The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II
RR Lyrae in ultrafaint dwarf (UFD) galaxies, if found, would be valuable to constrain the distances of these UFD. In this work, we report our search of RR Lyrae in a recently discovered UFD—Sextans II. Based on multiband (griz) time-series archival DECam imaging data, we do not find any RR Lyrae in...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-3881/ada031 |
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| author | Chow-Choong Ngeow Anupam Bhardwaj |
| author_facet | Chow-Choong Ngeow Anupam Bhardwaj |
| author_sort | Chow-Choong Ngeow |
| collection | DOAJ |
| description | RR Lyrae in ultrafaint dwarf (UFD) galaxies, if found, would be valuable to constrain the distances of these UFD. In this work, we report our search of RR Lyrae in a recently discovered UFD—Sextans II. Based on multiband (griz) time-series archival DECam imaging data, we do not find any RR Lyrae in Sextans II. On the contrary, the sparse multiband DECam light curves allowed recovery of a known foreground RR Lyrae, BB Sex, which happened to fall within the DECam images, and its pulsation period was correctly identified. Therefore, it is possible that Sextans II lacks RR Lyrae, similar to several other fainter UFDs (with M _V ≳ −5.0 mag) that do not have RR Lyrae. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astronomical Journal |
| spelling | doaj-art-cf4b930a7373447bbfbff1a9245b6acc2025-01-14T08:21:07ZengIOP PublishingThe Astronomical Journal1538-38812025-01-0116926810.3847/1538-3881/ada031The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans IIChow-Choong Ngeow0https://orcid.org/0000-0001-8771-7554Anupam Bhardwaj1https://orcid.org/0000-0001-6147-3360Graduate Institute of Astronomy, National Central University , 300 Jhongda Road, 32001 Jhongli, Taiwan ; cngeow@astro.ncu.edu.twInter-University Center for Astronomy and Astrophysics (IUCAA) , Post Bag 4, Ganeshkhind, Pune 411 007, IndiaRR Lyrae in ultrafaint dwarf (UFD) galaxies, if found, would be valuable to constrain the distances of these UFD. In this work, we report our search of RR Lyrae in a recently discovered UFD—Sextans II. Based on multiband (griz) time-series archival DECam imaging data, we do not find any RR Lyrae in Sextans II. On the contrary, the sparse multiband DECam light curves allowed recovery of a known foreground RR Lyrae, BB Sex, which happened to fall within the DECam images, and its pulsation period was correctly identified. Therefore, it is possible that Sextans II lacks RR Lyrae, similar to several other fainter UFDs (with M _V ≳ −5.0 mag) that do not have RR Lyrae.https://doi.org/10.3847/1538-3881/ada031RR Lyrae variable starsDwarf galaxiesWide-field telescopes |
| spellingShingle | Chow-Choong Ngeow Anupam Bhardwaj The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II The Astronomical Journal RR Lyrae variable stars Dwarf galaxies Wide-field telescopes |
| title | The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II |
| title_full | The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II |
| title_fullStr | The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II |
| title_full_unstemmed | The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II |
| title_short | The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II |
| title_sort | lack of rr lyrae variables in ultrafaint dwarf galaxy sextans ii |
| topic | RR Lyrae variable stars Dwarf galaxies Wide-field telescopes |
| url | https://doi.org/10.3847/1538-3881/ada031 |
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