Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7
We present the selection, spectroscopic identification, and physical properties of extreme emission-line galaxies (EELGs) at 3
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| Veröffentlicht in: | The Astrophysical journal 2020-12, Vol.904 (2), p.180 |
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| creator | Onodera, Masato Shimakawa, Rhythm Suzuki, Tomoko L. Tanaka, Ichi Harikane, Yuichi Hayashi, Masao Kodama, Tadayuki Koyama, Yusei Nakajima, Kimihiko Shibuya, Takatoshi |
| description | We present the selection, spectroscopic identification, and physical properties of extreme emission-line galaxies (EELGs) at 3 |
| doi_str_mv | 10.3847/1538-4357/abc174 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_2467864042</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2467864042</sourcerecordid><originalsourceid>FETCH-LOGICAL-c379t-ed3edfa9a1bb4c655d1ab55afc39b3ade47abd46e2455867e4e70ad80ae94fe53</originalsourceid><addsrcrecordid>eNo9kFFLwzAQx4MoOKfvPgZ8tVu6JE0LvqjMORg4mIJv4ZpcsaNratLB5lfwS9ta8eG4u__97w5-hFzHbMJToaax5GkkuFRTyE2sxAkZ_UunZMQYE1HC1fs5uQhh27ezLBuR7wfvwOZQW7rBCk1buvqWbpqu8i4Y15SGLi3WbVmUBoZpb15_HEMnVHTtXYO-LTFQV1Cga9fsq19j388Prccd0vmuDKHToqqskS6ggkO_AS3l9I5-dcEn6pKcFVAFvPrLY_L2NH99fI5WL4vl4_0qMlxlbYSWoy0ggzjPhUmktDHkUkJheJZzsCgU5FYkOBNSpolCgYqBTRlgJgqUfExuhruNd597DK3eur2vu5d6JhKVJqKD07nY4DIdiOCx0I0vd-CPOma6R657vrrnqwfk_AcpAHY9</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2467864042</pqid></control><display><type>article</type><title>Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7</title><source>IOP Publishing Free Content</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><source>Alma/SFX Local Collection</source><creator>Onodera, Masato ; Shimakawa, Rhythm ; Suzuki, Tomoko L. ; Tanaka, Ichi ; Harikane, Yuichi ; Hayashi, Masao ; Kodama, Tadayuki ; Koyama, Yusei ; Nakajima, Kimihiko ; Shibuya, Takatoshi</creator><creatorcontrib>Onodera, Masato ; Shimakawa, Rhythm ; Suzuki, Tomoko L. ; Tanaka, Ichi ; Harikane, Yuichi ; Hayashi, Masao ; Kodama, Tadayuki ; Koyama, Yusei ; Nakajima, Kimihiko ; Shibuya, Takatoshi</creatorcontrib><description>We present the selection, spectroscopic identification, and physical properties of extreme emission-line galaxies (EELGs) at 3 <
z
< 3.7, aiming at studying physical properties of an analog population of star-forming galaxies (SFGs) at the epoch of reionization. The sample is selected based on the excess in the observed
Ks
broadband flux relative to the best-fit stellar continuum model flux. By applying a 0.3 mag excess as a primary criterion, we select 240 EELG candidates with intense emission lines and estimated an observed-frame equivalent width (EW) of ≳1000 Å over the UltraVISTA-DR2 ultra-deep stripe in the COSMOS field. We then carried out
HK
-band follow-up spectroscopy for 23 of the candidates with Subaru/MOIRCS, and we find that 19 and 2 of them are at
z
> 3 with intense [O
iii
] emission and H
α
emitters at
z
≃ 2, respectively. These spectroscopically identified EELGs at
z
≃ 3.3 show, on average, higher specific star formation rates (sSFRs) than the star-forming main sequence, low dust attenuation of
E
(
B
−
V
) ≲ 0.1 mag, and high [O
iii
]/[O
ii
]ratios of ≳3. We also find that our EELGs at
z
≃ 3.3 have higher hydrogen-ionizing photon production efficiencies (
ξ
ion
) than the canonical value (≃10
25.2
erg
−1
Hz), indicating that they are efficient in ionizing their surrounding interstellar medium. These physical properties suggest that they are low-metallicity galaxies with higher ionizing parameters and harder UV spectra than normal SFGs, which is similar to galaxies with Lyman continuum (LyC) leakage. Among our EELGs, those with the largest [O
iii
]/[O
ii
] and EW([O
iii
]) values would be the most promising candidates to search for LyC leakage.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/abc174</identifier><language>eng</language><publisher>Philadelphia: IOP Publishing</publisher><subject>Astrophysics ; Attenuation ; Broadband ; Continuum modeling ; Cosmic dust ; Emission analysis ; Emission lines ; Emitters ; Galaxies ; H alpha line ; Hydrogen ; Interstellar matter ; Interstellar medium ; Ionization ; Leakage ; Metallicity ; Physical properties ; Spectroscopy ; Spectrum analysis ; Star & galaxy formation ; Star formation ; Stars ; Stars & galaxies ; Stellar models</subject><ispartof>The Astrophysical journal, 2020-12, Vol.904 (2), p.180</ispartof><rights>Copyright IOP Publishing Dec 01, 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c379t-ed3edfa9a1bb4c655d1ab55afc39b3ade47abd46e2455867e4e70ad80ae94fe53</citedby><cites>FETCH-LOGICAL-c379t-ed3edfa9a1bb4c655d1ab55afc39b3ade47abd46e2455867e4e70ad80ae94fe53</cites><orcidid>0000-0002-2993-1576 ; 0000-0002-0479-3699 ; 0000-0002-4937-4738 ; 0000-0003-2965-5070 ; 0000-0003-3228-7264 ; 0000-0002-9321-7406 ; 0000-0002-3560-1346 ; 0000-0002-6047-430X ; 0000-0003-4442-2750</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Onodera, Masato</creatorcontrib><creatorcontrib>Shimakawa, Rhythm</creatorcontrib><creatorcontrib>Suzuki, Tomoko L.</creatorcontrib><creatorcontrib>Tanaka, Ichi</creatorcontrib><creatorcontrib>Harikane, Yuichi</creatorcontrib><creatorcontrib>Hayashi, Masao</creatorcontrib><creatorcontrib>Kodama, Tadayuki</creatorcontrib><creatorcontrib>Koyama, Yusei</creatorcontrib><creatorcontrib>Nakajima, Kimihiko</creatorcontrib><creatorcontrib>Shibuya, Takatoshi</creatorcontrib><title>Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7</title><title>The Astrophysical journal</title><description>We present the selection, spectroscopic identification, and physical properties of extreme emission-line galaxies (EELGs) at 3 <
z
< 3.7, aiming at studying physical properties of an analog population of star-forming galaxies (SFGs) at the epoch of reionization. The sample is selected based on the excess in the observed
Ks
broadband flux relative to the best-fit stellar continuum model flux. By applying a 0.3 mag excess as a primary criterion, we select 240 EELG candidates with intense emission lines and estimated an observed-frame equivalent width (EW) of ≳1000 Å over the UltraVISTA-DR2 ultra-deep stripe in the COSMOS field. We then carried out
HK
-band follow-up spectroscopy for 23 of the candidates with Subaru/MOIRCS, and we find that 19 and 2 of them are at
z
> 3 with intense [O
iii
] emission and H
α
emitters at
z
≃ 2, respectively. These spectroscopically identified EELGs at
z
≃ 3.3 show, on average, higher specific star formation rates (sSFRs) than the star-forming main sequence, low dust attenuation of
E
(
B
−
V
) ≲ 0.1 mag, and high [O
iii
]/[O
ii
]ratios of ≳3. We also find that our EELGs at
z
≃ 3.3 have higher hydrogen-ionizing photon production efficiencies (
ξ
ion
) than the canonical value (≃10
25.2
erg
−1
Hz), indicating that they are efficient in ionizing their surrounding interstellar medium. These physical properties suggest that they are low-metallicity galaxies with higher ionizing parameters and harder UV spectra than normal SFGs, which is similar to galaxies with Lyman continuum (LyC) leakage. Among our EELGs, those with the largest [O
iii
]/[O
ii
] and EW([O
iii
]) values would be the most promising candidates to search for LyC leakage.</description><subject>Astrophysics</subject><subject>Attenuation</subject><subject>Broadband</subject><subject>Continuum modeling</subject><subject>Cosmic dust</subject><subject>Emission analysis</subject><subject>Emission lines</subject><subject>Emitters</subject><subject>Galaxies</subject><subject>H alpha line</subject><subject>Hydrogen</subject><subject>Interstellar matter</subject><subject>Interstellar medium</subject><subject>Ionization</subject><subject>Leakage</subject><subject>Metallicity</subject><subject>Physical properties</subject><subject>Spectroscopy</subject><subject>Spectrum analysis</subject><subject>Star & galaxy formation</subject><subject>Star formation</subject><subject>Stars</subject><subject>Stars & galaxies</subject><subject>Stellar models</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNo9kFFLwzAQx4MoOKfvPgZ8tVu6JE0LvqjMORg4mIJv4ZpcsaNratLB5lfwS9ta8eG4u__97w5-hFzHbMJToaax5GkkuFRTyE2sxAkZ_UunZMQYE1HC1fs5uQhh27ezLBuR7wfvwOZQW7rBCk1buvqWbpqu8i4Y15SGLi3WbVmUBoZpb15_HEMnVHTtXYO-LTFQV1Cga9fsq19j388Prccd0vmuDKHToqqskS6ggkO_AS3l9I5-dcEn6pKcFVAFvPrLY_L2NH99fI5WL4vl4_0qMlxlbYSWoy0ggzjPhUmktDHkUkJheJZzsCgU5FYkOBNSpolCgYqBTRlgJgqUfExuhruNd597DK3eur2vu5d6JhKVJqKD07nY4DIdiOCx0I0vd-CPOma6R657vrrnqwfk_AcpAHY9</recordid><startdate>20201201</startdate><enddate>20201201</enddate><creator>Onodera, Masato</creator><creator>Shimakawa, Rhythm</creator><creator>Suzuki, Tomoko L.</creator><creator>Tanaka, Ichi</creator><creator>Harikane, Yuichi</creator><creator>Hayashi, Masao</creator><creator>Kodama, Tadayuki</creator><creator>Koyama, Yusei</creator><creator>Nakajima, Kimihiko</creator><creator>Shibuya, Takatoshi</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-2993-1576</orcidid><orcidid>https://orcid.org/0000-0002-0479-3699</orcidid><orcidid>https://orcid.org/0000-0002-4937-4738</orcidid><orcidid>https://orcid.org/0000-0003-2965-5070</orcidid><orcidid>https://orcid.org/0000-0003-3228-7264</orcidid><orcidid>https://orcid.org/0000-0002-9321-7406</orcidid><orcidid>https://orcid.org/0000-0002-3560-1346</orcidid><orcidid>https://orcid.org/0000-0002-6047-430X</orcidid><orcidid>https://orcid.org/0000-0003-4442-2750</orcidid></search><sort><creationdate>20201201</creationdate><title>Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7</title><author>Onodera, Masato ; Shimakawa, Rhythm ; Suzuki, Tomoko L. ; Tanaka, Ichi ; Harikane, Yuichi ; Hayashi, Masao ; Kodama, Tadayuki ; Koyama, Yusei ; Nakajima, Kimihiko ; Shibuya, Takatoshi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c379t-ed3edfa9a1bb4c655d1ab55afc39b3ade47abd46e2455867e4e70ad80ae94fe53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Astrophysics</topic><topic>Attenuation</topic><topic>Broadband</topic><topic>Continuum modeling</topic><topic>Cosmic dust</topic><topic>Emission analysis</topic><topic>Emission lines</topic><topic>Emitters</topic><topic>Galaxies</topic><topic>H alpha line</topic><topic>Hydrogen</topic><topic>Interstellar matter</topic><topic>Interstellar medium</topic><topic>Ionization</topic><topic>Leakage</topic><topic>Metallicity</topic><topic>Physical properties</topic><topic>Spectroscopy</topic><topic>Spectrum analysis</topic><topic>Star & galaxy formation</topic><topic>Star formation</topic><topic>Stars</topic><topic>Stars & galaxies</topic><topic>Stellar models</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Onodera, Masato</creatorcontrib><creatorcontrib>Shimakawa, Rhythm</creatorcontrib><creatorcontrib>Suzuki, Tomoko L.</creatorcontrib><creatorcontrib>Tanaka, Ichi</creatorcontrib><creatorcontrib>Harikane, Yuichi</creatorcontrib><creatorcontrib>Hayashi, Masao</creatorcontrib><creatorcontrib>Kodama, Tadayuki</creatorcontrib><creatorcontrib>Koyama, Yusei</creatorcontrib><creatorcontrib>Nakajima, Kimihiko</creatorcontrib><creatorcontrib>Shibuya, Takatoshi</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Onodera, Masato</au><au>Shimakawa, Rhythm</au><au>Suzuki, Tomoko L.</au><au>Tanaka, Ichi</au><au>Harikane, Yuichi</au><au>Hayashi, Masao</au><au>Kodama, Tadayuki</au><au>Koyama, Yusei</au><au>Nakajima, Kimihiko</au><au>Shibuya, Takatoshi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7</atitle><jtitle>The Astrophysical journal</jtitle><date>2020-12-01</date><risdate>2020</risdate><volume>904</volume><issue>2</issue><spage>180</spage><pages>180-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>We present the selection, spectroscopic identification, and physical properties of extreme emission-line galaxies (EELGs) at 3 <
z
< 3.7, aiming at studying physical properties of an analog population of star-forming galaxies (SFGs) at the epoch of reionization. The sample is selected based on the excess in the observed
Ks
broadband flux relative to the best-fit stellar continuum model flux. By applying a 0.3 mag excess as a primary criterion, we select 240 EELG candidates with intense emission lines and estimated an observed-frame equivalent width (EW) of ≳1000 Å over the UltraVISTA-DR2 ultra-deep stripe in the COSMOS field. We then carried out
HK
-band follow-up spectroscopy for 23 of the candidates with Subaru/MOIRCS, and we find that 19 and 2 of them are at
z
> 3 with intense [O
iii
] emission and H
α
emitters at
z
≃ 2, respectively. These spectroscopically identified EELGs at
z
≃ 3.3 show, on average, higher specific star formation rates (sSFRs) than the star-forming main sequence, low dust attenuation of
E
(
B
−
V
) ≲ 0.1 mag, and high [O
iii
]/[O
ii
]ratios of ≳3. We also find that our EELGs at
z
≃ 3.3 have higher hydrogen-ionizing photon production efficiencies (
ξ
ion
) than the canonical value (≃10
25.2
erg
−1
Hz), indicating that they are efficient in ionizing their surrounding interstellar medium. These physical properties suggest that they are low-metallicity galaxies with higher ionizing parameters and harder UV spectra than normal SFGs, which is similar to galaxies with Lyman continuum (LyC) leakage. Among our EELGs, those with the largest [O
iii
]/[O
ii
] and EW([O
iii
]) values would be the most promising candidates to search for LyC leakage.</abstract><cop>Philadelphia</cop><pub>IOP Publishing</pub><doi>10.3847/1538-4357/abc174</doi><orcidid>https://orcid.org/0000-0002-2993-1576</orcidid><orcidid>https://orcid.org/0000-0002-0479-3699</orcidid><orcidid>https://orcid.org/0000-0002-4937-4738</orcidid><orcidid>https://orcid.org/0000-0003-2965-5070</orcidid><orcidid>https://orcid.org/0000-0003-3228-7264</orcidid><orcidid>https://orcid.org/0000-0002-9321-7406</orcidid><orcidid>https://orcid.org/0000-0002-3560-1346</orcidid><orcidid>https://orcid.org/0000-0002-6047-430X</orcidid><orcidid>https://orcid.org/0000-0003-4442-2750</orcidid><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | IOP Publishing Free Content; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Astrophysics Attenuation Broadband Continuum modeling Cosmic dust Emission analysis Emission lines Emitters Galaxies H alpha line Hydrogen Interstellar matter Interstellar medium Ionization Leakage Metallicity Physical properties Spectroscopy Spectrum analysis Star & galaxy formation Star formation Stars Stars & galaxies Stellar models |
| title | Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7 |
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