Powering reionization: assessing the galaxy ionizing photon budget at z < 10
We present a new analysis of the ionizing emissivity ( $\dot{N}_{\rm {ion}}$ , s−1 Mpc−3) for galaxies during the epoch of reionization and their potential for completing and maintaining reionization. We use extensive spectral energy distribution modelling – incorporating two plausible mechanisms fo...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2015-08, Vol.451 (2), p.2030-2049 |
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| container_issue | 2 |
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| container_title | Monthly notices of the Royal Astronomical Society |
| container_volume | 451 |
| creator | Duncan, Kenneth Conselice, Christopher J. |
| description | We present a new analysis of the ionizing emissivity (
$\dot{N}_{\rm {ion}}$
, s−1 Mpc−3) for galaxies during the epoch of reionization and their potential for completing and maintaining reionization. We use extensive spectral energy distribution modelling – incorporating two plausible mechanisms for the escape of Lyman continuum photon – to explore the range and evolution of ionizing efficiencies consistent with new results on galaxy colours (β) during this epoch. We estimate
$\dot{N}_{\rm {ion}}$
for the latest observations of the luminosity and star formation rate density at z |
| doi_str_mv | 10.1093/mnras/stv1049 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_TOX</sourceid><recordid>TN_cdi_proquest_miscellaneous_1718939083</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><oup_id>10.1093/mnras/stv1049</oup_id><sourcerecordid>1718939083</sourcerecordid><originalsourceid>FETCH-LOGICAL-c469t-118dd8260ea4eced493d0015eb4866df0e19cdb5cad165b50732fa60073e6fb93</originalsourceid><addsrcrecordid>eNqNkctKw0AUhgdRsFaX7gNu3MSek5lMMuJGxBsUdaHrYZJM2pQ2E2cmavs0fZY-mekFBDe6-uDn41z4CTlFuEAQdDCrrXID5z8QmNgjPaQ8DiPB-T7pAdA4TBPEQ3Lk3AQAGI14jzy9mE9tq3oUWF2Zuloo3-EyUM5p59a5H-tgpKbqax5shHXWjI03dZC1xUj7QPlgsVperZYIx-SgVFOnT3bsk7e729ebh3D4fP94cz0Mc8aFDxHTokgjDloxneuCCVoAYKwzlnJelKBR5EUW56pAHmcxJDQqFYeOmpeZoH1yvp3bWPPeauflrHK5nk5VrU3rJCaYCiogpf9Qu8VAozjt1LNf6sS0tu4ekcgFSyLGKHRWuLVya5yzupSNrWbKziWCXBchN0XIXRE_B5i2-UP9Bm0Yi_8</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1694724430</pqid></control><display><type>article</type><title>Powering reionization: assessing the galaxy ionizing photon budget at z < 10</title><source>Access via Oxford University Press (Open Access Collection)</source><creator>Duncan, Kenneth ; Conselice, Christopher J.</creator><creatorcontrib>Duncan, Kenneth ; Conselice, Christopher J.</creatorcontrib><description>We present a new analysis of the ionizing emissivity (
$\dot{N}_{\rm {ion}}$
, s−1 Mpc−3) for galaxies during the epoch of reionization and their potential for completing and maintaining reionization. We use extensive spectral energy distribution modelling – incorporating two plausible mechanisms for the escape of Lyman continuum photon – to explore the range and evolution of ionizing efficiencies consistent with new results on galaxy colours (β) during this epoch. We estimate
$\dot{N}_{\rm {ion}}$
for the latest observations of the luminosity and star formation rate density at z < 10, outlining the range of emissivity histories consistent with our new model. Given the growing observational evidence for a UV colour–magnitude relation in high-redshift galaxies, we find that for any plausible evolution in galaxy properties, red (brighter) galaxies are less efficient at producing ionizing photons than their blue (fainter) counterparts. The assumption of a redshift and luminosity evolution in β leads to two important conclusions. First, the ionizing efficiency of galaxies naturally increases with redshift. Secondly, for a luminosity-dependent ionizing efficiency, we find that galaxies down to a rest-frame magnitude of M
UV ≈ −15 alone can potentially produce sufficient numbers of ionizing photons to maintain reionization as early as z ∼ 8 for a clumping factor of
$C_{\rm H\,\small {II}} \le 3$
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$\dot{N}_{\rm {ion}}$
, s−1 Mpc−3) for galaxies during the epoch of reionization and their potential for completing and maintaining reionization. We use extensive spectral energy distribution modelling – incorporating two plausible mechanisms for the escape of Lyman continuum photon – to explore the range and evolution of ionizing efficiencies consistent with new results on galaxy colours (β) during this epoch. We estimate
$\dot{N}_{\rm {ion}}$
for the latest observations of the luminosity and star formation rate density at z < 10, outlining the range of emissivity histories consistent with our new model. Given the growing observational evidence for a UV colour–magnitude relation in high-redshift galaxies, we find that for any plausible evolution in galaxy properties, red (brighter) galaxies are less efficient at producing ionizing photons than their blue (fainter) counterparts. The assumption of a redshift and luminosity evolution in β leads to two important conclusions. First, the ionizing efficiency of galaxies naturally increases with redshift. Secondly, for a luminosity-dependent ionizing efficiency, we find that galaxies down to a rest-frame magnitude of M
UV ≈ −15 alone can potentially produce sufficient numbers of ionizing photons to maintain reionization as early as z ∼ 8 for a clumping factor of
$C_{\rm H\,\small {II}} \le 3$
.</description><subject>Astronomy</subject><subject>Atoms & subatomic particles</subject><subject>Density</subject><subject>Emissivity</subject><subject>Evolution</subject><subject>Ions</subject><subject>Luminosity</subject><subject>Photons</subject><subject>Red shift</subject><subject>Spectral energy distribution</subject><subject>Star & galaxy formation</subject><subject>Symbols</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqNkctKw0AUhgdRsFaX7gNu3MSek5lMMuJGxBsUdaHrYZJM2pQ2E2cmavs0fZY-mekFBDe6-uDn41z4CTlFuEAQdDCrrXID5z8QmNgjPaQ8DiPB-T7pAdA4TBPEQ3Lk3AQAGI14jzy9mE9tq3oUWF2Zuloo3-EyUM5p59a5H-tgpKbqax5shHXWjI03dZC1xUj7QPlgsVperZYIx-SgVFOnT3bsk7e729ebh3D4fP94cz0Mc8aFDxHTokgjDloxneuCCVoAYKwzlnJelKBR5EUW56pAHmcxJDQqFYeOmpeZoH1yvp3bWPPeauflrHK5nk5VrU3rJCaYCiogpf9Qu8VAozjt1LNf6sS0tu4ekcgFSyLGKHRWuLVya5yzupSNrWbKziWCXBchN0XIXRE_B5i2-UP9Bm0Yi_8</recordid><startdate>20150801</startdate><enddate>20150801</enddate><creator>Duncan, Kenneth</creator><creator>Conselice, Christopher J.</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20150801</creationdate><title>Powering reionization: assessing the galaxy ionizing photon budget at z < 10</title><author>Duncan, Kenneth ; Conselice, Christopher J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c469t-118dd8260ea4eced493d0015eb4866df0e19cdb5cad165b50732fa60073e6fb93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Astronomy</topic><topic>Atoms & subatomic particles</topic><topic>Density</topic><topic>Emissivity</topic><topic>Evolution</topic><topic>Ions</topic><topic>Luminosity</topic><topic>Photons</topic><topic>Red shift</topic><topic>Spectral energy distribution</topic><topic>Star & galaxy formation</topic><topic>Symbols</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Duncan, Kenneth</creatorcontrib><creatorcontrib>Conselice, Christopher J.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Duncan, Kenneth</au><au>Conselice, Christopher J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Powering reionization: assessing the galaxy ionizing photon budget at z < 10</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Mon. Not. R. Astron. Soc</stitle><date>2015-08-01</date><risdate>2015</risdate><volume>451</volume><issue>2</issue><spage>2030</spage><epage>2049</epage><pages>2030-2049</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>We present a new analysis of the ionizing emissivity (
$\dot{N}_{\rm {ion}}$
, s−1 Mpc−3) for galaxies during the epoch of reionization and their potential for completing and maintaining reionization. We use extensive spectral energy distribution modelling – incorporating two plausible mechanisms for the escape of Lyman continuum photon – to explore the range and evolution of ionizing efficiencies consistent with new results on galaxy colours (β) during this epoch. We estimate
$\dot{N}_{\rm {ion}}$
for the latest observations of the luminosity and star formation rate density at z < 10, outlining the range of emissivity histories consistent with our new model. Given the growing observational evidence for a UV colour–magnitude relation in high-redshift galaxies, we find that for any plausible evolution in galaxy properties, red (brighter) galaxies are less efficient at producing ionizing photons than their blue (fainter) counterparts. The assumption of a redshift and luminosity evolution in β leads to two important conclusions. First, the ionizing efficiency of galaxies naturally increases with redshift. Secondly, for a luminosity-dependent ionizing efficiency, we find that galaxies down to a rest-frame magnitude of M
UV ≈ −15 alone can potentially produce sufficient numbers of ionizing photons to maintain reionization as early as z ∼ 8 for a clumping factor of
$C_{\rm H\,\small {II}} \le 3$
.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stv1049</doi><tpages>20</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Access via Oxford University Press (Open Access Collection) |
| subjects | Astronomy Atoms & subatomic particles Density Emissivity Evolution Ions Luminosity Photons Red shift Spectral energy distribution Star & galaxy formation Symbols |
| title | Powering reionization: assessing the galaxy ionizing photon budget at z < 10 |
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