2007ApJ...670..346C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET01:03:41

2007ApJ...670..346C - Astrophys. J., 670, 346-362 (2007/November-3)

A 2MASS all-sky view of the Sagittarius dwarf galaxy. V. Variation of the metallicity distribution function along the Sagittarius stream.

CHOU M.-Y., MAJEWSKI S.R., CUNHA K., SMITH V.V., PATTERSON R.J., MARTINEZ-DELGADO D., LAW D.R., CRANE J.D., MUNOZ R.R., GARCIA LOPEZ R., GEISLER D. and SKRUTSKIE M.F.

Abstract (from CDS):

We present reliable measurements of the metallicity distribution function (MDF) at different points along the tidal stream of the Sagittarius (Sgr) dwarf spheroidal (dSph) galaxy, based on high-resolution, echelle spectroscopy of candidate M giant members of the Sgr system. The Sgr MDF is found to evolve significantly from a median [Fe/H]~-0.4 in the core to ~-1.1 dex over a Sgr leading arm length representing ∼2.5-3.0 Gyr of dynamical (i.e., tidal stripping) age. This is direct evidence that there can be significant chemical differences between current dSph satellites and the bulk of the stars they have contributed to the halo. Our results suggest that Sgr experienced a significant change in binding energy over the past several gigayears, which has substantially decreased its tidal boundary across a radial range over which there must have been a significant metallicity gradient in the progenitor galaxy. By accounting for MDF variation along the debris arms, we approximate the MDF Sgr would have had several gigayears ago. We also analyze the MDF of a moving group of M giants we previously discovered toward the north Galactic cap. These objects have the opposite radial velocities to the infalling Sgr leading arm stars there, and we propose that most of them represent Sgr trailing arm stars overlapping the Sgr leading arm in this part of the sky. If so, these trailing arm stars further demonstrate the strong MDF evolution within the Sgr stream.

Abstract Copyright:

Journal keyword(s): Galaxies: Evolution - Galaxies: Interactions - Galaxy: Halo - Galaxies: Local Group

VizieR on-line data: <Available at CDS (J/ApJ/670/346): table1.dat table3.dat table7.dat>

Simbad objects: 77

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Number of rows : 77

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10659 1
2 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 502 0
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1074 4
4 * bet And PM* 01 09 43.92388 +35 37 14.0075 5.58 3.62 2.05 0.81 -0.19 M0+IIIa 530 0
5 NAME Sgr Stream St* 02 22 +00.0           ~ 621 0
6 * rho Per LP* 03 05 10.59385 +38 50 24.9943 6.83 5.04 3.39 1.59 -0.03 M4+IIIa 306 0
7 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1174 1
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14457 1
9 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 964 0
10 2MASS J09192157+2023047 * 09 19 21.5780004936 +20 23 04.747776987           ~ 2 0
11 2MASS J09253639+2138065 * 09 25 36.3804071956 +21 38 06.578126375           ~ 2 0
12 2MASS J10330452+4916039 LP* 10 33 04.5196342873 +49 16 03.914214212           ~ 3 0
13 [LLC2016] Vel-3+83 5 * 10 34 39.5165319182 +24 52 05.564130544           ~ 4 0
14 2MASS J10414792+2949167 * 10 41 47.9245557085 +29 49 16.854843803           ~ 3 0
15 2MASS J10513018+0043595 * 10 51 30.1940890924 +00 43 59.542936539           ~ 3 0
16 [LLC2016] Vel-3+83 8 * 11 00 51.6443506155 +13 02 16.116562300           ~ 4 0
17 2MASS J11011118+1913113 * 11 01 11.1813048340 +19 13 11.235370997           ~ 2 0
18 BD+07 2424 * 11 11 49.2625621276 +06 39 15.007842167   12.10 10.49     M0 2 0
19 BD+02 2400 * 11 12 47.9561565955 +01 32 11.278087075   11.35 9.60     K5 2 0
20 2MASS J11145729-2151256 * 11 14 57.2936480933 -21 51 25.661764015           ~ 2 0
21 2MASS J11153761+0008004 RG* 11 15 37.6142727164 +00 08 00.550473284   14.24 12.68 12.18   M 8 0
22 2MASS J11161175-3330571 * 11 16 11.7635805706 -33 30 57.026709697           ~ 2 0
23 BD-02 3352 * 11 28 31.5795761381 -03 16 47.043336757   11.24 9.43     K5 2 0
24 TYC 4930-758-1 * 11 35 38.7781809082 -02 26 02.366599451   11.669 10.151     ~ 3 0
25 2MASS J11402262-1925001 * 11 40 22.6282501763 -19 25 00.195630919           ~ 2 0
26 TYC 5519-1274-1 * 12 08 10.1447152911 -09 07 52.855964764   12.770 11.049     ~ 3 0
27 2MASS J12141900+0713579 * 12 14 19.0041442043 +07 13 57.795126953           ~ 2 0
28 BD-06 3562 * 12 23 59.0292910648 -07 30 27.846102996   11.47 9.95     ~ 2 0
29 TYC 4947-325-1 * 12 24 25.5121876104 -06 18 52.012942453   12.575 10.984     ~ 3 0
30 HD 108455 * 12 27 36.7117847484 -03 18 33.624293461   10.72 9.32     K3(III) 4 0
31 HD 109732 * 12 36 54.9051034083 -00 29 41.215141175   11.0 9.38     K5/M0(III) 4 0
32 2MASS J12490781+0844553 * 12 49 07.8207660081 +08 44 55.289913342           ~ 2 0
33 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 990 0
34 2MASS J12570130+2600457 LP* 12 57 01.3078230555 +26 00 45.790228327           ~ 3 0
35 2MASS J13184998+0611121 * 13 18 49.9705681060 +06 11 12.263726205   14.8 13.8     ~ 3 0
36 MGC 44538 * 13 19 36.8237104351 -00 08 17.400429128   14.33       ~ 3 0
37 2MASS J13304716-2118473 * 13 30 47.1749414468 -21 18 47.470204903   13.982 12.407     ~ 3 0
38 2MASS J13345316+0420526 * 13 34 53.1732813383 +04 20 52.668710361           ~ 2 0
39 2MASS J13430468+2216363 * 13 43 04.6951941942 +22 16 36.303149407           ~ 2 0
40 BD+22 2634 * 13 48 36.6529114772 +22 01 00.711383159   11.47 9.71     K2 2 0
41 TYC 322-59-1 * 14 07 06.0285152632 +06 33 11.040701118   12.38 10.76     ~ 2 0
42 RAVE J141122.0-061013 * 14 11 22.0416141559 -06 10 13.085776368   15.446 13.867 12.55 11.866 ~ 7 0
43 TYC 2013-37-1 * 14 12 16.1289493424 +29 43 03.069837759   12.27 11.00     ~ 2 0
44 * 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 2109 0
45 TYC 3038-108-1 * 14 24 42.5216832001 +41 49 31.817251020   11.86 10.25     ~ 2 0
46 2MASS J14294564+2300432 * 14 29 45.6486781375 +23 00 43.286858189           ~ 2 0
47 BD+07 2808 * 14 35 01.7710581840 +07 08 26.859167021   11.33 9.76     M2 2 0
48 2MASS J14505444+2443573 * 14 50 54.4520908841 +24 43 57.401337648           ~ 2 0
49 2MASS J14561366+1511121 * 14 56 13.6635784516 +15 11 12.160701893           ~ 2 0
50 2MASS J15121421-0752500 * 15 12 14.2106747320 -07 52 50.031842562           ~ 2 0
51 TYC 1492-826-1 * 15 13 01.0788062383 +22 26 39.663986109   13.93 11.42     ~ 2 0
52 2MASS J15365019+5800174 * 15 36 50.1963429331 +58 00 17.388492263           ~ 2 0
53 2MASS J15384716+4942175 * 15 38 47.1439163311 +49 42 17.216603025           ~ 2 0
54 2MASS J15451890+2913099 LP* 15 45 18.9080918526 +29 13 10.013499699           ~ 4 0
55 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11155 0
56 2MASS J18492221-2932173 * 18 49 22.2122113482 -29 32 17.268517447           MIII 2 0
57 2MASS J18533326-3201456 * 18 53 33.2682389086 -32 01 45.695089038           MIII 3 0
58 [IG95] 62-10 * 18 54 28.2866003960 -29 57 39.894387524   17.63   15.02   MIII 4 0
59 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1668 2
60 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 867 0
61 2MASS J18553412-3020551 * 18 55 34.1231401552 -30 20 55.242807705           MIII 5 0
62 2MASS J18555559-2933163 * 18 55 55.599 -29 33 16.33           MIII 2 0
63 2MASS J19021348-3130298 * 19 02 13.4940548293 -31 30 29.991265774           MIII 2 0
64 2MASS J20313337-3244528 RB? 20 31 33.3690236214 -32 44 52.858375239           M 3 0
65 2MASS J20371961-2917378 * 20 37 19.6119859863 -29 17 37.839496733   14.1 12.7     ~ 3 0
66 2MASS J20463353-2835473 * 20 46 33.5377696927 -28 35 47.301436220   15.8 14.5     ~ 3 0
67 2MASS J20500201-3453357 * 20 50 02.0184059715 -34 53 35.803310478   12.7 11.9     ~ 3 0
68 2MASS J21055853-2756021 * 21 05 58.5441748859 -27 56 02.211450244           ~ 2 0
69 2MASS J21144121-3012560 * 21 14 41.2264418581 -30 12 56.026043552   14.6 13.2     ~ 3 0
70 2MASS J21304448-2100339 * 21 30 44.4917944644 -21 00 33.983396068   14.0 13.0     ~ 3 0
71 2MASS J21351833-2034569 * 21 35 18.3391411576 -20 34 56.849471841   14.2 13.4     ~ 3 0
72 2MASS J21544711-2240500 * 21 54 47.1148536908 -22 40 49.969724811   13.7 12.8     ~ 3 0
73 2MASS J22263275-3404084 RB? 22 26 32.7654681205 -34 04 08.504688126   16.4 15.5     M 4 0
74 * bet Peg LP* 23 03 46.45746 +28 04 58.0336 6.05 4.09 2.42 0.92 -0.40 M2.5II-III 576 0
75 NAME Local Group GrG ~ ~           ~ 6752 0
76 NAME Galactic Bulge reg ~ ~           ~ 3276 0
77 NAME Monoceros Stream St* ~ ~           ~ 306 0

    Equat.    Gal    SGal    Ecl

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2020.01.20-01:03:41

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