2013A&A...559A..81X


Query : 2013A&A...559A..81X

2013A&A...559A..81X - Astronomy and Astrophysics, volume 559A, 81-81 (2013/11-1)

Thermal and non-thermal emission in the Cygnus X region.

XU W.F., GAO X.Y., HAN J.L. and LIU F.S.

Abstract (from CDS):

Radio continuum observations detect non-thermal synchrotron and thermal bremsstrahlung radiation. Separation of the two different emission components is crucial for studying the properties of the Galactic interstellar medium. The Cygnus X region is one of the most complex areas in the radio sky, which contains a number of massive stars and HII regions on the diffuse thermal and non-thermal background. More supernova remnants (SNRs) are expected to be discovered. We aim to develop a method that can properly separate the non-thermal and thermal radio continuum emission and apply it to the Cygnus X region. The result can be used to study the properties of different emission components and search for new SNRs in the complex. Multi-frequency radio continuum data from large-scale surveys were used to develop a new component-separation method. Spectral analysis was done pixel-by-pixel for the non-thermal synchrotron emission with a realistic spectral index distribution and a fixed spectral index of β=-2.1 for the thermal bremsstrahlung emission. With the new method, we separate the non-thermal and thermal components of the Cygnus X region at an angular resolution of 9.5'. The thermal emission component is found to comprise 75% of the total continuum radiation at λ6cm. Thermal diffuse emission, rather than the discrete HII regions, is found to be the major contributor to the entire thermal budget. A smooth non-thermal emission background of 100mK*Tb is found. We successfully make the large-extent known SNRs and the HII regions embedded in the complex standing out, but no new large SNRs brighter than ∑1GHz=3.7x10–21W/m2/Hz/sr are found.

Abstract Copyright:

Journal keyword(s): radio continuum: ISM - ISM: supernova remnants - HII regions

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Per Arm PoG 03 30 +45.0           ~ 1432 0
2 LBN 157.62-03.90 HII 04 21.5 +44 22           ~ 6 0
3 SH 2-216 PN 04 43 21.2638228056 +46 42 05.835192876   12.50 12.87 13.04   DAO.6 158 2
4 [KC97c] G160.3+00.9 HII 04 51 40.5 +45 35 05           ~ 2 0
5 LBN 159.17+03.33 HII 04 58 45.70 +47 59 36.0           ~ 80 2
6 SNR G160.8+02.6 SNR 05 01 00.000 +46 40 00.00           ~ 206 0
7 SNR G068.8+02.6 SNR 19 52 55 +32 54.2           ~ 347 1
8 SNR G067.7+01.8 SNR 19 54.5 +31 29           ~ 38 0
9 SNR G069.7+01.0 SNR 20 02.7 +32 43           ~ 37 0
10 SNR G068.6-01.2 SNR 20 08.7 +30 37           ~ 20 0
11 SNR G073.9+00.9 SNR 20 14 15 +36 12.0           ~ 70 0
12 SNR G074.9+01.2 SNR 20 16 01.8 +37 12 53           ~ 178 2
13 IC 1318 HII 20 16 48 +41 57.4           ~ 43 0
14 [KC97c] G078.3+02.8 HII 20 18 35.9 +40 56 27           ~ 4 0
15 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 215 2
16 SNR G078.2+00.1 SNR 20 21 56 +40 15.6           ~ 37 0
17 SNR G076.9+01.0 SNR 20 22 20.000 +38 43 00.00           ~ 64 0
18 IC 1318b ISM 20 27 +40.5           ~ 17 0
19 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 757 1
20 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 890 0
21 SNR G083.0-00.2 SNR 20 46.9 +42 52           ~ 19 0
22 SNR G085.4+00.7 SNR 20 50.7 +45 22           ~ 30 0
23 IC 5070 HII 20 51.0 +44 22           ~ 201 1
24 SNR G084.2-00.8 SNR 20 53.3 +43 27           ~ 77 0
25 NAME NAN complex HII 20 55 +43.9           ~ 47 0
26 SNR G085.9-00.6 SNR 20 58.7 +44 53           ~ 29 0
27 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 389 0
28 NAME Local Arm reg ~ ~           ~ 486 0

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2023.01.30-23:07:18

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