Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31342
DC FieldValueLanguage
dc.contributor.authorZhang, JSen_US
dc.contributor.authorLiu, Wen_US
dc.contributor.authorYan, YTen_US
dc.contributor.authorYu, HZen_US
dc.contributor.authorLiu, JTen_US
dc.contributor.authorZheng, YHen_US
dc.contributor.authorROMANO, Donatellaen_US
dc.contributor.authorZhang, ZYen_US
dc.contributor.authorWang, JZen_US
dc.contributor.authorChen, JLen_US
dc.contributor.authorWang, YXen_US
dc.contributor.authorZhang, WJen_US
dc.contributor.authorLu, HHen_US
dc.contributor.authorChen, LSen_US
dc.contributor.authorZou, YPen_US
dc.contributor.authorYang, HQen_US
dc.contributor.authorWen, Ten_US
dc.contributor.authorLu, FSen_US
dc.date.accessioned2022-01-21T14:53:56Z-
dc.date.available2022-01-21T14:53:56Z-
dc.date.issued2020en_US
dc.identifier.issn0067-0049en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12386/31342-
dc.description.abstractThe interstellar oxygen isotopic ratio of 18O/17O can reflect the relative amount of the secular enrichment by ejecta from high-mass versus intermediate-mass stars. Previous observations found a Galactic gradient of 18O/17O, i.e., low ratios in the Galactic center and large values in the Galactic disk, which supports the inside-out formation scenario of our Galaxy. However, there are not many observed objects and, in particular, there are not many at large galactocentric distances. For this reason, we started a systematic study on Galactic interstellar 18O/17O, through observations of C18O and C17O multi-transition lines toward a large sample of 286 sources (at least one order of magnitude larger than previous ones), from the Galactic center region to the far outer Galaxy (∼22 kpc). In this article, we present our observations of J = 1-0 lines of C18O and C17O, with the 12 m antenna of the Arizona Radio Observatory (ARO 12 m) and the Institut de Radio Astronomie Millimétrique (IRAM) 30 m telescopes. Among our IRAM 30 m sample of 50 targets, we detected successfully both C18O and C17O 1-0 lines for 34 sources. Similarly, our sample of 260 targets for ARO 12 m observations resulted in the detection of both lines for 166 sources. The C18O optical depth effect on our ratio results, evaluated by fitting results of C17O spectra with hyperfine components (assuming τ C18O = 4τ C17O) and our radiative transfer and excitation model nonlocal thermodynamic equilibrium (non-LTE) model calculation for the strongest source, was found to be insignificant. Beam dilution does not seem to be a problem either, which was supported by the fact that there is no systematic variation between the isotopic ratio and the heliocentric distance, and ratios are consistently measured from two telescopes for most of those detected sources. With this study we obtained 18O/17O isotopic ratios for a large sample of molecular clouds with different galactocentric distances. Our results, though there are still very few detections made for sources in the outer Galaxy, confirm the apparent 18O/17O gradient of 18O/17O=(0.10 ± 0.03)R GC+(2.95 ± 0.30), with a Pearson's rank correlation coefficient of R = 0.69. This is supported by the newest Galactic chemical evolution model including the impact of massive stellar rotators and novae. Our future J = 2-1 and J = 3-2 observations of C18O and C17O toward the same sample would be important to determine their physical parameters (opacities, abundances, etc.) and further accurately determine the Galactic radial gradient of the isotopic ratio 18O/17O.en_US
dc.language.isoengen_US
dc.titleA Systematic Observational Study on Galactic Interstellar Ratio O-18/O-17. I. (CO)-O-18 and (CO)-O-17 J=1-0 Data Analysisen_US
dc.typeArticle-
dc.identifier.doi10.3847/1538-4365/ab9112en_US
dc.identifier.scopus2-s2.0-85088050387en_US
dc.identifier.isiWOS:000545657100001en_US
dc.identifier.urlhttps://iopscience.iop.org/article/10.3847/1538-4365/ab9112en_US
dc.identifier.urlhttps://api.elsevier.com/content/abstract/scopus_id/85088050387en_US
dc.relation.mediumSTAMPAen_US
dc.relation.volume249en_US
dc.relation.issue1en_US
dc.relation.firstpage6en_US
dc.relation.numberofpages15en_US
dc.type.refereeREF_1en_US
dc.description.internationalsìen_US
dc.relation.scientificsectorFIS/05 - ASTRONOMIA E ASTROFISICAen_US
dc.relation.journalTHE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIESen_US
dc.type.miur262 Articolo in rivista-
dc.identifier.adsbibcode2020ApJS..249....6Zen_US
dc.relation.ercsectorScienze Fisiche Settori ERC (ERC) di riferimento::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentationen_US
dc.description.apcnoen_US
dc.description.oa1 – prodotto con file in versione Open Access (allegare il file al passo  5-Carica)en_US
item.openairetypeArticle-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.fulltextWith Fulltext-
crisitem.journal.journalissn0067-0049-
crisitem.journal.anceE016254-
crisitem.author.deptOAS Bologna-
crisitem.author.orcid0000-0002-0845-6171-
Appears in Collections:1.01 Articoli in rivista
Files in This Item:
File Description SizeFormat
2007.00361.pdfpreprint2.86 MBAdobe PDFView/Open
Zhang_2020_ApJS_249_6.pdf[Administrators only]1.65 MBAdobe PDF
Show simple item record

Page view(s)

10
checked on Jun 29, 2022

Download(s)

5
checked on Jun 29, 2022

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE