2006ApJ...644..279R


Query : 2006ApJ...644..279R

2006ApJ...644..279R - Astrophys. J., 644, 279-282 (2006/June-2)

VLA observations of carbon 91α recombination line emission in W49 north.

ROSHI D.A., DE PREE C.G., GOSS W.M. and ANANTHARAMAIAH K.R.

Abstract (from CDS):

We have detected C91α (8.5891 GHz) emission toward four ultracompact H II regions (UCHs; W49G, J, L, and C) in the W49 North massive star-forming region with the Very Large Array (VLA) at 3" resolution. No carbon line emission was detected toward UCHs W49F, A, O, S, and Q at this frequency to a 3 σ level of 2 mJy. We also observed the same region in the C75α line (15.3 GHz) with no detection at a 3 σ level of 6 mJy with a 1".7 beam. Detection of line emission toward these sources add supporting data to the 2005 result of Roshi et al. that many UCHs have an associated photodissociation region (PDR). The similarity of the LSR velocities of carbon recombination lines and H2CO absorption toward UCHs in W49 North suggests that the PDRs reside in the dense interface zone surrounding these H II regions. Combining the observed carbon line parameters at 8.6 GHz with the upper limits on line emission at 15.3 GHz, we obtain constraints on the physical properties of the PDRs associated with W49G and J. The upper limit on the number density of hydrogen molecule obtained from carbon line models is ∼5x106/cm3.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: General - Line: Formation - Radio Continuum: ISM - Radio Lines: ISM

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3684 3
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5467 1
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3912 2
4 [DJW84] W49 Q HII 19 10 10.51 +09 05 11.9           ~ 12 1
5 [DJW84] W49 S HII 19 10 11.73 +09 05 27.2           ~ 11 1
6 [DJW84] W49 A HII 19 10 12.93 +09 06 11.9           ~ 31 0
7 [DJW84] W49 C HII 19 10 13.19 +09 06 18.8           ~ 18 0
8 [DJW84] W49 F HII 19 10 13.38 +09 06 21.5           ~ 17 0
9 [DJW84] W49 G HII 19 10 13.57 +09 06 12.9           ~ 25 0
10 [DJW84] W49 J HII 19 10 14.14 +09 06 15.4           ~ 13 0
11 [DJW84] W49 L HII 19 10 14.54 +09 06 18.9           ~ 11 0
12 [DJW84] W49 O Rad 19 10 16.34 +09 06 07.1           ~ 8 0
13 W 49 SFR 19 10 20 +09 07.7           ~ 529 1
14 GB6 B1920+1524 Rad 19 22 34.6993758 +15 30 10.032861           ~ 47 0

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2021.09.26-05:29:02

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