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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559477.0, MPI für Astronomie / Publikationen_mpia
A multi-wavelength analysis of M 81: insight on the nature of Arp's loop
Authors:Sollima, A.; Gil de Paz, A.; Martinez-Delgado, D.; Gabany, R. J.; Gallego-Laborda, J. J.; Hallas, T.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.A83
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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. <BR /> Aims: Our primary purpose was to identify the sources of optical and infrared emission observed in Arp's loop. <BR /> 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. <BR /> 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. <BR /> 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
Free Keywords:methods: data analysis; techniques: photometric; galaxies: individual: M 81; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010A%26A...516A..83... [ID No:1]
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