Ionized Gas Kinematics At High Resolution. II. Discovery Of A Double Infrared Cluster In II Zw 40

dc.contributor.utaustinauthorLacy, Johnen_US
dc.creatorBeck, Saraen_US
dc.creatorTurner, Jeanen_US
dc.creatorLacy, Johnen_US
dc.creatorGreathouse, Thomas K.en_US
dc.creatorLahad, Ohren_US
dc.date.accessioned2016-04-28T19:36:44Z
dc.date.available2016-04-28T19:36:44Z
dc.date.issued2013-04en
dc.description.abstractThe nearby dwarf galaxy II Zw 40 hosts an intense starburst. At the center of the starburst is a bright compact radio and infrared source, thought to be a giant dense H II region containing approximate to 14,000 O stars. Radio continuum images suggest that the compact source is actually a collection of several smaller emission regions. We accordingly use the kinematics of the ionized gas to probe the structure of the radio-infrared emission region. With TEXES on the NASA-IRTF we measured the 10.5 mu m [S IV] emission line with effective spectral resolutions, including thermal broadening, of similar to 25 and similar to 3 km s(-1) and spatial resolution similar to 1 ''. The line profile shows two distinct, spatially coextensive, emission features. The stronger feature is at galactic velocity and has FWHM 47 km s(-1). The second feature is similar to 44 km s(-1) redward of the first and has FWHM 32 km s(-1). We argue that these are two giant embedded clusters, and estimate their masses to be approximate to 3 x 10(5) M-circle dot and approximate to 1.5 x 10(5) M-circle dot. The velocity shift is unexpectedly large for such a small spatial offset. We suggest that it may arise in a previously undetected kinematic feature remaining from the violent merger that formed the galaxy.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipUniversity of Hawaii NNX-08AE38Aen_US
dc.description.sponsorshipNSF AST-0607312en_US
dc.description.sponsorshipNASAen_US
dc.identifierdoi:10.15781/T23Z5J
dc.identifier.Filename2013_04_ionizedgas.pdfen_US
dc.identifier.citationBeck, Sara, Jean Turner, John Lacy, Thomas Greathouse, and Ohr Lahad. "Ionized Gas Kinematics at High Resolution. II. Discovery of a Double Infrared Cluster in II Zw 40." The Astrophysical Journal, Vol. 767, No. 1 (Apr., 2013): 53.en_US
dc.identifier.doi10.1088/0004-637x/767/1/53en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34903
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxies: individual (ii zw 40)en_US
dc.subjectgalaxies: starbursten_US
dc.subjectgalaxies: staren_US
dc.subjectclusters: generalen_US
dc.subjectgalactic molecular cloudsen_US
dc.subjectmidinfrared spectroscopyen_US
dc.subjectstarburst galaxiesen_US
dc.subjectstar-formationen_US
dc.subjecttidal tailsen_US
dc.subjectcompacten_US
dc.subjectabundancesen_US
dc.subjectregionsen_US
dc.subjectdwarfsen_US
dc.subjectmassen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleIonized Gas Kinematics At High Resolution. II. Discovery Of A Double Infrared Cluster In II Zw 40en_US
dc.typeArticleen_US

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