Augusto Damineli IAGUSP

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NIR studies of GHIIRs
Augusto Damineli (IAGUSP) Robert Blum
(CTIO) Peter Conti (JILA) Elysandra Figuerêdo
(IAGUSP) Natalia Tambellini (IAGUSP)
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radio surveys
H recombination lines gt radial velocities
rotation model
gt Distances to HII regions
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kinamatic distances
Limitations of the method

• Rotation model untested in the inner Galaxy
• Radial Velocities 2-valued DltD?, degenerate
  toward GC
• Non-rotational components - champagne flows in
  HII regions (?10 Km/s)

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G333.1-0.4
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Spectral classification G333.1-0.4 Hanson, Conti
Rieke 1997
Dspp 2.6 0.4 kpc
O6V
O8V
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Cluster members
2-sky field
1-2 members
1-whole field
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Correcting for excess emission
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The K-ban luminosity function
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The IMF
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Cluster integrated properties
-1.3 lt ?lt -1.1
0.2 x1050 ltNLyC ph/slt 1.9x1050
1 x103 ltMcluster/M?lt 1.3x103
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The luminosity function is independent of the
Galactic envitonment
K-band LuminosityFunction
--- NGC3576
--- G333.1-0.4
? 0.35 ? 0.05
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Bik
Blum et al.
Hanson, Howarth Conti
Figuerêdo et al.
Stolte et al.
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Milky Way top view HII regions
Russeil 2003
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GHIIRs kinematic distances -radio
Conti Crowther 2004
Sun
GC
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Kinematic distances breaking the ambiguity
Russeil 2003 W51A Dkin 5.5 kpc Dspp
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Kinematic distances breaking the ambiguity
Russeil 2003 G151.6-0.2 Kin dist 8.4 kpc
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Kinematic distances breaking the ambiguity
Russeil 2003 G59.9-0.2 Kin dist 2.6 kpc
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GHIIRs kinematic distances -radio
Conti Crowther 2004
Sun
GC
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GHIIRs Spectroscopic parallax
This work
Sun
GC
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GHIIRs Spectroscopic parallax
Is there a bias leading to smaller distances?
Calibration uncertainty r.m.s. MV 0.7
Vacca et al. 1996 Constrained by multiple spectra
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GHIIR Luminosity Function (NLyC)
Galaxy H-type a ----------------------- M33
Scd -2.3 M81 Sab
-2.1 LMC Irr -1.7 Milky Way
-2.3 Smith Kennicutt 1989
This work Milky Way a -2.2
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Average Ha Luminosity (largest 3)
Smith Kennicutt 1989
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M51 Sbc
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M74 Sc
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M33 Scd