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Titolo: Spiral arms in near-infrared bands - Broad- and narrow-band NIR photometry
Autore: Patsis, PA; Heraudeau, P; Grosbol, P;
- Indirizzi:
- Acad Athens, Res Ctr Astron, Athens 10673, Greece Acad Athens Athens Greece 10673 ns, Res Ctr Astron, Athens 10673, Greece Astron Rech Inst Heidelberg, D-69120 Heidelberg, Germany Astron Rech Inst Heidelberg Heidelberg Germany D-69120 idelberg, Germany Max Planck Inst Astron, D-69117 Heidelberg, Germany Max Planck Inst Astron Heidelberg Germany D-69117 17 Heidelberg, Germany European So Observ, D-85748 Garching, Germany European So Observ Garching Germany D-85748 v, D-85748 Garching, Germany
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 3,
volume: 370,
anno: 2001,
pagine: 875 - 880
- SICI:
- 1432-0746(200105)370:3<875:SAINB->2.0.ZU;2-2
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- GALAXIES; STELLAR; MODELS; DISKS;
- Keywords:
- galaxies : photometry; galaxies : spiral; galaxies : structure; infrared : galaxies;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 21
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Patsis, PA Acad Athens, Res Ctr Astron, 14 Anagnostopoulou St, Athens 10673, Greece Acad Athens 14 Anagnostopoulou St Athens Greece 10673 , Greece
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- Citazione:
- P.A. Patsis et al., "Spiral arms in near-infrared bands - Broad- and narrow-band NIR photometry", ASTRON ASTR, 370(3), 2001, pp. 875-880
Abstract
We investigate the contribution of Br gamma and H-2 emission due to young objects in the arms of spiral galaxies observed in the K' filter. Out of a sample of disk galaxies for which we obtained deep surface photometry in broad- and narrow-band near-infrared filters, we selected two grand design spirals (NGC 5861, NGC 7412), which clearly have sharp knots along their armsboth ill optical and NIR images. For these galaxies we estimate the amountof light coming from Br? and Hz emission and we conclude that it represents only a few percent of the observed K' light. For comparison we used the spiral galaxy NGC 4603, which has high recessional velocity. In this case the emission lines we study are practically shifted out of the narrow-band filter. Comparing its flux with what we found in the two former cases, we conclude that a major contribution from young objects in K' comes from continuum radiation which in the arm regions can amount to 20%.
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Documento generato il 24/05/13 alle ore 01:11:16