The rest-frame optical properties of z≃3 galaxies

被引:485
作者
Shapley, AE
Steidel, CC
Adelberger, KL
Dickinson, M
Giavalisco, M
Pettini, M
机构
[1] CALTECH, Palomar Observ, Pasadena, CA 91125 USA
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[4] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词
galaxies : evolution; galaxies : formation; galaxies : high-redshift; galaxies : starburst; galaxies : stellar content; infrared : galaxies;
D O I
10.1086/323432
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the results of a near-infrared imaging survey of z similar to 3 Lyman break galaxies (LBGs). The survey covers a total of 30 arcmin(2) and includes 118 photometrically selected LBGs with K(s)-band measurements, 63 of which also have J-band measurements, and 81 of which have spectroscopic redshifts. Using the distribution of optical R magnitudes from previous work and R-K(s) colors for this sub sample, we compute the rest-frame optical luminosity function of LBGs. This luminosity function is described by an analytic Schechter fit with a very steep faint-end slope of alpha = -1.85 +/- 0.15, and it strikingly exceeds locally determined optical luminosity functions at brighter magnitudes, where it is fairly well constrained. The V-band luminosity density of only the observed bright end of the z similar to 3 LBG luminosity function already approaches that of all stars in the local universe. For the 81 galaxies with measured redshifts, we investigate the range of LBG stellar populations implied by the photometry that generally spans the range 900-5500 Angstrom in the rest frame. The parameters under consideration are the star AZ formation rate as a function of time, the time since the onset of star formation, and the degree of reddening and extinction by dust. While there are only weak constraints on the parameters for most of the individual galaxies, there are strong trends in the sample as a whole. With a wider wavelength baseline than most previous studies at similar redshifts, we confirm the trend that intrinsically more luminous galaxies are dustier. We also find that there is a strong correlation between extinction and the age of the star formation episode, in the sense that younger galaxies are dustier and have much higher star formation rates. The strong correlation between extinction and age, which we show is unlikely to be an artifact of the modeling procedure, has important implications for an evolutionary sequence among LBGs. A unified scenario that accounts for the observed trends in bright LBGs is one in which a relatively short period of very rapid star formation (hundreds of M. yr(-1)) lasts for roughly 50-100 Myr, after whichboth the extinction and star formation rate are considerably reduced and stars are formed at a more quiescent, but still rapid, rate for at least a few hundred megayears. In our sample, a considerable fraction (similar to 20%) of the LBGs have best-fit star formation ages greater than or similar to1 Gyr, implied stellar masses of greater than or similar to 10(10) M., and are still forming stars at similar to 30 M. yr(-1).
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收藏
页码:95 / 123
页数:29
相关论文
共 61 条
[1]   Multiwavelength observations of dusty star formation at low and high redshift [J].
Adelberger, KL ;
Steidel, CC .
ASTROPHYSICAL JOURNAL, 2000, 544 (01) :218-241
[2]   A counts-in-cells analysis of Lyman-Break galaxies at redshift z∼3 [J].
Adelberger, KL ;
Steidel, CC ;
Giavalisco, M ;
Dickinson, M ;
Pettini, M ;
Kellogg, M .
ASTROPHYSICAL JOURNAL, 1998, 505 (01) :18-24
[3]  
ADELBERGER KL, 2001, THESIS
[4]  
Alton PB, 1999, ASTRON ASTROPHYS, V343, P51
[5]  
[Anonymous], GALACTIC ASTRONOMY
[6]   The epoch of galaxy formation [J].
Baugh, CM ;
Cole, S ;
Frenk, CS ;
Lacey, CG .
ASTROPHYSICAL JOURNAL, 1998, 498 (02) :504-521
[7]   The luminosity function of galaxies in SDSS commissioning data [J].
Blanton, MR ;
Dalcanton, J ;
Eisenstein, D ;
Loveday, J ;
Strauss, MA ;
Rao, MS ;
Weinberg, DH ;
Anderson, JE ;
Annis, J ;
Bahcall, NA ;
Bernardi, M ;
Brinkmann, J ;
Brunner, RJ ;
Burles, S ;
Carey, L ;
Castander, FJ ;
Connolly, AJ ;
Csabai, I ;
Doi, M ;
Finkbeiner, D ;
Friedman, S ;
Frieman, JA ;
Fukugita, M ;
Gunn, JE ;
Hennessy, GS ;
Hindsley, RB ;
Hogg, DW ;
Ichikawa, T ;
Ivezic, Z ;
Kent, S ;
Knapp, GR ;
Lamb, DQ ;
Leger, RF ;
Long, DC ;
Lupton, RH ;
McKay, TA ;
Meiksin, A ;
Merelli, A ;
Munn, JA ;
Narayanan, V ;
Newcomb, M ;
Nichol, RC ;
Okamura, S ;
Owen, R ;
Pier, JR ;
Pope, A ;
Postman, M ;
Quinn, T ;
Rockosi, CM ;
Schlegel, DJ .
ASTRONOMICAL JOURNAL, 2001, 121 (05) :2358-2380
[8]   Reddening and star formation in starburst galaxies [J].
Calzetti, D .
ASTRONOMICAL JOURNAL, 1997, 113 (01) :162-184
[9]   A search for the submillimetre counterparts to Lyman break galaxies [J].
Chapman, SC ;
Scott, D ;
Steidel, CC ;
Borys, C ;
Halpern, M ;
Morris, SL ;
Adelberger, KL ;
Dickinson, M ;
Giavalisco, M ;
Pettini, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 319 (01) :318-330
[10]   LYMAN-ALPHA EMISSION FROM GALAXIES [J].
CHARLOT, S ;
FALL, SM .
ASTROPHYSICAL JOURNAL, 1993, 415 (02) :580-588