The Disks of Galaxies with Seyfert and Starburst Nuclei. II. Near-Infrared Structural Properties
The Disks of Galaxies with Seyfert and Starburst Nuclei. II. Near-Infrared Structural Properties
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DOI：
10.1086/306607
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发表时间：
1998-08
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影响因子：
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通讯作者：
L. Hunt;M. Malkan;G. Moriondo;M. S. CAISMI-CNR;Ucla;U. Florence;Arcetri Observatory
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文献类型：
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作者：
L. Hunt;M. Malkan;G. Moriondo;M. S. CAISMI-CNR;Ucla;U. Florence;Arcetri Observatory
本文用一种新的二维分解算法拟合了一个Seyfert和SBN宿主星系的近红外图像，得到了它们的近红外结构分量。拟合参数的分析表明，Seyfert 1和SBN凸起在结构和颜色上类似于正常的早型凸起，（J-K）比盘（J-K）红约0.1等。另一方面，Seyfert 2凸起比正常的更蓝，具有（J-K）~（J-K）。塞弗特盘（尤其是1型），但不是SBN的那些，是异常明亮的（在表面亮度），甚至比最亮的正常磁盘显着。塞弗特盘也是紧凑的，但与正常的早期螺旋相似。对于给定的质量，塞弗特星系和SBN星系异常富含中性氢，并且有强有力的证据表明，尽管间接，在塞弗特和SBN盘中的质量/光（M/L）比较低，但在它们的凸起中的M/L比正常。在Seyfert星系和SBN星系中，H I质量分数和M/L比是相关的，我们把SBN和几个Seyfert星系中的高气体质量分数和低M/L比归因于正在进行的星星形成。塞弗特星系中如此丰富的气体预计会抑制棒的形成，这可能解释为什么活动星系并不总是有棒。
We have derived the near-infrared structural components of a sample of Seyfert and starburst (SBN) host galaxies by fitting near-infrared images with a new two-dimensional decomposition algorithm. An analysis of the fitted parameters shows that Seyfert 1 and SBN bulges resemble normal early-type bulges in structure and color, with (J-K) about 0.1 mag redder than disk (J-K). Seyfert 2 bulges, on the other hand, are bluer than normal, with (J-K) ~ (J-K). Seyfert disks (especially type 1), but not those of SBNs, are abnormally bright (in surface brightness), significantly more so than even the brightest normal disks. Seyfert disks are also compact, but similar to those in normal early-type spirals. For a given mass, Seyfert and particularly SBN galaxies are abnormally rich in neutral hydrogen, and there is strong, albeit indirect, evidence for lower mass-to-light (M/L) ratios in Seyfert and SBN disks, but normal M/L ratios in their bulges. In Seyfert and SBN galaxies, H I mass fractions and M/L ratios are anticorrelated, and we attribute the high gas mass fractions and low M/L ratios in SBNs and several Seyfert galaxies to ongoing star formation. Such abundant gas in Seyfert galaxies would be expected to inhibit bar formation, which may explain why active galaxies are not always barred.