2018ApJ...854...47S

Query : 2018ApJ...854...47S

2018ApJ...854...47S - Astrophys. J., 854, 47-47 (2018/February-2)

A disk origin for the Monoceros Ring and A13 stellar overdensities.

SHEFFIELD A.A., PRICE-WHELAN A.M., TZANIDAKIS A., JOHNSTON K.V., LAPORTE C.F.P. and SESAR B.

Abstract (from CDS):

The Monoceros Ring (also known as the Galactic Anticenter Stellar Structure) and A13 are stellar overdensities at estimated heliocentric distances of d ∼ 11 kpc and 15 kpc observed at low Galactic latitudes toward the anticenter of our Galaxy. While these overdensities were initially thought to be remnants of a tidally disrupted satellite galaxy, an alternate scenario is that they are composed of stars from the Milky Way (MW) disk kicked out to their current location due to interactions between a satellite galaxy and the disk. To test this scenario, we study the stellar populations of the Monoceros Ring and A13 by measuring the number of RR Lyrae and M giant stars associated with these overdensities. We obtain low-resolution spectroscopy for RR Lyrae stars in the two structures and measure radial velocities to compare with previously measured velocities for M giant stars in the regions of the Monoceros Ring and A13, to assess the fraction of RR Lyrae to M giant stars (fRR:MG) in A13 and Mon/GASS. We perform velocity modeling on 153 RR Lyrae stars (116 in the Monoceros Ring and 37 in A13) and find that both structures have very low fRR:MG. The results support a scenario in which stars in A13 and Mon/GASS formed in the MW disk. We discuss a possible association between Mon/GASS, A13, and the Triangulum-Andromeda overdensity based on their similar velocity distributions and fRR:MG.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: interactions - Galaxy: disk - Galaxy: formation - Galaxy: halo - Galaxy: structure

VizieR on-line data: <Available at CDS (J/ApJ/854/47): table1.dat>

Simbad objects: 157

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Number of rows : 157
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 SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 ATO J097.2466+55.8772 RR* 06 28 59.1819599880 +55 52 38.241531228     15.55     ~ 12 0
4 ATO J098.3949+52.8357 RR* 06 33 34.7733589656 +52 50 08.832739776     15.97     ~ 9 0
5 ATO J098.6962+51.7557 RR* 06 34 47.0913074208 +51 45 20.759176620     16.39     ~ 9 0
6 ATO J099.4493+58.4868 RR* 06 37 47.8314958896 +58 29 12.727050756     15.21     ~ 11 0
7 ATO J099.8924+56.9621 RR* 06 39 34.1927095704 +56 57 43.619362704     16.16     ~ 13 0
8 ATO J100.7709+57.6141 RR* 06 43 05.0273212416 +57 36 51.127066836     16.68     ~ 13 0
9 ATO J100.9132+42.8432 RR* 06 43 39.1869894384 +42 50 35.820773736     15.17     ~ 12 0
10 ATO J101.0399+58.3020 RR* 06 44 09.5752625688 +58 18 07.326474588     16.70     ~ 10 0
11 ZTF J064412.62+604915.0 RR* 06 44 12.6203523624 +60 49 15.094716096     16.65     ~ 9 0
12 ATO J101.3964+37.9887 RR* 06 45 35.1468756984 +37 59 19.428555372     15.88     ~ 7 0
13 ATO J103.2008+53.8750 RR* 06 52 48.1926581760 +53 52 30.384594732     15.76     ~ 14 0
14 ATO J103.2148+44.9907 RR* 06 52 51.5588617272 +44 59 26.718365976     16.58     ~ 11 0
15 ATO J103.4304+43.8865 RR* 06 53 43.2946361736 +43 53 11.723057052     15.51     ~ 10 0
16 ATO J104.4831+38.5541 RR* 06 57 55.9599469680 +38 33 14.960805480     16.42     ~ 9 0
17 ZTF J070213.60+641216.8 RR* 07 02 13.5767348904 +64 12 16.823169252     15.24     ~ 10 0
18 ATO J106.4975+33.2089 RR* 07 05 59.4053701872 +33 12 32.105001384     15.42     ~ 8 0
19 ATO J107.2610+42.2776 RR* 07 09 02.6570702568 +42 16 39.625917960     15.27     ~ 8 0
20 ATO J107.3514+54.1898 RR* 07 09 24.3341985144 +54 11 23.599184568     16.53     ~ 11 0
21 ATO J107.4030+44.3691 RR* 07 09 36.7355777424 +44 22 08.864318712     15.04     ~ 8 0
22 ATO J107.6853+57.4792 RR* 07 10 44.4736121520 +57 28 45.302139480     17.06     ~ 11 0
23 ATO J109.8102+44.0780 RR* 07 19 14.4514918488 +44 04 41.151714024     16.37     ~ 11 0
24 ATO J109.8744+26.0138 RR* 07 19 29.8705915128 +26 00 49.896301176     16.25     ~ 10 0
25 ATO J110.0442+40.8913 RR* 07 20 10.6256662344 +40 53 29.054164452     15.68     ~ 11 0
26 ATO J110.5471+29.5160 RR* 07 22 11.3137761504 +29 30 57.712096764     15.35     ~ 14 0
27 ATO J111.4569+35.0298 RR* 07 25 49.6724432112 +35 01 47.470859040     16.04     ~ 10 0
28 ATO J111.6835+44.8644 RR* 07 26 44.0549126088 +44 51 52.039773648     15.40     ~ 10 0
29 ATO J111.7537+25.1881 RR* 07 27 00.9002072472 +25 11 17.540206548     16.17     ~ 11 0
30 ATO J112.0861+59.9301 RR* 07 28 20.6653625640 +59 55 48.723202416     16.57     ~ 14 0
31 ATO J112.1488+49.6642 RR* 07 28 35.7190387097 +49 39 51.195080604     16.38     ~ 5 0
32 ATO J112.6269+47.1380 RR* 07 30 30.4722523056 +47 08 17.119005108     16.86     ~ 13 0
33 ATO J112.8047+24.7518 RR* 07 31 13.1247311160 +24 45 06.570488988     16.75     ~ 11 0
34 NSV 3618 RR* 07 31 27.3752435208 +29 32 30.972436368   15.6 15.93     ~ 9 0
35 ATO J113.4524+27.7058 RR* 07 33 48.5882432472 +27 42 21.299101848     15.28     ~ 12 0
36 ATO J113.5258+25.9329 RR* 07 34 06.1932102336 +25 55 58.637813736   16.5 16.01 15.5   ~ 11 0
37 V* WX Lyn RR* 07 35 38.4745359576 +39 15 26.658639396     16.82     F0III 29 0
38 ATO J114.0460+33.6362 RR* 07 36 11.0416094976 +33 38 10.700169972     15.67     ~ 12 0
39 ATO J114.1875+53.5544 RR* 07 36 45.0097527864 +53 33 16.189204176     15.72     ~ 11 0
40 ATO J114.2121+52.6543 RR* 07 36 50.9112637056 +52 39 15.573417192     16.26     ~ 13 0
41 ATO J114.4560+34.2410 RR* 07 37 49.4390319672 +34 14 27.978839376     15.73     ~ 10 0
42 ATO J114.7312+18.8254 RR* 07 38 55.5078279456 +18 49 31.768863024     15.98     ~ 14 0
43 ATO J114.8287+25.2224 RR* 07 39 18.8974690536 +25 13 20.940569436     15.13     ~ 14 0
44 ATO J115.3664+51.9058 RR* 07 41 27.9467074752 +51 54 21.198376512     17.18     ~ 12 0
45 ATO J115.6626+59.1047 RR* 07 42 39.0362150424 +59 06 16.977413808     15.49     ~ 13 0
46 ATO J116.5520+34.5448 RR* 07 46 12.4864438080 +34 32 41.572771188     16.26     ~ 15 0
47 ATO J117.1365+33.1635 RR* 07 48 32.7749456808 +33 09 48.933766656     16.16     ~ 12 0
48 V* ZZ Lyn RR* 07 50 21.7800340344 +37 41 59.883031680     16.11     B 32 0
49 ATO J117.8242+58.4231 RR* 07 51 17.8124433840 +58 25 23.391340248     16.31     ~ 15 0
50 ATO J118.3780+54.7877 RR* 07 53 30.7347029928 +54 47 15.956454588     15.48     ~ 10 0
51 LINEAR 43542 RR* 07 54 00.8312282352 +49 41 11.615961120     16.15     F0V 13 0
52 ATO J118.5457+57.7108 RR* 07 54 10.9794720216 +57 42 39.089329128     15.51     ~ 13 0
53 ZTF J075414.66+150523.6 RR* 07 54 14.6619696912 +15 05 23.659749996     15.197     ~ 11 0
54 V* PT Gem RR* 07 54 36.5152023600 +27 59 58.630437312     16.09     A0 17 0
55 V* AC Lyn RR* 07 54 42.1611499866 +38 54 20.178181326     16.53     ~ 20 0
56 [DCD2013] CSS J075602.4+611717 RR* 07 56 02.5147940136 +61 17 17.867115744     15.44     ~ 6 0
57 [DCD2013] CSS J075644.3+502741 RR* 07 56 44.3457285024 +50 27 40.954346064     16.68     F0V 11 0
58 LINEAR 62892 RR* 07 56 44.9424673200 +53 22 45.458743368     16.46     ~ 14 0
59 ATO J119.5241+17.0986 RR* 07 58 05.8048725144 +17 05 55.363298568     15.58     F5 13 0
60 LINEAR 29848 RR* 07 58 06.3429145872 +46 57 43.664793192     16.34     ~ 10 0
61 [SJM2010] A13 As* 07 58 35 +71 26.6           ~ 19 0
62 LINEAR 50402 RR* 07 58 51.1161457728 +52 08 58.512748272     16.41     ~ 14 0
63 ATO J119.7138+08.5801 RR* 07 58 51.3346037712 +08 34 48.423136764     16.12     ~ 10 0
64 ATO J119.8381+36.2313 RR* 07 59 21.1562203392 +36 13 52.905810936     15.10     ~ 9 0
65 ATO J119.8832+07.6367 RR* 07 59 31.9759015128 +07 38 12.523090128     15.13     ~ 12 0
66 LINEAR 162255 RR* 08 00 36.9648282648 +52 38 22.979110632     15.85     ~ 15 0
67 LINEAR 91437 RR* 08 01 10.7969949864 +40 55 56.791662960     15.48     ~ 13 0
68 ZTF J080156.21+410117.5 RR* 08 01 56.2055570040 +41 01 17.740562736     15.07 15.31   ~ 12 0
69 LINEAR 158779 RR* 08 03 00.3015946224 +51 51 58.275462420     15.41     ~ 14 0
70 ATO J120.7651+10.3240 RR* 08 03 03.6469827696 +10 19 26.598754272     15.93     ~ 11 0
71 LINEAR 136668 RR* 08 03 11.4833977608 +46 51 03.454005456     16.67     F0V 18 0
72 V* AZ Lyn RR* 08 03 39.8153419464 +42 30 44.962389972   15.79 16.58     A1III 20 0
73 V* Y Cnc RR* 08 04 27.0799084248 +20 07 50.330893980     15.13     ~ 17 0
74 V* BB Lyn RR* 08 04 36.1790163504 +42 29 00.825902628   16.31 16.74     A0 21 0
75 ATO J121.1697+25.1579 RR* 08 04 40.7423130672 +25 09 28.671607980     15.86     ~ 10 0
76 ATO J121.8774+30.4423 RR* 08 07 30.5841903912 +30 26 32.702796492     14.96     ~ 15 0
77 ATO J122.0226-02.7830 RR* 08 08 05.4256830816 -02 46 59.043660672     16.00 15.87 15.60 ~ 11 0
78 ZTF J080902.79+095642.3 RR* 08 09 02.7964238760 +09 56 42.430311996     16.37     ~ 11 0
79 ATO J122.3167+28.6435 RR* 08 09 16.0075066296 +28 38 36.780242964     15.80     ~ 16 0
80 LINEAR 309626 RR* 08 09 39.1834100976 +48 47 25.359009756     15.13     ~ 11 0
81 LINEAR 215632 RR* 08 10 42.5272880376 +32 24 44.253611964     16.08     ~ 16 0
82 LINEAR 303860 RR* 08 11 03.9073809960 +46 53 34.965457584     16.18     F0V 18 0
83 ATO J122.8626+24.6923 RR* 08 11 27.0237061968 +24 41 32.360777232   16.4 16.30 16.2   F5 13 0
84 Case A-F 194 RR* 08 12 00.6375946056 +40 39 19.859817132     15.77     A0 14 0
85 ATO J123.3438+26.0036 RR* 08 13 22.5118841976 +26 00 13.389569496     15.02     ~ 13 0
86 LINEAR 301424 RR* 08 13 59.9610317808 +45 41 56.121311256     16.92     F0Ib 13 0
87 ZTF J081403.72+144855.2 RR* 08 14 03.7255893456 +14 48 55.344663684     15.99     ~ 16 0
88 ATO J123.7890+35.6355 RR* 08 15 09.3617538504 +35 38 08.149140996     16.44     ~ 13 0
89 ATO J123.9754+04.3241 RR* 08 15 54.1030324536 +04 19 26.996557080     16.24     ~ 13 0
90 ATO J124.2135+01.8423 RR* 08 16 51.2502397032 +01 50 32.522518968     15.49     ~ 10 0
91 ATO J124.2785+14.2726 RR* 08 17 06.8595574200 +14 16 21.501474960     15.50     ~ 19 0
92 LINEAR 420327 RR* 08 18 12.1179108408 +29 14 15.817538976     15.81     ~ 15 0
93 CRTS J081937.1+154754 RR* 08 19 37.0848134616 +15 47 54.718402020     15.54     ~ 16 0
94 LINEAR 439441 RR* 08 19 49.0696398528 +32 17 12.459200064     16.30     ~ 15 0
95 LINEAR 386501 RR* 08 20 10.1586075720 +26 43 07.949305668     16.47     A0 14 0
96 ATO J125.3174+02.2948 RR* 08 21 16.1798026584 +02 17 41.328276252     16.14     ~ 9 0
97 ATO J125.6220+15.9083 RR* 08 22 29.3028839592 +15 54 29.968094592     14.98     F5 16 0
98 ATO J126.3438+08.7481 RR* 08 25 22.5164010480 +08 44 53.423831508     15.97     ~ 13 0
99 LINEAR 771232 RR* 08 25 48.8204400552 +43 28 39.450861552     16.08     A0 17 0
100 ZTF J082551.13+264905.1 RR* 08 25 51.1382036376 +26 49 05.147595408     16.30     ~ 15 0
101 [MRS2008] 126.718193+22.681629 RR* 08 26 52.3579976736 +22 40 54.103412424           ~ 16 0
102 ZTF J082748.81+271903.5 RR* 08 27 48.8142500664 +27 19 03.554343984     16.45     F5 20 0
103 LINEAR 810169 RR* 08 29 48.0723873216 +51 51 08.504374104     16.09     A4V 16 0
104 LINEAR 798477 RR* 08 30 15.0521517144 +49 50 24.743440896     16.46     A0V 19 0
105 ATO J127.6988+33.6525 RR* 08 30 47.7222551856 +33 39 09.061439472     16.23     ~ 9 0
106 LINEAR 664583 RR* 08 31 35.9121630312 +27 03 29.727816408     16.54     F5 17 0
107 LINEAR 4600749 RR* 08 33 15.4681936968 +18 36 02.251365120     16.12     ~ 16 0
108 LINEAR 4672469 RR* 08 34 40.7155856856 +25 32 40.847066160     16.19     F5 16 0
109 ATO J128.6882+11.8283 RR* 08 34 45.1797174192 +11 49 42.152307888     16.29     ~ 8 0
110 LINEAR 4586691 RR* 08 35 06.6561511056 +15 59 06.786098304     15.54     A0 18 0
111 LINEAR 4620408 RR* 08 35 25.0089583488 +19 46 59.809820304     16.00     ~ 17 0
112 LINEAR 4815083 RR* 08 35 27.0569690256 +50 56 55.861162548     16.07     F2V 15 0
113 ATO J130.3351+04.4170 RR* 08 41 20.4392374440 +04 25 01.457241888     15.83     ~ 12 0
114 LINEAR 5115185 RR* 08 43 11.8835774040 +46 50 13.542450504     16.70     F0V 18 0
115 ATO J131.3397-06.1033 RR* 08 45 21.5366984640 -06 06 11.945726136     16.38 16.08 15.88 ~ 11 0
116 ATO J131.4328+05.1237 RR* 08 45 43.8748528200 +05 07 25.604380272     16.45     A0 14 0
117 ATO J131.5572+07.8684 RR* 08 46 13.7457557520 +07 52 06.547187748     16.11     A0 15 0
118 LINEAR 5122878 RR* 08 46 35.8243869528 +47 52 23.731761216     16.81     A3III 16 0
119 LINEAR 4912051 RR* 08 47 23.7512046864 +16 05 54.176466084     16.08     ~ 14 0
120 ATO J131.8845-04.4968 RR* 08 47 32.2953296712 -04 29 48.719175144     15.17     ~ 8 0
121 LINEAR 5272753 RR* 08 48 03.5800215816 +19 13 40.642048596     16.19     ~ 22 0
122 ATO J132.1337+03.1492 RR* 08 48 32.1020638896 +03 08 57.233682276     15.93     ~ 13 0
123 ATO J132.1556-02.8329 RR* 08 48 37.3466219904 -02 49 58.621798632     16.02 15.81 15.61 ~ 13 0
124 LINEAR 5244248 RR* 08 49 20.4953690640 +18 26 17.396937132   16.1 15.72 15.9   A0 19 0
125 LINEAR 5416042 RR* 08 52 32.0415181824 +42 01 19.461945036     16.07     A0 15 0
126 ATO J133.4807+02.6829 RR* 08 53 55.3867004880 +02 40 58.696290588     16.54     ~ 9 0
127 LINEAR 5460635 RR* 08 54 37.2311201328 +51 16 21.721554516   16.2 16.41 16.1   A7III 19 0
128 LINEAR 5253415 RR* 08 54 49.1783165736 +17 36 15.917269644     16.51     ~ 19 0
129 NAME Hydra I overdensity As* 08 56 +03.5           ~ 8 0
130 LINEAR 5824361 RR* 08 56 09.2359840896 +52 12 45.880472340     17.12     F8V 16 0
131 LINEAR 5837620 RR* 08 56 36.6340440168 +55 59 04.936412976     16.58     F0Ib 15 0
132 LINEAR 5895287 RR* 08 57 54.6517989792 +10 52 22.198771452     16.08     ~ 17 0
133 LINEAR 5839006 RR* 08 58 03.3043523184 +55 45 45.394515720     16.16     F0I 17 0
134 ZTF J090042.91-002812.0 RR* 09 00 42.9167969736 -00 28 11.978234472     14.97     ~ 13 0
135 LINEAR 5896424 RR* 09 01 14.8813365816 +10 55 32.049409332     16.27     ~ 13 0
136 ATO J137.3251-06.3045 RR* 09 09 18.0360044376 -06 18 16.420755492     16.45     ~ 7 0
137 LINEAR 6299726 RR* 09 15 35.8256467008 +00 21 30.094530516   16.1 16.21     ~ 13 0
138 LINEAR 6290507 RR* 09 17 15.7649518944 +02 25 19.580778336     16.06     A0 10 0
139 ATO J139.4375-04.5798 RR* 09 17 45.0051190992 -04 34 47.336256804     15.55     ~ 7 0
140 V* V523 Hya RR* 09 19 44.9239541136 -00 01 57.069949080     16.20     A0 18 0
141 LINEAR 6284132 RR* 09 19 46.9233330024 +01 10 14.646167616     16.46     A0 15 0
142 ATO J140.1192-07.8696 RR* 09 20 28.6245867357 -07 52 10.529072413     15.53     ~ 5 0
143 LINEAR 6698387 RR* 09 25 04.4271955560 +00 31 36.759139860     15.10     ~ 12 0
144 ATO J141.4518-08.1833 RR* 09 25 48.4400683200 -08 11 00.027077172     16.40     ~ 10 0
145 ATO J141.4914-05.4239 RR* 09 25 57.9534385200 -05 25 26.156392608     15.75     ~ 10 0
146 V* V529 Hya RR* 09 27 01.7188182960 -00 09 34.212051396     15.15     ~ 12 0
147 ATO J143.7714-09.2221 RR* 09 35 05.1456457944 -09 13 19.704294444   16.6 16.28     ~ 8 0
148 ATO J143.9565-04.2584 RR* 09 35 49.5598725360 -04 15 30.261214332     15.67     ~ 7 0
149 ATO J144.0324-12.4012 RR* 09 36 07.7807783688 -12 24 04.456346184     15.49     ~ 11 0
150 ATO J144.3026-07.0285 RR* 09 37 12.6301574184 -07 01 42.635437860     16.31     ~ 10 0
151 [DCD2013] CSS J094118.0-065433 RR* 09 41 18.0075492648 -06 54 33.689560392     15.88     ~ 6 0
152 ATO J145.4087-15.9408 RR* 09 41 38.1036773640 -15 56 26.978201844     16.54     ~ 8 0
153 ATO J147.8463-06.9045 RR* 09 51 23.1259228344 -06 54 16.449106932     16.22     ~ 8 0
154 ATO J153.4581-13.0992 RR* 10 13 49.9632850176 -13 05 57.125434560     15.93     ~ 7 0
155 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
156 NAME Monoceros Stream St* ~ ~           ~ 374 1
157 NAME Triangulum-Andromeda Region reg ~ ~           ~ 89 0

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