| Revision as of 14:24, 6 January 2025 editJackarrrr (talk | contribs)Extended confirmed users505 editsm sd editTag: Visual edit← Previous edit | Revision as of 00:47, 7 January 2025 edit undoAru4wiki (talk | contribs)32 edits As per the advise to add citations to reliable sources, two more published journal references are added.Tag: Visual editNext edit → | ||
| Line 6: | Line 6: | ||
| Speca was discovered by an international team of ] led by Dr Ananda Hota, using archival data from ], ] and observations from the ]. Where almost all radio galaxies are hosted by massive, featureless, elliptical galaxies, Speca is the first confirmed exception that such giant plasma lobes can also be hosted by spiral galaxies. This confirmation came after 12 long years of the first suspected case ]. Speca was a convincing case because it has two, and possibly three, episodes of such plasma lobe emission and rotation of the spiral galaxy, fast and flat, is clearly observed. | Speca was discovered by an international team of ] led by Dr Ananda Hota, using archival data from ], ] and observations from the ]. Where almost all radio galaxies are hosted by massive, featureless, elliptical galaxies, Speca is the first confirmed exception that such giant plasma lobes can also be hosted by spiral galaxies. This confirmation came after 12 long years of the first suspected case ]. Speca was a convincing case because it has two, and possibly three, episodes of such plasma lobe emission and rotation of the spiral galaxy, fast and flat, is clearly observed. | ||
| Soon after this, search for Speca-like exotic objects were intensified, and in the next 12 years the total number increased to close to three dozen. Due to its exotic nature, some have started calling it Spiral DRAGNs, despite the word DRAGNs not used commonly for ]. The growing list can be found here ]<nowiki/>s . Since such galaxies are rarely seen in nearby Universe and elliptical galaxies were yet to form in the formative era of our Universe, it has been speculated that, Speca-like radio galaxies hosted in giant spirals may be more common in the young Universe. Future observations with giant optical telescopes (e.g. ], ] ) combined with sensitive observations with low frequency radio telescopes ( e.g. ], ] and ] ) may find many of them to understand galaxy evolution better. | Soon after this, search for Speca-like exotic objects were intensified, and in the next 12 years the total number increased to close to three dozen<ref>{{Cite journal |last=Gao |first=X. Y. |last2=Yuan |first2=Z. S. |last3=Han |first3=J. L. |last4=Wen |first4=Z. L. |last5=Shan |first5=S. S. |date=2023-03-01 |title=Three New Spiral Galaxies with Active Nuclei Producing Double Radio Lobes |url=https://iopscience.iop.org/article/10.1088/1674-4527/acb251 |journal=Research in Astronomy and Astrophysics |volume=23 |issue=3 |pages=035005 |doi=10.1088/1674-4527/acb251 |issn=1674-4527}}</ref>. Due to its exotic nature, some have started calling it Spiral DRAGNs, despite the word DRAGNs not used commonly for ]. The growing list can be found here ]<nowiki/>s . Since such galaxies are rarely seen in nearby Universe and elliptical galaxies were yet to form in the formative era of our Universe, it has been speculated that, Speca-like radio galaxies hosted in giant spirals may be more common in the young Universe<ref>{{Cite journal |last=Hota |first=Ananda |last2=Konar |first2=C. |last3=Stalin |first3=C. S. |last4=Vaddi |first4=Sravani |last5=Mohanty |first5=Pradeepta K. |last6=Dabhade |first6=Pratik |last7=Dharmik Bhoga |first7=Sai Arun |last8=Rajoria |first8=Megha |last9=Sethi |first9=Sagar |date=2016-12-10 |title=Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data |url=https://link.springer.com/article/10.1007/s12036-016-9415-8 |journal=Journal of Astrophysics and Astronomy |language=en |volume=37 |issue=4 |pages=41 |doi=10.1007/s12036-016-9415-8 |issn=0973-7758}}</ref>. Future observations with giant optical telescopes (e.g. ], ] ) combined with sensitive observations with low frequency radio telescopes ( e.g. ], ] and ] ) may find many of them to understand galaxy evolution better. | ||
| ==References== | ==References== | ||
Revision as of 00:47, 7 January 2025
Galaxy in the constellation Virgo | This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Speca" – news · newspapers · books · scholar · JSTOR (January 2025) (Learn how and when to remove this message) |
Speca, discovered in 2011, is an exotic radio galaxy or a galaxy where the central supermassive black hole is actively accreting matter surrounding itself and ejects two giant, million light year long, plasma lobes in opposite directions.Speca is located around 1.9 billion light-years away in the constellation Virgo.
Discovery and significance
Speca was discovered by an international team of astronomers led by Dr Ananda Hota, using archival data from Sloan Digital Sky Survey (SDSS), Very Large Array and observations from the Giant Meterwave Radio Telescope. Where almost all radio galaxies are hosted by massive, featureless, elliptical galaxies, Speca is the first confirmed exception that such giant plasma lobes can also be hosted by spiral galaxies. This confirmation came after 12 long years of the first suspected case ESO 0313-192. Speca was a convincing case because it has two, and possibly three, episodes of such plasma lobe emission and rotation of the spiral galaxy, fast and flat, is clearly observed.
Soon after this, search for Speca-like exotic objects were intensified, and in the next 12 years the total number increased to close to three dozen. Due to its exotic nature, some have started calling it Spiral DRAGNs, despite the word DRAGNs not used commonly for radio galaxies. The growing list can be found here List of Spiral DRAGNs . Since such galaxies are rarely seen in nearby Universe and elliptical galaxies were yet to form in the formative era of our Universe, it has been speculated that, Speca-like radio galaxies hosted in giant spirals may be more common in the young Universe. Future observations with giant optical telescopes (e.g. Thirty Metre telescope, Extremely Large Telescope ) combined with sensitive observations with low frequency radio telescopes ( e.g. LOFAR, Giant Meterwave Radio Telescope and Square Kilometre Array Observatory ) may find many of them to understand galaxy evolution better.
References
- "Exotic Galaxy Reveals Tantalizing Tale". www.nrao.edu. Retrieved 2025-01-06.
- Hota, Ananda; Sirothia, S. K.; Ohyama, Youichi; Konar, C.; Kim, Suk; Rey, Soo-Chang; Saikia, D. J.; Croston, J. H.; Matsushita, Satoki (2011-10-01). "Discovery of a spiral-host episodic radio galaxy". Monthly Notices of the Royal Astronomical Society: Letters. 417 (1): L36 – L40. doi:10.1111/j.1745-3933.2011.01115.x. ISSN 1745-3925.
- "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2025-01-06.
- "PGC 119230 - Galaxy - WIKISKY". wikisky.org. Retrieved 2025-01-06.
- Gao, X. Y.; Yuan, Z. S.; Han, J. L.; Wen, Z. L.; Shan, S. S. (2023-03-01). "Three New Spiral Galaxies with Active Nuclei Producing Double Radio Lobes". Research in Astronomy and Astrophysics. 23 (3): 035005. doi:10.1088/1674-4527/acb251. ISSN 1674-4527.
- Hota, Ananda; Konar, C.; Stalin, C. S.; Vaddi, Sravani; Mohanty, Pradeepta K.; Dabhade, Pratik; Dharmik Bhoga, Sai Arun; Rajoria, Megha; Sethi, Sagar (2016-12-10). "Tracking Galaxy Evolution Through Low-Frequency Radio Continuum Observations using SKA and Citizen-Science Research using Multi-Wavelength Data". Journal of Astrophysics and Astronomy. 37 (4): 41. doi:10.1007/s12036-016-9415-8. ISSN 0973-7758.