Download VNGS_april2014v2 - McMaster Physics and Astronomy

[CII]/[OI]63
VNGS science highlight: PDR models of M51
([CII]+[OI]63)/FTIR
Similar gas
properties in
arm and
interarm
regions.
Higher densities and stronger radiation fields in center
T. Parkin et al., 2013, ApJ
M51: Gas properties from farinfrared forbidden lines
L(TIR)
[CII] 158 microns
• PACS raster maps of center of M51
• plus SPIRE-FTS map of [NII] 205 micron line
T. Parkin et al., 2013, ApJ
M51: Gas properties from farinfrared forbidden lines
[OI] 63 microns
[NII] 122 microns
• PACS raster maps of center of M51
• Plus [OIII] 88 micron and [OI] 145 micron in strip
T. Parkin et al., 2013, ApJ
Compare to models of Photon
Dominated Regions (PDRs)
Observed
Corrected
• Use models from Kaufman et al. 1999, ApJ
– Two free parameters: strength of UV radiation field (Go) and
gas density (n)
• Some [CII] emission comes from ionized gas --> remove
• [OI] high optical depth --> correct
T. Parkin et al., 2013, ApJ
[CII]/[OI]63
Compare to PDR models
Nucleus
Center
Arm
Interarm
Similar gas
properties in
arm and
interarm
regions
([CII]+[OI]63)/FTIR
Higher densities and stronger radiation fields in center
T. Parkin et al., 2013, ApJ
The Antennae (NGC 4038/9)
Schirm et al., 2014, ApJ
CO J=6-5 map with FTS
Left figure: Wilson et al. 2000, ApJ;
HST image: Whitmore et al. 1999, AJ
Spectral Line Energy
Distributions at three positions
CO lines
Note: true
intensity (not
renormalized)
[CI] lines
J(upper)
Schirm et al., 2014, ApJ
Physical properties of the
cold and warm gas
• Temperature
versus density (left)
and pressure (right)
• Blue = cold gas
• Red = warm gas
• CO+CI solutions
• Column density
versus density (left)
and pressure (right)
Schirm et al., 2014, ApJ
NGC 4125: an unusual elliptical galaxy
250 m
contours on
K-band
image
• Dust mass 6x106 Mo but only upper limits to HI and CO
• submillimeter continuum follows r1/4 profile similar to stars
• Dust to stellar mass ratio 3x10-5 Mo similar to other ellipticals
• Dust in this galaxy produced internally from evolved stars with
gas transitioning rapidly to temperatures > 104 K
(Wilson et al., 2013, ApJL)
Priorities for future work
• Continue analysis of FTS data
– M83: Wu et al. 2014 (referee report received)
– M51: (Schirm et al., analysis underway)
– Other galaxies: Cen A, NGC 891
• Continue analysis of PACS spectroscopy
– NGC 891 (Hughes et al., first draft circulated)
– Other galaxies: NGC 5195, M81, NGC 2403, M83
(outer strip only)
• Overview/cross-galaxy comparison paper(s)?
Dust? Gas? Combined?
• Note: not clear who will work on remaining
data …
VNGS Publications since June, 2013
• T. Parkin et al., 2014, “The physical characteristics of the gas in
the disk of Centaurus A using the Herschel Space Observatory”,
ApJ, in press
• T. Hughes et al., “A resolved analysis of cold dust and gas in the
nearby edge-on spiral NGC 891”, 2014, A&A
• M. Schirm et al., “Herschel-SPIRE Fourier Transform
Spectrometer Observations of Excited CO and [C I] in the
Antennae (NGC 4038/39): Warm and Cold Molecular Gas”,
2014, ApJ
• C. Wilson et al., “Cold Dust but Warm Gas in the Unusual
Elliptical Galaxy NGC 4125”, 2013, ApJ
• T. Parkin et al., “Regional Variations in the Dense Gas Heating
and Cooling in M51 from Herschel Far-infrared Spectroscopy”,
2013, ApJ
• K. Foyle et al., “Star formation and dust heating in the FIR bright
sources of M83”, 2013, MNRAS
Other plans and analysis techniques
• PACS spectroscopy cubes fully processed
and ready to submit to the Herschel archive
• Foyle et al. (2013) paper on M83 applied
getsources to an extragalactic source (see
also Natale, Foyle et al. 2014 for M33)
• Analysis of FTS intermediate sampled maps
underway using source-correction tool from
Wu et al. (2013) in hipe
• Last data delivery will be FTS spectroscopy
– Need to think about what products it makes sense
to deliver beyond the basic processed hipe data