[CII] emission and star formation in the spiral arms of M 31
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| hal.structure.identifier | Observatoire de Paris | |
| dc.contributor.author | RODRIGUEZ-FERNANDEZ, N. J. | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | BRAINE, J. | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | BROUILLET, N. | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| hal.structure.identifier | Galaxies et cosmologie | |
| dc.contributor.author | COMBES, Françoise | |
| dc.date.issued | 2006 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Context: .The [Cii] 158 mum line is the most important coolant of the interstellar medium in galaxies but substantial variations are seen from object to object. The main source of the emission at a galactic scale is still poorly understood and candidates range from photodissociation regions (PDRs) to the cold neutral or diffuse warm ionized medium. Previous studies of the [Cii] emission in galaxies have a resolution of several kpc or more so the observed emission is an average of different ISM components.<BR /> Aims: .The aim of this work is to study, for the first time, the [Cii] emission at the scale of a spiral arm. We want to investigate the origin of this line and its use as a tracer of star formation.<BR /> Methods: . We present [Cii] and [Oi] observations of a segment of a spiral arm of M 31 using the Infrared Space Observatory. The [Cii] emission is compared with tracers of neutral gas (CO, Hi) and star formation (Halpha, Spitzer 24 mum).<BR /> Results: . The similarity of the [Cii] emission with the Halpha and 24 mum images is striking when smoothed to the same resolution, whereas the correlation with the neutral gas is much weaker. The [Cii] cooling rate per H atom increases dramatically from ˜ 2.7 × 10<SUP>-26</SUP> erg s<SUP>-1</SUP> atom<SUP>-1</SUP> in the border of the map to ˜ 1.4 × 10<SUP>-25</SUP> erg s<SUP>-1</SUP> atom<SUP>-1</SUP> in the regions of star formation. The [Cii]/FIR{42-122} ratio is almost constant at 2%, a factor 3 higher than typically quoted. However, we do not believe that M 31 is unusual. Rather, the whole-galaxy fluxes used for the comparisons include the central regions where the [Cii]/FIR ratio is known to be lower and the resolved observations neither isolate a spiral arm nor include data as far out in the galactic disk as the observations presented here. A fit to published PDR models yields a plausible average solution of G<SUB>0</SUB> ˜ 100 and n ˜ 3000 for the PDR emission in the regions of star formation in the arm of M 31.<BR /> | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.title.en | [CII] emission and star formation in the spiral arms of M 31 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361:20054662 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | 77-82 | |
| bordeaux.volume | 453 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03732376 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03732376v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2006&rft.volume=453&rft.spage=77-82&rft.epage=77-82&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=RODRIGUEZ-FERNANDEZ,%20N.%20J.&BRAINE,%20J.&BROUILLET,%20N.&COMBES,%20Fran%C3%A7oise&rft.genre=article |
Fichier(s) constituant ce document
| Fichiers | Taille | Format | Vue |
|---|---|---|---|
|
Il n'y a pas de fichiers associés à ce document. |
|||