J/A+A/671/A47 Fermi Cygnus cocoon (Astiasarain+, 2023)
Multiple emission components in the Cygnus cocoon detected from Fermi-LAT
observations.
Astiasarain X., Tibaldo L., Martin P., Knoedlseder J., Remy Q.
<Astron. Astrophys. 671, A47 (2023)>
=2023A&A...671A..47A 2023A&A...671A..47A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Gamma rays
Keywords: acceleration of particles - cosmic rays - gamma rays: ISM -
open clusters and association: individual: Cygnus OB2 -
open clusters and associations: individual: NGC 6910
Abstract:
Star-forming regions may play an important role in the life cycle of
Galactic cosmic rays, notably as home to specific acceleration
mechanisms and transport conditions. Gamma-ray observations of
Cygnus∼X have revealed the presence of an excess of hard-spectrum
gamma-ray emission, possibly related to a cocoon of
freshly-accelerated particles. We seek an improved description of the
gamma-ray emission from the cocoon using ∼13 years of observations
with the Fermi-LAT and use it to further constrain the processes and
objects responsible for the young cosmic-ray population. We develop an
emission model for a large region of interest, including a description
of interstellar emission from the background population of cosmic rays
and recent models for other gamma-ray sources in the field. Thus, we
perform an improved spectro-morphological characterisation of the
residual emission including the cocoon.
Description:
We presented an analysis of the gamma-ray emission from the Cygnus
region based on ∼13yr of Fermi-LAT data. The extraction of the
emission from the so-called Cygnus cocoon was performed from a
dedicated modelling of interstellar emission from the region.
Objects:
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GLON GLAT Designation(s)
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78.74 +1.56 FCES G78.74+1.56
78.83 +3.57 FCES G78.83+3.57
80.00 +0.50 FCES G80.00+0.50
85.00 -1.78 FCES G85.00-1.78
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
pg78p74.dat 578 23 Profiles of FCES G78.74+1.56
pg80p00.dat 561 1 Profiles of FCES G80.00+0.50
g78p74.dat 158 13 SED of FCES G78.74+1.56
g78p83.dat 158 13 SED of FCES G78.83+3.57
g80p00.dat 158 13 SED of FCES G80.00+0.50
g85p00.dat 158 13 SED of FCES G85.00-1.78
list.dat 150 3 List of fits maps
fits/* . 3 Individual fits maps
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Byte-by-byte Description of file: pg78p74.dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 deg Offset Offset from G78.74+1.56
6- 9 F4.2 deg e_Offset rms uncertainty on Offset
11- 15 A5 deg Azimuth Azimuth
17- 20 A4 deg e_Azimuth rms uncertainty on Azimuth
22- 43 E22.16 sr/cm2 TotCol Total surface column density
45- 65 F21.19 sr SA Solid angle
67- 88 E22.16 1/s/sr Em1 Emissivity at 500-2236MeV
90-111 E22.16 1/s/sr s_Em1 Statistical error on Em1
113-134 E22.16 1/s/sr e_Em1 Error on Em1 (lower value)
136-157 E22.16 1/s/sr E_Em1 Error on Em1 (upper value)
159-180 E22.16 1/s/sr Em2 Emissivity at 2236MeV-10GeV
182-203 E22.16 1/s/sr s_Em2 Statistical error on Em2236-10G
205-226 E22.16 1/s/sr e_Em2 Error on Em2 (lower value)
228-249 E22.16 1/s/sr E_Em2 Error on Em2 (upper value)
251-272 E22.16 1/s/sr Em3 Emissivity at 10GeV-1TeV
274-295 E22.16 1/s/sr s_Em3 Statistical error on Em3
297-318 E22.16 1/s/sr e_Em3 Error on Em3 (lower value)
320-341 E22.16 1/s/sr E_Em3 Error on Em3 (upper value)
343-351 E9.3 1/cm2/s/sr Int1 Intensity at 500-2236MeV
353-374 E22.16 1/cm2/s/sr s_Int1 Statistical error on Int1
376-397 E22.16 1/cm2/s/sr E_Int1 Error on Int1 (upper value)
399-420 E22.16 1/cm2/s/sr e_Int1 Error on Int1 (lower value)
422-430 E9.3 1/cm2/s/sr Int2 Intensity at 2236MeV-10GeV
432-453 E22.16 1/cm2/s/sr s_Int2 Statistical error on Int2
455-476 E22.16 1/cm2/s/sr E_Int2 Error on Int2 (upper value)
478-499 E22.16 1/cm2/s/sr e_Int2 Error on Int2 (lower value)
501-509 E9.3 1/cm2/s/sr Int3 Intensity at 10GeV-1TeV
511-532 E22.16 1/cm2/s/sr s_Int3 Statistical error on Int3
534-555 E22.16 1/cm2/s/sr E_Int3 Error on Int3 (upper value)
557-578 E22.16 1/cm2/s/sr e_Int3 Error on Int3 (lower value)
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Byte-by-byte Description of file: pg80p00.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Name (FCES G80.00+0.50)
18- 39 E22.16 sr/cm2 TotCol Total surface column density
41- 60 F20.18 sr SA Solid angle
62- 81 E20.14 1/s/sr Em1 Emissivity at 500-2236MeV
83-103 E21.15 1/s/sr s_Em1 Statistical error on Em1
105-125 E21.15 1/s/sr E_Em1 Error on Em1 (upper value)
127-148 E22.16 1/s/sr e_Em1 Error on Em1 (lower value)
150-170 E21.15 1/s/sr Em2 Emissivity at 2236MeV-10GeV
172-192 E21.15 1/s/sr s_Em2 Statistical error on Em2
194-214 E21.15 1/s/sr E_Em2 Error on Em2 (upper value)
216-236 E21.15 1/s/sr e_Em2 Error on Em2 (lower value)
238-259 E22.16 1/s/sr Em3 Emissivity at 10GeV-1TeV
261-282 E22.16 1/s/sr s_Em3 Statistical error on Em3
284-305 E22.16 1/s/sr E_Em3 Error on Em3 (upper value)
307-328 E22.16 1/s/sr e_Em3 Error on Em3 (lower value)
330-338 E9.3 1/cm2/s/sr Int1 Intensity at 500-2236MeV
340-360 E21.15 1/cm2/s/sr s_Int1 Statistical error on Int1
362-383 E22.16 1/cm2/s/sr E_Int1 Error on Int1 (upper value)
385-406 E22.16 1/cm2/s/sr e_Int1 Error on Int1 (lower value)
408-416 E9.3 1/cm2/s/sr Int2 Intensity at 2236MeV-10GeV
418-439 E22.16 1/cm2/s/sr s_Int2 Statistical error on Int2
441-462 E22.16 1/cm2/s/sr E_Int2 Error on Int2 (upper value)
464-485 E22.16 1/cm2/s/sr e_Int2 Error on Int2 (lower value)
487-495 E9.3 1/cm2/s/sr Int3 Intensity at 10GeV-1TeV
497-517 E21.15 1/cm2/s/sr s_Int3 Statistical error on Int3
519-539 E21.15 1/cm2/s/sr E_Int3 Error on Int3 (upper value)
541-561 E21.15 1/cm2/s/sr e_Int3 Error on Int3 (lower value)
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Byte-by-byte Description of file: g78p74.dat g78p83.dat g80p00.dat g85p00.dat
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Bytes Format Units Label Explanations
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1- 20 F20.13 MeV E Energy
22- 42 F21.14 MeV e_E Error on energy (lower value)
44- 64 F21.14 MeV E_E Error on energy (upper value)
66- 87 E22.16 1/cm2/MeV/s Flux Flux
89-110 E22.16 1/cm2/MeV/s s_Flux rms uncertainty on flux
112 I1 --- l_Flux [1]? Limit flag on flux, 1 for True
114-135 E22.16 1/cm2/MeV/s e_Flux Error on Flux (lower value)
137-158 E22.16 1/cm2/MeV/s E_Flux Error on Flux (upper value)
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1 A1 --- --- [G]
2- 10 F9.5 deg GLON Galactic longitude of center
11- 19 F9.5 deg GLAT Galactic latitude of center
21- 24 I4 --- Nx Number of pixels along X-axis
26- 29 I4 --- Ny Number of pixels along Y-axis
31- 36 I6 Kibyte size Size of FITS file
38- 93 A56 --- FileName Name of FITS file, in subdirectory fits
95-150 A56 --- Title Title of the FITS file
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Acknowledgements:
Luigi Tibaldo, luigi.tibaldo(at)irap.omp.eu
(End) Patricia Vannier [CDS] 10-Jan-2023