Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Mapping the interstellar dust with near-infrared observations: An optimized multi-band technique
Autore:
Lombardi, M; Alves, J;
Indirizzi:
Inst Astrophys & Extraterr Forsch, D-53121 Bonn, Germany Inst Astrophys & Extraterr Forsch Bonn Germany D-53121 121 Bonn, Germany European So Observ, D-85748 Munich, Germany European So Observ Munich Germany D-85748 bserv, D-85748 Munich, Germany
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 377, anno: 2001,
pagine: 1023 - 1034
SICI:
1432-0746(200110)377:3<1023:MTIDWN>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
GIANT MOLECULAR CLOUDS; CARBON-MONOXIDE; DARK NEBULAE; STAR COUNTS; EXTINCTION; CO;
Keywords:
ISM : clouds; ISM : dust, extinction; ISM : structure; ISM : individual objects : Orion molecular complex, Mon R2 molecular complex; methods : data analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Lombardi, M Inst Astrophys & Extraterr Forsch, Auf Hugel 71, D-53121 Bonn,Germany Inst Astrophys & Extraterr Forsch Auf Hugel 71 Bonn Germany D-53121
Citazione:
M. Lombardi e J. Alves, "Mapping the interstellar dust with near-infrared observations: An optimized multi-band technique", ASTRON ASTR, 377(3), 2001, pp. 1023-1034

Abstract

We generalize the technique of Lada et al. (1994) to map dust column density through a molecular cloud (Nice) to an optimized multi-band technique (Nicer) that can be applied to any multi-band survey of molecular clouds. We present a first application to a similar to 625 deg(2) subset of the Two Micron All Sky Survey (2MASS) data and show that when compared to Nice, the optimized Nicer technique (i) achieves the same extinction peak values, (ii)improves the noise variance of the map by a factor of 2 and (iii) is able to reach 3 sigma dust extinction measurements as low as A(V) similar or equal to 0.5 magnitudes, better than or equivalent to classical optical star count techniques and below the threshold column density for the formation ofCO, the brightest H-2 tracer in radio-spectroscopy techniques. The application of the Nicer techniques to near-infrared data obtained with a 8 meter-class telescope with a state-of-the-art NIR camera, such as the VLT-ISAAC combination, will be able to achieve dynamic ranges from below 10(21) protons cm(-2) to over 10(23) protons cm(-2) (A(V) in the range [0.3; 60]) and spatial resolutions <10", making use of a single and straightforward column density tracer, extinction by interstellar dust.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/05/20 alle ore 15:05:39