2007A&A...470..633G


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET04:08:48

2007A&A...470..633G - Astronomy and Astrophysics, volume 470, 633-638 (2007/8-1)

The origin of the molecular emission around the southern hemisphere Re 4 IRS - HH 188 region.

GIRART J.M. and VITI S.

Abstract (from CDS):

We present SEST observations of the molecular environment ahead of the southern Herbig-Haro object 188 (HH 188), associated with the low-mass protostar Re 4 IRS. We have also used the SuperCosmos Hα survey to search for Hα emission associated with the Re 4 IRS - HH 188 region. The aim of the present work is to study the properties of the molecular gas and to better characterize this southern star forming region. We mapped the HCO+ 3-2 and H13CO+ 1-0 emission around the YSO and took spectra of the CH3OH 20-10 A+ and 2–1-1–1 E and SO 65-54 towards the central source. Column densities are derived and different scenarios are considered to explain the origin of the molecular emission. HCO+ arises from a relatively compact region around the YSO; however, its peak emission is displaced to the south following the outflow direction. Our chemical analysis indicates that a plausible scenario is that most of the emission arises from the cold, illuminated dense gas ahead of the HH 188 object. We have also found that HH 188, a high excitation object, seems to be part of a parsec scale and highly collimated HH system. Re 4 IRS is probably a binary protostellar system, in the late Class 0 or Class I phase. One of the protostars, invisible in the near-IR, seems to power the HH 188 system.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: HH 188 - ISM: abundances - ISM: clouds - ISM: molecules - radio lines: ISM - stars: formation

Nomenclature: Table 3: [GV2007] N (Nos 1-5).

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HH 34E HH 05 35 30.6 -06 29 04           ~ 11 0
2 HH 34 HH 05 35 31.30 -06 28 43.0     16     ~ 468 2
3 HH 1 HH 05 36 20.8 -06 45 13           ~ 401 1
4 HH 2 HH 05 36.4 -06 47           ~ 335 1
5 NAME GUM Nebula ISM 07 43 -42.1           ~ 378 1
6 [GV2007] 1 HH 08 20 57.10 -49 34 31.2           ~ 1 0
7 2MASS J08205824-4934456 IR 08 20 58.25 -49 34 45.7           ~ 2 0
8 DCld 265.8-07.4 DNe 08 20 58.4 -49 34 44           ~ 29 0
9 HH 188 HH 08 20 58.6 -49 34 48           ~ 3 0
10 NAME Reipurth 4 star * 08 20 58.6436994650 -49 34 44.299374616           ~ 2 0
11 HH 246 HH 08 21 14.68 -49 39 32.5           ~ 5 1
12 [GV2007] 4 HH 08 21 18.80 -49 40 11.6           ~ 1 0
13 [GV2007] 5 HH 08 21 29.47 -49 43 28.5           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-04:08:48

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