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O ambiente de novos enxames estelares jovens na Galáxia exterior: um estudo no milímetro e no infravermelho
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This dissertion presents the study, in the millimetre and infrared, of a sample of 14 star forming regions found within dense cores in the outer Galaxy. Millimetre spectroscopic ob servations of the sources were performed, at the Yebes Observatory and at the Onsala Space
Observatory, using the CO (J=1−0), 13CO (J=1−0), CS (J=1−0), and CS (J=2−1) line tran sitions. The data were reduced using the CLASS software to obtain the parameters of the
lines.
Emission of CO (J=1−0), 13CO (J=1−0), CS (J=1−0) and CS (J=2−1) has been detected
toward the sources, confirming the existence of dense gas cores. Contour maps of the sources
were made for the integrated intensity of the CS (J=1−0), CO (J=1−0), and 13CO (J=1−0)
lines, and the physical parameters of the cores were derived. The cores had masses ranging from
10 to 1000 M .
Near-infrared observations of the source IRAS00544+5609 were performed, at the La Palma
observatory, at the J, H and Ks bands. The data were reduced using the IRAF software to
obtain mosaics of the region in the direction of the source. Apperture photometry was used to
obtain a list of magnitudes of the stars in the mosaics. Star density maps show a density peak
overlapping the peaks of the millimetre maps, suggesting the presence of an embedded cluster
within the gas core. A color-color diagram of the cluster members shows a significant number
of stars with infrared excess.
To acquire information pertaining to the dust content of the clouds, sub-millimetre images of
the sources were retrieved from the Herschel space observatory archive. The images show strong
emission in the direction of the sources, indicating the presence of great amounts of dust.
Descrição
Tese de mestrado, Física (Astrofísica e Cosmologia) Universidade de Lisboa, Faculdade de Ciências, 2022
Palavras-chave
Nuvens moleculares Enxames estelares Formação de estrelas Milímetro Infravermelho Teses de mestrado - 2022