Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...466..831s&link_type=abstract
Astronomy and Astrophysics, Volume 466, Issue 3, May II 2007, pp.831-838
Astronomy and Astrophysics
Astrophysics
6
Surveys, Infrared: Galaxies, Infrared: General, Galaxies: Ism
Scientific paper
Aims: To shed more light on the integrated FIR properties of galaxies, the ≈2000 compact sources in the ISOPHOT Serendipity Survey associated with identified galaxies are investigated statistically. They provide the only sample large enough to determine the FIR properties such as dust temperatures and masses, FIR luminosities, and HI-to-dust ratios not only for the group as a whole, but also divided into several subgroups of different Hubble types. Only with this catalog, the high flux end of the 170 {μm} galaxy number counts can be established, which is crucial as a complement to the much deeper ISOPHOT studies at this wavelength in much smaller sky areas. Methods: The differential distributions of integrated FIR properties and the cumulative number counts are analysed. Results: The galaxy list of the ISOPHOT Serendipity Survey has a 170 {μm} completeness limit of ≈2 Jy. The statistical analysis confirmed that the {F170 {μm}} / {F100 {μm}} flux ratios peak at ≈1, corresponding to a dust color temperature of ≈20 K. FIR luminosities and dust masses cover a large range with peaks near L{_1-1000 ≈ 1010.5 ± 1 L&sun;} and M{_Dust ≈ 107.5 ± 0.5 M&sun;}, respectively. HI-to-dust ratios range from ≈10 and ≈10^4, rendering the notion of fiducial HI-to-dust ratio for conversion between gas and dust masses almost useless. The latest models of the cumulative 170 {μm} number counts are in reasonable agreement with the deep as well as the shallow surveys from ISO up to fluxes of ≈50 Jy.
Based on observations with ISO, an ESA project with instruments
funded by ESA Member States (especially the PI countries: France,
Germany, The Netherlands, and the UK) and with the
participation of ISAS and NASA. Members of the Consortium on the
ISOPHOT Serendipity Survey (CISS) are MPIA Heidelberg, ESA ISO SOC
Villafranca, AIP Potsdam, IPAC Pasadena, Imperial College London.
Klaas Ulrich
Lemke Deitrich
Stickel Manfred
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