| 词条 | Messier 105 |
| 释义 |
| name = Messier 105 | image = The heart of the Lion Messier 105.jpg | image_size = 300px | caption = M105, as viewed by the HST; Credit: NASA/ESA | epoch = J2000 | ra = {{RA|10|47|49.600}}[1] | dec = {{DEC|+12|34|53.87}}[1] | group_cluster = Leo I Group[3] | constellation name = Leo | z = | h_radial_v = {{Val|908|u=km/s}}[4] | dist_ly = {{Convert|11.22|Mpc|Mly|order=flip|abbr=on|lk=on}}[4] | type = E1[6] | appmag_v = 10.2[7] | size_v = {{nowrap|5′.4 × 4′.8}}[7] | notes = | names = M105, NGC 3379, PGC 32256, UGC 5902 }}Messier 105 or M105, also known as NGC 3379, is an elliptical galaxy located 36.6[4] million light years away in the equatorial constellation of Leo. It was discovered by Pierre Méchain on 24 March 1781, just a few days after he discovered the nearby galaxies Messier 95 and Messier 96.[11] This galaxy is one of several that were not originally included in the original Messier Catalogue compiled by Charles Messier. Messier 105 was included in the catalog only when Helen S. Hogg found a letter by Méchain describing Messier 105 and when the object described by Méchain was identified as a galaxy previously named NGC 3379.[11] This galaxy has a morphological classification of E1,[6] indicating a standard elliptical galaxy with a flattening of 10%. The major axis is aligned along a position angle of 71°. Isophotes of the galaxy are near perfect ellipses, twisting no more than 5° out of alignment, with changes in ellipticity of no more than 0.06. There is no fine structure apparent in the isophotes, such as ripples.[14] Observation of giant stars in the halo indicate there are two general populations: a dominant metal-rich subpopulation and a weaker metal-poor group.[3] Messier 105 is known to have a supermassive black hole at its core whose mass is estimated to be between {{Val|1.4|e=8}} and {{Val|2|e=8|ul=solar mass}}.[16] The galaxy has a weak active galactic nucleus of the LINER type with a spectral class of L2/T2, meaning no broad Hα line and intermediate emission line ratios between a LINER and a H II region.[17] The galaxy also contains a few young stars and stellar clusters, suggesting some elliptical galaxies still form new stars, but very slowly.[18] This galaxy, along with its companion the barred lenticular galaxy NGC 3384, is surrounded by an enormous ring of neutral hydrogen with a radius of {{Convert|200|kpc|kly|abbr=off}} and a mass of {{Val|1.8|e=9|ul=solar mass}} where star formation has been detected.[19] Messier 105 is one of several galaxies within the M96 Group (also known as the Leo I Group), a group of galaxies in the constellation Leo. The group also includes the Messier objects M95 and M96.[20][21][22][23] References1. ^1 2 {{cite web | title=NASA/IPAC Extragalactic Database | work=Results for M105 | url=http://nedwww.ipac.caltech.edu/ | accessdate=2006-11-16 }} [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]2. ^1 {{cite journal | title=Spectral Energy Distributions of Weak Active Galactic Nuclei Associated with Low-Ionization Nuclear Emission Regions | last1=Eracleous | first1=Michael | last2=Hwang | first2=Jason A. | last3=Flohic | first3=Hélène M. L. G. | display-authors=1 | journal=The Astrophysical Journal Supplement | volume=187 | issue=1 | pages=135–148 | date=March 2010 | doi=10.1088/0067-0049/187/1/135 | bibcode=2010ApJS..187..135E | arxiv=1001.2924 }} 3. ^1 {{citation | title=The intrinsic shape of NGC 3379 | last1=Statler | first1=Thomas S. | journal=The Astronomical Journal | volume=108 | issue=1 | pages=111–127 | date=July 1994 | doi=10.1086/117050 | bibcode=1994AJ....108..111S }} 4. ^1 2 {{cite journal | title=Dual Stellar Halos in the Standard Elliptical Galaxy M105 and Formation of Massive Early-type Galaxies | last1=Lee | first1=Myung Gyoon | last2=Jang | first2=In Sung | journal=The Astrophysical Journal | volume=822 | issue=2 | id=70 | pages=17 | date=May 2016 | doi=10.3847/0004-637X/822/2/70 | bibcode=2016ApJ...822...70L | arxiv=1601.06798 }} 5. ^1 2 {{citation | last1=Tian | first1=Yong | last2=Ko | first2=Chung-Ming | title=Dynamics of elliptical galaxies with planetary nebulae in modified Newtonian dynamics | journal=Monthly Notices of the Royal Astronomical Society | volume=462 | issue=1 | pages=1092–1100 | date=October 2016 | doi=10.1093/mnras/stw1697 | bibcode=2016MNRAS.462.1092T | arxiv=1606.06815 }} 6. ^1 2 3 {{citation | last1=Tully | first1=R. 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G. | last1=Jones | date=1991 | edition=2nd | title=Messier's Nebulae and Star Clusters | publisher=Cambridge University Press | isbn=978-0-521-37079-0 }} 9. ^1 {{cite journal | last1=Shapiro | first1=Kristen L. | last2=Cappellari | first2=Michele | last3=de Zeeuw | first3=Tim | last4=McDermid | first4=Richard M. | last5=Gebhardt | first5=Karl | last6=van den Bosch | first6=Remco C. E. | last7=Statler | first7=Thomas S. | display-authors=1 | title=The black hole in NGC 3379: a comparison of gas and stellar dynamical mass measurements with HST and integral-field data | journal=Monthly Notices of the Royal Astronomical Society | volume=370 | issue=2 | pages=559–579 | date=2006 | bibcode=2006MNRAS.370..559S | arxiv=astro-ph/0605479 | doi=10.1111/j.1365-2966.2006.10537.x }} 10. ^1 {{cite journal | last1=Ford | first1=Alyson | last2=Bregman | first2=J. 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II – Determination of nearby groups | journal=Astronomy and Astrophysics Supplement | volume=100 | pages=47–90 | date=1993 | bibcode=1993A&AS..100...47G }} 14. ^1 {{cite journal | first1=G. | last1=Giuricin | first2=C. | last2=Marinoni | first3=L. | last3=Ceriani | first4=A. | last4=Pisani | title=Nearby Optical Galaxies: Selection of the Sample and Identification of Groups | display-authors=1 | journal=Astrophysical Journal | volume=543 | issue=1 | pages=178–194 | date=2000 | bibcode=2000ApJ...543..178G | doi=10.1086/317070 | arxiv=astro-ph/0001140 }} 15. ^1 {{cite journal | last1=Thilker | first1=David A. | last2=Donovan | first2=Jennifer | last3=Schiminovich | first3=David | last4=Bianchi | first4=Luciana | last5=Boissier | first5=Samuel | last6=Gil de Paz | first6=Armando | last7=Madore | first7=Barry F. | last8=Martin | first8=D. Christopher | last9=Seibert | first9=Mark | display-authors=1 | title=Massive star formation within the Leo 'primordial' ring | journal=Nature | volume=457 | issue=7232 | pages=990–993 | date=2009 | bibcode=2009Natur.457..990T | doi=10.1038/nature07780 | pmid=19225520 }} }} External links
9 : Elliptical galaxies|M96 Group|Leo (constellation)|Messier objects|NGC objects|UGC objects|Principal Galaxies Catalogue objects|Astronomical objects discovered in 1781|Discoveries by Pierre Méchain |
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