Dust Grain Growth in the Interstellar Medium of Galaxies at Redshifts 4 6.5

Michal J. Michalowski, Eric J. Murphy, Jens Hjorth, Darach Watson, Christa Gall, James S. Dunlop

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

To discriminate between different dust formation processes is a key issue in order to understand its properties. We analysed six submillimeter galaxies at redshifts 4 < z < 5 and nine quasars at 5 < z < 6.4. We estimated their dust masses from their (sub)millimeter emission and their stellar masses from the spectral energy distribution modelling or from the dynamical and gas masses obtained from the CO line detections. We calculated the dust yields per AGB star and per SN required to explain these dust masses and concluded that AGB stars are not efficient enough to form dust in the majority of these galaxies. SN could be responsible for dust production, but only if dust destruction in the SN shocks is not taken into account. Otherwise even SNe are not efficient enough, which advocates for some other dust production mechanism. We present the hypothesis that grain growth in the interstellar medium is responsible for bulk of the dust mass accumulation in these galaxies.

Original languageEnglish
Title of host publicationGalaxy evolution: Infrared to millimeter wavelength perspective
Subtitle of host publicationProceedings of a conference held at Guilin, China 25-29 October 2010.
EditorsW Wang, JF Lu, Z Luo, ZQ Yang, H Hua, Z Chen
Place of PublicationSAN FRANCISCO
PublisherASTRONOMICAL SOC PACIFIC
Pages387-392
Number of pages6
Volume446
ISBN (Print)978-1-58381-772-8
Publication statusPublished - 2011
EventConference on the Galaxy Evolution: Infrared to Millimeter Wavelength Perspective - Guilin
Duration: 25 Oct 201029 Oct 2010

Conference

ConferenceConference on the Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
CityGuilin
Period25/10/1029/10/10

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