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{{Short description|Galaxy in the constellation Virgo}}
{{Sections|date=January 2025}}
Speca, discovered in the year 2011, is an exotic ] or a galaxy where the central ] is actively accreting matter surrounding itself and ejects two giant, million light year long, plasma lobes in opposite directions<ref>{{Cite web |title=Exotic Galaxy Reveals Tantalizing Tale |url=https://www.nrao.edu/pr/2011/spiralradio/ |access-date=2025-01-06 |website=www.nrao.edu}}</ref><ref>{{Cite journal |last=Hota |first=Ananda |last2=Sirothia |first2=S. K. |last3=Ohyama |first3=Youichi |last4=Konar |first4=C. |last5=Kim |first5=Suk |last6=Rey |first6=Soo-Chang |last7=Saikia |first7=D. J. |last8=Croston |first8=J. H. |last9=Matsushita |first9=Satoki |date=2011-10-01 |title=Discovery of a spiral-host episodic radio galaxy |url=https://academic.oup.com/mnrasl/article/417/1/L36/1038380 |journal=Monthly Notices of the Royal Astronomical Society: Letters |volume=417 |issue=1 |pages=L36–L40 |doi=10.1111/j.1745-3933.2011.01115.x |issn=1745-3925}}</ref> . It was discovered by an international team of astronomers 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. '''Speca''', discovered in 2011, is an exotic ] or a galaxy where the central ] is actively ] matter surrounding itself and ejects two giant, million light year long, plasma lobes in opposite directions.<ref>{{Cite web |title=Exotic Galaxy Reveals Tantalizing Tale |url=https://www.nrao.edu/pr/2011/spiralradio/ |access-date=2025-01-06 |website=www.nrao.edu}}</ref><ref>{{Cite journal |last=Hota |first=Ananda |last2=Sirothia |first2=S. K. |last3=Ohyama |first3=Youichi |last4=Konar |first4=C. |last5=Kim |first5=Suk |last6=Rey |first6=Soo-Chang |last7=Saikia |first7=D. J. |last8=Croston |first8=J. H. |last9=Matsushita |first9=Satoki |date=2011-10-01 |title=Discovery of a spiral-host episodic radio galaxy |url=https://academic.oup.com/mnrasl/article/417/1/L36/1038380 |journal=Monthly Notices of the Royal Astronomical Society: Letters |volume=417 |issue=1 |pages=L36–L40 |doi=10.1111/j.1745-3933.2011.01115.x |issn=1745-3925}}</ref>Speca is located around 1.9 billion ] away in the ].<ref>{{Cite web |title=By Name {{!}} NASA/IPAC Extragalactic Database |url=https://ned.ipac.caltech.edu/byname?objname=PGC+119230&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1 |access-date=2025-01-06 |website=ned.ipac.caltech.edu}}</ref><ref>{{Cite web |title=PGC 119230 - Galaxy - WIKISKY |url=https://wikisky.org/starview?object_type=2&object_id=391361 |access-date=2025-01-06 |website=wikisky.org}}</ref>


==Discovery and significance==
{{Uncategorized|date=January 2025}}
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<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==
{{reflist}}

]

Latest revision as of 01:08, 7 January 2025

Galaxy in the constellation Virgo

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

  1. "Exotic Galaxy Reveals Tantalizing Tale". www.nrao.edu. Retrieved 2025-01-06.
  2. 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.
  3. "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2025-01-06.
  4. "PGC 119230 - Galaxy - WIKISKY". wikisky.org. Retrieved 2025-01-06.
  5. 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.
  6. 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.
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