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    Embedded Protostars In The Dust, Ice, And Gas In Time (DIGIT) Herschel Key Program: Continuum Seds, And An Inventory Of Characteristic Far-Infrared Lines From Pacs Spectroscopy

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    2013_06_embeddedprotostars.pdf (4.354Mb)
    Date
    2013-06
    Author
    Green, Joel D.
    Evans, Neal J.
    Jorgensen, Jes K.
    Herczeg, Gregory J.
    Kristensen, Lars E.
    Lee, Jeong-Eun
    Dionatos, Odysseas
    Yildiz, Umut A.
    Salyk, Colette
    Meeus, Gwendolyn
    Bouwman, Jeroen
    Visser, Ruud
    Bergin, Edwin A.
    van Dishoeck, Ewine F.
    Rascati, Michelle R.
    Karska, Agata
    van Kempen, Tim A.
    Dunham, Michael M.
    Lindberg, Johan E.
    Fedele, Davide
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    Abstract
    We present 50-210 mu m spectral scans of 30 Class 0/I protostellar sources, obtained with Herschel-PACS, and 0.5-1000 mu m spectral energy distributions, as part of the Dust, Ice, and Gas in Time Key Program. Some sources exhibit up to 75 H2O lines ranging in excitation energy from 100 to 2000 K, 12 transitions of OH, and CO rotational lines ranging from J = 14 -> 13 up to J = 40 -> 39. [O I] is detected in all but one source in the entire sample; among the sources with detectable [O I] are two very low luminosity objects. The mean 63/145 mu m [O I] flux ratio is 17.2 +/- 9.2. The [O I] 63 mu m line correlates with L-bol, but not with the time-averaged outflow rate derived from low-J CO maps. [C II] emission is in general not local to the source. The sample L-bol increased by 1.25 (1.06) and T-bol decreased to 0.96 (0.96) of mean (median) values with the inclusion of the Herschel data. Most CO rotational diagrams are characterized by two optically thin components (< N > = ( 0.70 +/- 1.12) x 10(49) total particles). N-CO correlates strongly with L-bol, but neither T-rot nor N-CO(warm)/N-CO(hot) correlates with L-bol, suggesting that the total excited gas is related to the current source luminosity, but that the excitation is primarily determined by the physics of the interaction (e.g., UV-heating/shocks). Rotational temperatures for H2O (< T-rot > = 194 +/- 85 K) and OH (< T-rot > = 183 +/- 117 K) are generally lower than for CO, and much of the scatter in the observations about the best fit is attributed to differences in excitation conditions and optical depths among the detected lines.
    Department
    Astronomy
    Subject
    circumstellar matter
    stars: formation
    stars: pre-main sequence
    stars:
    winds, outflows
    submillimeter: stars
    spitzer-space-telescope
    low-mass protostars
    young stellar objects
    star-forming regions
    iso-lws observations
    ophiuchi molecular cloud
    t-tauri stars
    evolutionary signatures
    legacy clouds
    shock-waves
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35055
    Citation
    Green, Joel D., Neal J. Evans, Jes K. J�rgensen, Gregory J. Herczeg, Lars E. Kristensen, Jeong-Eun Lee, Odysseas Dionatos et al. "Embedded protostars in the dust, ice, and gas in time (DIGIT) Herschel key program: continuum SEDs, and an inventory of characteristic far-infrared lines from PACs spectroscopy." The Astrophysical Journal, Vol. 770, No. 2 (Jun., 2013): 123.
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