2018A&A...615L..14M


Query : 2018A&A...615L..14M

2018A&A...615L..14M - Astronomy and Astrophysics, volume 615, L14-14 (2018/7-1)

Revised SED of the triple protostellar system VLA 1623-2417.

MURILLO N.M., HARSONO D., McCLURE M., LAI S.-P. and HOGERHEIJDE M.R.

Abstract (from CDS):


Context. VLA 1623-2417 is a triple protostellar system deeply embedded in Ophiuchus A. Sources A and B have a separation of 1.1'', making their study difficult beyond the submillimeter regime. Lack of circumstellar gas emission suggested that VLA 1623-2417 B has a very cold envelope and is much younger than source A, which is generally considered the prototypical Class 0 source.
Aims. We explore the consequences of new ALMA Band 9 data on the spectral energy distribution (SED) of VLA 1623-2417 and their inferred nature.
Methods. We constructed and analyzed the SED of each component in VLA 1623-2417 using dust continuum observations spanning from centimeter to near-infrared wavelengths.
Results. The ALMA Band 9 data presented in this work show that the SED of VLA 1623-2417 B does not peak at 850um as previously expected, but instead presents the same shape as VLA 1623-2417 A at wavelengths shorter than 450um.
Conclusions. The results presented in this work indicate that the previous assumption that the flux in Herschel and Spitzer observations is solely dominated by VLA 1623-2417 A is not valid, and instead, VLA 1623-2417 B most likely contributes a significant portion of the flux at λ<450um. These results, however, do not explain the lack of circumstellar gas emission and puzzling nature of VLA 1623-2417 B.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: formation - stars: low-mass - ISM: individual objects: VLA 1623-2417 - methods: observational - techniques: interferometricW

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ALMA J162625.63-242429.5 Y*O 16 26 25.62 -24 24 28.9           ~ 32 1
2 GBS-VLA J162626.31-242430.2 Y*O 16 26 26.31 -24 24 30.7           ~ 13 0
3 GBS-VLA J162626.39-242430.9 Y*O 16 26 26.39 -24 24 30.8           ~ 25 0
4 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 397 0
5 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3397 1
6 QSO J1700-2610 QSO 17 00 53.1542036424 -26 10 51.722383908   16.50       ~ 99 1
7 QSO B1730-130 QSO 17 33 02.7055087032 -13 04 49.545516612   18 18.5 18.78 17.39 ~ 1072 1
8 QSO B1921-293 BLL 19 24 51.0555700728 -29 14 30.118109640   18.71 18.21 15.07   ~ 783 0

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2022.09.30-18:18:06

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