{"id":5827,"date":"2018-02-15T00:00:00","date_gmt":"2018-02-14T23:00:00","guid":{"rendered":"https:\/\/www.ieec.cat\/el-creixement-dels-forats-negres-deixa-enrere-el-de-les-gal%c3%a0xies-not-translated\/"},"modified":"2022-12-22T23:24:44","modified_gmt":"2022-12-22T22:24:44","slug":"el-creixement-dels-forats-negres-deixa-enrere-el-de-les-gal%c3%a0xies-not-translated","status":"publish","type":"post","link":"https:\/\/www.ieec.cat\/en\/el-creixement-dels-forats-negres-deixa-enrere-el-de-les-gal%c3%a0xies-not-translated\/","title":{"rendered":"El creixement dels forats negres deixa enrere el de les gal\u00e0xies [NOT TRANSLATED]"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; fullwidth=&#8221;on&#8221; theme_builder_area=&#8221;post_content&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; height=&#8221;114px&#8221; background_color=&#8221;&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; title_text=&#8221;&#8221; background_image=&#8221;\/wp-content\/uploads\/2022\/04\/slider-corpo2.jpg&#8221;][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; theme_builder_area=&#8221;post_content&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||0px||false|false&#8221; custom_margin=&#8221;||0px||false|false&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;][et_pb_row _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; type=&#8221;4_4&#8243; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; _dynamic_attributes=&#8221;content&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF90aXRsZSIsInNldHRpbmdzIjp7ImJlZm9yZSI6IjxoMSBjbGFzcz1cImVudHJ5X3RpdGxlXCI+IiwiYWZ0ZXIiOiI8L2gxPiJ9fQ==@[\/et_pb_text][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; _dynamic_attributes=&#8221;content&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9kYXRlIiwic2V0dGluZ3MiOnsiYmVmb3JlIjoiIiwiYWZ0ZXIiOiIiLCJkYXRlX2Zvcm1hdCI6ImN1c3RvbSIsImN1c3RvbV9kYXRlX2Zvcm1hdCI6IlktbS1kIEg6aTpzIn19@[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;0px||||false|false&#8221; custom_padding=&#8221;0px||||false|false&#8221; top_divider_color=&#8221;RGBA(255,255,255,0)&#8221; top_divider_height=&#8221;0px&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_row column_structure=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.ieec.cat\/wp-content\/uploads\/2022\/12\/1543421865_c4d7b980b726a46b5bf7a235a4674a05_galaxy1.jpg&#8221; alt=&#8221;El creixement dels forats negres deixa enrere el de les gal\u00e0xies [NOT TRANSLATED]&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;PR_Image1.png&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; width=&#8221;600px&#8221; module_alignment=&#8221;center&#8221;][\/et_pb_image][et_pb_text _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;]Dos nous estudis que utilitzen dades obtingudes amb l\u2019observatori de raigs X Chandra i altres telescopis de la NASA evidencien que el creixement dels forats negres m\u00e9s grans de l\u2019Univers est\u00e0 superant la taxa de formaci\u00f3 d\u2019estrelles en les gal\u00e0xies en les quals estan situats.<\/p>\n<p>Durant molts anys, els astr\u00f2noms han recollit dades sobre la formaci\u00f3 d\u2019estrelles a les gal\u00e0xies i el creixement dels forats negres supermassius (\u00e9s a dir, aquells amb milions o milers de milions de vegades la massa del Sol) situats en els seus centres. Aquestes dades suggereixen que els forats negres i les estrelles de les seves gal\u00e0xies amfitriones creixen junts.<\/p>\n<p>Ara, els resultats de dos grups d\u2019investigadors independents indiquen que els forats negres de les gal\u00e0xies massives han crescut molt m\u00e9s r\u00e0pidament que en les menys massives.<\/p>\n<p>\u201cEstem intentant reconstruir una carrera que va comen\u00e7ar fa milers de milions d\u2019anys\u201d, va dir Guang Yang de Penn State University que va dirigir un dels dos estudis. \u201cEstem utilitzant dades extraordin\u00e0ries preses amb diferents telescopis per esbrinar com es va desenvolupar aquesta competici\u00f3 c\u00f2smica\u201d.<\/p>\n<p>Utilitzant grans quantitats de dades de l\u2019observatori de raigs X Chandra de la NASA, el Telescopi Espacial Hubble i altres observatoris, Yang i els seus col\u00b7laboradors han estudiat la taxa de creixement dels forats negres de les gal\u00e0xies a dist\u00e0ncies entre 4.300 y 12.200 milions d\u2019anys llum de la Terra. Les dades de raigs X inclo\u00efen les publicades a Chandra Deep Field-South &amp; North i a COSMOS-Legacy.<\/p>\n<p>Els cient\u00edfics van calcular la relaci\u00f3 entre la taxa de creixement d\u2019un forat negre supermassiu i la taxa de creixement de les estrelles a la seva gal\u00e0xia amfitriona. Una idea comuna \u00e9s que aquesta relaci\u00f3 \u00e9s aproximadament constant per a totes les gal\u00e0xies.<\/p>\n<p>En canvi, Yang i els seus col\u00b7laboradors van trobar que aquesta proporci\u00f3 \u00e9s molt m\u00e9s gran per a les gal\u00e0xies m\u00e9s massives. Per a les gal\u00e0xies que contenen aproximadament 100 mil milions de masses solars d\u2019estels, la proporci\u00f3 \u00e9s aproximadament deu vegades superior a la de les gal\u00e0xies que contenen aproximadament 10 mil milions de masses solars d\u2019estrelles.<\/p>\n<p>\u201cUna pregunta \u00f2bvia \u00e9s per qu\u00e8?\u201d, diu el co-autor Niel Brandt, tamb\u00e9 del Penn State University. \u201cPotser les gal\u00e0xies massives s\u00f3n m\u00e9s efectives a l\u2019hora d\u2019alimentar de gas fred els seus forats negres supermassius centrals que les menys massives\u201d.<\/p>\n<p>Un altre grup de cient\u00edfics va trobar de forma independent que el creixement dels forats negres m\u00e9s massius ha superat el de les estrelles en les seves gal\u00e0xies amfitriones. Mar Mezcua, de l\u2019Institut de Ci\u00e8ncies de l\u2019Espai (ICE, CSIC) i l\u2019Institut d\u2019Estudis Espacials de Catalunya (IEEC), i els seus col\u00b7laboradors van estudiar forats negres en algunes de les gal\u00e0xies m\u00e9s brillants i massives de l\u2019Univers. Van estudiar 72 gal\u00e0xies situades al centre de c\u00famuls de gal\u00e0xies situats a dist\u00e0ncies al voltant de 3.500 milions d\u2019anys llum de la Terra. L\u2019estudi va utilitzar dades de raigs X procedents de Chandra i dades en les longituds d\u2019ona de r\u00e0dio de l\u2019Australia Telescope Compact Array, del Karl G. Jansky Very Large Array i del Very Long Baseline Array d\u2019Estats Units.<\/p>\n<p>Mar Mezcua i els seus col\u00b7laboradors van estimar les masses dels forats negres d\u2019aquests c\u00famuls de gal\u00e0xies utilitzant una coneguda relaci\u00f3 entre la massa d\u2019un forat negre i l\u2019emissi\u00f3 de r\u00e0dio i raigs X associada a ell. Van trobar que les masses dels forats negres eren deu vegades m\u00e9s grans que les estimades per un altre m\u00e8tode que assumia que els forats negres i les seves gal\u00e0xies creixien en t\u00e0ndem.<\/p>\n<p>\u201cHem trobat forats negres que s\u00f3n molt m\u00e9s grans del que esper\u00e0vem\u201d, va dir Mar Mezcua. \u201cPotser van comen\u00e7ar abans aquesta cursa per cr\u00e9ixer o, potser, han tingut un avantatge en la velocitat de creixement que ha durat milers de milions d\u2019anys\u201d.<\/p>\n<p>Els investigadors van trobar que gaireb\u00e9 la meitat dels forats negres de la seva mostra tenien unes masses de com a m\u00ednim 10 mil milions de vegades la massa del Sol. Aix\u00f2 els situa en una categoria de massa extrema que alguns astr\u00f2noms anomenen forats negres \u201cultramassius\u201d.<\/p>\n<p>\u201cSabem que els forats negres s\u00f3n objectes extrems\u201d, diu la coautora Julie Hlavacek-Larrondo de la Universitat de Montreal, \u201cper la qual cosa potser no sorprengui que els exemples m\u00e9s extrems trenquin les regles que pens\u00e0vem que haurien de seguir\u201d.<\/p>\n<p>El treball de Mar Mezcua i col\u00b7laboradors va ser publicat per la revista Monthly Notices of the Royal Astronomical Society (MNRAS) aquest febrer i est\u00e0 disponible en l\u00ednia (<a href=\"https:\/\/arxiv.org\/abs\/1710.10268\" rel=\"nofollow\">https:\/\/arxiv.org\/abs\/1710.10268<\/a>). El document de Yang et al. ha estat acceptat i apareixer\u00e0 publicat en el n\u00famero d\u2019abril d\u2019aquest anyde la mateixa revista (tamb\u00e9 disponible en l\u00ednia: <a href=\"https:\/\/arxiv.org\/abs\/1710.09399\" rel=\"nofollow\">https:\/\/arxiv.org\/abs\/1710.09399<\/a>).<\/p>\n<p>El Centre de Vol Espacial Marshall de la NASA a Huntsville, Alabama, gestiona el programa Chandra per a la Direcci\u00f3 de la Missi\u00f3 de Ci\u00e8ncia de la NASA a Washington. El Smithsonian Astrophysical Observatory de Cambridge, Massachusetts, controla les operacions de ci\u00e8ncia i vol de Chandra. [NOT TRANSLATED][\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8221; _builder_version=&#8221;4.14.8&#8243; _module_preset=&#8221;default&#8221; title_text=&#8221;PR_Image1.png&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243; width=&#8221;600px&#8221; module_alignment=&#8221;center&#8221;]Dos nous estudis que utilitzen dades obtingudes amb l\u2019observatori de raigs X Chandra i altres telescopis de la NASA evidencien que el creixement dels forats negres m\u00e9s grans de l\u2019Univers est\u00e0 superant la taxa de formaci\u00f3 d\u2019estrelles en les gal\u00e0xies en les quals estan situats.Durant molts anys, els [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":5823,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[71,76],"tags":[],"class_list":["post-5827","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-announcements","category-other-announcements"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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