2022ApJ...936L...3O

Query : 2022ApJ...936L...3O

2022ApJ...936L...3O - Astrophys. J., 936, L3 (2022/September-1)

Antaeus: A Retrograde Group of Tidal Debris in the Milky Way's Disk Plane.

ORIA P.-A., TENACHI W., IBATA R., FAMAEY B., YUAN Z., ARENTSEN A., MARTIN N. and VISWANATHAN A.

Abstract (from CDS):

We present the discovery of a wide retrograde moving group in the disk plane of the Milky Way using action-angle coordinates derived from the Gaia DR3 catalog. The structure is identified from a sample of its members that are currently almost at the pericenter of their orbit and are passing through the solar neighborhood. The motions of the stars in this group are highly correlated, indicating that the system is probably not phase mixed. With a width of at least 1.5 kpc and with a probable intrinsic spread in metallicity, this structure is most likely the wide remnant of a tidal stream of a disrupted ancient dwarf galaxy (age ∼12 Gyr, 〈[Fe/H]〉 ∼ -1.74). The structure presents many similarities (e.g., in energy, angular momentum, metallicity, and eccentricity) with the Sequoia merging event. However, it possesses extremely low vertical action Jz, which makes it unique even among Sequoia dynamical groups. As the low Jz may be attributable to dynamical friction, we speculate that these stars may be the remnants of the dense core of the Sequoia progenitor.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxies - Stellar streams - Milky Way dynamics - Local Group - Milky Way stellar halo - Tidal disruption - Milky Way disk

Nomenclature: NAME Antaeus Stream N=1.

Simbad objects: 70

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Number of rows : 70
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 G 269-74 PM* 01 00 34.8815444184 -37 26 08.053872792   15.6       ~ 4 0
2 LSPM J0148+6012 PM* 01 48 48.4777118736 +60 12 47.774508984   16.3   14.4   ~ 2 0
3 BPS CS 22189-0004 PM* 02 32 26.9968907832 -14 38 37.975919028   13.87 13.42 13.42   ~ 6 0
4 BPS CS 22184-0038 PM* 02 49 39.3701043048 -10 18 22.077130896   13.38 12.91 12.93   ~ 3 0
5 L 54-9 PM* 03 21 17.9516237880 -71 40 17.015569104   14.09 13.54 13.56 12.82 ~ 5 0
6 2MASS J03361174-3241219 PM* 03 36 11.7708296472 -32 41 21.907153680           ~ 3 0
7 BPS CS 29529-0119 Pe* 03 42 13.9284569160 -60 45 34.393494312   15.11 14.58 14.56   ~ 4 0
8 LSPM J0351+4204 PM* 03 51 00.5822628360 +42 04 02.118570240   13.4   12.3   ~ 3 0
9 2MASS J04162667-5851505 HV* 04 16 26.6821684512 -58 51 50.402975328           ~ 3 0
10 2MASS J04434981-4320583 Pe* 04 43 49.8190175162 -43 20 58.264946813     13.7     ~ 2 0
11 Gaia DR3 2985675519730755072 PM* 05 21 56.6170825892 -13 32 07.201641762           ~ 1 0
12 CD-29 2277 PM* 05 28 50.9297117788 -29 53 47.778591790   12.13 11.61     F6 70 0
13 G 98-32 PM* 05 59 06.4631692701 +34 38 18.084429999   16.0   14.6   ~ 14 0
14 Gaia DR3 5495491404913936512 PM* 06 29 51.8342924416 -56 23 51.219843298           ~ 1 0
15 Gaia DR3 5555775153564500864 * 06 37 00.4361939765 -46 15 30.618607515           ~ 1 0
16 G 107-26 PM* 06 51 06.4037478624 +40 20 07.440728424   14.09   13.4   ~ 12 0
17 Gaia DR3 5566106680217194368 PM* 07 09 49.0967399398 -37 16 40.543157823           ~ 1 0
18 LSPM J0713+6941 PM* 07 13 55.3741993848 +69 41 12.197944752   15.1   14.5   ~ 3 0
19 G 112-28 PM* 07 35 46.3176331792 +03 29 35.975741190   14.79   13.6   ~ 15 0
20 Gaia DR3 5599888895806847616 * 07 42 45.7767079214 -28 37 40.113757711           ~ 1 0
21 Wolf 1059 Pe* 08 00 28.7327618692 +29 00 27.401995982   13.30 12.66 12.89   G2 54 0
22 Gaia DR3 5698935961252997248 PM* 08 07 14.5346775960 -23 27 20.633033393           ~ 1 0
23 Gaia DR3 5519379909945907072 * 08 11 56.5687643017 -46 40 37.271450707           ~ 1 0
24 LP 208-45 PM* 08 13 25.9638196488 +39 51 56.813376888   13.37   12.7   ~ 8 0
25 Gaia DR3 5515906346553555840 * 08 15 34.7177854933 -48 23 42.333057188           ~ 1 0
26 LP 606-23 Pe* 08 54 07.8732088104 -02 08 00.746168100   13.704 13.280 12.989 12.681 ~ 12 0
27 Gaia DR3 5757799278315703296 PM* 08 59 14.7590875102 -05 15 10.356396689           ~ 2 0
28 LAMOST J091849.92-005331.5 HV* 09 18 49.9219181256 -00 53 31.543197072           A5 4 0
29 Gaia DR3 5430364341908382592 PM* 09 19 41.0706007048 -39 07 37.331331259           ~ 1 0
30 WT 1692 PM* 09 47 21.3033219528 -19 16 18.455059236   15.0       ~ 2 0
31 LSPM J0951+0053 Pe* 09 51 27.7642912632 +00 53 18.850804800   14.9   14.0   ~ 4 0
32 GD 121 PM* 10 30 34.9510556616 -10 02 13.649891784   14.00 13.50 13.40   ~ 7 0
33 TYC 1977-1078-1 PM* 10 39 24.4674118152 +24 35 25.375265088   10.82 10.80 11.1   ~ 6 0
34 TYC 256-1067-1 Pe* 10 39 38.1436808592 +04 04 54.831755388   12.33 12.00     ~ 7 0
35 G 146-76 Pe* 10 59 57.4788948864 +44 46 43.724142012     10.4 10.1   ~ 38 0
36 EC 11052-1356 PM* 11 07 42.6904421400 -14 12 21.105984204   15.05 14.52     ~ 2 0
37 G 10-46 Pe* 11 45 14.4713459919 +04 02 32.889600075   15.796 14.885 14.2   ~ 8 0
38 LP 734-90 PM* 12 18 49.8015176160 -11 35 09.305823984   13.08 12.45     ~ 10 0
39 UPM J1229-5139 PM* 12 29 01.9010841120 -51 39 27.814979772   13.8   13.6 13.1 ~ 3 0
40 2MASS J12313635-6000375 PM* 12 31 36.3689177280 -60 00 37.565484696           ~ 2 0
41 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
42 Gaia DR3 1558668134509319040 SB? 13 39 57.5795023616 +49 46 24.163549715           ~ 2 0
43 LP 855-50 PM* 13 40 38.9483561937 -24 37 05.998638096   14.04 13.26 12.99   K0 12 0
44 G 200-30 PM* 14 18 32.3194969718 +49 11 01.204144623   15.5   14.4   ~ 7 0
45 Gaia DR3 1374889335770878848 Pe* 15 30 22.7789185679 +35 22 55.734889395           ~ 3 0
46 LP 442-67 Pe* 15 31 27.0881047848 +15 41 22.144764768   14.5 14.3 14.0   ~ 5 0
47 L 153-157 PM* 15 54 43.4080468446 -63 26 15.337587938   14.05 13.22 13.03   ~ 8 0
48 G 180-56 Pe* 16 28 26.3999034405 +31 57 30.457928137   15.6   13.6   ~ 16 0
49 GD 207 PM* 17 28 22.3921203576 +21 54 44.763066576   15.39 14.75 14.64   ~ 3 0
50 NAME Sequoia Cluster GlC 17 31 12.0 -39 48 30           ~ 154 0
51 LSPM J1731+3627 HV* 17 31 47.3070641592 +36 27 54.857838024       11.6   ~ 6 0
52 LP 335-14 HV* 18 39 36.0767854032 +30 13 33.296998044   13.70   13.0   ~ 7 0
53 Gaia DR3 2038062247987954048 * 19 22 59.5979603844 +28 33 06.054553537           ~ 1 0
54 SCR J2046-4321 PM* 20 46 27.4406630918 -43 21 06.578239012   14.70   13.63 13.23 ~ 3 0
55 LP 817-3 PM* 21 08 01.0475177184 -18 33 38.998961352     14.72     ~ 3 0
56 Gaia DR3 6883817898054268416 PM* 21 13 03.7304233685 -16 07 18.272327794           ~ 1 0
57 Gaia DR3 1950571427690143616 PM* 21 31 57.7065428703 +34 54 58.894877879           ~ 1 0
58 Gaia DR3 1907386149999121920 PM* 22 29 38.2837041895 +36 38 54.279437514           ~ 1 0
59 Gaia DR3 2652780576075420544 HV* 22 43 22.7832078271 -01 30 55.104539748           ~ 3 0
60 G 233-27 PM* 22 44 06.8570169262 +56 44 00.999260931   14.8 14.84 13.5   ~ 14 0
61 LP 642-13 PM* 23 10 21.3454067304 +01 11 19.508886852   14.8   13.7   ~ 5 0
62 HD 220127 Pe* 23 21 43.5876197122 -49 29 15.113713857   10.81 10.410     G3/5 61 0
63 Gaia DR3 2405678188275018624 PM* 23 25 30.9143785156 -16 51 52.450309296           ~ 2 0
64 GD 249 PM* 23 26 50.9280123168 +13 36 27.193364424   14.5   13.8   ~ 5 0
65 Gaia DR3 2310851976168886784 PM* 23 48 28.5107444644 -36 22 54.901404960           ~ 1 0
66 LP 523-52 Pe* 23 49 13.0781414880 +14 30 36.529810668   13.525 13.089 12.791 12.466 ~ 9 0
67 Gaia DR3 2340952515729081728 PM* 23 58 59.0707651409 -21 48 34.294736557           ~ 1 0
68 NAME Antaeus Stream St* ~ ~           ~ 9 0
69 NAME Local Group GrG ~ ~           ~ 9325 0
70 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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