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http://hdl.handle.net/20.500.12386/26143
Titolo: | DDO 68: A Flea with Smaller Fleas that on Him Prey | Autori: | ANNIBALI, FRANCESCA NIPOTI, CARLO Ciotti, Luca TOSI, Monica Aloisi, Alessandra BELLAZZINI, Michele Cignoni, Michele CUSANO, FELICE PARIS, Diego Sacchi, Elena |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 826 | Fascicolo: | 2 | Da pagina:: | L27 | Abstract: | We present new photometry of the dwarf irregular galaxy DDO 68, one of the most metal-poor and least massive dwarfs, located in the Lynx-Cancer Void. The images were acquired with the Large Binocular Telescope in the g and r passbands and show unequivocally that DDO 68 has previously unknown stellar streams related to the accretion of at least two smaller companions: a flea with smaller fleas biting it, to put it in Jonathan Swift’s words (from Jonathan Swift’s On Poetry: a Rhapsody: So, naturalists observe, a flea/has smaller fleas that on him prey/and these have smaller still to bite em/and so proceed ad infinitum). Our data provide direct observational evidence of multiple galaxy merging occurring at very low galactic mass scales. We present the results of an N-body simulation of the interaction of three dwarf galaxies that reproduce well the main morphological features of DDO 68. | URI: | http://hdl.handle.net/20.500.12386/26143 | URL: | https://iopscience.iop.org/article/10.3847/2041-8205/826/2/L27 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8205/826/2/L27 | Bibcode ADS: | 2016ApJ...826L..27A | Fulltext: | open |
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