NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-17 T04:05:21 PDT
Help | Comment | NED Home

For refcode 1995ApJS...99..405C:
Retrieve 163 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1995ApJS...99..405C FAR-INFRARED EMISSION FROM ABELL CLUSTERS CAROLINE V. COX AND JOEL N. BREGMAN Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090 cvcox@astro.lsa.umich.edu, jbregman@astro.lsa.umich.edu AND JAMES M. SCHOMBERT IPAC, JPL, Caltech; and NASA Headquarters, Astrophysics Division Code SZ, Washington, DC 20546-0001 js@abyss.jpl.hq.nasa.gov Received 1994 October 24; accepted 1995 January 11 ABSTRACT We have examined the frequency with which central dominant galaxies are sources of far-infrared emission in a complete sample of clusters of galaxies. Previous searches for far-infrared emission (FIR; IRAS 60 and 100 micron measurements) from dominant cluster galaxies (Bregman, McNamara, & O'Connell 1990; Grabelsky & Ulmer 1990) using small, inhomogeneous samples have found 20%-50% of clusters to have significant FIR emission. In a new study, we analyzed the 60 and 100 micron emission properties of cD galaxies in a complete sample of 163 Abell Clusters. For comparison, a control sample of 207 blank fields was analyzed to determine the distribution of spurious detections, which is greater than expected from Gaussian statistics. The contribution of Galactic cirrus at 60 and 100 microns to non-Gaussian noise is clearly demonstrated by the correspondence of a 98% confidence level to a signal to noise of 4 or 4.5 rather than to a signal-to-noise ratio of 2 as expected from Gaussian statistics. After correcting for contaminated fields and spurious detections, we find that ~10% of cD galaxies in rich clusters are sources of FIR emission: This rate is lower than that quoted in previous studies, which we attribute to our correction for spurious sources, and to the differences in sample selection and average redshift between our study and previous work. Typical detected cDs have FIR luminosities of ~3 x 10^44^ ergs s^-1^, which is comparable to the blue luminosities from these objects and an order of magnitude greater than the X-ray luminosities produced in the cores of clusters. Dust masses derived from the 60 and 100 micron fluxes are ~10^7^ M_sun_. Because only ~10% of the clusters have high FIR luminosities, such strong emission is probably a transient state for an individual cluster. Subject headings: galaxies: clusters: general - galaxies: elliptical and lenticular, cD - infrared: galaxies - intergalactic medium
Retrieve 163 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home