2016MNRAS.459.1248A


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST01:10:47

2016MNRAS.459.1248A - Mon. Not. R. Astron. Soc., 459, 1248-1258 (2016/June-3)

GMRT detections of low-mass young stars at 323 and 608 MHz.

AINSWORTH R.E., SCAIFE A.M.M., GREEN D.A., COUGHLAN C.P. and RAY T.P.

Abstract (from CDS):

We present the results of a pathfinder project conducted with the Giant Metrewave Radio Telescope (GMRT) to investigate protostellar systems at low radio frequencies. The goal of these investigations is to locate the break in the free-free spectrum where the optical depth equals unity in order to constrain physical parameters of these systems, such as the mass of the ionized gas surrounding these young stars. We detect all three target sources, L1551 IRS 5 (Class I), T Tau and DG Tau (Class II), at frequencies 323 and 608 MHz (wavelengths 90 and 50 cm, respectively). These are the first detections of low-mass young stellar objects at such low frequencies. We combine these new GMRT data with archival information to construct the spectral energy distributions for each system and find a continuation of the optically thin free-free spectra extrapolated from higher radio frequencies to 323 MHz for each target. We use these results to place limits on the masses of the ionized gas and average electron densities associated with these young systems on scales of ∼1000 au. Future observations with higher angular resolution at lower frequencies are required to constrain these physical parameters further.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiation mechanisms: thermal - stars: individual: L1551 IRS 5 - stars: individual: T Tauri - stars: individual: DG Tauri - stars: pre-main-sequence - radio continuum: stars - radio continuum: stars

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2431 2
2 HH 155 HH 04 21 57.1 +19 32 07           ~ 72 1
3 NAME T Tau Sa *i* 04 21 59.371 +19 32 05.95           ~ 65 0
4 NAME T Tau S ** 04 21 59.371 +19 32 05.95           K7 137 2
5 NAME T Tau Sb *i* 04 21 59.371 +19 32 05.95           M1 69 0
6 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1236 2
7 NAME T Tau N *i* 04 21 59.433 +19 32 06.42   11.22 10.12 9.80   K1.5 163 1
8 HH 702 HH 04 26 34.2 +25 57 40           ~ 3 0
9 V* DG Tau TT* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 900 1
10 PKS 0428+205 rG 04 31 03.76136151 +20 37 34.2649550   22.174   19.085   ~ 163 1
11 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 760 1
12 HBC 393 FU* 04 31 34.077 +18 08 04.90           K3V/M3III 772 2
13 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3308 0
14 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1231 1
15 HH 111 HH 05 51 44.2 +02 48 34           ~ 377 0
16 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3615 1
17 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 186 0

    Equat.    Gal    SGal    Ecl

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2019.10.20-01:10:47

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