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J-PLUS:恒星形成主序和d < 75 Mpc时的速率密度

J-PLUS: The star formation main sequence and rate density at d < 75 Mpc

G. Vilella-Rojo, R. Logroño-García, C. López-Sanjuan, K. Viironen, J. Varela, M. Moles, A. J. Cenarro, D. Cristóbal-Hornillos, A. Ederoclite, C. Hernández-Monte… 展开作者

G. Vilella-Rojo, R. Logroño-García, C. López-Sanjuan, K. Viironen, J. Varela, M. Moles, A. J. Cenarro, D. Cristóbal-Hornillos, A. Ederoclite, C. Hernández-Monteagudo, A. Marín-Franch, H. Vázquez Ramió, L. Galbany, R. M. González Delgado, A. Hernán-Caballero, A. Lumbreras-Calle, P. Sánchez-Blázquez, D. Sobral, J. M. Vílchez, J. Alcaniz, R. E. Angulo, R. A. Dupke, L. Sodré

摘要:

我们的目标是利用Javalambre光度局部宇宙巡天(J-PLUS)第一次发布的数据估计z <= 0.017(d < 75 Mpc)处的恒星形成主序(SFMS)和恒星形成率密度(SFRD),该数据探测897.4 deg 2的12个光学波段。我们从J-PLUS滤波器J 0660中提取了805个本星系的H α辐射通量,这是用其他11个J-PLUS带估计的连续谱水平,并用经验关系修正了尘埃衰减和氮污染。恒星质量(M),H α光度(L)和恒星形成率(SFR)通过考虑参数协方差进行估计。我们的样本包括689个蓝色星系和67个红色星系,分类在(u-g)vs(g-z)色色图中,加上49个活动星系核。SFMS在log M > 8时被探测到,它被蓝色星系清楚地定义,红色星系位于它们下面。SFMS描述为log SFR = 0.83 log M - 8.44。我们发现一个很好的协议与以前的估计SFMS,特别是那些基于积分场光谱。不含活动星系核的样本的H α光度函数可以用Schechter函数很好地描述,log L* = 41.34,log phi* =-2.43,alpha =-1.25。我们的测量提供了一个较低的特征光度比文献中的几个以前的研究。在d < 75 Mpc时,得到的恒星形成率密度为log rho_SFR = -2.10 +-0.11,其中红星系占SFRD的15%。我们的值低于以前的估计,在类似的红移,并提供了一个本地的参考有关宇宙的恒星形成历史的演化研究。

英文摘要:

Our goal is to estimate the star formation main sequence (SFMS) and the star formation rate density (SFRD) at z <= 0.017 (d < 75 Mpc) using the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, that probes 897.4 deg2 with twelve optical bands. We extract the Halpha emission flux of 805 local galaxies from the J-PLUS filter J0660, being the continuum level estimated with the other eleven J-PLUS bands, and the dust attenuation and nitrogen contamination corrected with empirical relations. Stellar masses (M), Halpha luminosities (L), and star formation rates (SFRs) were estimated by accounting for parameters covariances. Our sample comprises 689 blue galaxies and 67 red galaxies, classified in the (u-g) vs (g-z) color-color diagram, plus 49 AGN. The SFMS is explored at log M > 8 and it is clearly defined by the blue galaxies, with the red galaxies located below them. The SFMS is described as log SFR = 0.83 log M - 8.44. We find a good agreement with previous estimations of the SFMS, especially those based on integral field spectroscopy. The Halpha luminosity function of the AGN-free sample is well described by a Schechter function with log L* = 41.34, log phi* = -2.43, and alpha = -1.25. Our measurements provide a lower characteristic luminosity than several previous studies in the literature. The derived star formation rate density at d < 75 Mpc is log rho_SFR = -2.10 +- 0.11, with red galaxies accounting for 15% of the SFRD. Our value is lower than previous estimations at similar redshift, and provides a local reference for evolutionary studies regarding the star formation history of the Universe.

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