2018ApJ...855...43M

Query : 2018ApJ...855...43M

2018ApJ...855...43M - Astrophys. J., 855, 43-43 (2018/March-1)

Discovery of distant RR Lyrae stars in the Milky Way using DECam.

MEDINA G.E., MUNOZ R.R., VIVAS A.K., CARLIN J.L., FORSTER F., MARTINEZ J., GALBANY L., GONZALEZ-GAITAN S., HAMUY M., DE JAEGER T., MAUREIRA J.C. and MARTIN J.S.

Abstract (from CDS):

We report the discovery of distant RR Lyrae stars, including the most distant known in the Milky Way, using data taken in the g-band with the Dark Energy Camera as part of the High cadence Transient Survey (HiTS; 2014 campaign). We detect a total of 173 RR Lyrae stars over a ∼120 deg2 area, including both known RR Lyrae and new detections. The heliocentric distances dH of the full sample range from 9 to >200 kpc, with 18 of them beyond 90 kpc. We identify three sub-groups of RR Lyrae as members of known systems: the Sextans dwarf spheroidal galaxy, for which we report 46 new discoveries, and the ultra-faint dwarf galaxies Leo IV and Leo V. Following an MCMC methodology, we fit spherical and ellipsoidal profiles of the form ρ(R) ∼ Rn to the radial density distribution of RR Lyrae in the Galactic halo. The best fit corresponds to the spherical case, for which we obtain a simple power-law index of n=-4.17–0.20+0.18, consistent with recent studies made with samples covering shorter distances. The pulsational properties of the outermost RR Lyrae in the sample (dH > 90 kpc) differ from the ones in the halo population at closer distances. The distribution of the stars in a period-amplitude diagram suggest they belong to Oosterhoff-intermediate or Oosterhoff II groups, similar to what is found in the ultra-faint dwarf satellites around the Milky Way. The new distant stars discovered represent an important addition to the few existing tracers of the Milky Way potential in the outer halo.

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

Journal keyword(s): Galaxy: halo - Galaxy: stellar content - Galaxy: structure - stars: variables: RR Lyrae

VizieR on-line data: <Available at CDS (J/ApJ/855/43): table1.dat table5.dat table6.dat>

Nomenclature: Tables 1+5+6: HiTS JHHMMSS+DDMMSS N=173.

Simbad objects: 183

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Number of rows : 183
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 2MASS J09584461+0231183 RR* 09 58 44.6231887776 +02 31 18.024802212   18.270 17.79     ~ 6 0
5 FASTT 463 RR* 10 01 29.0191109544 +00 10 59.785240188   16.3 16.44     A0 15 0
6 FASTT 451 RR* 10 02 06.5499932016 +01 22 32.601905724     16.48     ~ 15 0
7 LINEAR 21298723 RR* 10 02 35.6635210536 +03 00 23.472021672     16.07     F5 16 0
8 HiTS J100815-021625 RR* 10 08 15.3071067840 -02 16 25.496231916           ~ 3 0
9 V* AK Sex RR* 10 08 37.6488733152 -02 03 12.561339348     17.30     ~ 10 0
10 HiTS J100843-041555 RR* 10 08 42.5633487219 -04 15 55.327578794     17.76     ~ 5 0
11 CRTS J100910.6-041231 RR* 10 09 10.7009302200 -04 12 31.086410904     17.70     ~ 7 0
12 HiTS J100936-015356 RR* 10 09 36.4784702448 -01 53 55.074506640           ~ 4 0
13 CRTS J100942.1+012900 RR* 10 09 42.1292784096 +01 29 02.405304456     18.44     ~ 11 0
14 HiTS J100956+013212 RR* 10 09 55.58 +01 32 11.9           ~ 2 0
15 HiTS J100958-015954 RR* 10 09 57.5742682104 -01 59 54.137261040   20.59       ~ 5 0
16 HiTS J101010-021303 RR* 10 10 09.9658815576 -02 13 03.412734348           ~ 2 0
17 HiTS J101011-012028 RR* 10 10 10.7246282592 -01 20 28.876739676           ~ 4 0
18 V* AL Sex RR* 10 10 14.2421088768 -02 01 13.942746480     16.73     ~ 16 0
19 HiTS J101035-014902 RR* 10 10 35.3255791248 -01 49 02.694820656           ~ 3 0
20 CRTS J101056.8-033322 RR* 10 10 56.8057302000 -03 33 23.037442092     19.71     ~ 3 0
21 HiTS J101059-014146 RR* 10 10 59.1311152632 -01 41 45.229704072           ~ 2 0
22 HiTS J101104-021031 RR* 10 11 03.9241652808 -02 10 31.877365476           ~ 4 0
23 2QZ J101109.9-022812 RR* 10 11 10.0096515504 -02 28 11.958863232           sdA 6 0
24 2QZ J101118.1-014125 RR* 10 11 18.1792250784 -01 41 24.505637676           ~ 2 0
25 2QZ J101122.5-013815 RR* 10 11 22.5843512832 -01 38 14.477903484   20.332       A2II 4 0
26 HiTS J101127-021833 RR* 10 11 26.9334872856 -02 18 33.629602572           ~ 3 0
27 HiTS J101137-013159 RR* 10 11 36.85 -01 31 58.6           ~ 1 0
28 HiTS J101146-014207 RR* 10 11 45.8883918072 -01 42 07.879019796   20.08 20.17     ~ 7 0
29 HiTS J101147-012921 RR* 10 11 46.6050566448 -01 29 20.141275452     20.74     ~ 5 0
30 HiTS J101149-023558 RR* 10 11 49.4437530048 -02 35 56.814523836           ~ 5 0
31 HiTS J101159-020215 RR* 10 11 58.5681862464 -02 02 16.563368436     19.98     ~ 4 0
32 2QZ J101159.2-014352 RR* 10 11 59.2113913464 -01 43 51.825966600           ~ 4 0
33 HiTS J101200-020233 RR* 10 11 59.6804349360 -02 02 33.741928176           ~ 6 0
34 HiTS J101214-014048 RR* 10 12 13.8712750560 -01 40 48.246293892     20.78     ~ 4 0
35 HiTS J101215-014921 RR* 10 12 14.6787659856 -01 49 19.841918052     20.18     ~ 4 0
36 HiTS J101215-015415 RR* 10 12 15.0703868736 -01 54 14.445893916           ~ 2 0
37 HiTS J101215-013710 RR* 10 12 15.2785086696 -01 37 09.596787024     20.59     ~ 4 0
38 HiTS J101216-020415 RR* 10 12 15.9519547296 -02 04 15.435209964           ~ 3 0
39 HiTS J101218-020021 RR* 10 12 17.5327765752 -02 00 21.427772472     20.14     ~ 4 0
40 HiTS J101219-014025 RR* 10 12 19.1267446536 -01 40 24.653239788     20.63     ~ 4 0
41 HiTS J101219-015445 RR* 10 12 19.5111421080 -01 54 44.747636076           ~ 3 0
42 HiTS J101220-014915 RR* 10 12 20.1702042720 -01 49 14.623188708           ~ 3 0
43 HiTS J101221-013733 RR* 10 12 20.5270181568 -01 37 32.193962796     20.35     ~ 3 0
44 HiTS J101223-015225 RR* 10 12 23.0694665712 -01 52 24.573660924           sdA 5 0
45 2QZ J101225.2-014319 RR* 10 12 25.2944230560 -01 43 18.272596008   19.96 20.20     ~ 7 0
46 HiTS J101243+022118 RR* 10 12 42.6159988176 +02 21 17.795349360           ~ 4 0
47 HiTS J101249-020327 RR* 10 12 48.7219364232 -02 03 26.646942348           ~ 3 0
48 HiTS J101309-020442 RR* 10 13 08.6363606208 -02 04 42.990939048     20.16     ~ 3 0
49 HiTS J101312-021412 RR* 10 13 12.0126221184 -02 14 12.605317512           ~ 4 0
50 HiTS J101316-020029 RR* 10 13 15.5897278488 -02 00 29.745295092           ~ 4 0
51 HiTS J101321-035610 RR* 10 13 20.6554818912 -03 56 09.066476220     18.55     ~ 4 0
52 HiTS J101333-003607 RR* 10 13 32.7280767336 -00 36 07.314857640           ~ 4 0
53 HiTS J101336-020026 RR* 10 13 36.0178348728 -02 00 26.800765668           ~ 3 0
54 SDSS J101336.42-013753.1 RR* 10 13 36.4200113808 -01 37 53.159691576   19.08 18.80     ~ 13 0
55 HiTS J101337-014947 RR* 10 13 36.9074279760 -01 49 47.601410088     20.26     ~ 3 0
56 HiTS J101339-014310 RR* 10 13 39.2289941472 -01 43 10.515098964   20.73 20.41     ~ 6 0
57 HiTS J101344-014845 RR* 10 13 43.6504180848 -01 48 45.302505228   20.74 20.39     ~ 6 0
58 HiTS J101345-014305 RR* 10 13 45.0406011576 -01 43 05.258749512   20.85 20.39     ~ 5 0
59 SDSS J101349.17-015042.5 RR* 10 13 49.1674195416 -01 50 42.502778304     20.19     sdA 4 0
60 HiTS J101353-035021 RR* 10 13 52.52 -03 50 20.8           ~ 1 0
61 HiTS J101356-004811 RR* 10 13 55.5175211928 -00 48 11.359114236           ~ 3 0
62 HiTS J101401-014046 RR* 10 14 00.7501683024 -01 40 46.074747180   20.53 20.29     sdA 6 0
63 SDSS J101402.55-013844.9 RR* 10 14 02.5528746792 -01 38 45.032455500   20.79 20.42     sdA 7 0
64 HiTS J101413-004502 RR* 10 14 12.7367597976 -00 45 02.274674688     20.05     ~ 5 0
65 HiTS J101413-014709 RR* 10 14 13.0482793824 -01 47 09.196795716     20.54     ~ 4 0
66 2QZ J101413.1-022107 RR* 10 14 13.1695025304 -02 21 06.869254896           ~ 4 0
67 HiTS J101414-013033 RR* 10 14 13.4900944968 -01 30 34.221638808     20.52     ~ 4 0
68 HiTS J101415-015358 RR* 10 14 15.1016780812 -01 53 57.518392199           ~ 2 0
69 HiTS J101417-015904 RR* 10 14 17.4206588592 -01 59 05.879174496   20.13       ~ 6 0
70 2QZ J101422.4-012722 RR* 10 14 22.4785618536 -01 27 21.449886156           ~ 3 0
71 HiTS J101426-014200 RR* 10 14 25.9530561840 -01 41 59.245858752     20.09     ~ 3 0
72 HiTS J101426-014048 RR* 10 14 26.1800549256 -01 40 47.676539820     20.27     ~ 7 0
73 HiTS J101428-014334 RR* 10 14 28.0066289832 -01 43 33.992596056   20.02       ~ 8 0
74 HiTS J101429-004613 RR* 10 14 28.8980493936 -00 46 13.375111008           ~ 3 0
75 HiTS J101446-012748 RR* 10 14 45.5580314184 -01 27 48.176857080           ~ 3 0
76 HiTS J101447-012724 RR* 10 14 46.8392758560 -01 27 24.230764512           ~ 2 0
77 V* AQ Sex RR* 10 14 52.4853323568 -00 26 35.357191692     17.97     ~ 12 0
78 HiTS J101500-013822 RR* 10 15 00.1353536808 -01 38 23.355940308           ~ 2 0
79 HiTS J101511-011825 RR* 10 15 10.7391742080 -01 18 25.721972352           ~ 3 0
80 HiTS J101514-013400 RR* 10 15 13.5659718360 -01 33 59.718550032           sdA 5 0
81 HiTS J101529-012126 RR* 10 15 28.7118482664 -01 21 25.911546804           ~ 4 0
82 HiTS J101551-013732 RR* 10 15 50.8708704696 -01 37 31.095618996           ~ 5 0
83 HiTS J101605-012847 RR* 10 16 04.4550792240 -01 28 47.189907012           sdA 4 0
84 ATO J154.1090-04.2827 RR* 10 16 26.1653915208 -04 16 57.809589996     17.51     ~ 8 0
85 2QZ J101626.3-013757 RR* 10 16 26.3497698024 -01 37 56.498532096           ~ 4 0
86 HiTS J101638-011903 RR* 10 16 38.39 -01 19 03.1           ~ 1 0
87 V* AT Sex RR* 10 17 50.0391138072 -02 01 27.009621552     16.50     ~ 15 0
88 V* AV Sex RR* 10 19 35.9145916224 -01 27 54.846341028     17.02     ~ 10 0
89 CRTS J101953.1-050552 RR* 10 19 53.1788388600 -05 05 52.430630172     19.10     ~ 4 0
90 CRTS J101957.1-020302 RR* 10 19 57.1403810472 -02 03 01.900621008     19.46     ~ 5 0
91 HiTS J102014-042354 RR* 10 20 13.89 -04 23 54.3           ~ 1 0
92 HiTS J102106-064439 RR* 10 21 06.1890147384 -06 44 39.014131308     18.77     ~ 5 0
93 HiTS J102306-080748 RR* 10 23 06.0726810120 -08 07 48.567995832     17.42     ~ 4 0
94 ATO J155.8030-08.4096 RR* 10 23 12.7365564960 -08 24 34.719098796     17.30     ~ 10 0
95 CRTS J102343.7-064234 RR* 10 23 43.6672790160 -06 42 33.648481008     17.95     ~ 6 0
96 HiTS J102414-095518 RR* 10 24 14.17 -09 55 18.5           ~ 2 0
97 CRTS J102609.7-083621 RR* 10 26 09.6683678496 -08 36 20.621049012     16.10     ~ 6 0
98 CRTS J103014.9-050203 RR* 10 30 14.9847919320 -05 02 03.337902348     17.12     ~ 8 0
99 HiTS J103601-015451 RR* 10 36 01.09 -01 54 51.2           ~ 1 0
100 ATO J159.1076-01.7841 RR* 10 36 25.8390842760 -01 47 02.764528404     15.85     ~ 10 0
101 ATO J159.4913-04.6585 RR* 10 37 57.9315837096 -04 39 30.711843504     17.72     ~ 10 0
102 ATO J159.8772-03.6770 RR* 10 39 30.5496473616 -03 40 37.175535984     16.92     ~ 6 0
103 HiTS J103943-021726 RR* 10 39 43.49 -02 17 26.2           ~ 2 0
104 HiTS J104009-063304 RR* 10 40 09.35 -06 33 03.8           ~ 2 0
105 HiTS J104054-042827 RR* 10 40 54.39 -04 28 27.3           ~ 1 0
106 ATO J161.0083-04.1115 RR* 10 44 02.0079224976 -04 06 41.377390236     17.29     ~ 5 0
107 ATO J161.0308-03.8882 RR* 10 44 07.3961084760 -03 53 17.524172724     17.88     ~ 5 0
108 LINEAR 22843222 RR* 10 44 22.9079982984 +01 17 22.123360680     16.23     ~ 13 0
109 CRTS J104427.3+024344 RR* 10 44 27.2701358112 +02 43 45.655289904     17.56     ~ 4 0
110 HiTS J104738+020627 RR* 10 47 37.72 +02 06 26.9           ~ 1 0
111 LINEAR 23325127 RR* 10 49 23.8466021976 -02 36 34.073496792     17.49     ~ 9 0
112 FASTT 501 RR* 10 51 42.2283972048 +00 16 10.846479000   17.08 16.41     ~ 15 0
113 LINEAR 23164890 RR* 10 51 52.2127428936 +02 13 37.821596088     16.02     ~ 10 0
114 HiTS J105209-043942 RR* 10 52 08.92 -04 39 42.3           ~ 1 0
115 CRTS J105212.9-043433 RR* 10 52 13.0192150896 -04 34 33.704785488     16.56     ~ 4 0
116 LINEAR 23157974 RR* 10 52 25.6656464064 +02 27 57.398771520     16.55     A0 9 0
117 ZTF J105311.17+015046.4 RR* 10 53 11.1799852680 +01 50 46.454808984     17.10     ~ 9 0
118 ATO J163.7563-02.9850 RR* 10 55 01.5341541096 -02 59 06.110361816     16.79     ~ 10 0
119 LINEAR 23166294 RR* 10 55 36.5927257296 +02 20 53.083948200     16.86     ~ 10 0
120 V* IP Leo RR* 10 55 44.7153510144 -01 30 21.674948580     16.38     ~ 9 0
121 HiTS J105545-013440 RR* 10 55 44.7730122342 -01 34 40.951163885   20.28 20.23     ~ 6 0
122 LINEAR 23163797 RR* 10 55 48.5403521688 +02 34 07.705705692     16.96     A0 10 0
123 V* IS Leo RR* 10 56 13.2567555000 -01 56 57.771023820     18.00     ~ 11 0
124 CRTS J105634.2+013336 RR* 10 56 34.3085036472 +01 33 36.228180276     17.99     ~ 13 0
125 CRTS J105725.5+024351 RR* 10 57 25.5889635240 +02 43 51.970283580     19.36     ~ 3 0
126 HiTS J105738+001316 RR* 10 57 38.4779774736 +00 13 15.864755016   18.32 17.93     ~ 7 0
127 HiTS J105754-002603 RR* 10 57 54.18 -00 26 02.5           ~ 1 0
128 ZTF J105842.53+023123.7 RR* 10 58 42.5369161536 +02 31 23.711401416     17.79     F5 11 0
129 LINEAR 23511195 RR* 10 59 33.0164780088 +02 06 16.395827868     16.87     ~ 10 0
130 HiTS J110117-035105 RR* 11 01 16.86 -03 51 05.1           ~ 1 0
131 ATO J165.4997+00.8899 RR* 11 01 59.9304284893 +00 53 23.904929470     17.10     ~ 5 0
132 HiTS J110222-001624 RR* 11 02 22.20 -00 16 24.1           ~ 1 0
133 LINEAR 23507500 RR* 11 02 43.2867312336 +01 48 20.463600600     17.02     ~ 8 0
134 CRTS J110253.9-003414 RR* 11 02 54.0101228880 -00 34 14.889160920     17.37     A0 10 0
135 LINEAR 23843949 RR* 11 04 55.6687050840 +01 57 45.007762032     17.15     A0 13 0
136 HiTS J110510-022710 RR* 11 05 09.56 -02 27 10.2           ~ 1 0
137 LINEAR 23847927 RR* 11 06 15.5334776160 +01 51 18.827824320     16.30     A0 11 1
138 HiTS J110739+012813 RR* 11 07 39.32 +01 28 13.3           ~ 1 0
139 LINEAR 23846316 RR* 11 08 28.7185700496 +01 38 50.271511560     16.45     ~ 13 0
140 ZTF J111033.25-032935.1 RR* 11 10 33.2493007704 -03 29 35.192402268     15.54     ~ 11 0
141 HiTS J111106-041718 RR* 11 11 06.03 -04 17 18.0           ~ 1 0
142 ATO J168.1925-04.6112 RR* 11 12 46.2063269832 -04 36 40.299550920     16.46     ~ 6 0
143 LINEAR 24192071 RR* 11 13 10.7260465416 +02 51 08.501889672     16.26     A0 12 0
144 V* KN Leo RR* 11 13 42.2943630480 -02 19 22.129679280     17.36     ~ 11 0
145 CRTS J111419.7+024909 RR* 11 14 19.8199415592 +02 49 10.245909792     17.58     ~ 12 0
146 HiTS J111522-025143 RR* 11 15 22.1917172352 -02 51 42.832815480           ~ 8 0
147 ZTF J111721.54+022619.6 RR* 11 17 21.5428746144 +02 26 19.642694280     17.11     ~ 13 0
148 ATO J169.8933-04.2946 RR* 11 19 34.4078856216 -04 17 40.659089280     15.61     ~ 10 0
149 V* KQ Leo RR* 11 19 59.7132181584 -00 38 31.745734152     16.55     ~ 11 0
150 CRTS J112038.6-040701 RR* 11 20 38.6760071448 -04 07 01.568024472   16.2 16.08     ~ 11 0
151 V* KS Leo RR* 11 20 57.4838020344 -02 03 26.653044348     16.48     ~ 14 0
152 ZTF J112445.14+013726.2 RR* 11 24 45.1469524896 +01 37 26.190813036     18.07     ~ 13 0
153 HiTS J112524-024348 RR* 11 25 24.12 -02 43 48.0           ~ 2 0
154 CRTS J112548.7-041215 RR* 11 25 48.8136190104 -04 12 15.207330564     15.36     ~ 11 0
155 ATO J172.0304-03.7925 RR* 11 28 07.3162219008 -03 47 33.281318328     17.86     ~ 7 0
156 CRTS J112820.4-000638 RR* 11 28 20.4298426608 -00 06 36.904355568   19.86 19.21     ~ 13 0
157 V* KY Leo RR* 11 28 37.7330797848 -00 01 12.555790104     18.91     sdA 19 0
158 HiTS J112859-034415 RR* 11 28 59.12 -03 44 15.4           ~ 1 0
159 HiTS J113006+001108 RR* 11 30 05.7465902832 +00 11 07.882500480   18.25 17.86     ~ 5 0
160 HiTS J113057+021330 RR* 11 30 57.47 +02 13 30.5           ~ 4 0
161 HiTS J113105+021319 RR* 11 31 04.65 +02 13 19.2           ~ 3 0
162 ZTF J113106.64+023024.5 RR* 11 31 06.6397043760 +02 30 24.435413784     18.27     ~ 10 0
163 HiTS J113107+021302 * 11 31 06.6 +02 13 02           ~ 4 0
164 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
165 ZTF J113217.38-035542.0 RR* 11 32 17.3843344584 -03 55 42.148278912     17.72     ~ 10 0
166 [MDR2009] V2 RR* 11 32 55.82 -00 33 29.8   21.86 21.46     ~ 6 0
167 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
168 [MDR2009] V1 RR* 11 32 59.19936 -00 34 04.1448   21.82 21.47     ~ 3 0
169 ZTF J113313.79+022238.1 RR* 11 33 13.7921525832 +02 22 38.078689836     17.46     F5 14 0
170 LINEAR 1588548 RR* 11 33 35.6515177032 -01 10 12.656753904     16.90     A0 14 0
171 LINEAR 1435297 RR* 11 33 52.6622122992 +01 08 16.056963924     17.09     ~ 14 0
172 ZTF J113359.64+024752.6 RR* 11 33 59.6490256128 +02 47 52.523994444     18.54     ~ 11 0
173 ZTF J113559.94+021832.8 RR* 11 35 59.9516612664 +02 18 32.837122188     17.70     ~ 13 0
174 LINEAR 1786397 RR* 11 36 08.7442257864 +02 58 33.588698628     17.57     ~ 10 0
175 ZTF J113633.69-012016.8 RR* 11 36 33.6997830384 -01 20 16.935944280     18.57     F0III 14 0
176 V* LP Leo RR* 11 36 39.7966120344 -01 25 16.623039792     16.77     A0 18 0
177 LINEAR 1925869 RR* 11 36 53.0616973152 -02 46 29.198096400     16.69     A0 13 0
178 LINEAR 1932680 RR* 11 37 48.0497496672 -02 18 17.461264608     16.79     ~ 12 0
179 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
180 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
181 NAME Pisces Overdensity G 23 19.0 +00 00           ~ 65 0
182 NAME Local Group GrG ~ ~           ~ 9325 0
183 NAME Virgo Stellar Stream MGr ~ ~           ~ 110 0

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