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As a part of the "Dust, Ice, and Gas In Time" (DIGIT) key program onHerschel, we observed GSS30-IRS1, a Class I protostar located in Ophiuchus (d =120 pc), with Herschel/Photodetector Array Camera and Spectrometer (PACS). Morethan 70 lines were detected within a wavelength range from 50 micron to 200micron, including CO, H2O, OH, and two atomic [O I] lines at 63 and 145 micron.The [C II] line, known as a tracer of externally heated gas by the interstellarradiation field, is also detected at 158 micron. All lines, except [O I] and [CII], are detected only at the central spaxel of 9.4" X 9.4". The [O I]emissions are extended along a NE-SW orientation, and the [C II] line isdetected over all spaxels, indicative of external PDR. The total [C II]intensity around GSS30 reveals that the far-ultraviolet radiation field is inthe range of 3 to 20 G0, where G0 is in units of the Habing Field, 1.6 X10^{-3} erg cm^{-2} s^{-1}. This enhanced external radiation field heats theenvelope of GSS30-IRS1, causing the continuum emission to be extended, unlikethe molecular emission. The best-fit continuum model of GSS30-IRS1 with thephysical structure including flared disk, envelope, and outflow shows that theinternal luminosity is 10 Lsun, and the region is externally heated by aradiation field enhanced by a factor of 130 compared to the standard localinterstellar radiation field.

"Dust, Ice, and Gas In Time" (DIGIT) Herschel Observations of GSS30-IRS1 in Ophiuchus