Integral field spectroscopy of 23 spiral bulges

被引:25
作者
Batcheldor, D [1 ]
Axon, D
Merritt, D
Hughes, MA
Marconi, A
Binney, J
Capetti, A
Merrifield, M
Scarlata, C
Sparks, W
机构
[1] Univ Hertfordshire, STRI, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England
[2] Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA
[3] INAF, Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
[4] Univ Oxford, Oxford OX1 3NP, England
[5] INAF, Osservatorio Astron Torino, I-10025 Pino Torinese, Italy
[6] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England
[7] ETH, Honggerberg HPF G4 3, CH-8092 Zurich, Switzerland
[8] Space Telescope Sci Inst, Baltimore, MD 21218 USA
关键词
galaxies : kinematics and dynamics; galaxies : spiral; stellar dynamics; techniques : spectroscopic;
D O I
10.1086/431483
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have obtained integral-field spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first two-dimensional survey directed solely at the bulges of spiral galaxies. Eleven galaxies of the sample do not have previous measurements of the stellar velocity dispersion (sigma(*)). These data are designed to complement our Space Telescope Imaging Spectrograph program for estimating black hole masses in the range 10(6)-10(8) M-circle dot using gas kinematics from nucleated disks. These observations will serve to derive the stellar dynamical bulge properties using the traditional Mg b and Ca II triplets. We use both cross-correlation and maximum penalized likelihood to determine projected sigma(*) in these systems and present radial velocity fields, major axis rotation curves, curves of growth, and sigma(*) fields. Using cross-correlation to extract the low-order two-dimensional stellar dynamics we generally see coherent radial rotation and irregular velocity dispersion fields suggesting that sigma(*) is a nontrivial parameter to estimate.
引用
收藏
页码:76 / 86
页数:11
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