2018MNRAS.476.3913S

Query : 2018MNRAS.476.3913S

2018MNRAS.476.3913S - Mon. Not. R. Astron. Soc., 476, 3913-3923 (2018/May-3)

Spectroscopic follow-up of the Hercules-Aquila Cloud.

SIMION I.T., BELOKUROV V., KOPOSOV S.E., SHEFFIELD A. and JOHNSTON K.V.

Abstract (from CDS):

We designed a follow-up program to find the spectroscopic properties of the Hercules-Aquila Cloud (HAC) and test scenarios for its formation. We measured the radial velocities (RVs) of 45 RR Lyrae in the southern portion of the HAC using the facilities at the MDM observatory, producing the first large sample of velocities in the HAC. We found a double-peaked distribution in RVs, skewed slightly to negative velocities. We compared both the morphology of HAC projected on to the plane of the sky and the distribution of velocities in this structure outlined by RR Lyrae and other tracer populations at different distances to N-body simulations. We found that the behaviour is characteristic of an old, well-mixed accretion event with small apo-galactic radius. We cannot yet rule out other formation mechanisms for the HAC. However, if our interpretation is correct, HAC represents just a small portion of a much larger debris structure spread throughout the inner Galaxy whose distinct kinematic structure should be apparent in RV studies along many lines of sight.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: formation - Galaxy: halo - Galaxy: structure - galaxies: individual: Milky Way

CDS comments: RR Lyrae in table 2 come from 2013ApJ...763...32D; the corresponding acronym is [DCD2013] CSS JHHMMSS.s+DDMMSS. Thus the new names "HACNNN" given here by the authors will not be added in Simbad.

Simbad objects: 65

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Number of rows : 65
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 TriAnd2 Cld 01 02 +43.           ~ 23 0
2 NAME TriAnd1 Cld 01 24 +37.           ~ 19 0
3 NAME EriPhe Overdensity G 01 54 -55.0           ~ 30 0
4 NGC 747 EmG 01 57 30.4581747144 -09 27 44.519785956   14   13.26   ~ 39 0
5 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 NAME Hercules Aquila Cloud reg 19 04 +06.3           ~ 138 0
8 ATO J307.7044-05.5086 RR* 20 30 49.0715863968 -05 30 31.106915640     16.72     ~ 11 0
9 [DCD2013] CSS J203128.3-094820 RR* 20 31 28.3256250576 -09 48 20.393726940     16.56     ~ 9 0
10 2MASS J20322044-1349263 RR* 20 32 20.4731043600 -13 49 26.362975476     16.93     ~ 8 0
11 ATO J310.0705-06.3516 RR* 20 40 16.9388213160 -06 21 05.968814796     16.37     ~ 14 0
12 ATO J310.0809-06.1609 RR* 20 40 19.4154666000 -06 09 39.485752740     16.72     ~ 12 0
13 ATO J310.5762-09.6704 RR* 20 42 18.3084716568 -09 40 13.361232360     16.65     ~ 13 0
14 ATO J310.6842-15.8722 RR* 20 42 44.2131779568 -15 52 20.131727592     16.94     ~ 16 0
15 ZTF J204606.52-000802.1 RR* 20 46 06.5261485728 -00 08 02.182387704     16.762     ~ 15 0
16 ATO J311.8009-09.3490 RR* 20 47 12.2235941592 -09 20 56.377393116     17.03     ~ 11 0
17 ZTF J204713.22-110209.4 RR* 20 47 13.2248121840 -11 02 09.501657720     16.70     ~ 9 0
18 ATO J312.1075-03.8393 RR* 20 48 25.8156410952 -03 50 21.496242984     16.78     ~ 12 0
19 ZTF J204929.46+021818.4 RR* 20 49 29.4666213048 +02 18 18.332675172     16.90     ~ 9 0
20 ZTF J205004.30-082432.9 RR* 20 50 04.3087077888 -08 24 32.878084824     16.68     ~ 12 0
21 ZTF J205121.81+071123.1 RR* 20 51 21.8127533496 +07 11 23.121561408     17.05     ~ 9 0
22 WVSC 99 RR* 20 52 25.3282615944 +06 15 00.203238540     16.95     ~ 10 0
23 ATO J313.1760-01.1648 RR* 20 52 42.2478576624 -01 09 53.220856104     16.687     ~ 14 0
24 Cl* NGC 6981 SAW V35 RR* 20 53 43.5554250720 -12 31 52.479707916   17.25 16.89   16.37 ~ 18 0
25 ATO J313.4505-04.6575 RR* 20 53 48.1205336064 -04 39 27.147900492     16.91     ~ 8 0
26 ATO J313.5932-14.3477 RR* 20 54 22.3782461136 -14 20 52.007377560     16.63     ~ 11 0
27 ATO J314.3615-07.0398 RR* 20 57 26.7625013304 -07 02 23.357706576     16.67     ~ 11 0
28 ATO J314.5908-02.8933 RR* 20 58 21.8015244456 -02 53 35.837475828     16.99     ~ 11 0
29 ATO J314.8483-12.5544 RR* 20 59 23.6040034104 -12 33 15.912618804     16.97     ~ 14 0
30 ZTF J210008.65+002702.1 RR* 21 00 08.6953791720 +00 27 01.963945836     16.675     ~ 15 0
31 ZTF J210042.10+030435.9 RR* 21 00 42.1089057192 +03 04 35.923150056     16.98     ~ 10 0
32 ZTF J210130.29-111115.7 RR* 21 01 30.3003360192 -11 11 15.831119184     16.95     ~ 10 0
33 ATO J315.9205-13.0186 RR* 21 03 40.9363988400 -13 01 07.239813888     16.89     ~ 13 0
34 ATO J316.7139-00.8093 RR* 21 06 51.3365577264 -00 48 33.719342076     16.571     ~ 11 0
35 2MASS J21070062-0039523 RR* 21 07 00.6093465744 -00 39 52.366481604     16.381     A0 13 0
36 ATO J317.1291-13.4842 RR* 21 08 30.9822471360 -13 29 03.208072560     16.74     ~ 12 0
37 ATO J317.2721-04.5789 RR* 21 09 05.3118523896 -04 34 44.229326376     16.74     ~ 6 0
38 ATO J317.9844-08.5442 RR* 21 11 56.2570243858 -08 32 39.116089973     17.05     ~ 10 0
39 ZTF J211309.18+033149.7 RR* 21 13 09.1852953672 +03 31 49.623429504     16.95     ~ 8 0
40 ATO J318.6157-16.3178 RR* 21 14 27.7861638408 -16 19 04.249480908     16.69     ~ 11 0
41 ATO J318.7192-16.0924 RR* 21 14 52.6139075232 -16 05 32.632015884     16.78     ~ 9 0
42 ATO J318.7579-01.9440 RR* 21 15 01.8957019656 -01 56 38.384188908     16.82     ~ 11 0
43 ATO J319.1650-05.0630 RR* 21 16 39.6074085984 -05 03 46.879633008     16.94     ~ 9 0
44 ATO J319.4762-00.2822 RR* 21 17 54.3014738592 -00 16 55.886470896     16.742     A0 10 0
45 ATO J321.2613-00.1945 RR* 21 25 02.7175766496 -00 11 40.251874992     16.744     ~ 15 0
46 ZTF J212535.47-081709.7 RR* 21 25 35.5055003208 -08 17 09.266989776     16.71     ~ 7 0
47 ATO J322.1851+01.4229 RR* 21 28 44.4365968536 +01 25 22.464384204     16.78     ~ 12 0
48 ATO J322.2153-16.2157 RR* 21 28 51.6754205520 -16 12 56.603002464     16.94 16.71   ~ 9 0
49 ATO J322.5188-09.5652 RR* 21 30 04.5169528392 -09 33 54.765731916     16.75     ~ 12 0
50 ATO J322.5319-05.9798 RR* 21 30 07.6757125416 -05 58 47.468866692     16.90     ~ 8 0
51 ATO J322.8445-10.1356 RR* 21 31 22.6965099576 -10 08 08.091475584     16.88     ~ 8 0
52 ZTF J213215.00-121057.4 RR* 21 32 15.0053864640 -12 10 57.510474852     17.511     ~ 11 0
53 ATO J323.5459-02.1662 RR* 21 34 11.0302647312 -02 09 58.407002676     16.98     ~ 9 0
54 ATO J324.4688-02.2512 RR* 21 37 52.5133961448 -02 15 04.307922540     16.66     ~ 8 0
55 ATO J326.1226-07.4877 RR* 21 44 29.4259041624 -07 29 16.007087724     16.62     F5 15 0
56 ZTF J214513.88-082202.8 RR* 21 45 13.8899363664 -08 22 02.880817644     16.79     ~ 9 0
57 ATO J326.8428-02.6991 RR* 21 47 22.2747200760 -02 41 56.764684860     16.78     ~ 9 0
58 ATO J327.1676-03.4615 RR* 21 48 40.2468853200 -03 27 41.642735004     16.61     ~ 9 0
59 ATO J327.2896-05.0996 RR* 21 49 09.5017814544 -05 05 58.801056396   17.29 16.90 16.89 16.50 ~ 14 0
60 ATO J327.8358-03.8525 RR* 21 51 20.5997710632 -03 51 09.050006088     16.93     ~ 12 0
61 ATO J327.9146-11.2384 RR* 21 51 39.5207183640 -11 14 18.249220032     16.63     ~ 10 0
62 ATO J328.2794-05.4309 RR* 21 53 07.0545414216 -05 25 51.202469856     16.58     ~ 8 0
63 NGC 7600 AG? 23 18 53.8425354720 -07 34 49.679666040   13   11.68   ~ 74 0
64 NAME Pisces Overdensity G 23 19.0 +00 00           ~ 65 0
65 NAME Virgo Stellar Stream MGr ~ ~           ~ 110 0

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