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arXiv 1012.3406astro-ph.SR
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OF NGC 602:用哈勃和斯皮策太空望远镜观测时间分辨的恒星形成

A Panchromatic View OF NGC 602: Time-Resolved Star Formation with the Hubble and Spitzer Space Telescopes

Lynn Redding Carlson, Marta Sewilo, Margaret Meixner, Krista A. Romita, Barbara Whitney, Joseph L. Hora, M. Cignoni, E. Sabbi, A. Nota, M. Sirianni, L. J. Smith… 展开作者

Lynn Redding Carlson, Marta Sewilo, Margaret Meixner, Krista A. Romita, Barbara Whitney, Joseph L. Hora, M. Cignoni, E. Sabbi, A. Nota, M. Sirianni, L. J. Smith, K. Gordon, B. Babler, S. Bracker, J. S. Gallagher, M. Meade, K. Misselt, A. Pasquali, B. Shiao

摘要:

本文给出了小麦哲伦云翼中恒星形成星团NGC 602的测光表,其波长范围从光学HST/ACS(F555 W,F814 W)和SMARTS/ANDICAM(V,I)到红外(Spitzer/IRAC 3.6,4.5,5.8,8微米和MIPS 24微米)。结合IRSF(红外巡天设施)近红外测光(J,H,Ks),我们比较年轻的主序(MS)和主序前(PMS)人口突出的光学与当前年轻的恒星对象(YSO)人口揭示的红外(IR)。我们分析MS和PMS人口与等时线的颜色星等图,以获得年龄和质量。光学数据揭示了约565个PMS候选者,低质量的第三阶段YSO。我们通过将其光谱能量分布(SED)拟合到模型网格(Robitaille等人,2007年)来表征约40个YSO,以获得光度,质量和演化阶段(阶段I-III)。更高分辨率的HST图像显示,约70%的YSO候选者是多重星系团或原星系团。对于YSO和PMS源发现共同的,我们发现在群众派生的一致性。我们利用YSO质量函数推导出现今的恒星形成速率约为0.2-1.0 Msun/yr/kpc ^2,这与从光学恒星形成历史中推导出的速率相似,表明该区域的恒星形成速率是恒定的。我们展示了从光学星团中心到恒星形成尘埃云边缘的恒星形成过程。我们推导出YSO第一阶段和第二阶段的寿命为10^5年。

英文摘要:

We present the photometric catalogs for the star-forming cluster NGC 602 in the wing of the Small Magellanic Cloud covering a range of wavelengths from optical HST/ACS (F555W, F814W) and SMARTS/ANDICAM (V, I) to infrared (Spitzer/IRAC 3.6, 4.5, 5.8, and 8 micron and MIPS 24 micron). Combining this with IRSF (InfraRed Survey Facility) near-infrared photometry (J, H, Ks), we compare the young main sequence (MS) and pre-main sequence (PMS) populations prominent in the optical with the current young stellar object (YSO) populations revealed by the infrared (IR). We analyze the MS and PMS population with isochrones in color-magnitude diagrams to derive ages and masses. The optical data reveal ~565 PMS candidates, low mass Stage III YSOs. We characterize ~40 YSOs by fitting their spectral energy distributions (SEDs) to a grid of models (Robitaille et al. 2007) to derive luminosities, masses and evolutionary phase (Stage I-III). The higher resolution HST images reveal that ~70% of the YSO candidates are either multiples or protoclusters. For YSOs and PMS sources found in common, we find a consistency in the masses derived. We use the YSO mass function to derive a present-day star-formation rate of ~0.2-1.0 Msun/yr/kpc^2, similar to the rate derived from the optical star formation history suggesting a constant star formation rate for this region. We demonstrate a progression of star formation from the optical star cluster center to the edge of the star forming dust cloud. We derive lifetimes of a few 10^5 years for the YSO Stages I and II.

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