首页 | 本学科首页   官方微博 | 高级检索  
     


The dwarf galaxy population of the Coma cluster to MR=−11: a detailed description
Authors:Neil Trentham
Affiliation:Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu HI 96822, USA
Abstract:We present the luminosity function and measurements of the scalelengths, colours and radial distribution of dwarf galaxies in the Coma cluster down to R =24. Our survey area is 674 arcmin2; this is the deepest and most detailed survey covering such a large area.
Our measurements agree with those of most previous authors at bright and intermediate magnitudes. The new results are as follows.
(1) Galaxies in the Coma cluster have a luminosity function φ( L )∝ L α that is steep (α∼−1.7) for −15< MR <−11, and is shallower brighter than this. The curvature in the luminosity function at MR ∼−15 is statistically significant.
(2) The galaxies that contribute most strongly to the luminosity function at −14< MR <−12 have colours and scalelengths that are consistent with those of local dwarf spheroidal galaxies placed at the distance of Coma.
(3) These galaxies with −14< MR <−12 have a colour distribution that is very strongly peaked at B − R =1.3. This is suggestive of a substantial degree of homogeneity in their star formation histories and metallicities.
(4) These galaxies with −14< MR <−12 also appear to be more confined to the cluster core ( r ∼200 kpc) than the brighter galaxies. Alternatively, this observation may be explained in part or whole by the presence of an anomalously high number of background galaxies behind the cluster core. Velocity measurements of these galaxies would distinguish between these two possibilities.
Keywords:galaxies: clusters: individual: Coma    galaxies: luminosity function, mass function.
相似文献(共20条):
[1]、Neil Trentham,Leda Sampson, Manda Banerji.The galaxy luminosity function from MR=−25 to MR=−9[J].Monthly notices of the Royal Astronomical Society,2005,357(2):783-792.
[2]、Neil Trentham,R. Brent Tully,Marc A. W. Verheijen.The Ursa Major cluster of galaxies – III. Optical observations of dwarf galaxies and the luminosity function down to MR=−11[J].Monthly notices of the Royal Astronomical Society,2001,325(1):385-404.
[3]、S. Sabatini,J. Davies,R. Scaramella,R. Smith,M. Baes,†,S. M. Linder,S. Roberts, V. Testa.The dwarf LSB galaxy population of the Virgo cluster – I. The faint-end slope of the luminosity function[J].Monthly notices of the Royal Astronomical Society,2003,341(3):981-992.
[4]、Montegriffo,Bellazzini,Ferraro,Martins,Sarajedini,& Fusi Pecci.The globular cluster system of the Sagittarius dwarf spheroidal galaxy: the age of Terzan 8[J].Monthly notices of the Royal Astronomical Society,1998,294(2):315-326.
[5]、Albert A. Zijlstra,K. Gesicki,J. R. Walsh,D. Péquignot,P. A. M. van Hoof, D. Minniti.The planetary nebula population of the Sagittarius dwarf spheroidal galaxy[J].Monthly notices of the Royal Astronomical Society,2006,369(2):875-890.
[6]、S. Toft,G. Soucail, J. Hjorth.The galaxy population of the z= 1 cluster of galaxies MG2016+112[J].Monthly notices of the Royal Astronomical Society,2003,344(2):337-346.
[7]、Volker Springel, Glennys R. Farrar.The speed of the \'bullet\' in the merging galaxy cluster 1E0657−56[J].Monthly notices of the Royal Astronomical Society,2007,380(3):911-925.
[8]、M. R. George †,A. C. Fabian,J. S. Sanders,A. J. Young, H. R. Russell.X-ray observations of the galaxy cluster PKS 0745−191: to the virial radius, and beyond[J].Monthly notices of the Royal Astronomical Society,2009,395(2):657-666.
[9]、M. N. Bremer,I. Valtchanov,J. Willis,B. Altieri,S. Andreon,P. A. Duc,F. Fang,C. Jean,C. Lonsdale,F. Pacaud,M. Pierre,D. L. Shupe,J. A. Surace,I. Waddington.XMM-LSS discovery of a  z= 1.22  galaxy cluster[J].Monthly notices of the Royal Astronomical Society,2006,371(3):1427-1434.
[10]、Ewa L. &#;okas, Gary A. Mamon.Dark matter distribution in the Coma cluster from galaxy kinematics: breaking the mass–anisotropy degeneracy[J].Monthly notices of the Royal Astronomical Society,2003,343(2):401-412.
[11]、J. Liske,D. J. Lemon,S. P. Driver,N. J. G. Cross, W. J. Couch.The Millennium Galaxy Catalogue:  16 ≤BMGC < 24  galaxy counts and the calibration of the local galaxy luminosity function[J].Monthly notices of the Royal Astronomical Society,2003,344(1):307-324.
[12]、Piotr Flin.The anisotropy of galaxy orientation in the Coma/A1367 supercluster[J].Monthly notices of the Royal Astronomical Society,2001,325(1):49-54.
[13]、J. Rasmussen, T. J. Ponman.XMM–Newton observations of two X-ray-bright galaxy groups – pushing out to r500[J].Monthly notices of the Royal Astronomical Society,2004,349(2):722-734.
[14]、Matthew T. Whiting,Rachel L. Webster, Paul J. Francis.Multi-object spectroscopy of the field surrounding PKS 2126−158: discovery of a z= 0.66 galaxy group[J].Monthly notices of the Royal Astronomical Society,2006,368(1):341-350.
[15]、Stella Seitz,R. P. Saglia,Ralf Bender,Ulrich Hopp,Paola Belloni,& Bodo Ziegler.The z=2.72 galaxy cB58: a gravitational fold arc lensed by the cluster MS 1512+36[J].Monthly notices of the Royal Astronomical Society,1998,298(4):945-965.
[16]、J.-M. Petit †,M. J. Holman †,B. J. Gladman †‡,J. J. Kavelaars †,H. Scholl, T. J. Loredo.The Kuiper Belt luminosity function from mR= 22 to 25[J].Monthly notices of the Royal Astronomical Society,2006,365(2):429-438.
[17]、Patrick Petitjean,R. Srianand,Cédric Ledoux.Molecular hydrogen at  zabs=1.973  toward Q 0013−004: dust depletion pattern in damped Lyman α systems[J].Monthly notices of the Royal Astronomical Society,2002,332(2):383-391.
[18]、D. Harsono, R. De Propris.The cluster galaxy luminosity function at z= 0.3: a recent origin for the faint-end upturn?[J].Monthly notices of the Royal Astronomical Society,2007,380(3):1036-1040.
[19]、A. M. Cody,D. Carter,T. J. Bridges,B. Mobasher †, B. M. Poggianti.Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane[J].Monthly notices of the Royal Astronomical Society,2009,396(3):1647-1658.
[20]、S. W. Allen,R. W. Schmidt, A. C. Fabian.Chandra observations of RX J1347.5−1145: the distribution of mass in the most X-ray-luminous galaxy cluster known[J].Monthly notices of the Royal Astronomical Society,2002,335(2):256-266.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号