 38.819616943           ~ 1 0
50 SDSS J150644.24+283046.3 Pe* 15 06 44.2455562885 +28 30 46.386778063           ~ 1 0
51 SDSS J150715.21+311131.8 * 15 07 15.2165731755 +31 11 31.865445768           ~ 1 0
52 SDSS J150800.04+292955.1 Pe* 15 08 00.0403308550 +29 29 55.142356737           ~ 1 0
53 2MASS J15083945+2748536 Pe* 15 08 39.4598903128 +27 48 53.575998915           ~ 2 0
54 SDSS J151005.89+311002.2 Pe* 15 10 05.8972204195 +31 10 02.207838713           ~ 1 0
55 SDSS J151113.30+255617.7 Pe* 15 11 13.3004479820 +25 56 17.723481749           ~ 2 0
56 2MASS J15112255+3209526 Pe* 15 11 22.5466431274 +32 09 52.632605762           G0 2 0
57 2MASS J15122722+3021533 Pe* 15 12 27.2271390006 +30 21 53.378758489           ~ 1 0
58 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
59 2MASS J15162855+2826005 Pe* 15 16 28.5839970900 +28 26 00.812154477           ~ 1 0
60 2MASS J15223597+3125531 Pe* 15 22 35.9723360990 +31 25 53.306615049           ~ 1 0
61 UCAC4 602-052489 Pe* 15 24 06.3442524157 +30 19 01.553565289   15.580 14.493 14.089   ~ 2 0
62 2MASS J15270526+2954152 Pe* 15 27 05.2721465340 +29 54 15.290556054           ~ 2 0
63 2MASS J15274988+2932552 Pe* 15 27 49.8675892332 +29 32 55.095008465           ~ 1 0
64 UCAC4 601-053497 Pe* 15 31 37.5967423807 +30 01 31.748208987       15.644   ~ 1 0
65 SDSS J153226.42+284820.6 * 15 32 26.4234758244 +28 48 20.467897323           ~ 1 0
66 UCAC4 584-051547 Pe* 15 38 15.5910700842 +26 47 09.397475366   17.144 16.506 16.172   ~ 1 0
67 UCAC4 592-053964 Pe* 15 43 34.4059129434 +28 14 39.228285557   15.908 14.851 14.590   ~ 2 0
68 2MASS J15435332+2823272 Pe* 15 43 53.3253489983 +28 23 27.309030856           ~ 1 0
69 UCAC4 605-053158 Pe* 15 48 34.9755568580 +30 59 53.576669129           ~ 2 0
70 UCAC4 604-052934 Pe* 15 51 43.1829793908 +30 36 42.980980671   16.436 15.893 15.313   ~ 1 0
71 2MASS J15532880+2730119 Pe* 15 53 28.8350393828 +27 30 11.117962041           ~ 1 0
72 2MASS J15550344+3006120 Pe* 15 55 03.4316143269 +30 06 11.988062763           ~ 1 0
73 2MASS J15561937+2908527 * 15 56 19.3741784541 +29 08 52.614650340           ~ 1 0
74 2MASS J15573641+2823304 Pe* 15 57 36.4060600098 +28 23 30.553436924           ~ 1 0
75 2MASS J16000055+3208499 Pe* 16 00 00.5613490770 +32 08 49.872949601           ~ 1 0
76 UCAC4 607-052280 Pe* 16 19 56.2987279846 +31 13 25.363463392           ~ 2 0
77 UCAC4 608-054088 Pe* 16 20 50.7250107655 +31 24 52.567518061           G2 2 0
78 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
79 ESO 280-6 GlC 18 09 06.000 -46 25 24.00           ~ 74 0
80 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
81 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
82 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
83 NAME Jhelum Stream St* 21 25 -45.1           ~ 40 0
84 NAME Indus Stream St* 21 35 -50.7           ~ 34 0
85 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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