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Author(s): Kuntschner H; Emsellem E; Bacon R; Bureau M; Cappellari M; Davies RL; de Zeeuw PT; Falcon-Barroso J; Krajnovic D; McDermid RM; Peletier RF; Sarzi M
Title: The SAURON project - VI. Line strength maps of 48 elliptical and lenticular galaxies
Source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 369 (2): 497-528
Date: 2006 JUN 21
Document Type: Journal : Article
DOI:
Language: English
Comment:
Address: European So Observ, Space Telescope European Coordinating Facil, D-85748 Garching, Germany.
CRAL Observ, F-69230 St Genis Laval, France. Univ Oxford, Oxford OX1 2JD, England. Leiden Univ, NL-2300 RA Leiden, Netherlands. Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands. Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England. Reprint: Kuntschner, H, European So Observ, Space Telescope European
Coordinating Facil, Karl Schwarzschild Str 2, D-85748 Garching, Germany. E-mail: hkuntsch@eso.org
Author Keywords: galaxies : bulges; galaxies : elliptical and lenticular, cD; galaxies :
evolution; galaxies : formation; galaxies : kinematics and dynamics;
galaxies : structure
KeyWords Plus: OLD STELLAR POPULATIONS; SPATIALLY-RESOLVED SPECTROSCOPY; SIGHT
VELOCITY DISTRIBUTIONS; GLOBULAR-CLUSTERS; COMA CLUSTER; S0 GALAXIES;
ABSORPTION FEATURES; FORMATION HISTORY; LICK INDEXES; IONIZED-GAS
Abstract: We present absorption line strength maps of 48 representative elliptical and lenticular galaxies obtained as part of a survey of nearby galaxies using our custom-built integral-field spectrograph, SAURON, operating on the William Herschel Telescope. Using high-quality spectra, spatially binned to a constant signal-to-noise ratio, we measure four key age, metallicity and abundance ratio sensitive indices from the Lick/IDS system over a two-dimensional field extending up to approximately one effective radius. A discussion of calibrations and offsets is given, along with a description of error estimation and nebular emission correction. We modify the classical Fe5270 index to define a new index, Fe5270S, which maximizes the useable spatial coverage of SAURON. Maps of H beta, Fe5015, Mgb and Fe5270S are presented for each galaxy. We use the maps to compute average line strengths integrated over circular apertures of one-eighth effective radius, and compare the resulting relations of index versus velocity dispersion with previous long-slit work. The metal line strength maps show generally negative gradients with increasing radius roughly consistent with the morphology of the light profiles. Remarkable deviations from this general trend exist, particularly the Mgb isoindex contours appear to be flatter than the isophotes of the surface brightness for about 40 per cent of our galaxies without significant dust features. Generally, these galaxies exhibit significant rotation. We infer from this that the fast-rotating component features a higher metallicity and/or an increased Mg/Fe ratio as compared to the galaxy as a whole. The H beta maps are typically flat or show a mild positive outwards radial gradient, while a few galaxies show strong central peaks and/or elevated overall H beta strength likely connected to recent star formation activity. For the most prominent post-starburst galaxies, even the metal line strength maps show a reversed gradient.
Cited References: AFANASIEV VL, 2002, ASTRON J, V124, P706 BACON R, 2001, MON NOT R ASTRON SOC, V326, P23 BENDER R, 1988, ASTRON ASTROPHYS S, V74, P385 BENDER R, 1993, ASTROPHYS J, V411, P153 BENDER R, 1994, MON NOT R ASTRON SOC, V269, P785 BERNARDI M, 2003, ASTRON J, V125, P1882 BICA E, 1990, ASTRON ASTROPHYS, V228, P23 BOHLIN RC, 2001, ASTRON J, V122, P2118 BOWER GA, 2000, ASTROPHYS J 1, V534, P189 BRODIE JP, 1986, ASTROPHYS J, V300, P258 BURBIDGE EM, 1959, APJ, V130, P20 BUREAU M, 2005, ASTROPHYS J 1, V626, P159 BURSTEIN D, 1984, ASTROPHYS J, V287, P586 BURSTEIN D, 1988, ASSL, V141, P17 BUSARELLO G, 1996, ASTRON ASTROPHYS, V314, P32 CALDWELL N, 2003, ASTRON J, V125, P2891 CAPETTI A, 2000, ASTRON ASTROPHYS, V362, P871 CAPPELLARI M, 2003, MON NOT R ASTRON SOC, V342, P345 CAPPELLARI M, 2004, PUBL ASTRON SOC PAC, V116, P138 CAPPELLARI M, 2006, MON NOT R ASTRON SOC, V366, P1126 CARDIEL N, 1998, ASTRON ASTROPHYS SUP, V127, P597 CARLBERG RG, 1984, ASTROPHYS J, V286, P403 CAROLLO CM, 1993, MON NOT R ASTRON SOC, V265, P553 COLLESS M, 1999, MON NOT R ASTRON SOC, V303, P813 DAVIES RL, 1983, ASTROPHYS J, V266, P41 DAVIES RL, 1993, MON NOT R ASTRON SOC, V262, P650 DELBURGO C, 2001, MON NOT R ASTRON SOC, V321, P227 DENICOLO G, 2005, MON NOT R ASTRON SOC, V356, P1440 DEZEEUW PT, 2002, MON NOT R ASTRON SOC, V329, P513 EFSTATHIOU G, 1980, MON NOT R ASTRON SOC, V193, P931 EFSTATHIOU G, 1982, MON NOT R ASTRON SOC, V201, P975 EMSELLEM E, 1996, ASTRON ASTROPHYS, V312, P777 EMSELLEM E, 2004, MON NOT R ASTRON SOC, V352, P721 FABER SM, 1973, ASTROPHYS J, V179, P731 FALCONBARROSO J, 2004, MON NOT R ASTRON SOC, V350, P35 FALCONBARROSO J, 2006, IN PRESS MNRAS FERNANDES RC, 2004, ASTROPHYS J 1, V605, P105 FISHER D, 1996, ASTROPHYS J 1, V459, P110 GONZALEZ JJ, 1993, THESIS U CALIFORNIA GONZALEZ JJ, 1995, ASTR SOC P, V86, P225 GORGAS J, 1990, MON NOT R ASTRON SOC, V245, P217 GOUDFROOIJ P, 1994, ASTRON ASTROPHYS SUP, V105, P341 HAU GKT, 1998, THESIS U CAMBRIDGE HO LC, 1997, ASTROPHYS J SUPPL S, V112, P315 JONES LA, 1997, THESIS U N CAROLINA JORGENSEN I, 1995, MON NOT R ASTRON SOC, V276, P1341 JORGENSEN I, 1999, MON NOT R ASTRON SOC, V306, P607 KING DL, 1985, 31 RGO KOBAYASHI C, 1999, ASTROPHYS J 1, V527, P573 KORN AJ, 2005, ASTRON ASTROPHYS, V438, P685 KUNTSCHNER H, 2000, MON NOT R ASTRON SOC, V315, P184 KUNTSCHNER H, 2001, MON NOT R ASTRON SOC, V323, P615 KUNTSCHNER H, 2004, ASTRON ASTROPHYS, V426, P737 MCDERMID R, 2004, ASTRON NACHR, V325, P100 MCDERMID RM, 2005, UNPUB MNRAS MEHLERT D, 2000, ASTRON ASTROPHYS SUP, V141, P449 MEHLERT D, 2003, ASTRON ASTROPHYS, V407, P423 MICHARD R, 1988, ASTRON ASTROPHYS S, V74, P25 MICHARD R, 1999, ASTRON ASTROPHYS SUP, V137, P245 MORELLI L, 2004, MON NOT R ASTRON SOC, V354, P753 NORRIS MA, 2006, MON NOT R ASTRON SOC, V367, P815 PELETIER RF, 1990, ASTRON J, V100, P1091 PELETIER RF, 1993, ASTRON J, V105, P1378 PELETIER RF, 1999, MON NOT R ASTRON SOC, V310, P703 PELETIER RF, 1999, MON NOT R ASTRON SOC, V310, P863 PENG CY, 2002, ASTRON J, V124, P266 PROCTOR RN, 2002, MON NOT R ASTRON SOC, V333, P517 QUILLEN AC, 2000, ASTROPHYS J SUPPL S, V128, P85 RAMPAZZO R, 2005, ASTRON ASTROPHYS, V433, P497 RIX HW, 1992, APJ, V400, PL5 ROSE JA, 1985, ASTRON J, V90, P1927 SANCHEZBLAZQUEZ P, 2004, THESIS U COMPLUTENSE SARZI M, 2001, ASTROPHYS J 1, V550, P65 SARZI M, 2006, MON NOT R ASTRON SOC, V366, P1151 SILCHENKO OK, 2002, ASTROPHYS J 1, V577, P668 SILCHENKO OK, 2003, ASTROPHYS J 1, V591, P185 SILCHENKO OK, 2005, ASTRON LETT+, V31, P227 TERLEVICH R, 1981, MON NOT R ASTRON SOC, V196, P381 THOMAS D, 2003, MON NOT R ASTRON SOC, V339, P897 THOMAS D, 2005, ASTROPHYS J 1, V621, P673 TRAGER SC, 1998, ASTROPHYS J SUPPL S, V116, P1 TRAGER SC, 2000, ASTRON J, V119, P1645 TURNBULL AJ, 1999, MON NOT R ASTRON SOC, V307, P967 VANDENBOSCH FC, 1998, MON NOT R ASTRON SOC, V298, P267 VAZDEKIS A, 1999, ASTROPHYS J 1, V513, P224 WAGNER SJ, 1988, ASTRON ASTROPHYS, V195, PL5 WERNLI F, 2002, ASTRON ASTROPHYS, V396, P73 WHITE SDM, 1980, MNRAS, V191, P1 WORTHEY G, 1992, ASTROPHYS J, V398, P69 WORTHEY G, 1994, APJS, V95, P107 WORTHEY G, 1994, ASTROPHYS J SUPPL S, V94, P687 WORTHEY G, 1997, ASTROPHYS J SUPPL S, V111, P377 WORTHEY G, 2003, ASTROPHYS J 1, V586, P17 |