A New Member of the Milky Way’s Family Tree: Characterizing the Pontus Merger of Our Galaxy
We study the Pontus structure—a recently discovered merger that brought in ∼7 globular clusters in the course of the hierarchical buildup of the Milky Way’s halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metal...
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| Veröffentlicht in: | Astrophysical journal. Letters 2022-05, Vol.930 (1), p.L9 |
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| creator | Malhan, Khyati |
| description | We study the Pontus structure—a recently discovered merger that brought in ∼7 globular clusters in the course of the hierarchical buildup of the Milky Way’s halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metallicity and chemical abundances (i.e., [Fe/H], [
α
/Fe], [Mg/Fe], and [Al/Fe]) using the spectroscopic catalog of APOGEE DR17, and (3) the color–magnitude diagram that shows interesting features, including a possibly double horizontal branch and a small population of blue stragglers. In sum, the Pontus stars show some unique properties that suggest they likely originated from the merging of an independent satellite galaxy; however, future analysis will shed more light on the true nature of this structure. This chemodynamical analysis of Pontus stars is another step forward in our bigger quest to characterize all the merging events of our Milky Way. |
| doi_str_mv | 10.3847/2041-8213/ac67da |
| format | Article |
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α
/Fe], [Mg/Fe], and [Al/Fe]) using the spectroscopic catalog of APOGEE DR17, and (3) the color–magnitude diagram that shows interesting features, including a possibly double horizontal branch and a small population of blue stragglers. In sum, the Pontus stars show some unique properties that suggest they likely originated from the merging of an independent satellite galaxy; however, future analysis will shed more light on the true nature of this structure. This chemodynamical analysis of Pontus stars is another step forward in our bigger quest to characterize all the merging events of our Milky Way.</description><identifier>ISSN: 2041-8205</identifier><identifier>EISSN: 2041-8213</identifier><identifier>DOI: 10.3847/2041-8213/ac67da</identifier><language>eng</language><publisher>Austin: The American Astronomical Society</publisher><subject>Aluminum ; Astronomy & Astrophysics ; ASTRONOMY AND ASTROPHYSICS ; Chemical abundances ; Family trees ; Galaxies ; Galaxy formation ; Galaxy kinematics ; Globular clusters ; Iron ; Magnesium ; Metallicity ; Milky Way ; Milky Way stellar halo ; Satellites ; Surveys</subject><ispartof>Astrophysical journal. Letters, 2022-05, Vol.930 (1), p.L9</ispartof><rights>2022. The Author(s). Published by the American Astronomical Society.</rights><rights>2022. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c407t-7c869d1097cf26ab03921ba119f6954560303bc02fd4c173dc4b4e226ab8546e3</citedby><cites>FETCH-LOGICAL-c407t-7c869d1097cf26ab03921ba119f6954560303bc02fd4c173dc4b4e226ab8546e3</cites><orcidid>0000-0002-8318-433X ; 000000028318433X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8213/ac67da/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>230,314,776,780,860,881,27901,27902,38845,38867,53815,53842</link.rule.ids><backlink>$$Uhttps://www.osti.gov/servlets/purl/1983324$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Malhan, Khyati</creatorcontrib><creatorcontrib>US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)</creatorcontrib><title>A New Member of the Milky Way’s Family Tree: Characterizing the Pontus Merger of Our Galaxy</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We study the Pontus structure—a recently discovered merger that brought in ∼7 globular clusters in the course of the hierarchical buildup of the Milky Way’s halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metallicity and chemical abundances (i.e., [Fe/H], [
α
/Fe], [Mg/Fe], and [Al/Fe]) using the spectroscopic catalog of APOGEE DR17, and (3) the color–magnitude diagram that shows interesting features, including a possibly double horizontal branch and a small population of blue stragglers. In sum, the Pontus stars show some unique properties that suggest they likely originated from the merging of an independent satellite galaxy; however, future analysis will shed more light on the true nature of this structure. 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Office of Science, Sloan Digital Sky Survey (SDSS)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A New Member of the Milky Way’s Family Tree: Characterizing the Pontus Merger of Our Galaxy</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2022-05-01</date><risdate>2022</risdate><volume>930</volume><issue>1</issue><spage>L9</spage><pages>L9-</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We study the Pontus structure—a recently discovered merger that brought in ∼7 globular clusters in the course of the hierarchical buildup of the Milky Way’s halo. Here, we analyze the stellar population of Pontus and examine (1) its phase-space distribution using the ESA/Gaia data set, (2) its metallicity and chemical abundances (i.e., [Fe/H], [
α
/Fe], [Mg/Fe], and [Al/Fe]) using the spectroscopic catalog of APOGEE DR17, and (3) the color–magnitude diagram that shows interesting features, including a possibly double horizontal branch and a small population of blue stragglers. In sum, the Pontus stars show some unique properties that suggest they likely originated from the merging of an independent satellite galaxy; however, future analysis will shed more light on the true nature of this structure. This chemodynamical analysis of Pontus stars is another step forward in our bigger quest to characterize all the merging events of our Milky Way.</abstract><cop>Austin</cop><pub>The American Astronomical Society</pub><doi>10.3847/2041-8213/ac67da</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-8318-433X</orcidid><orcidid>https://orcid.org/000000028318433X</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Institute of Physics IOPscience extra; DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; Institute of Physics Open Access Journal Titles; Alma/SFX Local Collection |
| subjects | Aluminum Astronomy & Astrophysics ASTRONOMY AND ASTROPHYSICS Chemical abundances Family trees Galaxies Galaxy formation Galaxy kinematics Globular clusters Iron Magnesium Metallicity Milky Way Milky Way stellar halo Satellites Surveys |
| title | A New Member of the Milky Way’s Family Tree: Characterizing the Pontus Merger of Our Galaxy |
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