2010AJ....139.2170C

Query : 2010AJ....139.2170C

2010AJ....139.2170C - Astron. J., 139, 2170-2183 (2010/June-0)

The stellar and gaseous contents of the Orion dwarf galaxy.

CANNON J.M., HAYNES K., MOST H., SALZER J.J., HAUGLAND K., SCUDDER J., SUGDEN A. and WEINDLING J.

Abstract (from CDS):

We present new Kitt Peak National Observatory 0.9 m optical and Very Large Array H I spectral line observations of the Orion dwarf galaxy. This nearby (D ≃ 5.4 Mpc), intermediate-mass (Mdyn≃ 1.1x1010 M☉) dwarf displays a wealth of structure in its neutral interstellar medium, including three prominent "hole/depression" features in the inner H I disk. We explore the rich gas kinematics, where solid-body rotation dominates and the rotation curve is flat out to the observed edge of the H I disk (∼6.8 kpc). The Orion dwarf contains a substantial fraction of dark matter throughout its disk: comparing the 4.7x108 M☉ of detected neutral gas with estimates of the stellar mass from optical and near-infrared imaging (3.7x108 M☉) implies a mass-to-light ratio ≃13. New Hα observations show only modest-strength current star formation (SF; ∼0.04 M☉/yr); this SF rate is consistent with our 1.4 GHz radio continuum non-detection.

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Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: individual: Orion dwarf - galaxies: irregular

Nomenclature: Table 2: [CHM2010] NN (Nos 1-18).

Simbad objects: 23

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Number of rows : 23
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 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 QSO B0529+075 Bla 05 32 38.9985483000 +07 32 43.344156480   19.0 19.00 17.50   ~ 252 1
3 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
4 [CHM2010] 1 HII 05 44 56.470 +05 02 44.44           ~ 1 0
5 [CHM2010] 2 HII 05 44 57.950 +05 03 20.11           ~ 1 0
6 [CHM2010] 3 HII 05 44 59.700 +05 04 03.90           ~ 1 0
7 [CHM2010] 4 HII 05 44 59.990 +05 03 25.04           ~ 1 0
8 [CHM2010] 5 HII 05 45 00.390 +05 03 03.75           ~ 1 0
9 [CHM2010] 6 HII 05 45 00.440 +05 03 15.33           ~ 1 0
10 [CHM2010] 7 HII 05 45 00.870 +05 05 38.32           ~ 1 0
11 [CHM2010] 8 HII 05 45 00.990 +05 03 15.88           ~ 1 0
12 NAME Ori Dwarf Galaxy GiC 05 45 01.6 +05 03 41   18.0       ~ 46 0
13 [CHM2010] 9 HII 05 45 01.7322359184 +05 02 44.625768756           ~ 1 0
14 [CHM2010] 10 HII 05 45 01.940 +05 04 07.87           ~ 1 0
15 [CHM2010] 11 HII 05 45 02.610 +05 04 19.13           ~ 1 0
16 [CHM2010] 12 HII 05 45 02.690 +05 02 40.95           ~ 1 0
17 [CHM2010] 13 HII 05 45 03.110 +05 04 39.36           ~ 1 0
18 [CHM2010] 14 HII 05 45 03.210 +05 05 16.82           ~ 1 0
19 [CHM2010] 15 HII 05 45 03.950 +05 02 41.47           ~ 1 0
20 [CHM2010] 16 HII 05 45 04.260 +05 04 48.27           ~ 1 0
21 [CHM2010] 17 HII 05 45 04.590 +05 05 02.30           ~ 1 0
22 [CHM2010] 18 HII 05 45 05.530 +05 03 25.42           ~ 1 0
23 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1

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