NDLI: Why are some brightest cluster galaxies forming stars?

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Why are some brightest cluster galaxies forming stars?

Content Provider	Scilit
Author	O'Dea, Christopher P. Quillen, Alice Zufelt, Nicholas Park, Jaehong Edge, Alastair Russell, Helen Fabian, Andy Baum, Stefi
Copyright Year	2007
Description	We present first results from an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies with optical line emission located in the cores of X-ray luminous clusters selected from the ROSAT All-Sky Survey. We find that 1/3 of these sources have signs of excess infrared emission; 22 objects of 62 are detected at 70 μm and 19 have 8 to 5.8 μm flux ratios above 0.98. The strength of the excess emission correlates with the luminosity of the optical emission lines. Excluding the four systems dominated by an AGN, the excess mid-infrared emission in the remaining brightest cluster galaxies is likely powered by star formation. We find a correlation between mass deposition rate from a cooling flow model for the X-ray emission and the star formation rate estimated from the infrared luminosity. The star formation rates are 1/10 to 1/100 of the mass deposition rates expected in the absence of heating suggesting that the re-heating of the ICM is generally very effective in reducing the amount of mass cooling from the hot phase.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/7C696C2D2CA549BC67988B1A9D22F6A7/S1743921308017602a.pdf/div-class-title-why-are-some-brightest-cluster-galaxies-forming-stars-div.pdf
Ending Page	188
Page Count	4
Starting Page	185
ISSN	17439213
e-ISSN	17439221
DOI	10.1017/s1743921308017602
Journal	Proceedings of the International Astronomical Union
Issue Number	S245
Volume Number	3
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	2007-07-01
Access Restriction	Open
Subject Keyword	Proceedings of the International Astronomical Union Astronomy and Astrophysics Elliptical and Lenticular Galaxies
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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