Table · dataset · 2022
NH3 isotope ratios of Galactic disk sources
Listed in IVOA Registry (Virtual Observatory)
Our aim is to measure the interstellar ^14^N/^15^N ratio across the Galaxy, to establish a standard data set on interstellar ammonia isotope ratios, and to provide new constraints on the Galactic chemical evolution.
Description
The (J,K)=(1,1), (2,2), and (3,3) lines of ^14^NH_3_ and ^15^NH_3_ were observed with the Shanghai Tianma 65m radio telescope (TMRT) and the Effelsberg 100m telescope toward a large sample of 210 sources. One hundred fourty-one of these sources were detected by the TMRT in ^14^NH_3_.
Eight of them were also detected in ^15^NH_3_. For 10 of the 36 sources with strong NH_3_ emission, the Effelsberg 100m telescope successfully detected their ^15^NH_3_(1,1) lines, including 3 sources (G081.7522, W51D, and Orion-KL) with detections by the TMRT telescope. Thus, a total of 15 sources are detected in both the ^14^NH_3_ and ^15^NH_3_ lines.
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Line and physical parameters for these 15 sources are derived, including optical depths, rotation and kinetic temperatures, and total column densities. ^14^N/^15^N isotope ratios were determined from the ^14^NH_3_/^15^NH_3_ abundance ratios. The isotope ratios obtained from both telescopes agree for a given source within the uncertainties, and no dependence on heliocentric distance and kinetic temperature is seen. ^14^N/^15^N ratios tend to increase with galactocentric distance, confirming a radial nitrogen isotope gradient.
This is consistent with results from recent Galactic chemical model calculations, including the impact of superasymptotic giant branch stars and novae.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/257/39 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021ApJS..257...39C ui.adsabs.harvard.edu/abs/2021ApJS..257...39C ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apjs/257/39 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Radio
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apjs/257/39 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:radio | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |