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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28773
Title: HST Resolves Stars in a Tiny Body Falling on the Dwarf Galaxy DDO 68
Authors: ANNIBALI, FRANCESCA 
BELLAZZINI, Michele 
Correnti, M.
Sacchi, E.
TOSI, Monica 
Cignoni, M.
Aloisi, A.
Calzetti, D.
Ciotti, L.
CUSANO, FELICE 
Lee, J.
Nipoti, C.
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 883
Issue: 1
First Page: 19
Abstract: We present new Hubble Space Telescope imaging of a stream-like system associated with the dwarf galaxy DDO 68, located in the Lynx-Cancer void at a distance of D ∼ 12.65 Mpc from us. The stream, previously identified in deep Large Binocular Telescope images as a diffuse low surface brightness structure, is resolved into individual stars in the F606W (broad V) and F814W (∼I) images acquired with the Wide Field Camera 3. The resulting V, I color-magnitude diagram (CMD) of the resolved stars is dominated by old (age ≳ 1-2 Gyr) red giant branch (RGB) stars. From the observed RGB tip, we conclude that the stream is at the same distance as DDO 68, confirming the physical association with it. A synthetic CMD analysis indicates that the large majority of the star formation activity in the stream occurred at epochs earlier than ∼1 Gyr ago, and that the star formation at epochs more recent than ∼500 Myr ago is compatible with zero. The total stellar mass of the stream is ∼10<SUP>6</SUP> M <SUB>☉</SUB>, about 1/100 of that of DDO 68. This is a striking example of hierarchical merging in action at the dwarf galaxy scales.
URI: http://hdl.handle.net/20.500.12386/28773
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab3409
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab3409
Bibcode ADS: 2019ApJ...883...19A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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