PGC 29820
{{Short description|Galaxy located in the constellation Sextans}}
{{Infobox galaxy|name=PGC 29820|image=File:PGC29820 Potw2315a.jpg|constellation name=Sextans|z=0.04244|dist_ly=600 Mly (183.96 Mpc)|size=120,000 ly|names=LEDA 29820, CGCG 008-077, 2dFGRS N288Z210, AGC 500048, NVSS J101346-005449, JO204|type=Sb(f), Seyfert 2|group_cluster=Abell 957|epoch=J2000|ra=10h 13m 46.82s|dec=-00d 54m 51.0s|h_radial_v=12,723 km/s|appmag_v=0.11|appmag_b=0.15|caption=PGC 29820 imaged by the Hubble Space Telescope}}
{{Use dmy dates|date=December 2024}}
PGC 29820 (known as JO204) is a spiral galaxy 600 million light-years from the Solar System, in the Sextans constellation.{{Cite web |title=Your NED Search Results |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=22290&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |access-date=2024-04-18 |website=ned.ipac.caltech.edu}} The galaxy is about 120,000 light-years in diameter and is a member of Abell 957, a low-mass galaxy cluster.{{Cite journal |last1=Gullieuszik |first1=Marco |last2=Poggianti |first2=Bianca M. |last3=Moretti |first3=Alessia |last4=Fritz |first4=Jacopo |last5=Jaffé |first5=Yara L. |last6=Hau |first6=George |last7=Bischko |first7=Jan C. |last8=Bellhouse |first8=Callum |last9=Bettoni |first9=Daniela |last10=Fasano |first10=Giovanni |last11=Vulcani |first11=Benedetta |last12=D'Onofrio |first12=Mauro |last13=Biviano |first13=Andrea |date=1 September 2017 |title=GASP. IV. A Muse View of Extreme Ram-pressure-stripping in the Plane of the Sky: The Case of Jellyfish Galaxy JO204 |journal=The Astrophysical Journal |volume=846 |issue=1 |pages=27 |doi=10.3847/1538-4357/aa8322 |doi-access=free |arxiv=1708.09035 |bibcode=2017ApJ...846...27G |issn=0004-637X}} The first known reference to this galaxy is from volume I of the Catalogue of Galaxies and of Clusters of Galaxies compiled by Fritz Zwicky in 1961, where it was listed as CGCG 008-077.{{cite book|bibcode=1961cgcg.book.....Z |date=1961 |title=Catalogue of galaxies and of clusters of galaxies, Vol. I |last1=Zwicky |first1=F. |last2=Herzog |first2=E. |last3=Wild |first3=P. | url = https://ui.adsabs.harvard.edu/abs/1961cgcg.book.....Z/abstract | archive-url = https://authors.library.caltech.edu/records/5mzw0-jg109 | archive-date = 19 August 2023 | page = 26 }}
Characteristics
PGC 29820 is classified a massive galaxy with a stellar mass of M* = 4 x1010 M.{{Cite journal |last1=Deb |first1=Tirna |last2=Verheijen |first2=Marc A W |last3=Gullieuszik |first3=Marco |last4=Poggianti |first4=Bianca M |last5=van Gorkom |first5=Jacqueline H |last6=Ramatsoku |first6=Mpati |last7=Serra |first7=Paolo |last8=Moretti |first8=Alessia |last9=Vulcani |first9=Benedetta |last10=Bettoni |first10=Daniela |last11=Jaffé |first11=L Yara |last12=Tonnesen |first12=Stephanie |last13=Fritz |first13=Jacopo |date=23 April 2020 |title=GASP XXV: neutral hydrogen gas in the striking jellyfish galaxy JO204 |journal=Monthly Notices of the Royal Astronomical Society |volume=494 |issue=4 |pages=5029–5043 |doi=10.1093/mnras/staa968 |doi-access=free |issn=0035-8711|arxiv=2004.04754 }} It contains an active galactic nucleus with double-peaked narrow lines.{{Cite journal |last1=Wang |first1=Jian-Min |last2=Chen |first2=Yan-Mei |last3=Hu |first3=Chen |last4=Mao |first4=Wei-Ming |last5=Zhang |first5=Shu |last6=Bian |first6=Wei-Hao |date=1 November 2009 |title=Active Galactic Nuclei with Double-Peaked Narrow Lines: Are they Dual Active Galactic Nuclei? |url=https://ui.adsabs.harvard.edu/abs/2009ApJ...705L..76W |journal=The Astrophysical Journal |volume=705 |issue=1 |pages=L76–L80 |doi=10.1088/0004-637X/705/1/L76 |arxiv=0910.0580 |bibcode=2009ApJ...705L..76W |issn=0004-637X}}{{Cite journal |last1=Nevin |first1=R. |last2=Comerford |first2=J. |last3=Müller-Sánchez |first3=F. |last4=Barrows |first4=R. |last5=Cooper |first5=M. |date=1 November 2016 |title=The Origin of Double-peaked Narrow Lines in Active Galactic Nuclei. II. Kinematic Classifications for the Population at z < 0.1 |journal=The Astrophysical Journal |volume=832 |issue=1 |pages=67 |doi=10.3847/0004-637X/832/1/67 |doi-access=free |arxiv=1609.04018 |bibcode=2016ApJ...832...67N |issn=0004-637X}} Moreover, it is also a Seyfert 2 galaxy.{{Cite journal |last1=Véron-Cetty |first1=M. -P. |last2=Véron |first2=P. |date=1 August 2006 |title=A catalogue of quasars and active nuclei: 12th edition |url=https://ui.adsabs.harvard.edu/abs/2006A&A...455..773V |journal=Astronomy and Astrophysics |volume=455 |issue=2 |pages=773–777 |doi=10.1051/0004-6361:20065177 |bibcode=2006A&A...455..773V |issn=0004-6361}}
PGC 29820 is classified a jellyfish galaxy.{{Cite web |last=information@eso.org |title=A jellyfish and the ram |url=https://www.spacetelescope.org/images/potw2315a/ |access-date=2024-04-18 |website=www.spacetelescope.org |language=en}}{{Cite journal |last1=Poggianti |first1=B. M. |last2=Fasano |first2=G. |last3=Omizzolo |first3=A. |last4=Gullieuszik |first4=M. |last5=Bettoni |first5=D. |last6=Moretti |first6=A. |last7=Paccagnella |first7=A. |last8=Jaffé |first8=Y. L. |last9=Vulcani |first9=B. |last10=Fritz |first10=J. |last11=Couch |first11=W. |last12=D'Onofrio |first12=M. |date=1 March 2016 |title=Jellyfish Galaxy Candidates at Low Redshift |journal=The Astronomical Journal |volume=151 |issue=3 |pages=78 |doi=10.3847/0004-6256/151/3/78 |doi-access=free |arxiv=1504.07105 |bibcode=2016AJ....151...78P |issn=0004-6256}}{{Cite web |title=Hubble Spots a Galaxy with Tendrils - NASA Science |url=https://science.nasa.gov/missions/hubble/hubble-spots-a-galaxy-with-tendrils/ |access-date=2024-07-26 |website=science.nasa.gov |language=en-US}} According to Gullieuszik, the galaxy is currently in a first phrase of infalling into the cluster where it is subjected to ram pressure by the intracluster medium.
Because dense gas is compressed, it eventually collapses to form new stars in both the galaxy's tail and its disk. According to researchers, the stars inside the tail, has a star formation rate of 0.22 M○ yr1{{Cite journal |last1=Poggianti |first1=Bianca M. |last2=Gullieuszik |first2=Marco |last3=Tonnesen |first3=Stephanie |last4=Moretti |first4=Alessia |last5=Vulcani |first5=Benedetta |last6=Radovich |first6=Mario |last7=Jaffé |first7=Yara |last8=Fritz |first8=Jacopo |last9=Bettoni |first9=Daniela |last10=Franchetto |first10=Andrea |last11=Fasano |first11=Giovanni |last12=Bellhouse |first12=Callum |last13=Omizzolo |first13=Alessandro |date=1 February 2019 |title=GASP XIII. Star formation in gas outside galaxies |journal=Monthly Notices of the Royal Astronomical Society |volume=482 |issue=4 |pages=4466–4502 |doi=10.1093/mnras/sty2999 |doi-access=free |arxiv=1811.00823 |bibcode=2019MNRAS.482.4466P |issn=0035-8711}} which began during the last 500 million years.
In additional, PGC 29820 shows a large presence of molecular gas making up H2 mass of 8.3 billion M○. Looking at ratio of total molecular hydrogen mass and stellar mass, it is estimated as 0.42.{{Cite journal |last1=Moretti |first1=A. |last2=Paladino |first2=R. |last3=Poggianti |first3=B. M. |last4=D'Onofrio |first4=M. |last5=Bettoni |first5=D. |last6=Gullieuszik |first6=M. |last7=Jaffé |first7=Y. L. |last8=Vulcani |first8=B. |last9=Fasano |first9=G. |last10=Fritz |first10=J. |last11=Torstensson |first11=K. |date=1 October 2018 |title=GASP – X. APEX observations of molecular gas in the discs and in the tails of ram-pressure stripped galaxies |journal=Monthly Notices of the Royal Astronomical Society |volume=480 |issue=2 |pages=2508–2520 |doi=10.1093/mnras/sty2021 |doi-access=free |arxiv=1803.06183 |bibcode=2018MNRAS.480.2508M |issn=0035-8711}}
See also
References
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