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

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    2009_05_l1521f-irs.pdf (2.448Mb)
    Date
    2009-05
    Author
    Terebey, Susan
    Fich, Michael
    Noriega-Crespo, Alberto
    Padgett, Deborah L.
    Fukagawa, Misato
    Audard, Marc
    Brooke, Tyler
    Carey, Sean
    Evans, Neal J.
    Guedel, Manuel
    Hines, Dean
    Huard, Tracy
    Knapp, Gillian R.
    McCabe, Caer-Eve
    Menard, Francois
    Monin, Jean-Louis
    Rebull, Luisa
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    Abstract
    We 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.
    Department
    Astronomy
    Subject
    circumstellar matter
    stars: formation
    stars: individual (l1521f-irs,
    l1527-irs, iras 04368+2557)
    stars: low-mass, brown dwarfs
    spitzer-space-telescope
    auriga molecular cloud
    nearby dense cores
    class-i protostars
    pre-stellar cores
    initial conditions
    interstellar
    dust
    evolutionary status
    protostellar cores
    dark clouds
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35023
    Citation
    Terebey, 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.
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