NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T15:11:55 PDT
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For refcode 2000A&A...359..865S:
Retrieve 123 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&A...359..865S The ISOPHOT 1705m serendipity survey. I. Compact sources with galaxy associations. STICKEL M., LEMKE D., KLAAS U., BEICHMAN C.A., ROWAN-ROBINSON M., EFSTATHIOU A., BOGUN S., KESSLER M.F., RICHTER G. Received 16 February 2000/Accepted 9 May 2000 Abstract: The first set of compact sources observed in the ISOPHOT 170 micron Serendipity Survey is presented. From the slew data with low (I_100_ micron <= 15 MJy/sr) cirrus background, 115 well-observed sources with a high signal-to-noise ratio in all detector pixels having a galaxy association were extracted. Of the galaxies with known optical morphologies, the vast majority are classified as spirals, barred spirals, or irregulars. The 170 micron fluxes measured from the Serendipity slews have been put on an absolute flux level by using calibration sources observed additionally with the photometric mapping mode of ISOPHOT. For all but a few galaxies, the 170 micron fluxes are determined for the first time, which represents a significant increase in the number of galaxies with measured Far-Infrared (FIR) fluxes beyond the IRAS 100 micron limit. The 170 micron fluxes cover the range 2<~F_170 micron_ <~ 100Jy. Formulae for the integrated FIR fluxes F_40-220 microns_ and the total infrared fluxes F_1-1000 micron_ incorporating the new 170 micron fluxes are provided. The large fraction of sources with a high F_170 micron_ / F_100 micron_ flux ratio indicates that a cold (T_Dust_ <~ 20K) dust component is present in many galaxies. The detection of such a cold dust component is crucial for the determination of the total dust mass in galaxies, and, in cases with a large F_170 micron_/F_100 micron_ flux ratio, increases the dust mass by a significant factor. The typical mass of the coldest dust component is M_Dust_ = 10^7.5+/-0.5^ M_sun_, a factor 2-10 larger than that derived from IRAS fluxes alone. As a consequence, the majority of the derived gas-to-dust ratios are much closer to the canonical value of =~160 for the Milky Way. By relaxing the selection criteria, it is expected that the Serendipity Survey will eventually lead to a catalog of 170 micron fluxes for =~1000 galaxies. Key words: methods: data analysis - catalogs - surveys - galaxies: ISM - infrared: galaxies
Retrieve 123 NED objects in this reference.
Please click here for ADS abstract

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