Exploring the correlation between Hα-to-UV ratio and burstiness for typical star-forming galaxies at z ∼ 2

被引：7

作者：

Rezaee, Saeed ^{[1
]}

Reddy, Naveen A. ^{[1
]}

Topping, Michael W. ^{[2
]}

Shivaei, Irene ^{[2
]}

Shapley, Alice E. ^{[3
]}

Fetherolf, Tara ^{[1
]}

Kriek, Mariska ^{[4
]}

Coil, Alison ^{[5
]}

Mobasher, Bahram ^{[1
]}

Siana, Brian ^{[1
]}

Du, Xinnan ^{[6
]}

Khostovan, Ali Ahmad ^{[7
]}

Weldon, Andrew ^{[1
]}

Emami, Najmeh ^{[8
]}

Chartab, Nima ^{[9
]}

机构：

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

[2] Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA

[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[4] Univ Calif Berkeley, Astron Dept, Berkeley, CA 94720 USA

[5] Univ Calif San Diego, Dept Phys, Ctr Astrophys & Space Sci, 9500 Gilman Dr, La Jolla, CA 92093 USA

[6] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA

[7] NASA, Div Astrophys, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[8] Univ Minnesota, Minnesota Inst Astrophys, 116 Church St SE, Minneapolis, MN 55455 USA

[9] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 526卷 / 01期

关键词：

dust; extinction; galaxies: evolution; galaxies: high-redshift; galaxies: ISM; galaxies: starbursts; DUST ATTENUATION CURVE; X-RAY-EMISSION; LYMAN-BREAK GALAXIES; MASS-METALLICITY RELATION; RESOLVED STELLAR POPULATIONS; HIGH-REDSHIFT GALAXIES; MOSDEF SURVEY; FORMATION HISTORIES; FORMATION RATES; DWARF GALAXIES;

D O I：

10.1093/mnras/stad2842

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The -to-UV luminosity ratio () is often used to probe bursty star formation histories (SFHs) of star-forming galaxies and it is important to validate it against other proxies for burstiness. To address this issue, we present a statistical analysis of the resolved distribution of star formation rate surface density (Sigma(SFR)) as well as stellar age and their correlations with the globally measured for a sample of 310 star-forming galaxies in two redshift bins of 1.37 < z < 1.70 and 2.09 < z < 2.61 observed by the MOSFIRE Deep Evolution Field (MOSDEF) survey. We use the multiwaveband CANDELS/3D-HST imaging of MOSDEF galaxies to construct Sigma(SFR) and stellar age maps. We analyse the composite rest-frame far-ultraviolet spectra of a subsample of MOSFIRE Deep Evolution Field (MOSDEF) targets obtained by the Keck Low Resolution Imager and Spectrometer (LRIS), which includes 124 star-forming galaxies (MOSDEF-LRIS) at redshifts 1.4 < z < 2.6, to examine the average stellar population properties, and the strength of age-sensitive far-ultraviolet spectral features in bins of . Our results show no significant evidence that individual galaxies with higher are undergoing a burst of star formation based on the resolved distribution of Sigma(SFR) of individual star-forming galaxies. We segregate the sample into subsets with low and high . The high- subset exhibits, on average, an age of = 8.0, compared to to log[Age/yr] = 8.4 for the low- galaxies, though the difference in age is significant at only the 2 sigma level. Furthermore, we find no variation in the strengths of Siiv lambda lambda 1393, 1402 and Civ lambda lambda 1548, 1550 P-Cygni features from massive stars between the two subsamples, suggesting that the high- galaxies are not preferentially undergoing a burst compared to galaxies with lower . On the other hand, we find that the high- galaxies exhibit, on average, more intense Heii lambda 1640 emission, which may possibly suggest the presence of a higher abundance of high-mass X-ray binaries.

引用

页码：1512 / 1527

页数：16

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