The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs
Gas interior to the bar of the Milky Way has recently been shown to be the closest example of a low-ionization (nuclear) emission region (LI(N)ER) in the universe. To better understand the nature of this gas, a sample of face-on galaxies with integral field spectroscopy is used to study the ionized...
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| Veröffentlicht in: | The Astrophysical journal 2020-08, Vol.898 (2), p.116 |
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| creator | Krishnarao, Dhanesh Tremonti, Christy Fraser-McKelvie, Amelia Kraljic, Katarina Boardman, Nicholas Fraser Masters, Karen L. Benjamin, Robert A. Haffner, L. Matthew Jones, Amy Pace, Zachary J. Zasowski, Gail Bershady, Matthew Bizyaev, Dmitry Brinkmann, Jonathan Brownstein, Joel R. Drory, Niv Pan, Kaike Zhang, Kai |
| description | Gas interior to the bar of the Milky Way has recently been shown to be the closest example of a low-ionization (nuclear) emission region (LI(N)ER) in the universe. To better understand the nature of this gas, a sample of face-on galaxies with integral field spectroscopy is used to study the ionized gas conditions of 240 barred and 250 nonbarred galaxies, focusing on those that are most similar to the Milky Way. Strong optical line emission of [N ii] λ6584, H , [O iii] λ5007, and Hβ are used to diagnose the dominant ionization mechanisms of gas across galaxies and the Galaxy via Baldwin-Phillips-Terlevich diagrams. Barred galaxies show a strong suppression of star formation and an increase in composite and LI(N)ER-like spectra in their inner regions when compared with similar nonbarred counterparts. This effect is lessened in galaxies of very low ( ) or very high ( ) total stellar mass. Bar masks from Galaxy Zoo:3D show the bar's nonaxisymmetric effect on the ionized gas and help predict the face-on distribution of ionized gas conditions near the bar of the Milky Way. |
| doi_str_mv | 10.3847/1538-4357/ab9fa3 |
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Matthew ; Jones, Amy ; Pace, Zachary J. ; Zasowski, Gail ; Bershady, Matthew ; Bizyaev, Dmitry ; Brinkmann, Jonathan ; Brownstein, Joel R. ; Drory, Niv ; Pan, Kaike ; Zhang, Kai</creator><creatorcontrib>Krishnarao, Dhanesh ; Tremonti, Christy ; Fraser-McKelvie, Amelia ; Kraljic, Katarina ; Boardman, Nicholas Fraser ; Masters, Karen L. ; Benjamin, Robert A. ; Haffner, L. Matthew ; Jones, Amy ; Pace, Zachary J. ; Zasowski, Gail ; Bershady, Matthew ; Bizyaev, Dmitry ; Brinkmann, Jonathan ; Brownstein, Joel R. ; Drory, Niv ; Pan, Kaike ; Zhang, Kai ; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)</creatorcontrib><description>Gas interior to the bar of the Milky Way has recently been shown to be the closest example of a low-ionization (nuclear) emission region (LI(N)ER) in the universe. 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Matthew</creatorcontrib><creatorcontrib>Jones, Amy</creatorcontrib><creatorcontrib>Pace, Zachary J.</creatorcontrib><creatorcontrib>Zasowski, Gail</creatorcontrib><creatorcontrib>Bershady, Matthew</creatorcontrib><creatorcontrib>Bizyaev, Dmitry</creatorcontrib><creatorcontrib>Brinkmann, Jonathan</creatorcontrib><creatorcontrib>Brownstein, Joel R.</creatorcontrib><creatorcontrib>Drory, Niv</creatorcontrib><creatorcontrib>Pan, Kaike</creatorcontrib><creatorcontrib>Zhang, Kai</creatorcontrib><creatorcontrib>Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)</creatorcontrib><title>The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs</title><title>The Astrophysical journal</title><addtitle>APJ</addtitle><addtitle>Astrophys. J</addtitle><description>Gas interior to the bar of the Milky Way has recently been shown to be the closest example of a low-ionization (nuclear) emission region (LI(N)ER) in the universe. 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Bar masks from Galaxy Zoo:3D show the bar's nonaxisymmetric effect on the ionized gas and help predict the face-on distribution of ionized gas conditions near the bar of the Milky Way.</description><subject>Analogs</subject><subject>ASTRONOMY AND ASTROPHYSICS</subject><subject>Astrophysics</subject><subject>Barred galaxies</subject><subject>Barred spiral galaxies</subject><subject>Emission lines</subject><subject>Galaxies</subject><subject>Integral field spectroscopy</subject><subject>Interstellar atomic gas</subject><subject>Interstellar line emission</subject><subject>Interstellar medium</subject><subject>Interstellar radiation field</subject><subject>Ionization</subject><subject>LINER galaxies</subject><subject>Masks</subject><subject>Milky Way</subject><subject>Milky Way Galaxy</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 mass</subject><subject>the Milky Way</subject><issn>0004-637X</issn><issn>1538-4357</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp1kL1PwzAQxS0EEqWwM1ogNkL9ldhhK1WBSq06UASb5Tg2dUnjEKdD-etJFAQLTKd7-r2nuwfAOUY3VDA-wjEVEaMxH6kstYoegMGPdAgGCCEWJZS_HoOTEDbdStJ0AFartYFTa41uoLfwTtUB-hI2rTrzpfs0OZw9LW7hsmqcVgWcbl0IriXmrjQB2tpv4cIV73v4ovZwXKrCv4VTcGRVEczZ9xyC5_vpavIYzZcPs8l4HmmGeBMpQ1nOtMpiRAyzKI2t5gJRomIrEM-MsTrmCaEZRirRFGVWsJwwkeYkMwzRIbjoc31onAzaNUavtS_L9huJuaAYkxa67KGq9h87Exq58bu6PTRIwijCcdKRQ4B6Stc-hNpYWdVuq-q9xEh2BcuuTdm1KfuCW8tVb3G--s1U1UaKVEgiMU5klduWu_6D-zf2Cwhwh1g</recordid><startdate>20200801</startdate><enddate>20200801</enddate><creator>Krishnarao, Dhanesh</creator><creator>Tremonti, Christy</creator><creator>Fraser-McKelvie, Amelia</creator><creator>Kraljic, Katarina</creator><creator>Boardman, Nicholas Fraser</creator><creator>Masters, Karen L.</creator><creator>Benjamin, Robert A.</creator><creator>Haffner, L. 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| subjects | Analogs ASTRONOMY AND ASTROPHYSICS Astrophysics Barred galaxies Barred spiral galaxies Emission lines Galaxies Integral field spectroscopy Interstellar atomic gas Interstellar line emission Interstellar medium Interstellar radiation field Ionization LINER galaxies Masks Milky Way Milky Way Galaxy Spectroscopy Spectrum analysis Star & galaxy formation Star formation Stars Stars & galaxies Stellar mass the Milky Way |
| title | The Effect of Bars on the Ionized ISM: Optical Emission Lines from Milky Way Analogs |
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