A far-infrared view of the Lockman hole from ISO 95-µm observations – II. Optical identifications and insights into the nature of the far-infrared sources
Identifieur interne : 000716 ( Main/Corpus ); précédent : 000715; suivant : 000717A far-infrared view of the Lockman hole from ISO 95-µm observations – II. Optical identifications and insights into the nature of the far-infrared sources
Auteurs : G. Rodighiero ; D. Fadda ; A. Franceschini ; C. LariSource :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2005-02-21.
English descriptors
Abstract
We present the optical identifications of a 95-μm ISOPHOT sample in the Lockman hole over an area of approximately half a deg2. The Rodighiero et al. catalogue includes 36 sources, making up a complete flux-limited sample for S95μm≥ 100 mJy. Reliable sources were detected, with decreasing but well-controlled completeness, down to S95μm≃ 20 mJy. We have combined mid-infrared (IR) and radio catalogues in this area to identify the potential optical counterparts of the far-IR sources. We found 14 radio and 13 15-μm associations, 10 of which have both associations. For the 11 sources with spectroscopic redshift, we have performed a spectrophotometric analysis of the observed spectral energy distributions (SEDs). Four of these 95-μm sources have been classified as faint IR (FIR) galaxies (LFIR < 1.e11 L⊙), six as luminous IR galaxies (LIRGs) and only one as an ultraluminous IR galaxy (ULIRG). We have discussed the redshift distribution of these objects, comparing our results with evolutionary model predictions 95 and 175 μm. Given their moderate distances (the bulk of the closest spectroscopically identified objects lying at z < 0.2), their luminosities and star formation rates (SFR; median value ∼ 10 M⊙ yr−1), the sources unveiled by ISOPHOT at 95 μm seem to correspond to the low redshift (z < 0.3) FIRBACK 175-μm population, composed of dusty, star-forming galaxies with moderate SFRs. We computed and compared different SFR estimators, and found that the SF derived from the bolometric IR luminosity is well correlated with that computed from the radio and mid-IR fluxes.
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DOI: 10.1111/j.1365-2966.2004.08547.x
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The Rodighiero et al. catalogue includes 36 sources, making up a complete flux-limited sample for S95μm≥ 100 mJy. Reliable sources were detected, with decreasing but well-controlled completeness, down to S95μm≃ 20 mJy. We have combined mid-infrared (IR) and radio catalogues in this area to identify the potential optical counterparts of the far-IR sources. We found 14 radio and 13 15-μm associations, 10 of which have both associations. For the 11 sources with spectroscopic redshift, we have performed a spectrophotometric analysis of the observed spectral energy distributions (SEDs). Four of these 95-μm sources have been classified as faint IR (FIR) galaxies (LFIR < 1.e11 L⊙), six as luminous IR galaxies (LIRGs) and only one as an ultraluminous IR galaxy (ULIRG). We have discussed the redshift distribution of these objects, comparing our results with evolutionary model predictions 95 and 175 μm. Given their moderate distances (the bulk of the closest spectroscopically identified objects lying at z < 0.2), their luminosities and star formation rates (SFR; median value ∼ 10 M⊙ yr−1), the sources unveiled by ISOPHOT at 95 μm seem to correspond to the low redshift (z < 0.3) FIRBACK 175-μm population, composed of dusty, star-forming galaxies with moderate SFRs. We computed and compared different SFR estimators, and found that the SF derived from the bolometric IR luminosity is well correlated with that computed from the radio and mid-IR fluxes.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>G. Rodighiero</name><affiliations><json:string>Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy</json:string><json:string>E-mail: rodighiero@pd.astro.it</json:string></affiliations></json:item><json:item><name>D. 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Optical identifications and insights into the nature of the far-infrared sources</title><author xml:id="author-1" corresp="yes"><persName><forename type="first">G.</forename><surname>Rodighiero</surname></persName><email>rodighiero@pd.astro.it</email><affiliation>Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy</affiliation></author><author xml:id="author-2"><persName><forename type="first">D.</forename><surname>Fadda</surname></persName><affiliation>Caltech, SIRTF Science Center, MC 220-6, Pasadena, CA 91126, USA</affiliation></author><author xml:id="author-3"><persName><forename type="first">A.</forename><surname>Franceschini</surname></persName><affiliation>Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy</affiliation></author><author xml:id="author-4"><persName><forename type="first">C.</forename><surname>Lari</surname></persName><affiliation>Istituto di Radioastronomia del CNR, via Gobetti 101, I-40129 Bologna, Italy</affiliation></author></analytic><monogr><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Mon. Not. R. Astron. Soc.</title><idno type="pISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2005-02-21"></date><biblScope unit="volume">357</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="449">449</biblScope><biblScope unit="page" to="460">460</biblScope></imprint></monogr><idno type="istex">4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2</idno><idno type="DOI">10.1111/j.1365-2966.2004.08547.x</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2005</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>We present the optical identifications of a 95-μm ISOPHOT sample in the Lockman hole over an area of approximately half a deg2. The Rodighiero et al. catalogue includes 36 sources, making up a complete flux-limited sample for S95μm≥ 100 mJy. Reliable sources were detected, with decreasing but well-controlled completeness, down to S95μm≃ 20 mJy. We have combined mid-infrared (IR) and radio catalogues in this area to identify the potential optical counterparts of the far-IR sources. We found 14 radio and 13 15-μm associations, 10 of which have both associations. For the 11 sources with spectroscopic redshift, we have performed a spectrophotometric analysis of the observed spectral energy distributions (SEDs). Four of these 95-μm sources have been classified as faint IR (FIR) galaxies (LFIR < 1.e11 L⊙), six as luminous IR galaxies (LIRGs) and only one as an ultraluminous IR galaxy (ULIRG). We have discussed the redshift distribution of these objects, comparing our results with evolutionary model predictions 95 and 175 μm. Given their moderate distances (the bulk of the closest spectroscopically identified objects lying at z < 0.2), their luminosities and star formation rates (SFR; median value ∼ 10 M⊙ yr−1), the sources unveiled by ISOPHOT at 95 μm seem to correspond to the low redshift (z < 0.3) FIRBACK 175-μm population, composed of dusty, star-forming galaxies with moderate SFRs. We computed and compared different SFR estimators, and found that the SF derived from the bolometric IR luminosity is well correlated with that computed from the radio and mid-IR fluxes.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>Keywords</head><item><term>galaxies: evolution</term></item><item><term>galaxies: fundamental parameters</term></item><item><term>infrared: galaxies</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2005-02-21">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article article-type="research-article"><front><journal-meta><journal-id journal-id-type="hwp">mnras</journal-id><journal-id journal-id-type="publisher-id">mnras</journal-id><journal-title>Monthly Notices of the Royal Astronomical Society</journal-title><abbrev-journal-title>Mon. Not. R. Astron. Soc.</abbrev-journal-title><issn pub-type="ppub">0035-8711</issn><issn pub-type="epub">1365-2966</issn><publisher><publisher-name>Blackwell Science Ltd</publisher-name><publisher-loc>Oxford, UK</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.1111/j.1365-2966.2004.08547.x</article-id><article-categories><subj-group subj-group-type="heading"><subject>Papers</subject></subj-group></article-categories><title-group><article-title>A far-infrared view of the Lockman hole from <italic>ISO</italic> 95-µm observations – II. Optical identifications and insights into the nature of the far-infrared sources</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Rodighiero</surname><given-names>G.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="corresp" rid="cor1"><sup>⋆</sup></xref></contrib><contrib contrib-type="author"><name><surname>Fadda</surname><given-names>D.</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Franceschini</surname><given-names>A.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Lari</surname><given-names>C.</given-names></name><xref ref-type="aff" rid="aff3"><sup>3</sup></xref></contrib><aff id="aff1"><label>1</label>Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy</aff><aff id="aff2"><label>2</label>Caltech, SIRTF Science Center, MC 220-6, Pasadena, CA 91126, USA</aff><aff id="aff3"><label>3</label>Istituto di Radioastronomia del CNR, via Gobetti 101, I-40129 Bologna, Italy</aff></contrib-group><author-notes><corresp id="cor1"><label>⋆</label>E-mail: <email>rodighiero@pd.astro.it</email></corresp></author-notes><pub-date pub-type="ppub"><day>21</day><month>2</month><year>2005</year></pub-date><volume>357</volume><issue>2</issue><fpage>449</fpage><lpage>460</lpage><history><date date-type="received"><day>21</day><month>10</month><year>2004</year></date><date date-type="accepted"><day>24</day><month>10</month><year>2004</year></date></history><permissions><copyright-statement>© 2005 RAS</copyright-statement><copyright-year>2005</copyright-year></permissions><abstract><title>Abstract</title><p>We present the optical identifications of a 95-μm ISOPHOT sample in the Lockman hole over an area of approximately half a deg<sup>2</sup>. The Rodighiero et al. catalogue includes 36 sources, making up a complete flux-limited sample for <italic>S</italic><sub>95μm</sub>≥ 100 mJy. Reliable sources were detected, with decreasing but well-controlled completeness, down to <italic>S</italic><sub>95μm</sub>≃ 20 mJy. We have combined mid-infrared (IR) and radio catalogues in this area to identify the potential optical counterparts of the far-IR sources. We found 14 radio and 13 15-μm associations, 10 of which have both associations. For the 11 sources with spectroscopic redshift, we have performed a spectrophotometric analysis of the observed spectral energy distributions (SEDs). Four of these 95-μm sources have been classified as faint IR (FIR) galaxies (<italic>L</italic><sub>FIR</sub> < 1.<italic>e</italic>11 L<sub>⊙</sub>), six as luminous IR galaxies (LIRGs) and only one as an ultraluminous IR galaxy (ULIRG). We have discussed the redshift distribution of these objects, comparing our results with evolutionary model predictions 95 and 175 μm. Given their moderate distances (the bulk of the closest spectroscopically identified objects lying at <italic>z</italic> < 0.2), their luminosities and star formation rates (SFR; median value ∼ 10 M<sub>⊙</sub> yr<sup>−1</sup>), the sources unveiled by ISOPHOT at 95 μm seem to correspond to the low redshift (<italic>z</italic> < 0.3) FIRBACK 175-μm population, composed of dusty, star-forming galaxies with moderate SFRs. We computed and compared different SFR estimators, and found that the SF derived from the bolometric IR luminosity is well correlated with that computed from the radio and mid-IR fluxes.</p></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>galaxies: evolution</kwd><kwd>galaxies: fundamental parameters</kwd><kwd>infrared: galaxies</kwd></kwd-group></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>A far-infrared view of the Lockman hole from ISO 95-µm observations – II. Optical identifications and insights into the nature of the far-infrared sources</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>A far-infrared view of the Lockman hole from ISO 95-µm observations – II. 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The Rodighiero et al. catalogue includes 36 sources, making up a complete flux-limited sample for S95μm≥ 100 mJy. Reliable sources were detected, with decreasing but well-controlled completeness, down to S95μm≃ 20 mJy. We have combined mid-infrared (IR) and radio catalogues in this area to identify the potential optical counterparts of the far-IR sources. We found 14 radio and 13 15-μm associations, 10 of which have both associations. For the 11 sources with spectroscopic redshift, we have performed a spectrophotometric analysis of the observed spectral energy distributions (SEDs). Four of these 95-μm sources have been classified as faint IR (FIR) galaxies (LFIR < 1.e11 L⊙), six as luminous IR galaxies (LIRGs) and only one as an ultraluminous IR galaxy (ULIRG). We have discussed the redshift distribution of these objects, comparing our results with evolutionary model predictions 95 and 175 μm. Given their moderate distances (the bulk of the closest spectroscopically identified objects lying at z < 0.2), their luminosities and star formation rates (SFR; median value ∼ 10 M⊙ yr−1), the sources unveiled by ISOPHOT at 95 μm seem to correspond to the low redshift (z < 0.3) FIRBACK 175-μm population, composed of dusty, star-forming galaxies with moderate SFRs. We computed and compared different SFR estimators, and found that the SF derived from the bolometric IR luminosity is well correlated with that computed from the radio and mid-IR fluxes.</abstract><subject lang="en"><genre>Keywords</genre><topic>galaxies: evolution</topic><topic>galaxies: fundamental parameters</topic><topic>infrared: galaxies</topic></subject><relatedItem type="host"><titleInfo><title>Monthly Notices of the Royal Astronomical Society</title></titleInfo><titleInfo type="abbreviated"><title>Mon. Not. R. Astron. Soc.</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0035-8711</identifier><identifier type="eISSN">1365-2966</identifier><identifier type="PublisherID">mnras</identifier><identifier type="PublisherID-hwp">mnras</identifier><part><date>2005</date><detail type="volume"><caption>vol.</caption><number>357</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>449</start><end>460</end></extent></part></relatedItem><identifier type="istex">4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2</identifier><identifier type="DOI">10.1111/j.1365-2966.2004.08547.x</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2005 RAS</accessCondition><recordInfo><recordContentSource>OUP</recordContentSource></recordInfo></mods></metadata><annexes><json:item><original>true</original><mimetype>image/jpeg</mimetype><extension>jpeg</extension><uri>https://api.istex.fr/document/4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2/annexes/jpeg</uri></json:item><json:item><original>true</original><mimetype>image/gif</mimetype><extension>gif</extension><uri>https://api.istex.fr/document/4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2/annexes/gif</uri></json:item></annexes><enrichments><istex:catWosTEI uri="https://api.istex.fr/document/4AB7FDBDABBAF8B2A0205DE74F20F0849E0BD9E2/enrichments/catWos"><teiHeader><profileDesc><textClass><classCode scheme="WOS">ASTRONOMY & ASTROPHYSICS</classCode></textClass></profileDesc></teiHeader></istex:catWosTEI></enrichments><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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