MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES
Dust has long been identified as a barrier to measuring inherent galaxy properties. However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows...
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description | Dust has long been identified as a barrier to measuring inherent galaxy properties. However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows us to map the dust as seen in emission with unprecedented sensitivity and ~1 kpc resolution. We present here new optical integral field unit spectroscopy for eight of these galaxies that provides complementary 100-200 pc scale maps of the dust attenuation through observation of the reddening in both the Balmer decrement and the stellar continuum. The stellar continuum reddening, which is systematically less than that observed in the Balmer decrement, shows no clear correlation with the dust, suggesting that the distribution of stellar reddening acts as a poor tracer of the overall dust content. The brightest H II regions are observed to be preferentially located in dusty regions, and we do find a correlation between the Balmer line reddening and the dust mass surface density for which we provide an empirical relation. Some of the high-inclination systems in our sample exhibit high extinction, but we also find evidence that unresolved variations in the dust disuibution on scales smaller than 500 pc may contribute to the scatter in this relation. We caution against the use of integrated A sub(V) measures to infer global dust properties. |
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However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows us to map the dust as seen in emission with unprecedented sensitivity and ~1 kpc resolution. We present here new optical integral field unit spectroscopy for eight of these galaxies that provides complementary 100-200 pc scale maps of the dust attenuation through observation of the reddening in both the Balmer decrement and the stellar continuum. The stellar continuum reddening, which is systematically less than that observed in the Balmer decrement, shows no clear correlation with the dust, suggesting that the distribution of stellar reddening acts as a poor tracer of the overall dust content. The brightest H II regions are observed to be preferentially located in dusty regions, and we do find a correlation between the Balmer line reddening and the dust mass surface density for which we provide an empirical relation. Some of the high-inclination systems in our sample exhibit high extinction, but we also find evidence that unresolved variations in the dust disuibution on scales smaller than 500 pc may contribute to the scatter in this relation. We caution against the use of integrated A sub(V) measures to infer global dust properties.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.1088/0004-637X/771/1/62</identifier><language>eng</language><publisher>United States: American Astronomical Society</publisher><subject>ABSORPTION ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; ATTENUATION ; BALMER LINES ; Continuums ; Correlation ; CORRELATIONS ; DENSITY ; DISTRIBUTION ; Dust ; DUSTS ; EMISSION ; GALAXIES ; Imaging ; Links ; MASS ; RESOLUTION ; Sciences of the Universe ; SENSITIVITY ; SPECTROSCOPY ; SURFACES</subject><ispartof>The Astrophysical journal, 2013-07, Vol.771 (1), p.1-16</ispartof><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c419t-2de865f5c4261631db63d0d3aa9d646e842c8c73a1f98a50e8495f7ffbbc6bf43</citedby><cites>FETCH-LOGICAL-c419t-2de865f5c4261631db63d0d3aa9d646e842c8c73a1f98a50e8495f7ffbbc6bf43</cites><orcidid>0000-0002-3933-7677 ; 0000-0001-6551-3091 ; 0000-0002-9768-0246</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,315,782,786,887,27931,27932</link.rule.ids><backlink>$$Uhttps://hal.science/hal-03645532$$DView record in HAL$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/22140189$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Kreckel, Kathryn</creatorcontrib><creatorcontrib>Groves, Brent</creatorcontrib><creatorcontrib>Schinnerer, Eva</creatorcontrib><creatorcontrib>Johnson, Benjamin D</creatorcontrib><creatorcontrib>ANIANO, GONZALO</creatorcontrib><creatorcontrib>Calzetti, Daniela</creatorcontrib><creatorcontrib>Croxall, Kevin V</creatorcontrib><creatorcontrib>Draine, Bruce T</creatorcontrib><creatorcontrib>Gordon, Karl D</creatorcontrib><creatorcontrib>Crocker, Alison F</creatorcontrib><title>MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES</title><title>The Astrophysical journal</title><description>Dust has long been identified as a barrier to measuring inherent galaxy properties. However, the link between dust and attenuation is not straightforward and depends on both the amount of dust and its disuibution. Herschel imaging of nearby galaxies undertaken as part of the KINGFISH project allows us to map the dust as seen in emission with unprecedented sensitivity and ~1 kpc resolution. We present here new optical integral field unit spectroscopy for eight of these galaxies that provides complementary 100-200 pc scale maps of the dust attenuation through observation of the reddening in both the Balmer decrement and the stellar continuum. The stellar continuum reddening, which is systematically less than that observed in the Balmer decrement, shows no clear correlation with the dust, suggesting that the distribution of stellar reddening acts as a poor tracer of the overall dust content. The brightest H II regions are observed to be preferentially located in dusty regions, and we do find a correlation between the Balmer line reddening and the dust mass surface density for which we provide an empirical relation. Some of the high-inclination systems in our sample exhibit high extinction, but we also find evidence that unresolved variations in the dust disuibution on scales smaller than 500 pc may contribute to the scatter in this relation. We caution against the use of integrated A sub(V) measures to infer global dust properties.</description><subject>ABSORPTION</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>ATTENUATION</subject><subject>BALMER LINES</subject><subject>Continuums</subject><subject>Correlation</subject><subject>CORRELATIONS</subject><subject>DENSITY</subject><subject>DISTRIBUTION</subject><subject>Dust</subject><subject>DUSTS</subject><subject>EMISSION</subject><subject>GALAXIES</subject><subject>Imaging</subject><subject>Links</subject><subject>MASS</subject><subject>RESOLUTION</subject><subject>Sciences of the Universe</subject><subject>SENSITIVITY</subject><subject>SPECTROSCOPY</subject><subject>SURFACES</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkc1qwkAUhYfSQq3tC3QV6KZdpM5_JqsSNY2BGMUo2NUwTiaYosZmYqFv3wSL63IXl3P4OFzuAeARwVcEhRhACKnLibceeB4aoAHHV6CHGBEuJcy7Br0LcAvurP3sJPb9HnibBvN5nEbOeJUtneVkMVtFEyecxlkWz1InSMdOMMxmi_myk3HqpGGwGH44UZAE6zjM7sFNoXbWPPztPli9h8vRxE1mUTwKEldT5Dcuzo3grGCaYo44QfmGkxzmRCk_55QbQbEW2iMKFb5QDLaGzwqvKDYbzTcFJX3wdM6tbFNKq8vG6K2uDgejG4kxohAJv6VeztRW7eSxLveq_pGVKuUkSGTnQcIpYwR_o5Z9PrPHuvo6GdvIfWm12e3UwVQnK5HXJjLYzj_QFhMMoi4Vn1FdV9bWpricgaDsqpLd62XXhGyrkkhyTH4BObV-HA</recordid><startdate>20130701</startdate><enddate>20130701</enddate><creator>Kreckel, Kathryn</creator><creator>Groves, Brent</creator><creator>Schinnerer, Eva</creator><creator>Johnson, Benjamin D</creator><creator>ANIANO, GONZALO</creator><creator>Calzetti, Daniela</creator><creator>Croxall, Kevin V</creator><creator>Draine, Bruce T</creator><creator>Gordon, Karl D</creator><creator>Crocker, Alison F</creator><general>American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-3933-7677</orcidid><orcidid>https://orcid.org/0000-0001-6551-3091</orcidid><orcidid>https://orcid.org/0000-0002-9768-0246</orcidid></search><sort><creationdate>20130701</creationdate><title>MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES</title><author>Kreckel, Kathryn ; 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subjects | ABSORPTION ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ATTENUATION BALMER LINES Continuums Correlation CORRELATIONS DENSITY DISTRIBUTION Dust DUSTS EMISSION GALAXIES Imaging Links MASS RESOLUTION Sciences of the Universe SENSITIVITY SPECTROSCOPY SURFACES |
title | MAPPING DUST THROUGH EMISSION AND ABSORPTION IN NEARBY GALAXIES |
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