2007ApJ...667..329S


Query : 2007ApJ...667..329S

2007ApJ...667..329S - Astrophys. J., 667, 329-339 (2007/September-3)

The detection and characterization of centimeter radio continuum emission from the low-mass protostar L1014-IRS.

SHIRLEY Y.L., CLAUSSEN M.J., BOURKE T.L., YOUNG C.H. and BLAKE G.A.

Abstract (from CDS):

Observations by the Cores to Disk Legacy Team with the Spitzer Space Telescope have identified a low-luminosity, mid-infrared source within the dense core, Lynds 1014, which was previously thought to harbor no internal source. Follow-up near-infrared and submillimeter interferometric observations have confirmed the protostellar nature of this source by detecting scattered light from an outflow cavity and a weak molecular outflow. In this paper, we report the detection of centimeter continuum emission with the VLA. The emission is characterized by a quiescent, unresolved 90 µJy 6 cm source within 0.2" of the Spitzer source. The spectral index of the quiescent component is α=0.37±0.34 between 6 and 3.6 cm. A factor of 2 increase in 6 cm emission was detected during one epoch and circular polarization was marginally detected at the 5 σ level with Stokes V/I=48%±16%. We have searched for 22 GHz H2 O maser emission toward L1014-IRS, but no masers were detected during seven epochs of observations between 2004 June and 2006 December. L1014-IRS appears to be a low-mass, accreting protostar, which exhibits centimeter emission from a thermal jet or a wind, with a variable nonthermal emission component. The quiescent cm radio emission is noticeably above the correlation of 3.6 and 6 cm luminosity versus bolometric luminosity, indicating more radio emission than expected. In this paper, we characterize the centimeter continuum emission in terms of observations of other low-mass protostars, including updated correlations of centimeter continuum emission with bolometric luminosity and outflow force, and discuss the implications of recent larger distance estimates on the physical attributes of the protostar and dense molecular core.

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Journal keyword(s): Radiation Mechanisms: Nonthermal - Radiation Mechanisms: Thermal - Radio Continuum: Stars - Stars: Formation

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 0
3 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 483 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
5 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 437 1
6 3C 283 rG 13 11 39.3334 -22 16 41.315   20       ~ 95 1
7 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 799 1
8 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
9 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 108 0
10 IRAS 19243+2350 IR 19 26 30.1 +23 57 01           ~ 7 0
11 LDN 663 DNe 19 36 55 +07 34.4           ~ 698 0
12 NAME GF 9-2 * 20 51 30.1 +60 18 39           ~ 28 1
13 LDN 970 DNe 21 12 13.1 +47 23 23           ~ 67 0
14 LDN 1014 cor 21 24 05.9 +49 59 07           ~ 94 0
15 NAME LDN 1014 IRS Y*O 21 24 07.58 +49 59 08.9           ~ 84 0
16 NVSS J213701+510136 Rad 21 37 00.98616920 +51 01 36.1292444           ~ 35 1
17 * pi.01 Cyg SB* 21 42 05.6606598980 +51 11 22.659654515 3.86 4.55 4.66     B3III 114 0
18 LDN 1070 DNe 21 47.1 +51 04           ~ 14 0

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