{{Short description|Radio galaxy in the constellation Draco}} {{Infobox galaxy|name=4C +72.26|epoch=[[J2000.0]]|constellation name=[[Draco (constellation)|Draco]]|ra=19h 08m 23.90s|dec=+72d 20m 04.90s|z=3.536000|h_radial_v=1,060,066 [[kilometer per second|km/s]]|dist_ly=11.526 [[light year|Gly]] ([[light travel time]] distance)|appmag_v=0.436|appmag_b=0.577|sbrightness=21.4|type=HzRG|notes=[[Radio galaxy]], [[interacting galaxy]]|names=[[Principal Galaxies Catalogue|PGC]] 2821855, [[Sixth Cambridge Survey of Radio Sources|6C]] 1909+72, [[NRAO VLA Sky Survey|NVSS]] J190823+722009, [[Eighth Cambridge Survey|8C]] J1908+722, WN B1909.1+7215, 2CXO J190823.2+722005, NAME TX J1908+7220|image=File:Pan-STARRS Image of 4C +72.26.jpg|caption=4C +72.26 captured by [[Pan-STARRS]]}}

'''4C +72.26''' known as '''NAME TX J1908+7220''', is a [[radio galaxy]] located in the constellation [[Draco (constellation)|Draco]]. At the [[redshift]] of 3.53, the galaxy is located roughly 11.5 billion [[light-year]]s from [[Earth]].<ref>{{Cite web |title=Your NED Search Results |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=70844&objname=2&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 |access-date=2024-06-04 |website=ned.ipac.caltech.edu}}</ref>

== Characteristics == 4C +72.26 is one of the high redshift powerful radio galaxies.<ref>{{Cite journal |last1=Rocca-Volmerange |first1=B. |last2=Le Borgne |first2=D. |last3=De Breuck |first3=C. |last4=Fioc |first4=M. |last5=Moy |first5=E. |date=2004-03-01 |title=The radio galaxy K-z relation: The 1012 M⊙ mass limit. Masses of galaxies from the LK luminosity, up to z > 4 |url=https://ui.adsabs.harvard.edu/abs/2004A&A...415..931R |journal=Astronomy and Astrophysics |volume=415 |pages=931–940 |doi=10.1051/0004-6361:20031717 |arxiv=astro-ph/0311490 |bibcode=2004A&A...415..931R |issn=0004-6361}}</ref><ref>{{Cite web |title=Distant Radio Galaxies and their Environments - G.K. Miley & C. De Breuck |url=https://ned.ipac.caltech.edu/level5/Sept08/Miley/Miley9.html |access-date=2024-06-04 |website=ned.ipac.caltech.edu}}</ref> An [[Interacting galaxy|interacting pair]] of two vigorous [[Starburst galaxy|starburst galaxies]] separated by ~1300 ± 200&nbsp;km s<sup>−1</sup> in [[velocity]],<ref name=":0">{{Cite journal |last1=Smith |first1=D. J. B. |last2=Simpson |first2=C. |last3=Swinbank |first3=A. M. |last4=Rawlings |first4=S. |last5=Jarvis |first5=M. J. |title=When galaxies collide: understanding the broad absorption-line radio galaxy 4C +72.26 |journal=Monthly Notices of the Royal Astronomical Society|date=2010 |volume=404 |issue=3 |pages=1089–1099 |doi=10.1111/j.1365-2966.2010.16279.x |doi-access=free |arxiv=1001.2018 |bibcode=2010MNRAS.404.1089S }}</ref> 4C +72.26 is known to have tight locus following in the [[K-band multi-object spectrograph|K-band]] [[Hubble's law|Hubble diagram]], suggesting it as a [[Luminous efficacy|luminous]] (~3''L''*) galaxy with [[stellar population]]s forming rapidly at a very high redshift and such, evolved passively.<ref>{{Cite journal |last1=Lilly |first1=S. J. |last2=Longair |first2=M. S. |date=1982-06-01 |title=Infrared studies of a sample of 3C radio galaxies. |journal=Monthly Notices of the Royal Astronomical Society |volume=199 |issue=4 |pages=1053–1068 |doi=10.1093/mnras/199.4.1053 |doi-access=free |bibcode=1982MNRAS.199.1053L |issn=0035-8711}}</ref>

4C +72.26 is a massive [[galaxy]] lying inside the center of a [[galaxy cluster]] where [[Galaxy formation and evolution|galaxy formation]] is regulated and through growth by heating the [[intracluster medium]]. [[Energy]] that is released from the continued [[Accretion (astrophysics)|accretion]] of material, is then fueled towards its central [[supermassive black hole]].<ref>{{Cite journal |last1=Nesvadba |first1=N. P. H. |last2=Lehnert |first2=M. D. |last3=Eisenhauer |first3=F. |last4=Gilbert |first4=A. |last5=Tecza |first5=M. |last6=Abuter |first6=R. |date=2006-10-01 |title=Extreme Gas Kinematics in the z=2.2 Powerful Radio Galaxy MRC 1138-262: Evidence for Efficient Active Galactic Nucleus Feedback in the Early Universe? |url=https://ui.adsabs.harvard.edu/abs/2006ApJ...650..693N |journal=The Astrophysical Journal |volume=650 |issue=2 |pages=693–705 |doi=10.1086/507266 |arxiv=astro-ph/0606530 |bibcode=2006ApJ...650..693N |issn=0004-637X}}</ref><ref>{{Cite journal |last1=Nesvadba |first1=N. P. H. |last2=Lehnert |first2=M. D. |last3=Breuck |first3=C. De |last4=Gilbert |first4=A. |last5=Breugel |first5=W. van |date=2007-11-01 |title=Compact radio sources and jet-driven AGN feedback in the early universe: constraints from integral-field spectroscopy |url=https://www.aanda.org/articles/aa/abs/2007/43/aa8175-07/aa8175-07.html |journal=Astronomy & Astrophysics |language=en |volume=475 |issue=1 |pages=145–153 |doi=10.1051/0004-6361:20078175 |arxiv=0708.4150 |bibcode=2007A&A...475..145N |issn=0004-6361}}</ref>

The [[Atomic and molecular astrophysics|molecular gas]] is known to end up between two [[colliding galaxies]]<ref>{{Cite journal |last1=Zhu |first1=Ming |last2=Gao |first2=Yu |last3=Seaquist |first3=E. R. |last4=Dunne |first4=Loretta |date=2007-05-11 |title=Gas and Dust in the Taffy Galaxies: UGC 12914/15 |url=https://iopscience.iop.org/article/10.1086/517996 |journal=The Astronomical Journal |volume=134 |issue=1 |pages=118–134 |doi=10.1086/517996 |arxiv=astro-ph/0703200 |bibcode=2007AJ....134..118Z |issn=0004-6256}}</ref> which displays absorption line profiles like [[P Cygni]], while the [[active galactic nucleus]] host shows Lyα emission that indicative of a galaxy-wide "[[Galactic superwind|superwind]]".<ref>{{Cite journal |last1=Steidel |first1=C. C. |last2=Adelberger |first2=K. L. |last3=Shapley |first3=A. E. |last4=Pettini |first4=M. |last5=Dickinson |first5=M. |last6=Giavalisco |first6=M. |date=2000-03-20 |title=Lyman Alpha Imaging of a Proto-Cluster Region at &#61;3.09 |journal=The Astrophysical Journal |volume=532 |issue=1 |pages=170–182 |doi=10.1086/308568 |arxiv=astro-ph/9910144 |issn=0004-637X}}</ref><ref>{{Cite journal |last1=Taniguchi |first1=Yoshiaki |last2=Shioya |first2=Yasuhiro |date=2000-03-01 |title=Superwind Model of Extended Lyα Emitters at High Redshift |url=https://ui.adsabs.harvard.edu/abs/2000ApJ...532L..13T |journal=The Astrophysical Journal |volume=532 |issue=1 |pages=L13–L16 |doi=10.1086/312557 |pmid=10702121 |arxiv=astro-ph/0001522 |bibcode=2000ApJ...532L..13T |issn=0004-637X}}</ref> Moreover, the host is found to have a [[Luminous efficacy|luminous]] highly [[Ionization|ionized]] outflow. Despite showing a strong massive starburst, the ultraviolet-mid-infrared [[spectral energy distribution]] in 4C +72.26 is found to have a pre-existing [[stellar population]] that comprises ~1012 Msolar of [[stellar mass]], with further ~2 per cent contributed by the current burst. This suggests that 4C +72.26 has assembled most of its final stellar mass.<ref name=":0" />

4C +72.26 is classfied as a broad [[Spectral line|absorption-line]] radio galaxy with strong mid-infrared continua observed through [[spectrograph]] observations from [[Spitzer Space Telescope|Spitzer Telescope]],<ref>{{Cite journal |last1=Seymour |first1=N. |last2=Ogle |first2=P. |last3=De Breuck |first3=C. |last4=Fazio |first4=G. G. |last5=Galametz |first5=A. |last6=Haas |first6=M. |last7=Lacy |first7=M. |last8=Sajina |first8=A. |last9=Stern |first9=D. |last10=Willner |first10=S. P. |last11=Vernet |first11=J. |date=2008-07-01 |title=Mid-Infrared Spectra of High-Redshift (z > 2) Radio Galaxies |url=https://ui.adsabs.harvard.edu/abs/2008ApJ...681L...1S |journal=The Astrophysical Journal |volume=681 |issue=1 |pages=L1 |doi=10.1086/590081 |arxiv=0805.2143 |bibcode=2008ApJ...681L...1S |issn=0004-637X}}</ref><ref>{{Cite journal |last1=De Breuck |first1=Carlos |last2=Seymour |first2=Nick |last3=Stern |first3=Daniel |last4=Willner |first4=S. P. |last5=Eisenhardt |first5=P. R. M. |last6=Fazio |first6=G. G. |last7=Galametz |first7=Audrey |last8=Lacy |first8=Mark |last9=Rettura |first9=Alessandro |last10=Rocca-Volmerange |first10=Brigitte |last11=Vernet |first11=Joël |date=2010-11-15 |title=THE ''SPITZER'' HIGH-REDSHIFT RADIO GALAXY SURVEY |url=https://iopscience.iop.org/article/10.1088/0004-637X/725/1/36 |journal=The Astrophysical Journal |volume=725 |issue=1 |pages=36–62 |doi=10.1088/0004-637x/725/1/36 |arxiv=1010.1385 |bibcode=2010ApJ...725...36D |issn=0004-637X}}</ref> according to research conducted by Dey in 1999,<ref>{{Cite book |last1=Röttgering |first1=H. J. A. |url=https://ui.adsabs.harvard.edu/abs/1999mdrg.conf.....R |title=The Most Distant Radio Galaxies |last2=Best |first2=P. N. |last3=Lehnert |first3=M. D. |date=1999-01-01|bibcode=1999mdrg.conf.....R }}</ref> similar to those of broad absorption-line quasars with C IV trough extending bluewards to ~7000&nbsp;km s<sup>−1</sup>.<ref name=":0" />

With an upper [[spectrum]] appearing similar to the [[Long-slit spectroscopy|long-slit]] spectrum that is presented,<ref>{{Cite journal |last1=Breuck |first1=Carlos De |last2=Breugel |first2=Wil van |last3=Röttgering |first3=Huub |last4=Stern |first4=Daniel |last5=Miley |first5=George |last6=Vries |first6=Wim de |last7=Stanford |first7=S. A. |last8=Kurk |first8=Jaron |last9=Overzier |first9=Roderik |date=2001-03-01 |title=Spectroscopy of Ultra-steep-Spectrum RadioSources |url=https://iopscience.iop.org/article/10.1086/319392/meta |journal=The Astronomical Journal |language=en |volume=121 |issue=3 |pages=1241 |doi=10.1086/319392 |arxiv=astro-ph/0012065 |bibcode=2001AJ....121.1241D |issn=1538-3881}}</ref> the galaxy also have [[wavelength]] coverage up to ~8400 Å. Besides the narrow [[Spectral line|emission lines]] of [[Lyman-alpha|Lyα]] and [[Helium-3|He II]], several deep broad absorption troughs are seen, with sharper [[Absorption spectroscopy|absorption]] features shortward of the predicted wavelengths that is O I<sub>1302</sub> and C II<sub>1335</sub> similar to [[4C +41.17]]<ref>{{Cite journal |last1=Dey |first1=Arjun |last2=van Breugel |first2=Wil |last3=Vacca |first3=William D. |last4=Antonucci |first4=Robert |date=December 1997 |title=Triggered Star Formation in a Massive Galaxy at''z''= 3.8: 4C 41.17 |url=https://iopscience.iop.org/article/10.1086/304911 |journal=The Astrophysical Journal |volume=490 |issue=2 |pages=698–709 |doi=10.1086/304911 |arxiv=astro-ph/9707166 |bibcode=1997ApJ...490..698D |issn=0004-637X}}</ref> and [[NGC 1741]], a star-forming galaxy.<ref>{{Cite journal |last1=Conti |first1=Peter S. |last2=Leitherer |first2=Claus |last3=Vacca |first3=William D. |date=1996-04-01 |title=Hubble Space Telescope Ultraviolet Spectroscopy of NGC 1741: A Nearby Template for Distant Energetic Starbursts |url=https://ui.adsabs.harvard.edu/abs/1996ApJ...461L..87C |journal=The Astrophysical Journal |volume=461 |pages=L87 |doi=10.1086/310005 |arxiv=astro-ph/9602084 |bibcode=1996ApJ...461L..87C |issn=0004-637X}}</ref>

== References == <references />{{Draco (constellation)}} [[Category:Radio galaxies]] [[Category:Draco (constellation)]] [[Category:Principal Galaxies Catalogue objects]] [[Category:Interacting galaxies]] [[Category:Active galaxies]] [[Category:Starburst galaxies]] [[Category:4C objects]]