Far-Infrared Observations Of The Very Low Luminosity Embedded Source L1521F-IRS In The Taurus Star-Forming Region

dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.creatorTerebey, Susanen_US
dc.creatorFich, Michaelen_US
dc.creatorNoriega-Crespo, Albertoen_US
dc.creatorPadgett, Deborah L.en_US
dc.creatorFukagawa, Misatoen_US
dc.creatorAudard, Marcen_US
dc.creatorBrooke, Tyleren_US
dc.creatorCarey, Seanen_US
dc.creatorEvans, Neal J.en_US
dc.creatorGuedel, Manuelen_US
dc.creatorHines, Deanen_US
dc.creatorHuard, Tracyen_US
dc.creatorKnapp, Gillian R.en_US
dc.creatorMcCabe, Caer-Eveen_US
dc.creatorMenard, Francoisen_US
dc.creatorMonin, Jean-Louisen_US
dc.creatorRebull, Luisaen_US
dc.description.abstractWe investigate the environment of the very low luminosity object L1521F-IRS using data from the Taurus Spitzer Legacy Survey. The MIPS 160 mu m image shows both extended emission from the Taurus cloud and emission from multiple cold cores over a 1 degrees x 2 degrees region. Analysis shows that the cloud dust temperature is 14.2 +/- 0.4 K and the extinction ratio is A(160)/A(K) = 0.010 +/- 0.001 up to A(V) similar to 4 mag. We find kappa(160) = 0.23 +/- 0.046 cm(2) g(-1) for the specific opacity of the gas-dust mixture. Therefore, for dust in the Taurus cloud we find that the 160 mu m opacity is significantly higher than that measured for the diffuse interstellar medium, but not too different from dense cores, even at modest extinction values. Furthermore, the 160 mu m image shows features that do not appear in the IRAS 100 mu m image. We identify six regions as cold cores, i.e., colder than 14.2 K, all of which have counterparts in extinction maps or C(18)O maps. Three of the six cores contain embedded young stellar objects, which demonstrates the cores are sites of current star formation. We compare the effects of L1521F-IRS on its natal core and find there is no evidence for dust heating at 160 or 100 mu m by the embedded source. From the infrared luminosity L(TIR) = 0.024 L(circle dot) we find L(bol_int) = 0.034 -0.046 L(circle dot), thus confirming the source's low luminosity. Comparison of L1521F-IRS with theoretical simulations for the very early phases of star formation appears to rule out the first core collapse phase. The evolutionary Stateappears similar to or younger than the class 0 phase, and the estimated mass is likely to be substellar.en_US
dc.description.sponsorshipNASA 1407en_US
dc.description.sponsorshipSwiss National Science Foundation PP002-110504en_US
dc.identifier.citationTerebey, Susan, Michel Fich, Alberto Noriega-Crespo, Deborah L. Padgett, Misato Fukagawa, Marc Audard, Tim Brooke et al. "Far-Infrared Observations of the Very Low Luminosity Embedded Source L1521F-IRS in the Taurus Star-Forming Region." The Astrophysical Journal, Vol. 696, No. 2 (May., 2009): 1918.en_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.subjectcircumstellar matteren_US
dc.subjectstars: formationen_US
dc.subjectstars: individual (l1521f-irs,en_US
dc.subjectl1527-irs, iras 04368+2557)en_US
dc.subjectstars: low-mass, brown dwarfsen_US
dc.subjectauriga molecular clouden_US
dc.subjectnearby dense coresen_US
dc.subjectclass-i protostarsen_US
dc.subjectpre-stellar coresen_US
dc.subjectinitial conditionsen_US
dc.subjectevolutionary statusen_US
dc.subjectprotostellar coresen_US
dc.subjectdark cloudsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleFar-Infrared Observations Of The Very Low Luminosity Embedded Source L1521F-IRS In The Taurus Star-Forming Regionen_US
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