Indian astronomers have carried out a multiwavelength research of a gamma-ray emitting compact symmetric object often called DA 362. Results of the research, introduced in a analysis paper revealed December 17 on the pre-print server arXiv, yield extra insights into the character of this enigmatic object.
Compact symmetric objects (CSOs) are younger jetted lively galactic nuclei (AGN) with an general projected dimension beneath 3,300 gentle years. Although CSOs are nonetheless not effectively investigated, observations discovered that they showcase symmetric radio morphologies and are prone to be within the early phases of their evolution with kinematic ages smaller than just a few thousand years. To date, solely 4 CSOs have been discovered to emit gamma-rays.
The latest gamma-ray emitting CSO is DA 362, often known as B2 1413+34. It was initially categorised as a blazar candidate of unsure sort, related to a gamma-ray supply designated 4FGL J1416.0+3443.
Recently, a workforce of astronomers led by Subhashree Swain of the Inter-University Center for Astronomy and Astrophysics in Pune, India, has analyzed long-term multiwavelength information concerning DA 362 from the Large Area Telescope (LAT) onboard NASA’s Fermi gamma-ray house telescope and from NASA’s Swift satellite tv for pc. The evaluation allowed them to research the character of this CSO.
“In this work, now we have studied the multiwavelength properties of a CSO DA 362, which was just lately discovered to be a gamma-ray emitter by the Fermi-LAT, thereby making it solely the fourth gamma-ray detected object of this class of AGN,” the researchers wrote.
The evaluation of the LAT information confirmed the affiliation of the gamma-ray supply 4FGL J1416.0+3443 with DA 362. It turned out that the optimized gamma-ray place was per the radio supply inside the estimated 95 p.c gamma-ray uncertainty area.
The gamma-ray gentle curve of DA 362 exhibits that the supply remained largely in quiescence throughout the first 12 years of LAT observations (between 2008 and 2020). However, the observations additionally revealed a flaring exercise of DA 362, which means that the gamma-ray emission originates almost certainly from its core or jet quite than from the radio lobes.
Furthermore, the research detected small, parsec-scale, bi-polar radio emission of DA 362 and located that its jet separation velocity is subluminal. These findings verify DA 362 as a real compact symmetric object.
By evaluating the gamma-ray spectral properties with the opposite three identified gamma-ray emitting CSOs, the astronomers discovered that DA 362 is the brightest amongst them and reveals a spectrum steeper than the opposite sources.
However, it turned out that DA 362 is extraordinarily faint within the optical band, which suggests potential mud obscuration.
The authors of the paper notice that deeper observations with delicate observing services needs to be performed with a purpose to discover the broadband bodily properties of this CSO and to additional probe the origin of its gamma-ray emission.
More data:
Subhashree Swain et al, DA 362: A Gamma-ray Emitting Compact Symmetric Object, arXiv (2024). DOI: 10.48550/arxiv.2412.12857
Journal data:
arXiv
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Study sheds extra gentle on the character of compact symmetric object DA 362 (2024, December 27)
retrieved 27 December 2024
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