2014ApJ...790..117B

Query : 2014ApJ...790..117B

2014ApJ...790..117B - Astrophys. J., 790, 117 (2014/August-1)

Cannibalization and rebirth in the NGC 5387 system. I. The stellar stream and star-forming region.

BEATON R.L., MARTINEZ-DELGADO D., MAJEWSKI S.R., D'ONGHIA E., ZIBETTI S., GABANY R.J., JOHNSON K.E., BLANTON M. and VERBISCER A.

Abstract (from CDS):

We have identified a low surface brightness stellar stream from visual inspection of Sloan Digital Sky Survey (SDSS) imaging for the edge-on, spiral galaxy NGC 5387. An optically blue overdensity coincident with the stream intersection with the NGC 5387 disk was also identified in SDSS and in the Galaxy Evolution Explorer Deep Imaging Survey contributing 38% of the total far-UV integrated flux from NGC 5387. Deeper optical imaging was acquired with the Vatican Advanced Technology Telescope that confirmed the presence of both features. The stellar stream is red in color, (B - V) = 0.7, has a stellar mass of 6x108 M☉, which implies a 1:50 merger ratio, has a circular radius, Rcirc∼ 11.7 kpc, formed in ∼240 Myr, and the progenitor had a total mass of ∼4x1010 M☉. Spectroscopy from LBT+MODS1 was used to determine that the blue overdensity is at the same redshift as NGC 5387, consists of young stellar populations (∼10 Myr), is metal-poor (12 + log (O/H) = 8.03), and is forming stars at an enhanced rate (∼1-3 M☉/yr). The most likely interpretations are that the blue overdensity is (1) a region of enhanced star formation in the outer disk of NGC 5387 induced by the minor accretion event or (2) the progenitor of the stellar stream experiencing enhanced star formation. Additional exploration of these scenarios is presented in a companion paper.

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Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: general - galaxies: individual: NGC 5387 - galaxies: star formation

Simbad objects: 36

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Number of rows : 36
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 Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
6 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
7 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
8 NGC 1055 EmG 02 41 45.233 +00 26 35.45 11.59 11.40 10.59 10.5 10.7 ~ 297 2
9 NGC 1084 EmG 02 45 59.926 -07 34 43.10 11.22 11.59 10.73 10.55 11.1 ~ 386 2
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
12 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
13 NGC 4013 GiG 11 58 31.417 +43 56 49.28   12.4       ~ 447 1
14 NGC 4216 AGN 12 15 54.444 +13 08 57.84 11.51 10.99 10.01     ~ 424 1
15 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
16 NGC 4651 LIN 12 43 42.6376070448 +16 23 36.002649300   11.30 10.92 10.42 9.84 ~ 537 0
17 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1292 2
18 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 439 0
19 NGC 5386 GiG 13 58 22.3214426568 +06 20 20.751083736   13.7       ~ 44 0
20 GALEX J135824.6+060418 UV 13 58 24.6 +06 04 18           ~ 1 0
21 NGC 5387 AG? 13 58 24.807 +06 04 16.60   14.8       ~ 54 0
22 GALEX J135825.0+060438 UV 13 58 25.0 +06 04 38           ~ 1 0
23 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 105 0
24 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
25 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 195 0
26 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 250 1
27 NGC 5587 LIN 14 22 10.7116072992 +13 55 04.956410460   14.0       ~ 98 0
28 M 102 SyG 15 06 29.561 +55 45 47.91 11.12 10.74 9.89     ~ 578 2
29 NGC 5899 Sy2 15 15 03.252 +42 02 59.47   14.19 13.21     ~ 219 0
30 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 807 0
31 NGC 6846 OpC 19 56 26.9 +32 21 09     14.2     ~ 21 1
32 HD 340611 WD* 20 34 21.8847019255 +25 03 49.750446346 10.687 11.471 11.546 11.648 11.728 DA2.4 329 0
33 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
34 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
35 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
36 NAME Local Group GrG ~ ~           ~ 9325 0

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