Continuum, CO and Water vapour maps of the Orion Nebula. First millimetre spectral imaging with Concerto
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
3 LAM - Laboratoire d'Astrophysique de Marseille
4 NEEL - HELFA - Hélium : du fondamental aux applications
5 ObAS - Observatoire astronomique de Strasbourg
6 NEEL - Cryo - Cryogénie
7 ESO - European Southern Observatory
8 IRAM - Instituto de RadioAstronomía Milimétrica
9 Instituto de Fisica y Astronomia [Valparaiso]
10 LAGRANGE - Joseph Louis LAGRANGE
11 School of Physics and Astronomy [Cardiff]
12 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
13 IRAM - Institut de RadioAstronomie Millimétrique
14 Dipartimento di Fisica [Roma]
15 IPM - Institute for Research in Fundamental Sciences [Tehran]
16 CAB - Centro de Astrobiologia [Madrid]
17 NOA - National Observatory of Athens
18 ANL - Argonne National Laboratory [Lemont]
19 LERMA - LERMA Cergy
20 ICE-CSIC - Institute of Space Sciences [Barcelona]
21 IRAP - Institut de recherche en astrophysique et planétologie
22 School of Physics and Astronomy [Leeds]
23 IAP - Institut d'Astrophysique de Paris
24 IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
- Fonction : Auteur
- PersonId : 1218932
- IdHAL : abeelen
- ORCID : 0000-0003-3201-0185
- IdRef : 133827755
- Fonction : Auteur
- PersonId : 980621
- ORCID : 0000-0002-3915-2015
- IdRef : 153587113
- Fonction : Auteur
- PersonId : 830119
- Fonction : Auteur
- PersonId : 21058
- IdHAL : guilaine-lagache
- ORCID : 0000-0003-1492-2519
- IdRef : 158000439
- Fonction : Auteur
- PersonId : 1653797
- IdHAL : alessia-ritacco
- ORCID : 0000-0003-0162-8206
Résumé
The millimetre spectrum of Galactic regions and galaxies is rich in continuum and molecular lines. That diversity is mostly tackled by either broad-band photometry or high resolution heterodyne spectroscopy. We aim to map the millimetre continuum emission of Galactic regions with a spectral resolution intermediate between broad-band photometry and heterodyne spectroscopy, enabling us to quickly cover large sky areas with spectroscopy. We report observations of the Orion Nebula with the CONCERTO instrument, which was installed at the APEX telescope focal plane from April 2021 to December 2023. We find that the spectrum of Orion is dominated by dust emission with an emissivity index from 1.3 to 2.0 along with the strong CO(2-1) and H$_2$O lines which are naturally separated from the continuum, thanks to CONCERTO spectral capabilities. Many regions show a strong free-free emission as well, at lower frequencies. We demonstrate the spectral capabilities of CONCERTO at intermediate spectral resolution, with a frequency coverage from 130 to 310 GHz. A sensitivity of 200 mK is achieved in one second, for one beam and a 6 GHz frequency width, over an 18 arcmin diameter field-of-view, which is within a factor 3 of the expectations. We show that we can spectrally disentangle the continuum from the CO line emission. The slope of the millimetre continuum is line-free mapped for the first time in Orion.
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