2017MNRAS.465.2189B

Query : 2017MNRAS.465.2189B

2017MNRAS.465.2189B - Mon. Not. R. Astron. Soc., 465, 2189-2197 (2017/February-3)

A very dark stellar system lost in Virgo: kinematics and metallicity of SECCO 1 with MUSE.

BECCARI G., BELLAZZINI M., MAGRINI L., COCCATO L., CRESCI G., FRATERNALI F., DE ZEEUW P.T., HUSEMANN B., IBATA R., BATTAGLIA G., MARTIN N., TESTA V., PERINA S. and CORRENTI M.

Abstract (from CDS):

We present the results of VLT-MUSE (Very Large Telescope-Multi Unit Spectroscopic Explorer) integral field spectroscopy of SECCO 1, a faint, star-forming stellar system recently discovered as the stellar counterpart of an ultracompact high-velocity cloud (HVC 274.68+74.0), very likely residing within a substructure of the Virgo cluster of galaxies. We have obtained the radial velocity of a total of 38 individual compact sources identified as H II regions in the main and secondary bodies of the system, and derived the metallicity for 18 of them. We provide the first direct demonstration that the two stellar bodies of SECCO 1 are physically associated and that their velocities match the H I velocities. The metallicity is quite uniform over the whole system, with a dispersion lower than the uncertainty on individual metallicity estimates. The mean abundance, <12 + log(O/H)> = 8.44, is much higher than the typical values for local dwarf galaxies of similar stellar mass. This strongly suggests that the SECCO 1 stars were born from a pre-enriched gas cloud, possibly stripped from a larger galaxy. Using archival Hubble Space Telescope (HST) images, we derive a total stellar mass of ≃1.6 x 105 M☉ for SECCO 1, confirming that it has a very high H I-to-stellar mass ratio for a dwarf galaxy, M_ H  I/M*_ ∼ 100. The star formation rate, derived from the Hα flux, is a factor of more than 10 higher than in typical dwarf galaxies of similar luminosity.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): H ii regions - galaxies: dwarf - galaxies: star formation - galaxies: star formation

Nomenclature: Table 1: [BBM2017] MBNN N=26 among (Nos MB14-MB68), [BBM2017] SBNN N=12 among (Nos SB01-SB45).

Errata: erratum vol. 468, p. 4254 (2017)

Simbad objects: 49

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Number of rows : 49
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 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 NAME Virgo LVC Cloud GrG 12 16.0 +13 24           ~ 11 0
4 NGC 4294 GiC 12 21 17.787 +11 30 39.99   12.6       ~ 320 0
5 NGC 4299 GiC 12 21 40.548 +11 29 59.74   12.8       ~ 271 0
6 [BBM2017] MB14 HII 12 21 53.50 +13 27 26.4           ~ 1 0
7 [BBM2017] MB64 HII 12 21 53.52 +13 27 33.9           ~ 1 0
8 AGC 229490 G 12 21 53.6 +13 27 32           ~ 4 0
9 [BBM2017] MB63 HII 12 21 53.64 +13 27 27.1           ~ 1 0
10 [BBM2017] MB15 HII 12 21 53.66 +13 27 28.2           ~ 1 0
11 [BBM2017] MB60 HII 12 21 53.73 +13 27 41.0           ~ 1 0
12 [BBM2017] MB31 HII 12 21 53.86 +13 27 42.9           ~ 1 0
13 [BBM2017] MB34 HII 12 21 53.93 +13 27 45.7           ~ 1 0
14 [BBM2017] MB58 HII 12 21 53.94 +13 27 31.3           ~ 1 0
15 SECCO 1 G 12 21 53.96 +13 27 36.5     19.9     ~ 26 0
16 [BBM2017] MB61 HII 12 21 54.03 +13 27 41.4           ~ 2 0
17 [BBM2017] MB33 HII 12 21 54.04 +13 27 44.8           ~ 1 0
18 [BBM2017] MB59 HII 12 21 54.04 +13 27 38.3           ~ 2 0
19 [BBM2017] MB68 HII 12 21 54.06 +13 27 44.2           ~ 1 0
20 [BBM2017] MB62 HII 12 21 54.08 +13 27 44.2           ~ 1 0
21 [BBM2017] MB25 HII 12 21 54.09 +13 27 39.7           ~ 2 0
22 [BBM2017] MB65 HII 12 21 54.13 +13 27 32.2           ~ 1 0
23 [BBM2017] MB30 HII 12 21 54.14 +13 27 42.8           ~ 2 0
24 [BBM2017] MB66 HII 12 21 54.20 +13 27 34.6           ~ 1 0
25 [BBM2017] MB27 HII 12 21 54.20 +13 27 41.2           ~ 2 0
26 [BBM2017] MB56 HII 12 21 54.22 +13 27 41.8           ~ 2 0
27 [BBM2017] MB38 HII 12 21 54.24 +13 27 47.7           ~ 1 0
28 [BBM2017] MB29 HII 12 21 54.24 +13 27 42.6           ~ 1 0
29 [BBM2017] MB32 HII 12 21 54.25 +13 27 44.7           ~ 1 0
30 [BBM2017] MB26 HII 12 21 54.35 +13 27 41.1           ~ 2 0
31 [BBM2017] MB28 HII 12 21 54.44 +13 27 42.3           ~ 1 0
32 [BBM2017] MB57 HII 12 21 54.50 +13 27 36.8           ~ 1 0
33 [BBM2017] SB38 HII 12 21 55.19 +13 28 57.8           ~ 1 0
34 AGC 226067 G 12 21 55.2 +13 28 10           ~ 24 0
35 [BBM2017] SB42 HII 12 21 55.31 +13 28 47.1           ~ 1 0
36 [BBM2017] SB41 HII 12 21 55.34 +13 28 55.3           ~ 1 0
37 [BBM2017] SB36 HII 12 21 55.45 +13 29 02.1           ~ 1 0
38 [BBM2017] SB39 HII 12 21 55.59 +13 28 57.3           ~ 1 0
39 [BBM2017] SB34 HII 12 21 55.85 +13 29 03.7           ~ 1 0
40 [BBM2017] SB03 HII 12 21 55.88 +13 29 03.1           ~ 1 0
41 AGC 229491 G 12 21 55.9 +13 29 04           ~ 2 0
42 [BBM2017] SB35 HII 12 21 55.95 +13 29 04.0           ~ 1 0
43 [BBM2017] SB33 HII 12 21 56.22 +13 29 08.8           ~ 1 0
44 [BBM2017] SB01 HII 12 21 56.28 +13 29 09.2           ~ 1 0
45 [BBM2017] SB45 HII 12 21 56.29 +13 29 10.3           ~ 1 0
46 [BBM2017] SB02 HII 12 21 56.32 +13 29 11.2           ~ 2 0
47 [BBM2017] MB39 HII 12 21 56.35 +13 27 47.7           ~ 1 0
48 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
49 NAME Local Group GrG ~ ~           ~ 9325 0

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