First detection of the methylidyne cation (CH+) fundamental rotational line with the Herschel/SPIRE FTS

D. A. Naylor; E. Dartois; E. Habart; A. Abergel; J.-P. Baluteau; S. C. Jones; E. Polehampton; P. Ade; L. D. Anderson; P. André; H. Arab; J.-P. Bernard; K. Blagrave; S. Bontemps; F. Boulanger; M. Cohen; M. Compiègne; P. Cox; G. Davis; R. Emery; T. Fulton; C. Gry; M. Huang; C. Joblin; J. M. Kirk; G. Lagache; T. Lim; S. Madden; G. Makiwa; P. Martin; M.-A. Miville-Deschênes; S. Molinari; H. Moseley; F. Motte; K. Okumura; D. Pinheiro Gonçalves; J. A. Rodón; D. Russeil; P. Saraceno; S. Sidher; L. Spencer; B. Swinyard; D. Ward-Thompson; G. J. White; A. Zavagno

HAL: hal-00522987, version 1

arXiv: 1005.1916

ADS Bibliographic id: 2010A&A...518L.117N

DOI: 10.1051/0004-6361/201014656

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Astronomy and Astrophysics 518 (2010) L117

First detection of the methylidyne cation (CH+) fundamental rotational line with the Herschel/SPIRE FTS

D. A. Naylor, E. Dartois ¹, E. Habart ¹, A. Abergel ¹, J.-P. Baluteau, S. C. Jones, E. Polehampton, P. Ade, L. D. Anderson ², P. André ³, H. Arab, J.-P. Bernard ^1, 4, K. Blagrave, S. Bontemps ^{5, 6, 7, 8}, F. Boulanger ¹, M. Cohen, M. Compiègne, P. Cox, G. Davis ⁹, R. Emery, T. Fulton, C. Gry ², M. Huang ¹⁰, C. Joblin ⁴, J. M. Kirk, G. Lagache ¹, T. Lim ¹¹, S. Madden ¹², G. Makiwa, P. Martin ¹³, M.-A. Miville-Deschênes ¹, S. Molinari ¹⁴, H. Moseley, F. Motte ^15, 16, K. Okumura, D. Pinheiro Gonçalves, J. A. Rodón, D. Russeil ², P. Saraceno ¹⁴, S. Sidher, L. Spencer, B. Swinyard, D. Ward-Thompson ¹⁷, G. J. White ¹⁸, A. Zavagno ^2, 19

(2010)

Aims: To follow the species chemistry arising in diverse sources of the Galaxy with Herschel. Methods: SPIRE FTS sparse sampled maps of the Orion bar & compact HII regions G29.96-0.02 and G32.80+0.19 have been analyzed. Results: Beyond the wealth of atomic and molecular lines detected in the high-resolution spectra obtained with the FTS of SPIRE in the Orion Bar, one emission line is found to lie at the position of the fundamental rotational transition of CH+ as measured precisely in the laboratory by Pearson and Drouion. This coincidence suggests that it is the first detection of the fundamental rotational transition of CH+. This claim is strengthened by the observation of the lambda doublet transitions arising from its relative, CH, which are also observed in the same spectrum. The broad spectral coverage of the SPIRE FTS allows for the simultaneous measurement of these closely related chemically species, under the same observing conditions. The importance of these lines are discussed and a comparison with results obtained from models of the photon dominated region (PDR) of Orion are presented. The CH+ line also appears in absorption in the spectra of the two galactic compact HII regions G29.96-0.02 and G32.80+0.19, which is likely due to the presence of CH+ in the the cold neutral medium of the galactic plane. These detections will shed light on the formation processes and on the existence of CH+, which are still outstanding questions in astrophysics. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

1:	Institut d'astrophysique spatiale (IAS)

	CNRS : UMR8617 – INSU – Université Paris XI - Paris Sud

2:	Laboratoire d'Astrophysique de Marseille (LAM)

	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I

3:	Laboratoire d'Informatique de Nantes Atlantique (LINA)

	CNRS : UMR6241 – Université de Nantes – École Nationale Supérieure des Mines - Nantes

4:	Centre d'étude spatiale des rayonnements (CESR)

	CNRS : UMR5187 – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III

5:	Laboratoire d'Astrophysique de Bordeaux (LAB)

	CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I

6:	Observatoire aquitain des sciences de l'univers (OASU)

	CNRS : UMS2567 – INSU – Université Sciences et Technologies - Bordeaux I

7:	Université Sciences et Technologies - Bordeaux 1

	Université Sciences et Technologies - Bordeaux I

8:	Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB)

	CNRS : UMR5804 – INSU – Université Sciences et Technologies - Bordeaux I

9:	Department of Ecology & Evolutionary Biology

	Princeton University

10:	National Astronomical Observatories

	Chinese Academy of Sciences

11:	Laboratoire de Probabilités et Modèles Aléatoires (LPMA)

	CNRS : UMR7599 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot

12:	Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA)

	CEA : DSM/DAPNIA

13:	CITA

	University of Toronto

14:	Interplanetary Space Physics Institute (IFSI) (IFSI-INAF)

	Interplanetary Space Physics Institute

15:	Laboratoire AIM (AIM)

	CEA – Université Paris VII - Paris Diderot

16:	Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) (IRFU)

	CEA : DSM/IRFU

17:	School of Physics & Astronomy

	Cardiff University

18:	Engineering Department

	University of Cambridge

19:	Observatoire Astronomique de Marseille Provence (OAMP)

	INSU – Université de Provence - Aix-Marseille I – CNRS : UMR6110

Subject

Sciences of the Universe/Astrophysics/Solar and Stellar Astrophysics

Physics/Astrophysics/Solar and Stellar Astrophysics

Keyword(s): ISM: molecules – evolution – ISM: general – space vehicles: instruments – techniques: spectroscopic

Fulltext link:

http://fr.arXiv.org/abs/1005.1916


hal-00522987, version 1
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From: Marie-Paule Pomies <>
Submitted on: Monday, 4 October 2010 10:31:20
Updated on: Thursday, 7 October 2010 10:51:58