Bibcode
Sollima, A.; Gil de Paz, A.; Martínez-Delgado, D.; Gabany, R. J.; Gallego-Laborda, J. J.; Hallas, T.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 516, id.A83
Advertised on:
6
2010
Revista
Número de citas
16
Número de citas referidas
16
Descripción
Context. The optical ring-like structure detected by Arp (1965) around M
81 (commonly referenced as “Arp's loop”) represents one of
the most spectacular features observed in nearby galaxies. Arp's loop is
commonly interpreted as a tail resulting from the tidal interaction
between M 81 and M 82. However, since its discovery the nature of this
feature has remained controversial. Aims: Our primary purpose was
to identify the sources of optical and infrared emission observed in
Arp's loop. Methods: The morphology of Arp's loop has been
investigated with deep wide-field optical images. We also measured its
colors using IRAS and Spitzer-MIPS infrared images and compared them
with those of the disk of M 81 and Galactic dust cirrus that fills the
area where M 81 is located. Results: Optical images reveal that
this peculiar object has a filamentary structure characterized by many
dust features overlapping M 81's field. The ratios of far-infrared
fluxes and the estimated dust-to-gas ratios indicate the infrared
emission of Arp's loop is dominated by the contribution of cold dust
that is most likely from Galactic cirrus. Conclusions: The above
results suggest that the light observed at optical wavelengths is a
combination of emission from i) a few recent star-forming regions
located close to M 81, where both bright UV complexes and peaks in the
HI distribution are found, ii) the extended disk of M 81 and iii)
scattered light from the same Galactic cirrus that is responsible for
the bulk of the far-infrared emission.
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