2007MNRAS.374..979C

Query : 2007MNRAS.374..979C

2007MNRAS.374..979C - Mon. Not. R. Astron. Soc., 374, 979-998 (2007/January-3)

Absolute diffuse calibration of IRAC through mid-infrared and radio study of HII regions.

COHEN M., GREEN A.J., MEADE M.R., BABLER B., INDEBETOUW R., WHITNEY B.A., WATSON C., WOLFIRE M., WOLFF M.J., MATHIS J.S. and CHURCHWELL E.B.

Abstract (from CDS):

We investigate the diffuse absolute calibration of the Infrared Array Camera (IRAC) on the Spitzer Space Telescope (SST) at 8.0µm using a sample of 43 Hii regions with a wide range of morphologies near l = 312°. For each region we carefully measure sky-subtracted, point-source-subtracted, areally integrated IRAC 8.0-µm fluxes and compare these with Midcourse Space eXperiment (MSX) 8.3-µm images at two different spatial resolutions, and with radio continuum maps. We determine an accurate median ratio of IRAC8.0-µm/MSX8.3-µm fluxes, of 1.55 ±0.15. From robust spectral energy distributions of these regions we conclude that the present 8.0-µm diffuse calibration of the SST is 36 per cent too high compared with the MSX validated calibration, perhaps due to scattered light inside the camera. This is an independent confirmation of the result derived for the diffuse calibration of IRAC by the Spitzer Science Centre (SSC).

From regression analyses we find that 843-MHz radio fluxes of Hii regions and mid-infrared (MIR) fluxes are linearly related for MSX at 8.3µm and Spitzer at 8.0µm, confirming the earlier MSX result by Cohen & Green. The median ratio of MIR/843-MHz diffuse continuum fluxes is 600x smaller in non-thermal than thermal regions, making it a sharp discriminant. The ratios are largely independent of morphology up to a size of ∼24arcmin. We provide homogeneous radio and MIR morphologies for all sources. MIR morphology is not uniquely related to radio structure. Compact regions may have MIR filaments and/or diffuse haloes, perhaps infrared counterparts to weakly ionized radio haloes found around compact Hii regions. We offer two IRAC colour-colour plots as quantitative diagnostics of diffuse Hii regions.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): radiation mechanisms: non-thermal - radiation mechanisms: thermal - ISM: structure - supernova remnants - infrared: ISM - radio continuum: ISM

Nomenclature: Table 1: [CG2001] GLLL.ll+B.bb (No. G311.70+0.31) added.

CDS comments: In Chap. 10 : G313.45-0.13 is a misprint for G311.45-0.13

Simbad objects: 61

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Number of rows : 61
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 SNR G310.7-00.3 SNR 13 58 17.8 -62 09 09           ~ 4 0
2 [CG2001] G310.63-0.43 HII 13 58 25.2 -62 17 47           ~ 3 0
3 [CG2001] G310.69-0.31 HII 13 58 39.2 -62 09 54           ~ 3 0
4 [CG2001] G310.68-0.44 HII 13 58 51.5 -62 17 36           ~ 3 0
5 [CG2001] G310.86+0.01 rG 13 59 20.8 -61 48 43           ~ 2 0
6 [CG2001] G310.99+0.42 HII 13 59 30.4 -61 22 56           ~ 3 0
7 [CG2001] G310.89+0.01 HII 13 59 35.6 -61 48 15           ~ 3 0
8 [CG2001] G310.80-0.38 Rad 13 59 43.2 -62 12 15           ~ 2 0
9 NAME Kes 20A SNR 13 59 44.9 -62 13 56           ~ 30 2
10 GAL 311.20+00.75 HII 14 00 26.5 -61 00 27           ~ 7 0
11 [CG2001] G310.90-0.38 HII 14 00 32.8 -62 10 40           ~ 2 0
12 [CG2001] G311.30+0.90 Rad 14 00 56.2 -60 50 16           ~ 2 0
13 GRS G311.31 +00.60 HII 14 01 39.3 -61 07 22           ~ 2 0
14 [CG2001] G311.37+0.79 Rad 14 01 43.9 -60 55 30           ~ 2 0
15 [CG2001] G311.12-0.28 HII 14 02 07.9 -62 01 22           ~ 2 0
16 [CG2001] G311.42+0.60 HII 14 02 33.2 -61 05 40           ~ 3 0
17 GAL 311.29-00.02 HII 14 02 54.3 -61 43 40           ~ 6 0
18 [CG2001] G311.64+0.97 Rad 14 03 27.7 -60 40 42           ~ 2 0
19 [CH87] 311.489+0.368 HII 14 03 35.9 -61 18 22           ~ 19 0
20 GAL 311.45-00.13 X 14 04 31.1 -61 47 23           ~ 13 0
21 [CG2001] G311.63+0.29 HII 14 04 56.5 -61 20 03           ~ 2 0
22 [CG2001] G311.54-0.02 rG 14 04 56.8 -61 39 25           ~ 2 0
23 [CG2001] G311.53-0.13 Rad 14 05 07.6 -61 45 56           ~ 2 0
24 [CG2001] G311.70+0.31 HII 14 05 28.2 -61 17 42           ~ 2 0
25 IRAS 14018-6103 MIR 14 05 34.43856 -61 17 43.2312           ~ 2 0
26 SNR G311.5-00.3 SNR 14 05.6 -61 58           ~ 60 1
27 GAL 311.50-00.48 HII 14 05 42.2 -62 06 49           ~ 8 0
28 [CG2001] G311.59-0.59 HII 14 06 43.7 -62 11 22           ~ 3 0
29 GAL 311.62-00.60 HII 14 06 59.3 -62 11 23           ~ 7 0
30 [CG2001] G311.93+0.21 HII 14 07 31.8 -61 19 31           ~ 2 0
31 GRS G311.89 +00.10 HII 14 07 35.2 -61 27 18           ~ 30 1
32 [CG2001] G311.87-0.24 HII 14 08 08.9 -61 46 24           ~ 3 0
33 GRS G311.97 -00.05 HII 14 08 29.0 -61 33 44           ~ 5 0
34 PHR J1408-6106 PN 14 08 51.7 -61 06 27           ~ 43 2
35 GAL 312.11-00.20 rG 14 09 59.3 -61 39 51           ~ 6 0
36 PSR J1410-6132 Psr 14 10 24.000 -61 32 00.00           ~ 133 1
37 GRS G312.36 -00.04 HII 14 11 34.7 -61 26 10           ~ 6 0
38 GAL 312.50+00.32 HII 14 11 44.5 -61 03 12           ~ 4 0
39 [CG2001] G312.45+0.08 Rad 14 11 59.2 -61 17 40           ~ 2 0
40 GAL 312.58+00.40 HII 14 12 11.6 -60 57 03           ~ 4 0
41 [CG2001] G312.59+0.22 HII 14 12 44.1 -61 07 05           ~ 3 0
42 SNR G312.4-00.4 SNR 14 13 00 -61 44.0           ~ 96 1
43 IRAS 14095-6102 cor 14 13 14.16576 -61 16 46.9740           ~ 26 0
44 [CG2001] G312.68+0.04 Rad 14 13 54.6 -61 15 40           ~ 4 0
45 [CG2001] G312.71+0.02 HII 14 14 12.0 -61 16 14           ~ 3 0
46 [CG2001] G312.67-0.12 Rad 14 14 15.1 -61 24 58           ~ 2 0
47 [CG2001] G312.77+0.06 Rad 14 14 34.1 -61 12 50           ~ 3 0
48 [CG2001] G312.72-0.14 Rad 14 14 42.0 -61 25 10           ~ 2 0
49 GRS G312.93 -00.09 HII 14 16 12.8 -61 18 27           ~ 3 0
50 GAL 313.07+00.32 HII 14 16 13.2 -60 52 20           ~ 3 0
51 [CG2001] G312.95-0.44 HII 14 17 20.2 -61 38 47           ~ 4 0
52 [CG2001] G313.25+0.32 rG 14 17 37.9 -60 48 48           ~ 2 0
53 PN G313.3+00.3 PN 14 18 27.489 -60 47 10.49           ~ 15 0
54 GRS G313.32 +00.05 HII 14 18 55.8 -61 02 36           ~ 3 0
55 [CG2001] G313.37+0.02 HII 14 19 22.8 -61 03 25           ~ 2 0
56 [CG2001] G313.42+0.09 rG 14 19 34.5 -60 58 27           ~ 2 0
57 [CG2001] G313.46+0.19 HII 14 19 36.7 -60 52 00           ~ 2 0
58 [CG2001] G313.28-0.33 Rad 14 19 38.7 -61 25 01           ~ 2 0
59 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 430 0
60 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
61 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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