2019A&A...623A.129F

Query : 2019A&A...623A.129F

2019A&A...623A.129F - Astronomy and Astrophysics, volume 623A129-129 (2019/3-1)

Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC.

FRITZ T.K., CARRERA R., BATTAGLIA G. and TAIBI S.

Abstract (from CDS):

A wealth of tiny galactic systems populates the surroundings of the Milky Way. However, some of these objects might have originated as former satellites of the Magellanic Clouds, in particular of the Large Magellanic Cloud (LMC). Examples of the importance of understanding how many systems are genuine satellites of the Milky Way or the LMC are the implications that the number and luminosity-mass function of satellites around hosts of different mass have for dark matter theories and the treatment of baryonic physics in simulations of structure formation. Here we aim at deriving the bulk motions and estimates of the internal velocity dispersion and metallicity properties in four recently discovered distant southern dwarf galaxy candidates, Columba I, Reticulum III, Phoenix II, and Horologium II. We combined Gaia DR2 astrometric measurements, photometry, and new FLAMES/GIRAFFE intermediate-resolution spectroscopic data in the region of the near-IR Ca II triplet lines; this combination is essential for finding potential member stars in these low-luminosity systems. We find very likely member stars in all four satellites and are able to determine (or place limits on) the bulk motions and average internal properties of the systems. The systems are found to be very metal poor, in agreement with dwarf galaxies and dwarf galaxy candidates of similar luminosity. Of these four objects, we can only firmly place Phoenix II in the category of dwarf galaxies because of its resolved high velocity dispersion (9.5–4.4+6.8km/s) and intrinsic metallicity spread (0.33dex). For Columba I we also measure a clear metallicity spread. The orbital pole of Phoenix II is well constrained and close to that of the LMC, suggesting a prior association. The uncertainty on the orbital poles of the other systems is currently very large, so that an association cannot be excluded, except for Columba I. Using the numbers of potential former satellites of the LMC identified here and in the literature, we obtain for the LMC a dark matter mass of M200=1.9–0.9+1.3x1011M☉.

Abstract Copyright: © ESO 2019

Journal keyword(s): proper motions - stars: abundances - galaxies: dwarf - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/623/A129): table2.dat>

Simbad objects: 289

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Number of rows : 289
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 Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
3 [SCS2014] SCl-MM-Dw1 G 00 47 34.93 -26 23 19.7           ~ 14 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
6 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 79 0
7 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
8 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
9 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
10 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
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12 Gaia DR3 4749259254053731200 * 03 15 37.4754448632 -49 57 39.105262620           ~ 1 0
13 Gaia DR3 4749259662074228224 * 03 15 40.7263222800 -49 55 47.024005620           ~ 1 0
14 Gaia DR3 4749209565575422720 * 03 15 41.2064859936 -50 03 48.950476164           ~ 1 0
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38 DES J031615.34-500154.5 * 03 16 15.3485838240 -50 01 54.520987116           ~ 2 0
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57 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
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73 Gaia DR3 4749214655112990336 * 03 16 45.2096650800 -49 58 23.262866076           ~ 1 0
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185 Gaia DR3 2908281716588423168 * 05 31 32.6134048704 -27 57 15.698475828           ~ 1 0
186 DES J053139.50-280509.1 * 05 31 39.5097045144 -28 05 09.106442088           ~ 2 0
187 Gaia DR3 2908281372991015424 * 05 31 41.8608614976 -27 59 32.339672232           ~ 1 0
188 Gaia DR3 2908281476070244224 * 05 31 41.9566680192 -27 58 11.780872608           ~ 1 0
189 Gaia DR3 2908306116299921920 * 05 31 42.1767712392 -27 54 19.203670728           ~ 1 0
190 Gaia DR3 2908305291665268352 * 05 31 46.9076323632 -27 55 19.875385776           ~ 1 0
191 Gaia DR3 2908305394743366528 * 05 31 48.0441113664 -27 53 51.178339500           ~ 1 0
192 Gaia DR3 2908232479083255680 * 05 31 53.4351130440 -28 05 56.502309480           ~ 1 0
193 Gaia DR3 2908232655178069376 * 05 31 55.4673755040 -28 05 01.524902820           ~ 1 0
194 DES J053156.30-275831.1 * 05 31 56.3144351328 -27 58 31.088519904           ~ 2 0
195 Gaia DR3 2908234132648048256 * 05 31 56.4726155208 -28 00 42.674160564           ~ 1 0
196 Gaia DR3 2908305944501214336 * 05 31 57.6732380088 -27 52 04.866713580           ~ 1 0
197 Gaia DR3 2908234544964902784 * 05 31 57.6844985208 -27 58 27.621091704           ~ 1 0
198 DES J053200.06-275834.7 * 05 32 00.0703567080 -27 58 34.693169268           ~ 2 0
199 Gaia DR3 2908233308014493696 * 05 32 00.0850239744 -28 02 24.153234072           ~ 1 0
200 Gaia DR3 2908258145807914368 * 05 32 03.2679696576 -27 56 05.310503700           ~ 1 0
201 Gaia DR3 2908256878794079872 * 05 32 18.4552505712 -27 59 33.704704500           ~ 1 0
202 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 204 0
203 NAME Antlia B G 09 48 56.08 -25 59 24.0           ~ 41 0
204 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
205 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
206 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
207 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
208 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
209 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
210 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
211 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
212 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
213 Gaia DR3 6497787680599430784 * 23 39 24.6729114864 -54 24 18.199480608           ~ 1 0
214 Gaia DR3 6497787680599431296 * 23 39 24.8786519904 -54 24 01.305189252           ~ 1 0
215 Gaia DR3 6497787508800730240 * 23 39 25.9267024728 -54 26 29.464619676           ~ 1 0
216 Gaia DR3 6497788200290606720 * 23 39 28.1471303760 -54 22 01.864622748           ~ 1 0
217 Gaia DR3 6497788028492833792 * 23 39 29.7381165504 -54 22 58.097324028           ~ 1 0
218 Gaia DR3 6497787989837075968 * 23 39 30.6209094120 -54 24 20.750155164           ~ 1 0
219 Gaia DR3 6497794037151036928 * 23 39 31.8418616184 -54 20 57.762471804           ~ 1 0
220 Gaia DR3 6497794041446128384 * 23 39 32.4300045864 -54 21 09.082182564           ~ 1 0
221 Gaia DR3 6497787444376808448 * 23 39 32.6016030120 -54 27 00.828408096           ~ 1 0
222 Gaia DR3 6497794041447489792 * 23 39 35.6302295016 -54 21 21.432062592           ~ 1 0
223 Gaia DR3 6497787787974630528 * 23 39 36.8612978136 -54 24 29.659232952           ~ 1 0
224 Gaia DR3 6497787822334368128 * 23 39 39.7304385120 -54 24 11.913315264           ~ 1 0
225 Gaia DR3 6497787921117601152 * 23 39 40.7670088536 -54 23 27.579404544           ~ 1 0
226 XXL-AAOmega J233941.17-542353.3 * 23 39 41.1905371416 -54 23 53.457520848           ~ 2 0
227 Gaia DR3 6497793865352343808 * 23 39 41.7069910152 -54 21 17.460982512           ~ 1 0
228 Gaia DR3 6497787714959167104 * 23 39 42.2361090864 -54 24 59.382772236           ~ 1 0
229 DES J233943.12-542522.2 RR* 23 39 43.1250343920 -54 25 22.275465384           ~ 8 0
230 Gaia DR3 6497787852398123520 * 23 39 43.7112295632 -54 23 53.426419224           ~ 1 0
231 Gaia DR3 6497794385044427648 * 23 39 43.9222563960 -54 19 37.842940776           ~ 1 0
232 Gaia DR3 6497787714959163136 * 23 39 44.0454486552 -54 25 50.021000364           ~ 1 0
233 Gaia DR3 6497787891053843456 * 23 39 46.2158448408 -54 23 04.546726008           ~ 1 0
234 Gaia DR3 6497793766569104000 * 23 39 46.7509386936 -54 22 42.534325092           ~ 1 0
235 Gaia DR3 6497787852398122240 * 23 39 47.0637198888 -54 24 23.618989692           ~ 1 0
236 DES J233947.37-542445.8 * 23 39 47.4004793280 -54 24 45.946389384           ~ 2 0
237 Gaia DR3 6497794316324030336 * 23 39 48.8903683272 -54 19 41.552222592           ~ 1 0
238 Gaia DR3 6497786413584455936 * 23 39 49.1852827464 -54 28 46.900323264           ~ 1 0
239 Gaia DR3 6497793800927955712 * 23 39 49.2799676136 -54 21 51.594308964           ~ 1 0
240 Gaia DR3 6497786546728050688 * 23 39 51.3755346432 -54 27 41.005807668           ~ 1 0
241 Gaia DR3 6497786546728048896 * 23 39 52.3908650400 -54 28 02.069231628           ~ 1 0
242 Gaia DR3 6497787100779861504 * 23 39 52.9007387808 -54 24 45.473992704           ~ 1 0
243 Gaia DR3 6497786997701118336 * 23 39 54.0338188008 -54 25 59.595137616           ~ 1 0
244 Gaia DR3 6497787130843617024 * 23 39 54.5545322232 -54 24 18.678516228           ~ 1 0
245 Gaia DR3 6497787032059077888 * 23 39 55.2533007552 -54 25 19.905885156           ~ 1 0
246 Gaia DR3 6497786516663604480 * 23 39 55.4567706504 -54 27 46.382814360           ~ 1 0
247 DES J233955.77-542208.2 * 23 39 55.7963068776 -54 22 08.343636096           ~ 3 0
248 Gaia DR3 6497793560409502720 * 23 39 55.8192313200 -54 20 27.986271756           ~ 1 0
249 Gaia DR3 6497793143797835392 * 23 39 55.8848179776 -54 22 29.370922464           ~ 1 0
250 Gaia DR3 6497787032059680512 * 23 39 55.9066687440 -54 25 32.538103392           ~ 1 0
251 Gaia DR3 6497786344864318592 * 23 39 56.7147295296 -54 29 48.748452828           ~ 1 0
252 Gaia DR3 6497792941934493952 * 23 39 57.2096342592 -54 23 59.529506352           ~ 1 0
253 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
254 Gaia DR3 6497792937639400192 * 23 40 02.0346483408 -54 24 36.063941976           ~ 1 0
255 DES J234002.03-542226.1 * 23 40 02.0562231240 -54 22 26.291188308           ~ 2 0
256 Gaia DR3 6497786821605964288 * 23 40 02.2619377296 -54 26 15.316883304           ~ 1 0
257 Gaia DR3 6497786722822035072 * 23 40 03.0150768960 -54 26 49.272240984           ~ 1 0
258 Gaia DR3 6497792731480969472 * 23 40 03.3822606048 -54 24 45.645883956           ~ 1 0
259 Gaia DR3 6497792770135800320 * 23 40 03.4355709120 -54 23 55.292415900           ~ 1 0
260 Gaia DR3 6497793113733077632 * 23 40 03.6810573408 -54 22 09.520508820           ~ 1 0
261 Gaia DR3 6497786306209878272 * 23 40 04.1176114056 -54 28 38.888922288           ~ 1 0
262 Gaia DR3 6497793315596530944 * 23 40 05.5712999040 -54 21 00.826683372           ~ 1 0
263 Gaia DR3 6497793285531450880 * 23 40 07.0414714272 -54 21 48.018326940           ~ 1 0
264 Gaia DR3 6497786237490401664 * 23 40 07.5097741296 -54 28 29.981370144           ~ 1 0
265 DES J234007.86-542330.3 * 23 40 07.8860957832 -54 23 30.464566152           ~ 2 0
266 Gaia DR3 6497793457330564352 * 23 40 08.2359562224 -54 19 36.448741200           ~ 1 0
267 Gaia DR3 6497786752886483584 PM* 23 40 13.2667443288 -54 27 05.532424560           ~ 1 0
268 Gaia DR3 6497792838856165632 * 23 40 13.7321197608 -54 23 03.671179512           ~ 1 0
269 Gaia DR3 6497793354251347072 * 23 40 16.0318491984 -54 21 40.897935756           ~ 1 0
270 Gaia DR3 6497792834560188288 * 23 40 16.0673691528 -54 23 22.119665460           ~ 1 0
271 Gaia DR3 6497793246877051648 * 23 40 16.5621762840 -54 21 55.205118504           ~ 1 0
272 Gaia DR3 6497783836603404032 PM* 23 40 16.6091947440 -54 26 44.142613872           ~ 1 0
273 Gaia DR3 6497783664804926592 * 23 40 17.1722783880 -54 28 49.752704388           ~ 1 0
274 Gaia DR3 6497783699164594432 * 23 40 17.3039223936 -54 28 21.600198228           ~ 1 0
275 Gaia DR3 6497789746479713536 * 23 40 17.3063613000 -54 25 12.760960836           ~ 1 0
276 Gaia DR3 6497794866079833344 * 23 40 17.7185929128 -54 19 35.400733896           ~ 1 0
277 Gaia DR3 6497794866080727680 * 23 40 18.0872731752 -54 19 58.354337280           ~ 1 0
278 Gaia DR3 6497790429378507776 * 23 40 19.4250213696 -54 21 04.235796396           ~ 1 0
279 Gaia DR3 6497790399313420928 * 23 40 21.0665137416 -54 22 09.341012856           ~ 1 0
280 Gaia DR3 6497783832308723712 * 23 40 21.2398059336 -54 26 53.045857788           ~ 1 0
281 Gaia DR3 6497789879622685184 * 23 40 23.1472250280 -54 24 43.824796344           ~ 1 0
282 Gaia DR3 6497790188860333824 * 23 40 24.7176467904 -54 23 24.226405476           ~ 1 0
283 Gaia DR3 6497783767884477952 * 23 40 27.5742790920 -54 27 50.757005232           ~ 1 0
284 Gaia DR3 6497789643400968320 * 23 40 28.8189763224 -54 26 56.307604308           ~ 1 0
285 Gaia DR3 6497789437242067840 * 23 40 29.3047305072 -54 27 34.507176444           ~ 1 0
286 Gaia DR3 6497790227514789504 PM* 23 40 29.4454732176 -54 23 26.064601044           ~ 1 0
287 Gaia DR3 6497790158796570368 * 23 40 32.4444996168 -54 22 30.951280164           ~ 1 0
288 Gaia DR3 6497790021356861696 * 23 40 35.7756006792 -54 24 26.396802288           ~ 1 0
289 NAME Aquarius Region reg ~ ~           ~ 37 0

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