Radio and X-ray properties of the source G29.37+0.1 linked to HESS J1844-030

Abstract

Using observations carried out with the GMRT, we performed high-quality full-synthesis imaging at 610 MHz of the source G29.37+0.1, which is an as-yet-unclassified object linked to the TeV source HESS J1844-030. These data, combined with observations at 1400 MHz from MAGPIS were used to investigate the properties of its radio emission. Additionally, we reprocessed XMM-Newton and Chandra archival data. G29.37+0.1 mainly consists of a bright twisted structure, named the S-shaped feature. The high sensitivity of the new GMRT observations allowed the identification of potential lobes, jets, and a nuclear central region in the S-shaped morphology of G29.37+0.1. We also highlight the detection of diffuse and low surface brightness emission enveloping the brightest emitting regions. The brightest emission in G29.37+0.1 has a radio synchrotron spectral index 0.59+/-0.09. Variations in the spectral behavior are observed across the whole radio source with the flattest spectral features in the central nuclear and jets components (alpha~0.3). These results lead us to conclude that the brightest radio emission from G29.37+0.1 likely represents a newly recognized radio galaxy. The identification of optical and infrared counterparts to the emission from the core of G29.37+0.1 strengthens our interpretation of an extragalactic origin of the radio emission. Our spectral analysis demonstrated that a non-thermal origin for the X-ray emission compatible with a pulsar wind nebula is quite possible. The analysis of the spatial distribution of the CO gas revealed the presence of a complex of molecular clouds located in projection adjacent to the radio halo emission and probably interacting with it. We propose that the faint halo represents a composite supernova remnant with a pulsar powered component given by the diffuse X-ray emission superimposed along the line of sight to the radio galaxy.

12 figures, accepted to be published in Astronomy and Astrophysics Main Journal

References in corpus (16)

• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• The VLA Galactic Plane Survey
• The 1st Fermi Lat Supernova Remnant Catalog
• Fermi Gamma-ray Imaging of a Radio Galaxy
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• A multifrequency study of giant radio sources-II. Spectral ageing analysis of the lobes of selected sources
• FR II radio galaxies at low frequencies I: morphology, magnetic field strength and energetics
• Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes
• A multifrequency study of giant radio sources I. Low-frequency Giant Metrewave Radio Telescope observations of selected sources
• Search for TeV Gamma-Ray Emission from Point-like Sources in the Inner Galactic Plane with a Partial Configuration of the HAWC Observatory
• Radio Lobes of Pictor A: an X-ray spatially resolved Study
• The new sample of giant radio sources III. Statistical trends and correlations
• LOFAR VLBI Studies at 55 MHz of 4C 43.15, a z=2.4 Radio Galaxy

Cited by in corpus (5)

• A global view on star formation: The GLOSTAR Galactic plane survey. II. Supernova Remnants in the first quadrant of the Milky Way
• The LHAASO PeVatron bright sky: what we learned
• New composite supernova remnant toward HESS J1844-030?
• A Multiwavelength Machine-learning Approach to Classifying X-ray Sources in the Fields of Unidentified 4FGL-DR4 sources
• 4FGL J1844.4-0306: high-energy emission likely from the supernova remnant G29.37+0.1