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 NH3(1,1), NH3(2,2), C2S (21=>10), and C342S(21=>10) transitions near ν=23GHz for each of the targets with a spectral resolution of δv∼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 Tk=11K, a typical column density of NNH3∼1014.5/cm2, and velocity dispersions ranging from σv=0.07 to 0.7km/s. However, many cores with σv>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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 97 193 Summary of Observations table3.dat 154 168 Derived Physical Properties
See also: J/A+A/472/187 : 12CO outflows towards submm cores in Perseus (Hatchell+, 2007) J/ApJ/646/1009 : Structures of dust in Perseus molecular cloud (Kirk+, 2006) J/ApJ/638/293 : 1.1mm sources in the Perseus Molecular Cloud (Enoch+, 2006) J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NH3SRC Running source number (G1) 5 A1 --- r_NH3SRC Origin of source (2) 7- 17 A11 --- Region Region as defined in Figure 1 19- 20 I2 h RAh Hour of Right Ascension (J2000) 22- 23 I2 min RAm Minute of Right Ascension (J2000) 25- 28 F4.1 s RAs Second of Right Ascension (J2000) 30 A1 --- DE- Sign of the Declination (J2000) 31- 32 I2 deg DEd Degree of Declination (J2000) 34- 35 I2 arcmin DEm Arcminute of Declination (J2000) 37- 38 I2 arcsec DEs Arcsecond of Declination (J2000) 40- 42 A3 --- Bolo Enoch et al. (2006, Cat. J/ApJ/638/293) source name (3) 44- 55 A12 --- SCUBA Kirk et al. (2006, Cat. J/ApJ/646/1009) catalog name (3) 57- 58 I2 min tint Total integration time 60- 62 I3 mK rms Noise level in NH_3_(1,1) spectrum (4) 64- 68 F5.2 K.km/s NH3(1,1) Integrated NH_3_(1,1) intensity (4) 70- 73 F4.2 K.km/s e_NH3(1,1) Uncertainty in NH3(1,1) 75- 80 F6.3 K.km/s NH3(2,2) Integrated NH_3_(2,2) intensity (4) 82- 86 F5.3 K.km/s e_NH3(2,2) Uncertainty in NH3(2,2) 88- 92 F5.2 K.km/s C2S Integrated C_2_S(1,1) intensity (4) 94- 97 F4.2 K.km/s e_C2S Uncertainty in C2S
Note (2): Origin of source as follows: B = BOLOCAM Core from Enoch et al. (2006, Cat. J/ApJ/638/293); S = SCUBA Core form Kirk et al. (2006, Cat. J/ApJ/646/1009); D = FIR Dust emission from Schnee et al. (2008ApJ...684.1228S); L = Literature sources in Jijina et al. (1999, Cat. J/ApJS/125/161). Note (3): "N/A" is listed if the position is outside the boundaries of the BOLOCAM ([EYG2006] Bolo NNN in Simbad) or SCUBA survey ([KJD2006] in Simbad). Note (4): On Tmb scale.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NH3SRC Running source number (G1) 4- 5 A2 --- m_NH3SRC [.12 ] Mulltiplicity index (G1) 7 A1 --- f_NH3SRC [b] Multiple components (G1) 9- 15 F7.4 km/s VLSR Source LSR velocity 17- 22 F6.4 km/s e_VLSR Uncertainty in VLSR 24 A1 --- l_sigma Limit flag on sigma 25- 30 F6.4 km/s sigma NH3 line velocity dispersion 32- 37 F6.4 km/s e_sigma Uncertainty in sigma 39 A1 --- l_Tk Limit flag on Tk 40- 44 F5.2 K Tk ? Kinetic temperature 46- 49 F4.2 K e_Tk ? Uncertainty in Tk 51 A1 --- l_NH3 Limit flag on NH3 52- 57 F6.2 10+13cm-2 NH3 ? NH3 line column density 59- 62 F4.2 10+13cm-2 e_NH3 ? Uncertainty in NNH3 (2) 64 A1 --- l_C2S Limit flag on C2S 65- 69 F5.2 10+12cm-2 C2S ? C2S line column density 71- 74 F4.2 10+12cm-2 e_C2S ? Uncertainty in C2S 76- 81 F6.3 --- tau1 ? NH3(1,1) total line opacity 83- 87 F5.3 --- e_tau1 ? Uncertainty in tau1 89- 93 F5.2 K Tx ? NH3 excitation temperature 95- 98 F4.2 K e_Tx ? Uncertainty in Tx 100-103 F4.2 K t1(T-Tb) ? The τ_1_(Tx-T_bg_) value (3) 105-108 F4.2 K e_t1(T-Tb) ? Uncertainty in t1(T-Tb) 110-113 F4.2 --- etaf ? Beam filling fraction when k=Tx (2) 115-119 F5.3 K TC2S ? C2S line peak temperature 121-125 F5.3 K e_TC2S ? Uncertainty in TC2S 127-131 F5.3 km/s sigC2S ? C2S line velocity dispersion 133-137 F5.3 km/s e_sigC2S ? Uncertainty in sigmaC2S 139-144 F6.3 km/s Voff ? C2S line velocity offset with respect to NH3 complex 146-150 F5.3 km/s e_Voff ? Uncertainty in Voff 152-154 F3.1 --- chi2 Reduced χ^2^ fit (4)
Note (2): This property is affected by the overall amplitude calibration which is subject to an additional ∼5% uncertainty. Note (3): For lines-of-sight on which the opacity and excitation temperature cannot be separately determined, the product τ1(Tx-Tbg) is quoted. Note (4): Since data are not completely independent, this is only a goodness-of-fit parameter.
Global Notes: Note (G1): [RPF2008] NH3SRC NNN in Simbad. The source name (NH3SRC) has a decimal in the case of multiple components in table3 which could be fitted independently; a 'b' in the note indicates a spectrum showing evidence for multiple components in one of the spectral lines, that cannot be resolved uniquely by multicomponent fitting.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Jun-2009
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