J/A+A/597/A130 HI and 250um images of the Virgo cirrus (Bianchi+, 2017)
The Herschel Virgo Cluster Survey.
XX. Dust and gas in the foreground Galactic cirrus.
Bianchi S., Giovanardi C., Smith M.W.L., Fritz J., Davies J.I.,
Haynes M.P., Giovanelli R., Baes M., Bocchio M., Boissier S., Boquien M.,
Boselli A., Casasola V., Clark C.J.R., De Looze I.,
di Serego Alighieri S., Grossi M., Jones A.P., Hughes T.M., Hunt L.K.,
Madden S., Magrini L., Pappalardo C., Ysard N., Zibetti S.
<Astron. Astrophys. 597, A130 (2017)>
=2017A&A...597A.130B 2017A&A...597A.130B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Photometry, millimetric/submm ;
Interstellar medium
Keywords: dust, extinction - radiation mechanisms: thermal -
infrared: ISM - submillimeter: ISM - radio lines: ISM -
local interstellar matter
Abstract:
We study the correlation between far-infrared/submm dust emission and
atomic gas column density in order to derive the properties of the
high Galactic latitude, low density, Milky Way cirrus in the
foreground of the Virgo cluster of galaxies. Dust emission maps from
60 to 850um are obtained from SPIRE observations carried out within
the Herschel Virgo Cluster Survey, complemented by IRAS-IRIS and
Planck-HFI maps. Data from the Arecibo legacy Fast ALFA Survey is used
to derive atomic gas column densities for two broad velocity
components, low and intermediate velocity clouds. Dust emissivities
are derived for each gas component and each far-infrared/submm band.
For the low velocity clouds, we measure an average emissivity
{epsilon]_νLVC=(0.79±0.08)*10-20MJy.cm2^/sr at 250um. After
fitting a modified blackbody to the available bands, we estimated a
dust absorption cross-section
τνLVC/NHI=(0.49±0.13)*10-25cm2^/H at 250um (with dust
temperature T=20.4±1.5K and spectral index β=1.53±0.17). The
results are in excellent agreement with those obtained by Planck over
a much larger coverage of the high Galactic latitude cirrus (50% of
the sky vs 0.2% in our work). For dust associated with intermediate
velocity gas, we confirm earlier Planck results and find a higher
temperature and lower emissivity and cross-section. After subtracting
the modelled components, we find regions at scales smaller than 20'
where the residuals deviate significantly from the average,
cosmic-infrared-background dominated, scatter. These large residuals
are most likely due to local variations in the cirrus dust properties
(and/or the dust/atomic-gas correlation) or to high-latitude molecular
clouds with average NH2≲1020cm-2. We find no conclusive
evidence for intracluster dust emission in Virgo.
Description:
Images of the Virgo cirrus in the atomic gas HI emission and in the
dust emission at 250um from Herschel-SPIRE. Two images are provided
for HI emission from low velocity (LVC; -20km/s<v<100km/s) and
intermediate velocity (IVC; -100km/s<v←20km/s) clouds. The images are
the same presented in the left and mid panels of Fig. 3 in the paper.
Three images are provided at 250um: the observations, with large scale
offsets removed; the model, obtained from the emissivity values
derived in the paper and the two atomic gas maps; the residuals
between observations and models. The three images have been obtained
from observations/model/residuals for each of the four HeViCS fields,
and combined in a single large scale map after removing field-to-field
offsets; they are the same presented in Fig. 8 of the paper. In all
cases the resolution is 4.8'.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 94 5 List of fits images
fits/* . 5 Individual fits images
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See also:
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/MNRAS/419/3505 : The HeViCS Bright Galaxy Sample (Davies+, 2012)
J/MNRAS/428/1880 : FIR properties of VCC galaxies (Auld+, 2013)
J/A+A/552/A8 : 454 VCC galaxies revised coord. (di Serego Alighieri+ 2013)
J/A+A/573/A129 : HeViCS. SPIRE point-source catalogs (Pappalardo+, 2015)
J/A+A/574/A126 : HeViCS. XVIII. Star-forming dwarf galaxies (Grossi+, 2015)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 21 I2 arcsec/pix scale Scale of the image
23- 25 I3 --- Nx Number of pixels along X-axis
27- 29 I3 --- Ny Number of pixels along Y-axis
31- 33 I3 Kibyte size Size of FITS file
35- 46 A12 --- FileName Name of FITS file, in subdirectory fits
48- 94 A47 --- Title Title of the FITS file
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Acknowledgements:
Simone Bianchi, sbianchi(at)arcetri.astro.it
References:
Davies et al., Paper I 2010A&A...518L..48D 2010A&A...518L..48D
Cortese et al., Paper II 2010A&A...518L..49C 2010A&A...518L..49C
Clemens et al., Paper III 2010A&A...518L..50C 2010A&A...518L..50C
Smith et al., Paper IV 2010A&A...518L..51S 2010A&A...518L..51S
Grossi et al., Paper V 2010A&A...518L..52G 2010A&A...518L..52G
Baes et al., Paper VI 2010A&A...518L..53B 2010A&A...518L..53B
de Looze et al., Paper VII 2010A&A...518L..54D 2010A&A...518L..54D
Davies et al., Paper VIII 2012MNRAS.419.3505D 2012MNRAS.419.3505D, J/MNRAS/419/3505
Magrini et al., Paper IX 2011A&A...535A..13M 2011A&A...535A..13M
Corbelli et al., Paper X 2012A&A...542A..32C 2012A&A...542A..32C
Pappalardo et al., Paper XI 2012A&A...545A..75P 2012A&A...545A..75P
Auld et al., Paper XII 2013MNRAS.428.1880A 2013MNRAS.428.1880A, J/MNRAS/428/1880
di Serego Alighieri et al., Paper XIII 2013A&A...552A...8D 2013A&A...552A...8D, J/A+A/552/A8
De Looze et al., Paper XIV 2013MNRAS.436.1057D 2013MNRAS.436.1057D
Baes et al., Paper XV 2014A&A...562A.106B 2014A&A...562A.106B, J/A+A/562/A106
Davies et al. Paper XVI 2014MNRAS.438.1922D 2014MNRAS.438.1922D
Pappalardo et al., Paper XVII 2015A&A...573A.129P 2015A&A...573A.129P, J/A+A/573/A129
Grossi et al. Paper XVIII 2015A&A...574A.126G 2015A&A...574A.126G, J/A+A/574/A126
Pappalardo et al., Paper XIX 2016A&A...589A..11P 2016A&A...589A..11P
(End) Simone Bianchi [INAF-OAA, Italy], Patricia Vannier [CDS] 20-Oct-2016