Cassio Leandro Barbosa W51 IRS2 Cassio Leandro Barbosa

Outline What we know What we don't know T-ReCS, NIFS PseudoLong Slit Analysis (PLSA)‏ What we don't know NIFS Principal Component Analysis (PCA)‏ Pilot project on PCA of HII regions Questions not allowed for this part!

W51 IRS2 introducing

W51 IRS2

W51 IRS2

W51 IRS2

W51 IRS2

W51 IRS2 introducing the field

The W51 IRS2 field

Mid Infrared - T-ReCS

Near Infrared – NIFS PLS Analysis

Near Infrared – NIFS PLS Analysis

NIFS: enters the Principal Component Analysis (PCA)‏ With special thanks to Joao Steiner and Tiago Ricci (IAG-USP)‏

W51 – the continuum (21035A-21342A) emission (and reflection?)‏

Double stars? after a R-L deconvolution

Image and spectra “Feature enhanced” Br gamma, blue cont. and red cont.

Nebular emission from the lines 2. 2864 um ([Se IV] Nebular emission from the lines 2.2864 um ([Se IV]? Blum & MacGregor 2008) and 2.2858 um 233 231 235

Nebular emission from the lines 2. 2865 ([Se IV]. )um and 2 Nebular emission from the lines 2.2865 ([Se IV]?)um and 2.2858 um 233 231 235

The He I 21126 A emission

The [Fe III] 22184 A emission

The H2 21218 A emission

The W51-235 fragmented H2 cloud H2 at rest + red and blue wings

Field 233

W51 - Conclusions Ideal (complicate) lab for massive star formation: all stages of MSF in a such small region. 2 naked O3 (and where are the mid/late O??)‏ 3 UCHII regions 1 (or 3?) MYSO with disk 1 younger MYSO producing a jet(?)‏ Photoionized nebulae (high/medium)‏ Non-fragmented H2 clouds Fragmented H2 clouds More stars to come or ionization front?

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