Perseus Cluster 2683414 214853902 2008-05-25T16:13:35Z Xioxox 5090314 make link to radio bubbles {{Galaxy cluster | name = Perseus Cluster | image = [[Image:NGC 1275 I GRB HST2003.jpg|200px]] | caption = [[NGC 1275]] | constellation = [[Perseus_(constellation)|Perseus]] | epoch=[[J2000]] | ra={{RA|03h|18}}<ref name="ned">{{cite web | title=NASA/IPAC Extragalactic Database | work=Results for Perseus Cluster | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-28}}</ref> | dec={{DEC|+41|30}}<ref name="ned" /> | dist_ly = 150.0 [[Mly]] | appmag_v = 13.0 | size_v = 125.9&prime; | member_no = 190<ref name="ned" /> | brightest_member = [[NGC 1275]] | other_names = Abell 426,<ref name="ned" /> NGC 1275 Cluster,<ref name="ned" /> }} The '''Perseus Cluster''' (Abell 426) is a cluster of galaxies in the constellation [[Perseus_(constellation)|Perseus]]. It has a red shift of 5,366 [[kilometer|km]]/[[second|s]] and a diameter of 863&prime;.<ref name="ned" /> The galaxy cluster is the brightest cluster in the sky when observed in the X-ray band<ref>Edge A.C., Stewart G.C., Fabian A.C., [http://articles.adsabs.harvard.edu/full/1992MNRAS.258..177E Properties of cooling flows in a flux limited sample of clusters of galaxies], 1992, [[MNRAS]], 258, 177</ref>. The cluster contains the radio source [[3C 84]] which is currently blowing bubbles of relativistic plasma into the core of the cluster. These are seen as holes in an X-ray image of the cluster, as they push away the X-ray emitting gas. They are known as [[radio bubble|radio bubbles]], because they appear as emitters of radio waves due to the relativistic particles in the bubble. The galaxy [[NGC 1275]] is located at the centre of the cluster, where the X-ray emission is brightest. In [[2003]], [[astronomers]] detected the deepest [[note]] ever generated in the [[cosmos]], a [[A♯ (musical note)|B{{music|flat}}]], after 53 hours of [[Chandra X-ray Observatory|Chandra]] observations<ref>Fabian A.C., et al., [http://adsabs.harvard.edu/abs/2003MNRAS.344L..43F A Deep Chandra observation of the Perseus cluster: shocks and ripples], 2003, [[MNRAS]], 344, L43</ref>. No human will actually hear the note, because it is 57 [[octaves]] below the keys in the middle of a piano. The sound waves appear to be generated by the inflation of bubbles of relativistic plasma by the central [[active galactic nucleus]] in [[NGC 1275]]. The are visible as ripples in the [[X-ray]] band using [[Chandra X-ray Observatory]], as the X-ray brightness of the [[intracluster medium]] which fills the cluster is strongly dependent on the density of the plasma. ==External links== * {{WikiSky|z=9}} * [http://antwrp.gsfc.nasa.gov/apod/ap051208.html Astronomy picture of the day (APOD) talking about sound waves in Perseus], [http://antwrp.gsfc.nasa.gov/apod/ap030912.html earlier APOD] * Fabian, A.C., et al. [http://arxiv.org/abs/astro-ph/0306036 A deep Chandra observation of the Perseus cluster: shocks and ripples]. Monthly Notices of the Royal Astronomical Society. Vol. 344 (2003): L43 (arXiv:astro-ph/0306036v2). ==References== * [http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1999A%26AS..139..141B&db_key=AST The galaxy cluster Abell 426 (Perseus). A catalogue of 660 galaxy positions, isophotal magnitudes and morphological types], Brunzendorf, J.; Meusinger, H., Astronomy and Astrophysics Supplement, v.139, p.141-161, 1999. * [http://www.space.com/scienceastronomy/blackhole_note_030909.html Space.com article about "Sound of a Black Hole." in the Perseus Cluster] * [http://aida.astroinfo.org/displayimage.php?album=8&pos=12 http://aida.astroinfo.org/] <references /> [[Category:Galaxy clusters]] [[Category:Perseus Cluster|*]] [[Category:Perseus constellation]] [[Category:Abell objects|426]] [[sk:Kopa galaxií Perzeus]] {{galaxy-stub}}