J/A+A/565/A4 NGC 891 70-500um images (Hughes+, 2014)
A resolved analysis of cold dust and gas in the nearby edge-on spiral NGC 891.
Hughes T.M., Baes M., Fritz J., Smith M., Parkin T., Gentile G., Bendo G.,
Wilson C., Allaert F., Bianchi S., De Looze I., Verstappen J., Viaene S.,
Boquien M., Boselli A., Clements D., Davies J., Galametz M., Madden S.,
Remy-Ruyer A., Spinoglio L.
<Astron. Astrophys. 565, A4 (2014)>
=2014A&A...565A...4H 2014A&A...565A...4H
ADC_Keywords: Galaxies, nearby ; Galaxies, IR
Keywords: galaxies: individual: NGC 891 - galaxies: spiral - galaxies: ISM -
infrared: galaxies - submillimeter: galaxies
Abstract:
We investigate the connection between dust and gas in the nearby
edge-on spiral galaxy NGC 891, a target of the Very Nearby Galaxies
Survey. High resolution Herschel Space Observatory PACS and SPIRE 70,
100, 160, 250, 350, and 500 micron images are combined with JCMT SCUBA
850 micron observations to trace the far-infrared/submillimetre
spectral energy distribution (SED). Maps of the HI 21cm line and
CO(J=3-2) emission trace the atomic and molecular hydrogen gas,
respectively. We fit one-component modified blackbody models to the
integrated SED, finding a global dust mass of
(8.5±2.0)x107M☉ and an average temperature of 23±2K,
consistent with results from previous far-infrared experiments. We
also fit one-component modified blackbody models to pixel-by-pixel
SEDs to produce maps of the dust mass and temperature. A comparison of
the dust properties with the gaseous components of the ISM reveals
strong spatial correlations between the surface mass densities of dust
and the molecular hydrogen and total gas surface densities.
Description:
We present new, reduced Herschel Space Observatory PACS and SPIRE 70,
160, 250, 350, and 500 micron observations of NGC 891 taken has part
of the Very Nearby Galaxy Survey (P.I.: C. Wilson) and an additional
PACS 100 micron image taken from the Herschel EDGE-on galaxy Survey
(P.I.: E. Murphy). The PACS 70, 100 and 160 observations were reduced
with the Herschel Interactive Processing Environment (HIPE) v.11.0.1
with PACS Calibration v.32 and Scanamorphos v.22.0 (Roussel,
2013PASP..125.1126R 2013PASP..125.1126R). The SPIRE 250, 350, and 500 micron observations
data were reduced with HIPE v.11.0.12 including the latest calibration
due for inclusion in HIPE v.12.0 (Bendo et al., 2013MNRAS.433.3062B 2013MNRAS.433.3062B),
and BriGAdE (Smith, in preparation). Complete details on the data
reduction may be found in the paper.
Image properties are summarised in images.dat. Please note that the
FITS images presented here do not include the calibration factors to
account for extended sources, nor colour corrections as described in
the paper. The raw data can be retrieved from the Herschel Science
Archive (ESA).
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
02 22 32.91 +42 20 53.9 NGC 891 = UGC 1831
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
images.dat 51 6 Summary of images
images/* . 6 PACS and SPIRE images in FITS format
--------------------------------------------------------------------------------
See also:
J/MNRAS/396/1231 : Astrophotometric catalogue of NGC 891 (Rejkuba+, 2009)
Byte-by-byte Description of file: images.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- Filename Name of the FITS file, in subdirectory images
23- 27 A5 --- Inst Instrument on Herschel (PACS or SPIRE)
29- 31 I3 um lambda [70/500] Wavelength
33- 37 F5.2 arcsec/pix Scale [1.4/12] Image pixel size
39- 42 F4.1 arcsec FWHM [5/37] PSF FWHM
44- 51 A8 --- Unit Flux units of images (Jy/beam or Jy/pixel)
--------------------------------------------------------------------------------
Acknowledgements:
Thomas M. Hughes, thomas.hughes(at)ugent.be
(End) Thomas Hughes [UGent, Belgium], Patricia Vannier [CDS] 24-Feb-2014