2017ApJ...842....4A


Query : 2017ApJ...842....4A

2017ApJ...842....4A - Astrophys. J., 842, 4-4 (2017/June-2)

The origin of [C II] 157 µm emission in a five-component interstellar medium: the case of NGC 3184 and NGC 628.

ABDULLAH A., BRANDL B.R., GROVES B., WOLFIRE M., CALZETTI D., CROXALL K., DE LOOZE I., KENNICUTT R.C., SANDSTROM K.M., ARMUS L., DALE D.A., GALAMETZ M., HERRERA-CAMUS R., HUNT L.K., SMITH J.D. and TIELENS A.G.G.M.

Abstract (from CDS):

With its relatively low ionization potential, C+ can be found throughout the interstellar medium (ISM) and provides one of the main cooling channels of the ISM via the [C II] 157 µm emission. While the strength of the [C II] line correlates with the star formation rate, the contributions of the various gas phases to the [C II] emission on galactic scales are not well established. In this study we establish an empirical multi-component model of the ISM, including dense H II regions, dense photon dissociation regions (PDRs), the warm ionized medium (WIM), low density and G0 surfaces of molecular clouds (SfMCs), and the cold neutral medium (CNM). We test our model on ten luminous regions within the two nearby galaxies NGC 3184 and NGC 628 on angular scales of 500-600 pc. Both galaxies are part of the Herschel key program KINGFISH, and are complemented by a large set of ancillary ground- and space-based data. The five modeled phases together reproduce the observed [C II] emission quite well, overpredicting the total flux slightly (about 45%) averaged over all regions. We find that dense PDRs are the dominating component, contributing 68% of the [C II] flux on average, followed by the WIM and the SfMCs, with mean contributions of about half of the contribution from dense PDRs, each. CNM and dense H II regions are only minor contributors with less than 5% each. These estimates are averaged over the selected regions, but the relative contributions of the various phases to the [C II] flux vary significantly between these regions.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: ISM - galaxies: ISM

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1111 1
2 ESO 350-38 Sy2 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 373 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12559 1
4 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3303 2
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5811 1
6 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1710 1
7 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1331 3
8 NGC 1331 GiG 03 26 28.3322458080 -21 21 19.955101860   14.25   12.86   ~ 76 0
9 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1505 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17262 1
11 M 42 HII 05 35 17 -05 23.4           ~ 4057 0
12 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 864 0
13 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2001 2
14 NGC 3180 GiG 10 18 16.985 +41 25 27.77   10.4       ~ 723 0
15 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1010 2
16 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 955 1
17 NGC 4559 H2G 12 35 57.6402869976 +27 57 35.859278160   10.46 10.01     ~ 622 1
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14214 0
19 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1605 0
20 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 433 1
21 NAME Local Group GrG ~ ~           ~ 8311 0

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