Anna Rosa Marenzi

Deep Near-Infrared Images and ISOCAM Observations of Chamaeleon I North

We present the results of deep near-infrared imaging and ISOCAM observations of three selected regions localized in the northern part of the Chamaeleon I dark cloud, in order to search for the low-luminosity population. In an area of 3 × 3 arcmin2 centered on the bipolar molecular outflow, which is the densest part of the cloud, we have discovered a new Class I source (here named ISOCAM–Cha INa2) with a spectral index α = 1.9 and 1–18 μm luminosity of 0.6 L⊙ that is most probably responsible for the observed CO outflow. The comparison between the observed K-magnitude distribution for this region and that obtained for a region outside the outflow and adjacent to the star HD 97300 indicates the possible presence of a very low luminosity young stellar population in the densest part of the cloud.

Mid-IR images of methanol masers and ultracompact HII regions

Paolo Persi1, Mauricio Tapia2 and Anna Rosa Marenzi1 INAF/IASF-Roma Via fosso del Cavaliere,100, oo133 Roma-Italy email: paolo.persi@iasf-roma.inaf.it IA-UNAM Ensenada, Mexico Methanol masers and UCHII regions trace massive star formation sites. We have undertaken a mid-IR survey of 17 regions containing methanol masers and UCHIIs in order to locate the young stellar sources associated with them. The images were obtained from 8.7 to 18.8 μm with the mid-IR camera CID (Salas et al. 2003) on the 2.1m telescope of the Observatorio Astronomico Nacional at San Pedro Martir (Baja California, Mexico). The images were taken with a scale 0.55”/pix and the mean PSF was 1.5-2.0”(FWHM) close to the diffraction limit. We report as an example in Fig. 1 (left panel) our 18.8μm

Infrared and X-ray Emission in High Mass Star Forming Regions

We present a correlated study of IR and X-ray emission in massive star formation regions using X-ray Chandra data and ground-based near, and mid-IR observations in order to understand the mechanisms of X-ray emission associated to high massive protostellar objects. Mon R2, and the complex giant molecular clouds W3 and NGC 6334 are the regions here analyzed.

High mass star formation in the giant molecular cloud NGC 6334: an infrared view

Sub-arcsec images in the JHKs, H2 and Br of three areas (I(N), F and NGC 6334 IV (MM3)) of the giant molecular cloud NGC 6334 are presented. The preliminary results indicate the presence of a deeply embedded young stellar cluster in the northermost part of the cloud (I(N)). We have identied the exciting source of the cometary UCHII NGC 6334 F. This source has an infrared luminosity LIR= 3 10 3 L and a very steep infrared spectral index. Finally, a new center of massive star formation associated with the millimeter peak MM3 has been found east of the bipolar HII region NGC 6334 A.