Table · dataset · 2007
Radio continuum survey of M33
Listed in IVOA Registry (Virtual Observatory)
We study the exponential scale length of total radio emission, the spectral index distribution, and the linear radio polarization in the Scd galaxy M33.
Description
Observations were carried out using the 3.6cm dual channel and the 6.2cm four-channel receivers of the 100-m Effelsberg telescope along with the L-band VLA D-array at 20cm. High spatial resolution and sensitivity in both total and linearly polarized radio continuum emission from M33 were achieved.
We found considerable extended emission, not only from the main arms IS and IN, but also from the weaker arms. The large-scale magnetic field exhibits well-ordered spiral structure with almost the same orientation as that of the optical spiral arms; however, it does not show a clear structural correlation or anti-correlation with the optical arms. There is a north-south asymmetry in polarization that is frequency-dependent.
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We found that the ring mean spectral index versus radius increases faster beyond R=4kpc. At each wavelength, the exponential scale length is larger inside than outside R=4kpc. From the larger scale lengths at R<4kpc, we conclude that star-forming regions are mainly spread over the region R<4kpc without a dominant nuclear concentration.
Furthermore, at R>4kpc, a spatial correlation between cosmic rays and star-forming regions may exist. From the behavior of the mean spectral indices obtained from different pairs of the radio continuum data at 3.6, 6.2, and 20cm, we confirm that a decrease in the thermal fraction causes an increase in the spectral index.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/472/785 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2007A&A...472..785T ui.adsabs.harvard.edu/abs/2007A%26A...472..785T ↗
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/a%2Ba/472/785 ↗
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/a+a/472/785 | 11 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 |