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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 94 5 List of fits images fits/* 0 5 Individual fits images
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
Bytes Format Units Label Explanations
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
Acknowledgements: Simone Bianchi, sbianchi(at) References: Davies et al., Paper I 2010A&A...518L..48D Cortese et al., Paper II 2010A&A...518L..49C Clemens et al., Paper III 2010A&A...518L..50C Smith et al., Paper IV 2010A&A...518L..51S Grossi et al., Paper V 2010A&A...518L..52G Baes et al., Paper VI 2010A&A...518L..53B de Looze et al., Paper VII 2010A&A...518L..54D Davies et al., Paper VIII 2012MNRAS.419.3505D, J/MNRAS/419/3505 Magrini et al., Paper IX 2011A&A...535A..13M Corbelli et al., Paper X 2012A&A...542A..32C Pappalardo et al., Paper XI 2012A&A...545A..75P Auld et al., Paper XII 2013MNRAS.428.1880A, J/MNRAS/428/1880 di Serego Alighieri et al., Paper XIII 2013A&A...552A...8D, J/A+A/552/A8 De Looze et al., Paper XIV 2013MNRAS.436.1057D Baes et al., Paper XV 2014A&A...562A.106B, J/A+A/562/A106 Davies et al. Paper XVI 2014MNRAS.438.1922D Pappalardo et al., Paper XVII 2015A&A...573A.129P, J/A+A/573/A129 Grossi et al. Paper XVIII 2015A&A...574A.126G, J/A+A/574/A126 Pappalardo et al., Paper XIX 2016A&A...589A..11P
(End) Simone Bianchi [INAF-OAA, Italy], Patricia Vannier [CDS] 20-Oct-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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