论文标题
超灯边缘螺旋星系的H-alpha图像
H-alpha Images of Ultra-Flat Edge-On Spiral Galaxies
论文作者
论文摘要
我们介绍了几乎可以看到边缘的Ultra-Flat（UF）螺旋星系的H $α$图像。星系在$ b $ band $ a> 1.9^{\ prime} $和表观轴向比率$（A/B）> 10 $中具有角直径。我们发现他们的h $α$图像平均看起来是红色连续体的图像薄的两倍。如果我们使用UF星系中的内部灭绝，则根据H $α$通量确定的恒星形成率与从Galex调查中根据Galex调查的$ fuv $通量计算得出的恒星形成率非常吻合。 UF星系中特定恒星形成率的对数显示出较小的散布，$ 0.19 $，从矮螺旋式的$ -10.4 $ $ -10.4 $降至$ -10.7 $。 UF磁盘中的氢质量的相对量从矮圆盘中的约50 \％到大量磁盘的大约8％。在UF星系（约16 \％）中，结构扭曲不及厚的（较不孤立的）螺旋星系的磁盘。在宇宙时间尺度上，比矮螺旋出现了13.7 Gyr，大型螺旋盘对恒星的气体加工更有效。
We present the H$α$ images of ultra-flat (UF) spiral galaxies seen practically edge-on. The galaxies have the angular diameter in the $B$ band $a> 1.9^{\prime}$ and the apparent axial ratio $(a/b) >10$. We found that their H$α$ images look, on average, almost two times thinner than those in the red continuum. The star-formation rate in the studied objects, determined from the H$α$ flux, is in good agreement with that calculated from the $FUV$ flux from the GALEX survey if we use the modified Verheijen and Sancisi formula taking into account the internal extinction in the UF galaxies. The logarithm of the specific star-formation rate in the UF galaxies shows a small scatter, $0.19$, with a smooth decrease from $-10.4$ for dwarf spirals to $-10.7$ for massive ones. The relative amount of the hydrogen mass in UF disks varies from about 50\% in dwarf disks to about 8\% in massive ones. Structural distortions are less common in the UF galaxies (about 16\%) than those in thick (less isolated) disks of edge-on spiral galaxies. On the cosmic time scale, 13.7 Gyr, large spiral disks are more efficient "engines" for gas processing into stars than dwarf spirals.
