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| G345.5+1.0 | |
|---|---|
| Name | G345.5+1.0 |
| Type | Astronomical radio source |
| Epoch | J2000 |
| Constellation | Scorpius |
| Ra | 16h 56m (approx.) |
| Dec | -40° (approx.) |
| Distance | ~2–6 kpc (est.) |
G345.5+1.0 G345.5+1.0 is a Galactic radio source catalogued in radio continuum surveys of the southern sky. It was identified in surveys that include targeted work by observatories such as the Molonglo Observatory Synthesis Telescope, the Australia Telescope Compact Array, and all-sky maps originating from the Parkes Observatory and the Very Large Array legacy projects. The object has been discussed in the context of supernova remnants, H II regions, and molecular cloud complexes studied by teams affiliated with institutions like the CSIRO and the National Radio Astronomy Observatory.
The designation follows the Galactic coordinate convention used in catalogs compiled by survey projects such as the Molonglo Catalogue and the Parkes-MIT-NRAO (PMN) Surveys. Identification has involved cross-matching with the IRAS Point Source Catalog, the Midcourse Space Experiment catalogs, and later compilations from the Spitzer Space Telescope programs. Nomenclature practices derive from standards established by the International Astronomical Union and data products distributed by archives like the NASA/IPAC Infrared Science Archive and the Centre de Données astronomiques de Strasbourg.
G345.5+1.0 first appeared in southern radio continuum work contemporaneous with surveys by the Molonglo Observatory Synthesis Telescope and the Parkes 64m Telescope during the late 20th century. Follow-up observations were conducted with interferometers including the Australia Telescope Compact Array and the Very Large Array in synthesis mode, and were later compared with infrared maps from the Infrared Astronomical Satellite and the Spitzer Space Telescope. Millimetre and submillimetre studies have used facilities such as the Atacama Pathfinder Experiment and the Atacama Large Millimeter/submillimeter Array for molecular line follow-up. Catalog entries and analyses have appeared in publications associated with research groups at the University of Sydney, the Commonwealth Scientific and Industrial Research Organisation, and the Max Planck Institute for Radio Astronomy.
Radio continuum morphology shows structured emission consistent with shell-like or filamentary forms seen in objects such as the Vela Supernova Remnant and the Cygnus Loop. Spectral index measurements from multi-band radio data compare to synchrotron-emitting remnants catalogued in the Green Catalogue of Galactic Supernova Remnants and thermal H II regions like those in the Westerhout Catalogue. Molecular line detections (for example in CO transitions) associate physical conditions similar to clumps identified within the Orion Molecular Cloud Complex and the Carina Nebula. Estimates of electron density and magnetic field strength rely on techniques used for sources such as the Crab Nebula and the Cassiopeia A remnant.
Distance estimates for the source employ methods analogous to those applied to objects near the Scutum-Centaurus Arm and the Sagittarius Arm, including kinematic distances based on rotation curves used by studies of the Milky Way and maser parallax comparisons like those performed with the Very Long Baseline Array. Suggested distances place the source within a few kiloparsecs, overlapping environments populated by molecular clouds similar to those in the Rho Ophiuchi cloud complex and star-forming regions comparable to NGC 6334. The ambient interstellar medium conditions are assessed with reference to surveys by the James Clerk Maxwell Telescope and extinction maps produced by the Two Micron All Sky Survey.
Infrared counterparts have been sought in datasets from the IRAS Point Source Catalog, the Midcourse Space Experiment, and the Spitzer GLIMPSE program, invoking comparison to infrared-bright regions like the Trifid Nebula and the Lagoon Nebula. X-ray searches reference catalogs from the ROSAT All-Sky Survey and pointed observations by the XMM-Newton and Chandra X-ray Observatory for high-energy emission akin to that from the Puppis A remnant. Submillimetre continuum and molecular line work utilize facilities such as the APEX Telescope and the James Clerk Maxwell Telescope, with analysis methods comparable to those applied to the Perseus Molecular Cloud and the Taurus Molecular Cloud.
The region has been examined for associations with compact objects, masers, and young stellar objects by analogy with searches yielding sources like SNR G347.3-0.5, W49A, and prominent maser sites studied by the Methanol Multibeam Survey. Catalog cross-matches include potential links to radio pulsars catalogued by the Australia Telescope National Facility and infrared clusters similar to those in the GLIMPSE Cluster Catalog. Larger-scale connections consider proximity to spiral arm features mapped by the BeSSeL Survey and CO surveys performed by the CfA 1.2 m Millimeter-Wave Telescope.
G345.5+1.0 serves as a target for investigating topics addressed in comparative studies of Galactic supernova remnants and H II regions compiled in the Green Catalogue of Galactic Supernova Remnants and the WISE Catalog of Galactic H II Regions. Research themes include shock physics studied in the context of the Fermi Gamma-ray Space Telescope discoveries, star formation feedback analogous to that in W51, and chemical evolution explored with techniques from studies of Sgr B2. Continued multiwavelength follow-up with instruments such as the ALMA Observatory and the Square Kilometre Array pathfinders is relevant for clarifying the nature of the source and its role in the interstellar medium.
Category:Galactic radio sources