THE RELATION BETWEEN STAR FORMATION RATE AND STELLAR MASS FOR GALAXIES AT 3.5 ≤ z ≤ 6.5 IN CANDELS

被引：261

作者：

Salmon, Brett ^{[1
]}

Papovich, Casey ^{[1
]}

Finkelstein, Steven L. ^{[2
]}

Tilvi, Vithal ^{[1
]}

Finlator, Kristian ^{[3
]}

Behroozi, Peter ^{[4
,5
,6
,7
]}

Dahlen, Tomas ^{[7
]}

Dave, Romeel ^{[8
,9
,10
,11
]}

Dekel, Avishai ^{[12
]}

Dickinson, Mark ^{[13
]}

Ferguson, Henry C. ^{[7
]}

Giavalisco, Mauro ^{[14
]}

Long, James ^{[15
]}

Lu, Yu ^{[4
,5
,6
]}

Mobasher, Bahram ^{[16
]}

Reddy, Naveen ^{[16
]}

Somerville, Rachel S. ^{[17
]}

Wechsler, Risa H. ^{[4
,5
,6
]}

机构：

[1] Texas A&M Univ, Dept Phys & Astron, George P & Cynthia W Mitchell Inst Fundamental Ph, College Stn, TX 77843 USA

[2] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[3] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen O, Denmark

[4] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[5] SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[6] Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[7] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[8] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[9] Univ Western Cape, Dept Phys, Cape Town, South Africa

[10] S African Astron Observ, ZA-7925 Cape Town, South Africa

[11] African Inst Math Sci, ZA-7945 Cape Town, South Africa

[12] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[13] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[14] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[15] Texas A&M Univ, Dept Stat, College Stn, TX 77843 USA

[16] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[17] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 799卷 / 02期

关键词：

galaxies: distances and redshifts; galaxies: evolution; galaxies: fundamental parameters; Magellanic Clouds; LYMAN-BREAK GALAXIES; HIGH-REDSHIFT GALAXIES; COSMOLOGICAL HYDRODYNAMIC SIMULATIONS; SPECTRAL ENERGY-DISTRIBUTIONS; EMISSION-LINE GALAXIES; ACTIVE GALACTIC NUCLEI; BROAD-BAND PHOTOMETRY; ULTRAVIOLET LUMINOSITY DENSITY; EXTRAGALACTIC LEGACY SURVEY; NEAR-INFRARED SPECTROSCOPY;

D O I：

10.1088/0004-637X/799/2/183

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Distant star-forming galaxies show a correlation between their star formation rates (SFRs) and stellar masses, and this has deep implications for galaxy formation. Here, we present a study on the evolution of the slope and scatter of the SFR-stellar mass relation for galaxies at 3.5 <= z <= 6.5 using multi-wavelength photometry in GOODS-S from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and Spitzer Extended Deep Survey. We describe an updated, Bayesian spectral-energy distribution fitting method that incorporates effects of nebular line emission, star formation histories that are constant or rising with time, and different dust-attenuation prescriptions (starburst and Small Magellanic Cloud). From z = 6.5 to z = 3.5 star-forming galaxies in CANDELS follow a nearly unevolving correlation between stellar mass and SFR that follows SFR similar to M-a* with a = 0.54 +/- 0.16 at z similar to 6 and 0.70 +/- 0.21 at z similar to 4. This evolution requires a star formation history that increases with decreasing redshift (on average, the SFRs of individual galaxies rise with time). The observed scatter in the SFR-stellar mass relation is tight, sigma(log SFR/M-circle dot yr(-1)) < 0.3-0.4 dex, for galaxies with log M*/M-circle dot > 9 dex. Assuming that the SFR is tied to the net gas inflow rate (SFR similar to M-circle dot gas), then the scatter in the gas inflow rate is also smaller than 0.3-0.4 dex for star-forming galaxies in these stellar mass and redshift ranges, at least when averaged over the timescale of star formation. We further show that the implied star formation history of objects selected on the basis of their co-moving number densities is consistent with the evolution in the SFR-stellar mass relation.

引用

页数：27

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