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-00522987, version 1

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

Astronomy and Astrophysics 518 (2010) L117

Résumé : 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

hal-00522987, version 1
http://hal.archives-ouvertes.fr/hal-00522987
oai:hal.archives-ouvertes.fr:hal-00522987
Contributeur : Marie-Paule Pomies <>
Soumis le : Lundi 4 Octobre 2010, 10:31:20
Dernière modification le : Jeudi 7 Octobre 2010, 10:51:58

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arXiv : 1005.1916

Code Bibliographique ADS : 2010A&A...518L.117N

DOI : 10.1051/0004-6361/201014656

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%% hal-00522987, version 1
%% http://hal.archives-ouvertes.fr/hal-00522987
@article{naylor:hal-00522987,
    hal_id = {hal-00522987},
    url = {http://hal.archives-ouvertes.fr/hal-00522987},
    title = {{First detection of the methylidyne cation (CH+) fundamental rotational line with the Herschel/SPIRE FTS}},
    author = {Naylor, D. A. and Dartois, E. and Habart, E. and Abergel, A. and Baluteau, J.-P. and Jones, S. C. and Polehampton, E. and Ade, P. and Anderson, L. D. and Andr{\'e}, P. and Arab, H. and Bernard, J.-P. and Blagrave, K. and Bontemps, S. and Boulanger, F. and Cohen, M. and Compi{\`e}gne, M. and Cox, P. and Davis, G. and Emery, R. and Fulton, T. and Gry, C. and Huang, M. and Joblin, C. and Kirk, J. M. and Lagache, G. and Lim, T. and Madden, S. and Makiwa, G. and Martin, P. and Miville-Desch{\^e}nes, M.-A. and Molinari, S. and Moseley, H. and Motte, F. and Okumura, K. and Pinheiro Gon{\c c}alves, D. and Rod{\'o}n, J. A. and Russeil, D. and Saraceno, P. and Sidher, S. and Spencer, L. and Swinyard, B. and Ward-Thompson, D. and White, G. J. and Zavagno, A.},
    abstract = {{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.}},
    keywords = {ISM: molecules;evolution;ISM: general;space vehicles: instruments;techniques: spectroscopic;},
    language = {Anglais},
    affiliation = {Institut d'astrophysique spatiale - IAS , Laboratoire d'Astrophysique de Marseille - LAM , Laboratoire d'Informatique de Nantes Atlantique - LINA , Centre d'{\'e}tude spatiale des rayonnements - CESR , Laboratoire d'Astrophysique de Bordeaux - LAB , Observatoire aquitain des sciences de l'univers - OASU , Universit{\'e} Sciences et Technologies - Bordeaux 1 , Laboratoire d'astrodynamique, d'astrophysique et d'a{\'e}ronomie de bordeaux - L3AB , Department of Ecology \& Evolutionary Biology , National Astronomical Observatories , Laboratoire de Probabilit{\'e}s et Mod{\`e}les Al{\'e}atoires - LPMA , D{\'e}partement d'Astrophysique, de physique des Particules, de physique Nucl{\'e}aire et de l'Instrumentation Associ{\'e}e - DAPNIA , CITA , Interplanetary Space Physics Institute (IFSI) - IFSI-INAF , Laboratoire AIM - AIM , Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) - IRFU , School of Physics \& Astronomy , Engineering Department , Observatoire Astronomique de Marseille Provence - OAMP},
    pages = {L117},
    journal = {Astronomy and Astrophysics},
    volume = {518},
    audience = {internationale },
    doi = {10.1051/0004-6361/201014656 },
    year = {2010},
}

%F hal-00522987, version 1
%0 Journal Article
%U http://hal.archives-ouvertes.fr/hal-00522987
%2 SDU:ASTR:SR;PHYS:ASTR:SR
%T First detection of the methylidyne cation (CH+) fundamental rotational line with the Herschel/SPIRE FTS
%A Naylor, D. A.
%A Dartois, E.
%A Habart, E.
%A Abergel, A.
%A Baluteau, J.-P.
%A Jones, S. C.
%A Polehampton, E.
%A Ade, P.
%A Anderson, L. D.
%A André, P.
%A Arab, H.
%A Bernard, J.-P.
%A Blagrave, K.
%A Bontemps, S.
%A Boulanger, F.
%A Cohen, M.
%A Compiègne, M.
%A Cox, P.
%A Davis, G.
%A Emery, R.
%A Fulton, T.
%A Gry, C.
%A Huang, M.
%A Joblin, C.
%A Kirk, J. M.
%A Lagache, G.
%A Lim, T.
%A Madden, S.
%A Makiwa, G.
%A Martin, P.
%A Miville-Deschênes, M.-A.
%A Molinari, S.
%A Moseley, H.
%A Motte, F.
%A Okumura, K.
%A Pinheiro Gonçalves, D.
%A Rodón, J. A.
%A Russeil, D.
%A Saraceno, P.
%A Sidher, S.
%A Spencer, L.
%A Swinyard, B.
%A Ward-Thompson, D.
%A White, G. J.
%A Zavagno, A.
%+ Institut d'astrophysique spatiale - IAS , Laboratoire d'Astrophysique de Marseille - LAM , Laboratoire d'Informatique de Nantes Atlantique - LINA , Centre d'étude spatiale des rayonnements - CESR , Laboratoire d'Astrophysique de Bordeaux - LAB , Observatoire aquitain des sciences de l'univers - OASU , Université Sciences et Technologies - Bordeaux 1 , Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux - L3AB , Department of Ecology & Evolutionary Biology , National Astronomical Observatories , Laboratoire de Probabilités et Modèles Aléatoires - LPMA , Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée - DAPNIA , CITA , Interplanetary Space Physics Institute (IFSI) - IFSI-INAF , Laboratoire AIM - AIM , Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA) - IRFU , School of Physics & Astronomy , Engineering Department , Observatoire Astronomique de Marseille Provence - OAMP
%X 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.
%G Anglais
%2 2010
%R 10.1051/0004-6361/201014656
%J Astronomy and Astrophysics
%2 internationale
%8 2010-00-00
%V 518
%P L117
%K ISM: molecules;evolution;ISM: general;space vehicles: instruments;techniques: spectroscopic;

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<country>FR</country>
<orgName type="institution">CEA</orgName>
<orgName type="institution">Université Paris VII - Paris Diderot</orgName>
</affiliation>
<affiliation>
<orgName type="laboratory">IRFU</orgName>
<orgName type="team">Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)</orgName>
<country>FR</country>
<orgName type="institution">CEA : DSM/IRFU</orgName>
</affiliation>
</author>
<author><persName><forename>K.</forename><surname>Okumura</surname></persName></author>
<author><persName><forename>D.</forename><surname>Pinheiro Gonçalves</surname></persName></author>
<author><persName><forename>J. A.</forename><surname>Rodón</surname></persName></author>
<author><persName><forename>D.</forename><surname>Russeil</surname></persName>
<affiliation>
<orgName type="laboratory">LAM</orgName>
<orgName type="team">Laboratoire d'Astrophysique de Marseille</orgName>
<country>FR</country>
<orgName type="institution">CNRS : UMR6110</orgName>
<orgName type="institution">INSU</orgName>
<orgName type="institution">Université de Provence - Aix-Marseille I</orgName>
</affiliation>
</author>
<author><persName><forename>P.</forename><surname>Saraceno</surname></persName>
<affiliation>
<orgName type="laboratory">IFSI-INAF</orgName>
<orgName type="team">Interplanetary Space Physics Institute (IFSI)</orgName>
<country>IT</country>
<orgName type="institution">Interplanetary Space Physics Institute</orgName>
</affiliation>
</author>
<author><persName><forename>S.</forename><surname>Sidher</surname></persName></author>
<author><persName><forename>L.</forename><surname>Spencer</surname></persName></author>
<author><persName><forename>B.</forename><surname>Swinyard</surname></persName></author>
<author><persName><forename>D.</forename><surname>Ward-Thompson</surname></persName>
<affiliation>
<orgName type="team">School of Physics & Astronomy</orgName>
<country>GB</country>
<orgName type="institution">Cardiff University</orgName>
</affiliation>
</author>
<author><persName><forename>G. J.</forename><surname>White</surname></persName>
<affiliation>
<orgName type="team">Engineering Department</orgName>
<country>GB</country>
<orgName type="institution">University of Cambridge</orgName>
</affiliation>
</author>
<author><persName><forename>A.</forename><surname>Zavagno</surname></persName>
<affiliation>
<orgName type="laboratory">LAM</orgName>
<orgName type="team">Laboratoire d'Astrophysique de Marseille</orgName>
<country>FR</country>
<orgName type="institution">CNRS : UMR6110</orgName>
<orgName type="institution">INSU</orgName>
<orgName type="institution">Université de Provence - Aix-Marseille I</orgName>
</affiliation>
<affiliation>
<orgName type="laboratory">OAMP</orgName>
<orgName type="team">Observatoire Astronomique de Marseille Provence</orgName>
<country>FR</country>
<orgName type="institution">INSU</orgName>
<orgName type="institution">Université de Provence - Aix-Marseille I</orgName>
<orgName type="institution">CNRS : UMR6110</orgName>
</affiliation>
</author>
<title type="main" level="a">First detection of the methylidyne cation (CH+) fundamental rotational line with the Herschel/SPIRE FTS</title></analytic><monogr><title level="j" type="main">Astronomy and Astrophysics</title><imprint><biblScope type="publicationDate">2010-00-00</biblScope><biblScope type="vol">518</biblScope><biblScope type="pp">L117</biblScope></imprint></monogr><idno type="doi">10.1051/0004-6361/201014656</idno><idno type="HALid">http://hal.archives-ouvertes.fr/hal-00522987</idno></biblStruct>
</listBibl>
</listBibl>