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Spanish astronomer discovers new energetic galaxy

Spanish astronomer discovers new energetic galaxy

2023-08-23 08:06:31

Spanish astronomer discovers new active galaxy
Pictures of the newfound galaxy. Credit score: Elio Quiroga Rodriguez (2023).

By analyzing the photographs of the Sombrero Galaxy obtained with the Hubble House Telescope (HST), Elio Quiroga Rodriguez of the Mid Atlantic College in Spain, has recognized a peculiar object, which turned out to be a galaxy internet hosting an energetic galactic nucleus (AGN). The discovering was reported in a paper printed August 11 on the pre-print server arXiv.

An AGN is a compact area on the heart of a galaxy, extra luminous than the encircling galaxy mild. Research present that AGNs are very energetic due both to the presence of a black gap or star formation exercise on the core of the galaxy.

Astronomers usually divide AGNs into two teams based mostly on emission line options. Kind 1 AGNs present broad and slender emission traces, whereas solely slender emission traces are current in Kind 2 AGNs. Nevertheless, observations revealed that some AGNs transition between completely different spectral sorts; subsequently, they had been dubbed changing-look (CL) AGNs.

Sombrero Galaxy (also referred to as Messier 104 or NGC 4594) is an unbarred spiral galaxy situated between the borders of the Virgo and Corvus constellations, some 31 million mild years away. With a mass of about 800 billion solar masses, it is likely one of the most huge objects within the Virgo galaxy cluster. It additionally hosts a wealthy system of globular clusters.

Rodriguez has just lately investigated HST photographs of the Sombrero Galaxy, focusing one explicit object in its halo. He discovered that this object, beforehand categorised as a globular cluster candidate, could also be a barred spiral galaxy of the SBc kind, with an AGN at its heart.

“Whereas learning HST photographs out there on the HST Legacy web site of the halo of M104 (HST proposal 9714, PI: Keith Noll), the creator noticed at 12:40:07.829-11:36:47.38 (in j2000) an object about 4 arcseconds in diameter. A research with VO instruments means that the article is a SBc galaxy with AGN (Seyfert),” the paper reads.

The item is cataloged within the Pan-STARRS1 information archive as PSO J190.0326-11.6132. By analyzing the information from the Aladin Sky Atlas RGB Rodriguez discovered that PSO J190.0326-11.6132 is a galaxy with a dominant central arm, nucleus and presumably two spiral arms with sizzling younger stars and mud. The astronomer proposes that the newfound galaxy ought to be named the “Iris Galaxy.”

The research discovered that PSO J190.0326-11.6132 has a radial velocity at a degree of 1,359 km/s. Rodriguez assumes that the article, if gravitationally certain to the Sombrero Galaxy, might be its satellite tv for pc with an angular dimension of round 1,000 mild years.

Nevertheless, the creator of the paper famous that if the Iris Galaxy isn’t related to the Sombrero Galaxy, its distance could also be some 65 million mild years. On this situation, the angular dimension of the newly detected ought to be about 71,000 mild years.

The X-ray emission luminosity of the Iris Galaxy was measured to be roughly 18 tredecillion erg/s, assuming a distance of 65 million mild years. Such luminosity signifies the presence of an active galactic nucleus, nevertheless additional observations are required as a way to decide whether or not it is a Kind 1 or Kind 2 AGN.

Extra info:
E. Quiroga, A peculiar galaxy close to M104, arXiv (2023). DOI: 10.48550/arxiv.2308.06187

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Spanish astronomer discovers new energetic galaxy (2023, August 21)
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