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We present 50-210 um spectral scans of 30 Class 0/I protostellar sources,obtained with Herschel-PACS, and 0.5-1000 um SEDs, as part of the Dust, Ice,and Gas in Time (DIGIT) Key Program. Some sources exhibit up to 75 H2O linesranging in excitation energy from 100-2000 K, 12 transitions of OH, and COrotational lines ranging from J=14-13 up to J=40-39. [O I] is detected in allbut one source in the entire sample; among the sources with detectable [O I]are two Very Low Luminosity Objects (VeLLOs). The mean 63/145 um [O I] fluxratio is 17.2 +/- 9.2. The [O I] 63 um line correlates with Lbol, but not withthe time-averaged outflow rate derived from low-J CO maps. [C II] emission isin general not local to the source. The sample Lbol increased by 1.25 (1.06)and Tbol decreased to 0.96 (0.96) of mean (median) values with the inclusion ofthe Herschel data. Most CO rotational diagrams are characterized by twooptically thin components (<N> = (0.70 +/- 1.12) x 10^49 total particles). N_COcorrelates strongly with Lbol, but neither Trot nor N_CO(warm)/N_CO(hot)correlates with Lbol, suggesting that the total excited gas is related to thecurrent source luminosity, but that the excitation is primarily determined bythe physics of the interaction (e.g., UV- heating/shocks). Rotationaltemperatures for H2O (<Trot> = 194 +/- 85 K) and OH (<Trot> = 183 +/- 117 K)are generally lower than for CO, and much of the scatter in the observationsabout the best fit is attributed to differences in excitation conditions andoptical depths amongst the detected lines.

astrophysical journal/the astrophysical journal

Embedded Protostars in the Dust, Ice, and Gas In Time (DIGIT) Key  Program: Continuum SEDs, and an Inventory of Characteristic Far-Infrared  Lines from PACS Spectroscopy