/ftp/cats/J/ApJS/175/./509



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J/ApJS/175/509        Ammonia spectral atlas in Perseus      (Rosolowsky+, 2008)
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Beginning of ReadMe : J/ApJS/175/509 Ammonia spectral atlas in Perseus (Rosolowsky+, 2008) ================================================================================ An ammonia spectral atlas of dense cores in Perseus. Rosolowsky E.W., Pineda J.E., Foster J.B., Borkin M.A., Kauffmann J., Caselli P., Myers P.C., Goodman A.A. <Astrophys. J. Suppl. Ser., 175, 509-521 (2008)> =2008ApJS..175..509R ================================================================================ ADC_Keywords: Interstellar medium ; Cross identifications ; Radio lines Keywords: ISM: clouds - ISM: molecules - radio lines: ISM Abstract: We present ammonia observations of 193 dense cores and core candidates in the Perseus molecular cloud made using the Robert F. Byrd Green Bank Telescope. We simultaneously observed the NH_3_(1,1), NH_3_(2,2), C_2_S (2_1_=>1_0_), and C^34^_2_S(2_1_=>1_0_) transitions near nu=23GHz for each of the targets with a spectral resolution of deltav 0.024km/s. We find ammonia emission associated with nearly all of the (sub)millimeter sources, as well as at several positions with no associated continuum emission. For each detection, we have measured physical properties by fitting a simple model to every spectral line simultaneously. Where appropriate, we have refined the model by accounting for low optical depths, multiple components along the line of sight, and imperfect coupling to the GBT beam. For the cores in Perseus, we find a typical kinetic temperature of T_k_=11K, a typical column density of N_NH3_ 10^14.5^/cm2, and velocity dispersions ranging from sigmav=0.07 to 0.7km/s. However, many cores with sigmav>0.2km/s show evidence for multiple velocity components along the line of sight. Description: Observations, using the 100m Robert F. Byrd Green Bank Telescope (GBT), were conducted from 2006 October 2 to November 10 in eight separate observing shifts spanning a total of 59 hr.