PMAS Optical Integral Field Spectroscopy of Luminous Infrared Galaxies. II.-- Spatially resolved stellar populations and excitation conditions
The general properties of luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe are well known since large samples of these objects have been the subject of numerous spectroscopic works. There are, however, relatively few studies of large samples of LIRGs and ULIRGs u...
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| creator | Alonso-Herrero, Almudena Garcia-Marin, Macarena Javier Rodriguez Zaurin Monreal-Ibero, Ana Colina, Luis Arribas, Santiago |
| description | The general properties of luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe are well known since large samples of these objects have been the subject of numerous spectroscopic works. There are, however, relatively few studies of large samples of LIRGs and ULIRGs using integral field spectroscopy (IFS). We analyze optical (3800-7200A) IFS data taken with the Potsdam Multi-Aperture Spectrophotometer (PMAS) of the central few kiloparsecs of 11 LIRGs. To study the stellar populations we fit the optical stellar continuum and the hydrogen recombination lines of selected regions. We analyze the excitation conditions of the gas using the spatially resolved properties of the brightest optical emission lines. The optical continua of the selected regions are well fitted with a combination of evolved (~0.7-10Gyr) and ionizing (1-20Myr) stellar populations. The latter is more obscured than the evolved population, and has visual extinctions in good agreement with those obtained from the Balmer decrement. Except for NGC 7771, there is no clear evidence for an important contribution to the optical light from an intermediate-aged population (~100-500Myr). Even after correcting for the presence of stellar absorption, a large fraction of spaxels with low observed equivalent widths of Halpha in emission still show enhanced [NII]/Halpha and [SII]/Halpha ratios. These ratios are likely to be produced by a combination of photoionization in HII regions and diffuse emission. These regions of enhanced ratios are generally coincident with low surface brightness HII regions and diffuse emission detected in the Halpha and Pa-alpha images. Using the PMAS line ratios and the NICMOS Pa-alpha photometry of HII regions we find that the fraction of diffuse emission in LIRGs varies from galaxy to galaxy, and it is generally less than 60% as found in other starburst galaxies. (Abridged) |
| doi_str_mv | 10.48550/arxiv.1006.2219 |
| format | Article |
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II.-- Spatially resolved stellar populations and excitation conditions</title><source>arXiv.org</source><source>Free E- Journals</source><creator>Alonso-Herrero, Almudena ; Garcia-Marin, Macarena ; Javier Rodriguez Zaurin ; Monreal-Ibero, Ana ; Colina, Luis ; Arribas, Santiago</creator><creatorcontrib>Alonso-Herrero, Almudena ; Garcia-Marin, Macarena ; Javier Rodriguez Zaurin ; Monreal-Ibero, Ana ; Colina, Luis ; Arribas, Santiago</creatorcontrib><description>The general properties of luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe are well known since large samples of these objects have been the subject of numerous spectroscopic works. There are, however, relatively few studies of large samples of LIRGs and ULIRGs using integral field spectroscopy (IFS). We analyze optical (3800-7200A) IFS data taken with the Potsdam Multi-Aperture Spectrophotometer (PMAS) of the central few kiloparsecs of 11 LIRGs. To study the stellar populations we fit the optical stellar continuum and the hydrogen recombination lines of selected regions. We analyze the excitation conditions of the gas using the spatially resolved properties of the brightest optical emission lines. The optical continua of the selected regions are well fitted with a combination of evolved (~0.7-10Gyr) and ionizing (1-20Myr) stellar populations. The latter is more obscured than the evolved population, and has visual extinctions in good agreement with those obtained from the Balmer decrement. Except for NGC 7771, there is no clear evidence for an important contribution to the optical light from an intermediate-aged population (~100-500Myr). Even after correcting for the presence of stellar absorption, a large fraction of spaxels with low observed equivalent widths of Halpha in emission still show enhanced [NII]/Halpha and [SII]/Halpha ratios. These ratios are likely to be produced by a combination of photoionization in HII regions and diffuse emission. These regions of enhanced ratios are generally coincident with low surface brightness HII regions and diffuse emission detected in the Halpha and Pa-alpha images. Using the PMAS line ratios and the NICMOS Pa-alpha photometry of HII regions we find that the fraction of diffuse emission in LIRGs varies from galaxy to galaxy, and it is generally less than 60% as found in other starburst galaxies. 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The optical continua of the selected regions are well fitted with a combination of evolved (~0.7-10Gyr) and ionizing (1-20Myr) stellar populations. The latter is more obscured than the evolved population, and has visual extinctions in good agreement with those obtained from the Balmer decrement. Except for NGC 7771, there is no clear evidence for an important contribution to the optical light from an intermediate-aged population (~100-500Myr). Even after correcting for the presence of stellar absorption, a large fraction of spaxels with low observed equivalent widths of Halpha in emission still show enhanced [NII]/Halpha and [SII]/Halpha ratios. These ratios are likely to be produced by a combination of photoionization in HII regions and diffuse emission. These regions of enhanced ratios are generally coincident with low surface brightness HII regions and diffuse emission detected in the Halpha and Pa-alpha images. 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(Abridged)</description><subject>Apertures</subject><subject>Excitation</subject><subject>Hydrogen recombinations</subject><subject>Image detection</subject><subject>Infrared astronomy</subject><subject>Integral field spectroscopy</subject><subject>Local group (astronomy)</subject><subject>Optical properties</subject><subject>Photoionization</subject><subject>Photometry</subject><subject>Physics - Cosmology and Nongalactic Astrophysics</subject><subject>Spectrum analysis</subject><subject>Star & galaxy formation</subject><subject>Starburst galaxies</subject><subject>Stars & galaxies</subject><subject>Stellar evolution</subject><subject>Stellar populations</subject><subject>Surface brightness</subject><subject>Universe</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotkMFqwzAMhs1gsNL1vtMw7JzMluMkPZayboGODtp7UGJnuLhxZielfYk989J2J0n8n4T4CHniLE5yKdkr-pM5xpyxNAbg8zsyASF4lCcAD2QWwp4xBmkGUooJ-f36XGzpputNjZYWba-__disjLaKbjtd996F2nVn6hq6Hg6mdUMYucaj14q-o8WT0SGmRRFH0biBvUFrz9Tr4OxxREKvrUVPO9cNdkxdGyi2iupTbfrrTGvXKnNNHsl9gzbo2X-dkt3qbbf8iNab92K5WEcoOURCclWlmEvNIFeQKMREqIZXSnIOqchEo7OmkolSmapApSjTClkjVYVzKSoxJc-3s1dXZefNAf25vDgrL85G4OUGdN79DDr05d4Nvh1fKoHlIOYsESD-AAoHcbQ</recordid><startdate>20100611</startdate><enddate>20100611</enddate><creator>Alonso-Herrero, Almudena</creator><creator>Garcia-Marin, Macarena</creator><creator>Javier Rodriguez Zaurin</creator><creator>Monreal-Ibero, Ana</creator><creator>Colina, Luis</creator><creator>Arribas, Santiago</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20100611</creationdate><title>PMAS Optical Integral Field Spectroscopy of Luminous Infrared Galaxies. 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The optical continua of the selected regions are well fitted with a combination of evolved (~0.7-10Gyr) and ionizing (1-20Myr) stellar populations. The latter is more obscured than the evolved population, and has visual extinctions in good agreement with those obtained from the Balmer decrement. Except for NGC 7771, there is no clear evidence for an important contribution to the optical light from an intermediate-aged population (~100-500Myr). Even after correcting for the presence of stellar absorption, a large fraction of spaxels with low observed equivalent widths of Halpha in emission still show enhanced [NII]/Halpha and [SII]/Halpha ratios. These ratios are likely to be produced by a combination of photoionization in HII regions and diffuse emission. These regions of enhanced ratios are generally coincident with low surface brightness HII regions and diffuse emission detected in the Halpha and Pa-alpha images. 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| subjects | Apertures Excitation Hydrogen recombinations Image detection Infrared astronomy Integral field spectroscopy Local group (astronomy) Optical properties Photoionization Photometry Physics - Cosmology and Nongalactic Astrophysics Spectrum analysis Star & galaxy formation Starburst galaxies Stars & galaxies Stellar evolution Stellar populations Surface brightness Universe |
| title | PMAS Optical Integral Field Spectroscopy of Luminous Infrared Galaxies. II.-- Spatially resolved stellar populations and excitation conditions |
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