2017MNRAS.468.1349P

Query : 2017MNRAS.468.1349P

2017MNRAS.468.1349P - Mon. Not. R. Astron. Soc., 468, 1349-1360 (2017/June-3)

A stellar overdensity associated with the Small Magellanic Cloud.

PIERES A., SANTIAGO B.X., DRLICA-WAGNER A., BECHTOL K., VAN DER MAREL R.P., BESLA G., MARTIN N.F., BELOKUROV V., GALLART C., MARTINEZ-DELGADO D., MARSHALL J., NOEL N.E.D., MAJEWSKI S.R., CIONI M.-R.L., LI T.S., HARTLEY W., LUQUE E., CONN B.C., WALKER A.R., BALBINOT E., STRINGFELLOW G.S., OLSEN K.A.G., NIDEVER D., DA COSTA L.N., OGANDO R., MAIA M., NETO A.F., ABBOTT T.M.C., ABDALLA F.B., ALLAM S., ANNIS J., BENOIT-LEVY A., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DESAI S., DIEHL H.T., DOEL P., FLAUGHER B., FOSALBA P., GARCIA-BELLIDO J., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HONSCHEID K., JAMES D., KUEHN K., KUROPATKIN N., MENANTEAU F., MIQUEL R., PLAZAS A.A., ROMER A.K., SAKO M., SANCHEZ E., SCARPINE V., SCHUBNELL M., SEVILLA-NOARBE I., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., TUCKER D.L. and WESTER W.

Abstract (from CDS):

We report the discovery of a stellar overdensity 8° north of the centre of the Small Magellanic Cloud (SMC; Small Magellanic Cloud Northern Over-Density; SMCNOD), using data from the first 2 yr of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS). The SMCNOD is indistinguishable in age, metallicity and distance from the nearby SMC stars, being primarily composed of intermediate-age stars (6 Gyr, Z=0.001), with a small fraction of young stars (1 Gyr, Z=0.01). The SMCNOD has an elongated shape with an ellipticity of 0.6 and a size of ∼ 6° x 2°. It has an absolute magnitude of MV [?] -7.7, rh = 2.1 kpc, and µV(r < rh) = 31.2 mag arcsec–2. We estimate a stellar mass of ∼105 M☉, following a Kroupa mass function. The SMCNOD was probably removed from the SMC disc by tidal stripping, since it is located near the head of the Magellanic Stream, and the literature indicates likely recent Large Magellanic Cloud-SMC encounters. This scenario is supported by the lack of significant H I gas. Other potential scenarios for the SMCNOD origin are a transient overdensity within the SMC tidal radius or a primordial SMC satellite in advanced stage of disruption.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: interactions - Magellanic Clouds - Magellanic Clouds

Nomenclature: NAME Small Magellanic Cloud Northern Over-Density N=1.

Simbad objects: 30

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Number of rows : 30
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 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
4 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 480 2
5 NAME SMC Northern Overdensity St* 00 48 00 -64 48.0           ~ 15 0
6 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
8 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
9 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
10 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
11 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
12 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
13 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
14 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
15 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
16 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
17 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
18 NGC 1395 SyG 03 38 29.789 -23 01 39.69   10.71   8.99   ~ 289 0
19 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
20 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
21 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 229 0
22 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
23 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
24 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
25 Z 349-23 AG? 08 25 02.408 +74 25 58.03   14.9       ~ 36 0
26 NAME Magellanic Leading Arm reg 11 26 -82.0           ~ 105 0
27 LEDA 43211 LSB 12 47 59.92392 +10 58 14.8966   21       ~ 83 0
28 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
29 NGC 6287 GlC 17 05 09.4906767360 -22 42 28.099250172   11.49 10.30     ~ 240 0
30 NAME Local Group GrG ~ ~           ~ 9325 0

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