Mid-infrared images of the massive star forming region W75 N

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作者：
Persi, P. [1 ]
Tapia, M. [2 ]
Smith, H.A. [3 ]
机构：
[1] Istituto Astrofisica Spaziale e Fisica Cosrnica, INAF, via fosso del cavaliere 100, 00133 Roma, Italy
[2] Instituto de Astronomía, UNAM, Apartado Postal 877, 22830 Ensenada, BC, Mexico
[3] Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
来源：
Astronomy and Astrophysics | 1600年 / 445卷 / 03期
关键词：
An infrared study that includes ground-based mid-infrared images between 8.7 and 18.7 μm and IRAC images at 3.6,4.5, 5.8 and 8.0 μm of the W75 N massive star forming region is presented. The 12.5 7mu; m image shows the presence of four mid-infrared sources in the region W75 N(B); three of which have bright near-infrared counterparts; IRS; 1; IRS 2 and IRS 3; all with significant excess emission at λ > 2.0 μm. IRS 2 has a steep energy distribution and the computed infrared luminosity is consistent with the presence of a young B3 star. The observed IRAC colors of IRS 3 indicate that this source is a Class II intermediate mass young star; consistent with its infrared energy distribution and luminosity. The fourth; newly discovered; mid-infrared source appears coincident with the ultracompact HII region VLA 3; and is located within the millimeter core MM 1. We derived a luminosity of ∼ 750 Lo and a visual extinction Av 90 for this source. From the IRAC images; we detected 75 sources in an area of 120″ × 120″ centered in W75 N. At least 25 of these sources are associated with the molecular cloud and form a young stellar cluster as shown in the IRAC two-color and the H - Ks versus Ks - [3.6] diagrams. © ESO 2006;
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页码：971 / 978
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