2010A&A...523A..16L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.25CET07:51:51

2010A&A...523A..16L - Astronomy and Astrophysics, volume 523, A16-16 (2010/11-2)

HH 223: a parsec-scale H2 outflow in the star-forming region L723.

LOPEZ R., ACOSTA-PULIDO J.A., GOMEZ G., ESTALELLA R. and CARRASCO-GONZALEZ C.

Abstract (from CDS):

The dark cloud Lynds 723 (L723) is a low-mass star-forming region where one of the few known cases of a quadrupolar CO outflow has been reported. Two recent works have found that the radio continuum source VLA 2, towards the centre of the CO outflow, is actually a multiple system of young stellar objects (YSOs). Several line-emission nebulae that lie projected on the east-west CO outflow were detected in narrow-band Hα and [SII] images. The spectra of the knots are characteristic of shock-excited gas (Herbig-Haro spectra), with supersonic blueshifted velocities, which suggests an optical outflow also powered by the VLA 2 YSO system of L723. Our aim is to study L723 in the near-infrared and look for line-emission nebulae associated with the optical and CO outflows. We imaged a field of ∼5'x5' centred on HH 223, which includes the whole region of the quadrupolar CO outflow with narrow-band filters centred on the [FeII] 1.644µm and H2 2.122µm lines, together with off-line Hc and Kc filters. The [Feii] and H2 line-emission structures were identified after extracting the continuum contribution, if any. Their positions were determined from an accurate astrometry of the images. The H2 line-emission structures appear distributed over a region of 5.5' (∼0.5pc for a distance of 300pc) at both sides of the VLA 2 YSO system, with an S-shape morphology, and are projected onto the east-west CO outflow. Most of them were resolved in smaller knotty substructures. The [FeII] emission only appears associated with HH 223. An additional nebular emission from the continuum in Hc and Kc appears associated with HH 223-K1, the structure closest to the VLA 2 YSO system, and could be tracing the cavity walls. We propose that the H2 structures form part of a large-scale near-infrared outflow, which is also associated with the VLA 2 YSO system. The current data do not allow us to discern which of the YSOs of VLA 2 is powering this large scale optical/near-infrared outflow.

Abstract Copyright:

Journal keyword(s): stars: formation - Herbig-Haro objects - infrared: ISM - ISM: jets and outflows

VizieR on-line data: <Available at CDS (J/A+A/523/A16): list.dat images/*>

Simbad objects: 27

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Number of rows : 27

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 2MASS J04314444+1808315 Y*O 04 31 44.447 +18 08 31.54           ~ 144 1
2 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2486 0
3 [LEG2006] HH 223-NW2 ISM 19 17 46.8 +19 13 12           ~ 4 0
4 [LEG2006] HH 223-NW1 ISM 19 17 47.3 +19 13 01           ~ 4 0
5 [PE99] H2-NW ISM 19 17 51.6 +19 12 40           ~ 4 0
6 NAME LDN 723 VLA 1 Rad 19 17 52.91 +19 12 08.9           ~ 15 0
7 NAME LDN 723 VLA 2 Rad 19 17 53.67 +19 12 19.5           ~ 26 0
8 [CAR2008] VLA 2A Rad 19 17 53.673 +19 12 19.59           ~ 7 0
9 [CAR2008] VLA 2B Rad 19 17 53.685 +19 12 19.34           ~ 5 0
10 [GRE2009] SMA 2 smm 19 17 53.694 +19 12 19.68           ~ 5 0
11 [GRE2009] SMA 1 smm 19 17 53.884 +19 12 18.51           ~ 5 0
12 [PE99] K1 ISM 19 17 54.2 +19 12 19           ~ 5 0
13 [PE99] K2 ISM 19 17 54.3 +19 12 15           ~ 5 0
14 [LEG2006] L723 N2 ISM 19 17 55.0 +19 11 53           ~ 3 0
15 HH 223F HH 19 17 56.66 +19 11 50.9           ~ 4 0
16 HH 223F1 HH 19 17 56.66 +19 11 50.9           ~ 4 0
17 HH 223E HH 19 17 57.03 +19 11 52.1           ~ 5 0
18 HH 223 HH 19 17 57.4 +19 11 53           ~ 9 0
19 HH 223C HH 19 17 57.43 +19 11 53.3           ~ 5 0
20 HH 223A HH 19 17 57.97 +19 11 50.7           ~ 5 0
21 [LEG2006] L723 N1 ISM 19 17 59.0 +19 11 42           ~ 3 0
22 [LEG2006] HH 223-SE2 ISM 19 18 04.3 +19 11 16           ~ 3 0
23 [VLS86] LDN 723 83 * 19 18 06.0 +19 11 21           ~ 3 0
24 [LEG2006] HH 223-SE1 ISM 19 18 06.1 +19 11 21           ~ 3 0
25 LDN 723 DNe 19 18 12 +19 13.6           ~ 153 0
26 [CAR2008] VLA 2D Rad ~ ~           ~ 5 0
27 [CAR2008] VLA 2C Rad ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.02.25-07:51:51

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