The fornax spectroscopic survey: The number of unresolved compact galaxies

被引:28
作者
Drinkwater, MJ [1 ]
Phillipps, S
Gregg, MD
Parker, QA
Smith, RM
Davies, JI
Jones, JB
Sadler, EM
机构
[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
[2] Univ Bristol, Dept Phys, Bristol BS8 1TL, Avon, England
[3] Univ Calif Davis, Livermore, CA 94550 USA
[4] Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA
[5] Anglo Australian Observ, Epping, NSW 2121, Australia
[6] Univ Wales Coll Cardiff, Dept Phys & Astron, Cardiff CF2 3YB, S Glam, Wales
[7] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
基金
美国国家科学基金会;
关键词
galaxies : compact; galaxies : general; galaxies : starburst;
D O I
10.1086/311844
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe a sample of 13 bright (18.5 < B-J < 20.1), compact galaxies at low redshift (0.05 < z < 0.21) behind the Fornax Cluster. These galaxies are unresolved on UK Schmidt sky survey plates, and so they would be missing from most galaxy catalogs compiled from this material. The objects were found during initial observations of The Fornax Spectroscopic Survey. This project is using the Two-degree Field spectrograph on the Anglo-Australian Telescope to obtain spectra for a complete sample of all 14,000 objects, stellar and nonstellar, with 16.5 < B-J < 19.7, in a 12 deg(2) area centered on the Fornax Cluster of galaxies. The surface density of compact galaxies with magnitudes 16.5 < B-J < 19.7 is 7 +/- 3 deg(-2), representing 2.8% +/- 1.6% of all local (z < 0.2) galaxies to this limit. There are 12 +/- 3 deg(-2) with 16.5 < B-J < 20.2. They are luminous (-21.5 < M-B < -18.0, for H-o = 50 km s(-1) Mpc(-1)), and most have strong emission lines (H alpha equivalent widths of 40-200 Angstrom) and small sizes typical of luminous H II galaxies and compact narrow emission line galaxies. Four out of 13 have red colors and early-type spectra, and so they are unlikely to have been detected in any previous surveys.
引用
收藏
页码:L97 / L100
页数:4
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