NH3 follow-up observations of PGCCs - a diverse sample of 100 dense cores

presenting: Orsolya Fehér
 

collaborators: Tie Liu + TOP-SCOPE, L. Viktor Tóth, Rebeka Bőgner, Victor Toth, Naomi Hirano, Mika Juvela, Julien Montillaud, Isabelle Ristorcelli, Kenichi Tatematsu, Derek Ward-Thompson, Sarolta Zahorecz

GCC workshop, 2018. 06.04-07. Besancon

A joint proposal with the NRO, JCMT and SMA

  • TOP-SCOPE: SCUBA-2 (JCMT) and TRAO observations of > 2000 PGCCs
  • ~ 4000 dense cores (starless, protostellar)
  • follow-ups: NRO 45m, KVN 21m, JCMT, PMO: line surveys, chemical evolutionary states + ALMA follow-up, Arecibo, FAST
    N2H+, CCS, HC3N, DNC, HN13C, N2D+, cyclic C3H2...
     
  • 100 PGCCs in different environments: 36 high-latitude isolated or in clusters, 40 in filaments, 14 massive, clustered and 10 starless
  • NRO, SMA, JCMT: chemical state, accretion, physical condition, density profile, fragmentation, dust properties...

     
  • Effelsberg 100m: NH3(1,1), (2,2) and (3,3): gas temperatures, NH3 abundances, velocity dispersions

observations

  • 2018 February 15-18, 63 hours requested, 69 hours given
  • ~ 10-15 minutes on-target, single pointing + some maps
  • 23.62 - 23.92 GHz, delta f = 4.5 kHz (0.06 km/s), position switching
     
  • NH3 emission towards all sources, 1 source no (2,2), 1 source weak (1,1) and (2,2), 6 sources with (3,3) detection
  • 22.1 - 22.4 GHz: H2O maser
  • DONE:
  • calibrated for atmospheric absorption, elevation
  • converted TA to TMB brightness temperature
  • single pointing (1,1) and (2,2) lines Gaussian and hyperfine fitting
  • calculated: excitation, rotation, kinetic temperatures, NH3 column densities, H2 volume densities

observations

G89.65-7.02A_01
G105.57+10.39_01
G105.57+10.39_02
G107.17+5.44_01
G107.17+5.44_03
G107.25+5.72_01
G109.79+2.71_01
G139.60-3.06_01
G215.8-17.5A1_01
G202.02+2.85_01
G202.02+2.85_02
G202.02+2.85_04
G195.74-2.30_01
G195.74-2.30_02
G178.2-00.6A1_02
G178.2-00.6A2_02
G172.8+02.2A1_01
G172.8+02.2A1_02
G172.8+02.2A1_03
G173.15+02.38_01
G173.15+02.38_02
G173.15+02.38_04
G159.2-20.1A1_01
G159.2-20.1A1_02
G159.2-20.1A1_03

G074.1+00.1A1_01
G074.1+00.1A1_02
G70.10-1.69D_01
G82.39-1.84_01
G82.39-1.84_02
G82.39-1.84_03
G82.39-1.84_04
G82.65-2.00A_01
G82.65-2.00A_02
G006.0+36.7A_01
G001.3+20.9A1_01
G001.3+20.9A1_02
G35.49-0.31_03
G35.49-0.31_05
G35.49-0.31_08
G33.72-0.02_03
G37.91+2.18A_01
G39.73+1.91_01
G017.21-01.46_01
G017.21-01.46_02
G005.91-01.00_01
G005.91-01.00_02
G005.91-01.00_03
G005.91-01.00_04
G005.91-01.00_05

G23.35-0.26_01
G23.35-0.26_04
G24.04+0.26_02
G24.04+0.26_03
G16.36-0.62_01
G16.36-0.62_03
G16.36-0.62_04
G16.36-0.62_09
G16.96+0.27_01
G16.96+0.27_02
G16.96+0.27_03
G16.96+0.27_04
G16.96+0.27_05
G16.96+0.27_06
G035.37-01.76_01
G035.37-01.76_02
G035.37-01.76_06
G86.97-4.06_01
G89.66-6.61_01
G093.5-04.3A1_01
G093.5-04.3A1_03
G91.87+4.18_01
G91.87+4.18_02
G92.03+3.92_01
G92.04+3.93_01

G14.15-0.55_01
G14.15-0.55_02

G14.71-0.19_02
G14.71-0.19_03
G14.71-0.19_04
G14.71-0.19_06
G14.21-0.19_04
G14.21-0.19_07
G14.21-0.19_09
G17.37+2.26_01
G17.37+2.26_02
G17.37+2.26_03
G17.37+2.26_04
G34.73-1.39_02
G69.57-1.74B_01

G69.57-1.74B_02
G23.68+0.57_01

G23.68+0.57_05
G057.1+03.6A1_01

G057.1+03.6A1_02
G10.20-2.40_01

G26.53-0.71_01
G162.4-08.7A2_01

G162.4-08.7A2_02
G171.4-14.9A1_01

RESULTS: STatistics

 [K]

 [K]

 [K]

Number of sources

Number of sources

Number of sources

RESULTS: STatistics

 [cm-2]]

 [cm-2]

sources around 1016 and 1017 cm-2 as well

sources around 1.5 x 105 and 3.5 x 106 cm-2 as well

Number of sources

Number of sources

RESULTS: STatistics

Kinetic temperature [K]

H2 volume density [cm-3]

average 12% relative error in Tkin
average 30% relative error in n(H2)

RESULTS: highs and lows

  • highest kinetic temperatures
          G017.21-01.46: 25 and 26 K and high NH3 column densities

RESULTS: highs and lows

  • highest kinetic temperatures
          G005.91-01.00: 20 - 50 K (high errors), very weak (2,2) and (1,1)
          must be re-observed

RESULTS: highs and lows

  • lowest kinetic temperatures
          G82.39-1.84: coldest filamentary structure (8.8 - 10 K)

RESULTS: highs and lows

  • lowest kinetic temperatures
          G006.0+36.7A1: coldest isolated target (7.8 K) and very high n(H2)

RESULTS: LIne components

  • kinematics:
          G35.49-0.31: overlapping cloud cores in the line of sight

RESULTS: OTHER LINES

  • (3,3) line
          G173.15+02.38: detected for all 3 sources on this field

RESULTS: other lines

  • H2O maser
          on the same field G173.15+02.38

FUture work

  • analysis of line profiles
  • analysis of maps
  • comparison of gas parameters
  • gas parameters vs continuum parameters
  • chemistry, abundance?
  • evaluation of water maser detections
     
  • publication of results

Thank you for the attention!

NH3 follow-up observations of PGCCs - a diverse sample of 100 dense cores

By Orsolya Fehér

NH3 follow-up observations of PGCCs - a diverse sample of 100 dense cores

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