2024MNRAS.535.1526L

Query : 2024MNRAS.535.1526L

2024MNRAS.535.1526L - Mon. Not. R. Astron. Soc., 535, 1526-1532 (2024/December-1)

Detection of extended gamma-ray emission in the vicinity of Cl Danks 1 and 2.

LIU J.-H., LIU B. and YANG R.-Z.

Abstract (from CDS):

We report the detection of high-energy gamma-ray emission towards the G305 star-forming region. Using almost 15 yr of observation data from Fermi Large Area Telescope, we detected an extended gamma-ray source in this region with a significance of $\sim 13 \sigma$. The gamma-ray radiation reveals a clear pion-bump feature and can be fitted with the power-law parent proton spectrum with an index of $-2.5$. The total cosmic ray (CR) proton energy in the gamma-ray production region is estimated to be of the order of $10^{49}\ \rm erg$. We further derived the CR radial distribution from both the gamma-ray emission and gas distribution and found it roughly obeys the $1/r$ type profile, though a constant profile is not ruled out. This is consistent with other similar systems and expected from the continuous injection of CRs by the central powerful young massive star cluster Danks 1 or Danks 2 in this region. Together with former detections of similar gamma-ray structures, such as Cygnus cocoon, Westerlund 1, Westerlund 2, NGC 3603, and W40, the detection supports the hypothesis that young massive star clusters are CR accelerators.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): cosmic rays - ISM: individual objects: G305.4+0.1 - open clusters and associations: individual: Danks 1 and Danks 2 - gamma-rays: ISM

Simbad objects: 20

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Number of rows : 20
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 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
2 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
3 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 400 0
4 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
5 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
6 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
7 PSR J1301-6305 Psr 13 02 47.9992676 -63 10 48.001099           ~ 139 2
8 3FGL J1305.7-6241 gam 13 05 35.1 -62 41 38           ~ 13 0
9 SNR G304.6+00.1 SNR 13 05 59 -62 42.0           ~ 93 0
10 Cl Danks 1 OpC 13 12 29.0 -62 41 56           ~ 80 0
11 Cl Danks 2 OpC 13 12 53.3 -62 40 52           ~ 73 0
12 NAME G305 Complex SFR 13 13 -62.7           ~ 72 0
13 4FGL J1315.9-6349c gam 13 15 58.2 -63 49 46           ~ 4 0
14 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
15 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
16 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
17 GAL 025.0+00.0 SFR 18 37 -07.1           ~ 7 0
18 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
19 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
20 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0

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