GALAXY SELECTION AND THE SURFACE BRIGHTNESS DISTRIBUTION

被引:102
作者
MCGAUGH, SS
BOTHUN, GD
SCHOMBERT, JM
机构
[1] UNIV OREGON,DEPT PHYS,EUGENE,OR 97403
[2] CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125
关键词
D O I
10.1086/117543
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Optical surveys for galaxies are biased against the inclusion of low surface brightness (LSB) galaxies. Disney [Nature, 263, 573 (1976)] suggested that the constancy of disk central surface brightness noticed by Freeman [ApJ, 160, 811 (1970)] was not a physical result, but instead was an artifact of sample selection. Since LSB galaxies do exist, the pertinent and still controversial issue is if these newly discovered galaxies constitute a significant percentage of the general galaxy population. In this paper, we address this issue by determining the space density of galaxies as a function of disk central surface brightness. Using the physically reasonable assumption (which is motivated by the data) that central surface brightness is independent of disk scale length, we arrive at a distribution which is roughly flat (i.e., approximately equal numbers of galaxies at each surface brightness) faintwards of the Freeman (1970) value. Brightwards of this, we fmd a sharp decline in the distribution which is analogous to the turn down in the luminosity function at L*. An intrinsically sharply peaked ''Freeman law'' distribution can be completely ruled out, and no Gaussian distribution can fit the data. Low surface brightness galaxies (those with central surface brightness fainter than 22 B mag arcsec(-2)) comprise greater than or similar to 1/2 the general galaxy population, so a representative sample of galaxies at z=0 does not really exist at present since past surveys have been insensitive to this component of the general galaxy population. (C) 1995 American Astronomical Society.
引用
收藏
页码:573 / 580
页数:8
相关论文
共 39 条
[1]   EXTRAPOLATED CENTRAL SURFACE BRIGHTNESSES OF GALAXIES [J].
ALLEN, RJ ;
SHU, FH .
ASTROPHYSICAL JOURNAL, 1979, 227 (01) :67-72
[2]   ON THE CENTRAL SURFACE BRIGHTNESS PROBLEM IN DISK GALAXIES [J].
BOSMA, A ;
FREEMAN, KC .
ASTRONOMICAL JOURNAL, 1993, 106 (04) :1394-1404
[3]   DISCOVERY OF A HUGE LOW-SURFACE-BRIGHTNESS GALAXY - A PROTODISK GALAXY AT LOW REDSHIFT [J].
BOTHUN, GD ;
IMPEY, CD ;
MALIN, DF ;
MOULD, JR .
ASTRONOMICAL JOURNAL, 1987, 94 (01) :23-&
[4]   DISCOVERY OF A 2ND GIANT LOW SURFACE BRIGHTNESS GALAXY - FURTHER CONFIRMATION OF SLOWLY EVOLVING DISK GALAXIES [J].
BOTHUN, GD ;
SCHOMBERT, JM ;
IMPEY, CD ;
SCHNEIDER, SE .
ASTROPHYSICAL JOURNAL, 1990, 360 (02) :427-435
[5]   EXTREMELY LOW SURFACE BRIGHTNESS GALAXIES IN THE FORNAX CLUSTER - PROPERTIES, STABILITY, AND LUMINOSITY FLUCTUATIONS [J].
BOTHUN, GD ;
IMPEY, CD ;
MALIN, DF .
ASTROPHYSICAL JOURNAL, 1991, 376 (02) :404-423
[6]  
DAVIES JI, 1990, MON NOT R ASTRON SOC, V244, P8
[7]   LOW SURFACE BRIGHTNESS GALAXIES IN THE FORNAX CLUSTER - AUTOMATED GALAXY SURFACE PHOTOMETRY .3. [J].
DAVIES, JI ;
PHILLIPPS, S ;
CAWSON, MGM ;
DISNEY, MJ ;
KIBBLEWHITE, EJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 232 (02) :239-258
[8]  
de Jong R., 1995, THESIS U GRONINGEN
[9]   SURFACE PHOTOMETRY OF LOW SURFACE BRIGHTNESS GALAXIES [J].
DEBLOK, WJG ;
VANDERHULST, JM ;
BOTHUN, GD .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 274 (01) :235-255
[10]  
DEJONG RS, 1994, ASTRON ASTROPHYS SUP, V106, P451