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arXiv 0709.4047astro-ph
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B335中的Herbig-Haro流

Herbig-Haro flows in B335

M. Gålfalk, G. Olofsson

摘要:

我们已经观察到光学(Halpha和[SII])和近红外(H2的S(1)线)深场,并使用2.56 m NOT拍摄光谱,以及使用3.58 m NTT拍摄近紫外深场(U带)。此外,我们提出了新的SPITZER(IRAC和MIPS)中红外观测。我们使用15年前和9年前的Halalpha和S(1)观测值来制作自行图。然后,我们调查的冲击物理匹配我们的光谱与平面冲击模型。我们在B335中发现了六个新的HH天体。从自行我们发现一个光学明亮,大致E-W方向的集团与高空间速度(200-280公里/秒)和近红外明亮,较慢的集团(15-75公里/秒)向ESE移动。我们还发现了一个系统,至少有15个H2节的西瓣。这种(西北偏西)逆流表明一个二元流出源的可能性,产生两个流出轴略有不同的方向。我们发现,E-W流是对称的两个爆发的证据。我们首次检测到HH 119 B中的[OI] 6300/63和HH 119 A和B中的H β,发现它们的比值分别为AV~1.4和4.4。发现HH 119 A的膨胀速度比预期的要快得多,从线性膨胀与流出源的距离。使用平面激波模型,我们发现激波速度为~60 km/s(A)和~35 km/s(B和C)。这与A比B和C具有更高的激发相一致。在我们的U图像中,我们检测到三个HH物体,并提出发射来自[OII] 3728线和蓝色连续谱。新的SPITZER观测显示,大多数HH物体的直径为4.5微米,在流出源处有一个东西向的细长沙漏状结构。即使在24微米,也不清楚大部分光是直射还是反射。

英文摘要:

We have observed optical (Halpha and [SII]) and near-IR (S(1) line of H2) deep fields and taken optical spectra using the 2.56m NOT, as well as a near-UV deep field (U band) using the 3.58m NTT. In addition we present new SPITZER (IRAC and MIPS) mid-IR observations. We use previous Halpha and S(1) observations taken 15 and 9 years earlier to make proper motion maps. We then investigate the shock physics by matching our spectra with planar shock models. We discover six new HH objects in B335. From proper motions we find an optically bright, roughly E-W oriented group with high space velocities (200-280 km/s) and a near-IR bright, slower group (15-75 km/s) moving to the ESE. We also find a system of at least 15 H2 knots in the western lobe. This (WNW) counterflow suggests the possibility of a binary outflow source, giving rise to two outflow axes with slightly different orientations. We find that the E-W flow is symmetrical with evidence for two outbursts. We make the first detection of [OI] 6300/63 in HH119 B and Hbeta in HH119 A and B and find their extinctions to be AV~1.4 and 4.4, respectively. HH119 A is found to expand much faster than expected from linear expansion with distance from the outflow source. Using planar shock models we find shock velocities of ~60 km/s (A) and ~35 km/s (B and C). This agrees with A being of higher excitation than B and C. In our U image we detect three of the HH objects and propose that the emission arise from the [OII] 3728 line and the blue continuum. New SPITZER observations show most of the HH objects at 4.5 micron and a E-W elongated hour-glass shaped structure at the outflow source. Even at 24 micron it is not clear whether most of the light is direct or reflected.

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