UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud
We want to get insight into the formation mechanism and the evolution of UGC 7639, a dwarf galaxy in the Canes Venatici I Cloud (CVnIC). We used archival multiwavelength data to constrain its global properties. Ultraviolet images show that UGC 7639 inner regions are composed mostly by young stellar...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2015/274968 |
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| author | L. M. Buson D. Bettoni P. Mazzei G. Galletta |
| author_facet | L. M. Buson D. Bettoni P. Mazzei G. Galletta |
| author_sort | L. M. Buson |
| collection | DOAJ |
| description | We want to get insight into the formation mechanism and the evolution of UGC 7639, a dwarf galaxy in the Canes Venatici I Cloud (CVnIC). We used archival multiwavelength data to constrain its global properties. Ultraviolet images show that UGC 7639 inner regions are composed mostly by young stellar populations. In addition, we used smoothed particle hydrodynamics simulations with chemophotometric implementation to account for its formation and evolution. UGC 7639 is an example of blue dwarf galaxy whose global properties are well matched by our multiwavelength approach, that is, a suitable approach to highlight the evolution also of these galaxies as a class. We found that the global properties of UGC 7639, namely, its total absolute B-band magnitude, its whole spectral energy distribution, and morphology, are well matched by an encounter with a system four times more massive than our target. Moreover, the current star formation rate of the simulated dwarf, ≈0.03 M⊙ yr−1, is in good agreement with our UV-based estimate. We derived a galaxy age of 8.6 Gyr. Following our simulation, the ongoing star formation will extinguish within 1.6 Gyr, thus leaving a red dwarf galaxy. |
| format | Article |
| id | doaj-art-97280d772e0c4ebb91c3e44bc7ca61ab |
| institution | OA Journals |
| issn | 1687-7969 1687-7977 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Astronomy |
| spelling | doaj-art-97280d772e0c4ebb91c3e44bc7ca61ab2025-08-20T02:09:51ZengWileyAdvances in Astronomy1687-79691687-79772015-01-01201510.1155/2015/274968274968UGC 7639: A Dwarf Galaxy in the Canes Venatici I CloudL. M. Buson0D. Bettoni1P. Mazzei2G. Galletta3INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyINAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyINAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyDipartimento di Fisica e Astronomia, Vicolo dell’Osservatorio 2, 35122 Padova, ItalyWe want to get insight into the formation mechanism and the evolution of UGC 7639, a dwarf galaxy in the Canes Venatici I Cloud (CVnIC). We used archival multiwavelength data to constrain its global properties. Ultraviolet images show that UGC 7639 inner regions are composed mostly by young stellar populations. In addition, we used smoothed particle hydrodynamics simulations with chemophotometric implementation to account for its formation and evolution. UGC 7639 is an example of blue dwarf galaxy whose global properties are well matched by our multiwavelength approach, that is, a suitable approach to highlight the evolution also of these galaxies as a class. We found that the global properties of UGC 7639, namely, its total absolute B-band magnitude, its whole spectral energy distribution, and morphology, are well matched by an encounter with a system four times more massive than our target. Moreover, the current star formation rate of the simulated dwarf, ≈0.03 M⊙ yr−1, is in good agreement with our UV-based estimate. We derived a galaxy age of 8.6 Gyr. Following our simulation, the ongoing star formation will extinguish within 1.6 Gyr, thus leaving a red dwarf galaxy.http://dx.doi.org/10.1155/2015/274968 |
| spellingShingle | L. M. Buson D. Bettoni P. Mazzei G. Galletta UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud Advances in Astronomy |
| title | UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud |
| title_full | UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud |
| title_fullStr | UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud |
| title_full_unstemmed | UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud |
| title_short | UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud |
| title_sort | ugc 7639 a dwarf galaxy in the canes venatici i cloud |
| url | http://dx.doi.org/10.1155/2015/274968 |
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