arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.03398astro-ph.GA
收藏

SDSS-IV MaNGA:紧密星系对中增强恒星形成的径向剖面

SDSS-IV MaNGA: The Radial Profile of Enhanced Star Formation in Close Galaxy Pairs

Joshua L. Steffen, Hai Fu, J. M. Comerford, Y. Sophia Dai, Shuai Feng, Arran C. Gross, Rui Xue

摘要:

我们比较了特定的恒星形成率(sSFR)的径向配置文件中的169个恒星形成星系的样本中的密切配对与质量匹配的控制星系在SDSS-IV的MANGA调查。我们发现,sSFR中心增强(一个有效半径内)在相互作用的星系~0.3德克斯和有一个弱的sSFR抑制在外围的星系~0.1德克斯。我们将星系的差异分布叠加在log(M/Mstar)= 9.0-11.5的五个恒星质量仓中,发现sSFR增强与恒星质量无关。当比较星系在恒星质量和红移方面与每个配对星系匹配时,也会得到相同的结果。此外,我们发现,sSFR增强是升高的对几乎相等的质量和更接近的投影分离,与以前的工作的基础上单光纤光谱。我们还发现,在配对星系的外围的sSFR偏移量取决于星系是否是更大质量或更小质量的同伴对。质量较大的伴星经历零到正的sSFR增强,而质量较小的伴星在其外围经历sSFR抑制。我们的结果说明了复杂的潮汐效应对恒星形成的密切配对星系。

英文摘要:

We compare the radial profiles of the specific star formation rate (sSFR) in a sample of 169 star-forming galaxies in close pairs with those of mass-matched control galaxies in the SDSS-IV MaNGA survey. We find that the sSFR is centrally enhanced (within one effective radius) in interacting galaxies by ~0.3 dex and that there is a weak sSFR suppression in the outskirts of the galaxies of ~0.1 dex. We stack the differences profiles for galaxies in five stellar mass bins between log(M/Mstar) = 9.0-11.5 and find that the sSFR enhancement has no dependence on the stellar mass. The same result is obtained when the comparison galaxies are matched to each paired galaxy in both stellar mass and redshift. In addition, we find that that the sSFR enhancement is elevated in pairs with nearly equal masses and closer projected separations, in agreement with previous work based on single-fiber spectroscopy. We also find that the sSFR offsets in the outskirts of the paired galaxies are dependent on whether the galaxy is the more massive or less massive companion in the pair. The more massive companion experiences zero to a positive sSFR enhancement while the less massive companion experiences sSFR suppression in their outskirts. Our results illustrate the complex tidal effects on star formation in closely paired galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑