论文标题
全天候对附近星系的空间分析-II。主要序列 - 以SUB-KPC量表为单位的气体关系
A panchromatic spatially resolved analysis of nearby galaxies -- II. The main sequence - gas relation at sub-kpc scale in grand-design spirals
论文作者
论文摘要
在本系列的第二项工作中，我们分析了气体的可用性与区域位置相对于空间分辨的主序列（MS）关系。遵循论文I中提出的过程，我们获得了500pc量表的恒星质量和星形速率表面密度（$σ_{\ star} $和$σ_{\ rm {sfr}} $）。我们的样本包括位于MS上的五个面对面设计的螺旋星系。多亏了HI 21cm和$^{12} $ CO（2-1）地图，我们将气体表面密度和气体分数连接到每个区域的观察到的恒星形成属性。我们发现，空间解决的MS（$σ= 0.23 $ DEX）是两种关系的组合：Kennicutt-Schmidt Law（$σ= 0.19 $ DEX）和分子气MS（MGMS，$σ= 0.22 $ DEX）; $σ_ {\ star} $，$σ_{\ rm {sfr}} $和分子气的表面密度，$σ_ {\ rm {h_2}} $，根据\ citet {2019apj ... 884l..333l..33l..33l..33l..33l..33l..333l..333l}定义了3D关系。我们发现，$σ_{\ rm {h_2}} $沿MS关系稳步增加，在固定恒星表面密度下（不足以维持SFR的变化），差异更高的$σ_ {\ rm {sfr}} $，并且几乎是恒定的，并且与关系持续不断。中性气的表面密度（$σ_ {\ rm {hi}} $）是沿MS恒定的，并且在其上部信封中增加。 $σ_ {\ rm {sfr}} $可以表示为$σ_ {\ star} $和$σ_{\ rm {hi}} $的函数。 1.99 $ \logς_ {\ rm {hi}} $ -11.11。最后，我们表明f $ _ {\ rm {gas}} $在$ \logς_ {\ star} $ - $ \logς_ {\ rm {sfr}} $平面的$ \logς_ {\ star} $ - $ \ logDIOM- $ \ logDION中显着增加。
In the second work of this series, we analyse the connection between the availability of gas and the position of a region with respect to the spatially resolved main sequence (MS) relation. Following the procedure presented in Paper I we obtain 500pc scales estimates of stellar mass and star formation rate surface densities ($Σ_{\star}$ and $Σ_{\rm{SFR}}$). Our sample consists of five face-on, grand design spiral galaxies located on the MS. Thanks to HI 21cm and $^{12}$CO(2-1) maps, we connect the gas surface densities and gas fractions to the observed star formation properties of each region. We find that the spatially resolved MS ($σ=0.23$ dex) is the combination of two relations: the Kennicutt-Schmidt law ($σ=0.19$ dex) and the molecular gas MS (MGMS, $σ=0.22$ dex); $Σ_{\star}$, $Σ_{\rm{SFR}}$ and the surface density of the molecular gas, $Σ_{\rm{H_2}}$, define a 3D relation as proposed by \citet{2019ApJ...884L..33L}. We find that $Σ_{\rm{H_2}}$ steadily increases along the MS relation, varies little towards higher $Σ_{\rm{SFR}}$ at fixed stellar surface densities (not enough to sustain the change in SFR), and it is almost constant perpendicular to the relation. The surface density of neutral gas ($Σ_{\rm{HI}}$) is constant along the MS, and increases in its upper envelop. $Σ_{\rm{SFR}}$ can be expressed as a function of $Σ_{\star}$ and $Σ_{\rm{HI}}$, following the Equation: $\logΣ_{\rm{SFR}}$ = 0.97$\logΣ_{\star}$ + 1.99$\logΣ_{\rm{HI}}$ - 11.11. Finally, we show that f$_{\rm{gas}}$ increases significantly towards the starburst region in the $\logΣ_{\star}$ - $\logΣ_{\rm{SFR}}$ plane, accompanied by a slight increase in SFE.
