2021ApJ...910...11O

Query : 2021ApJ...910...11O

2021ApJ...910...11O - Astrophys. J., 910, 11-11 (2021/March-3)

FAUST. II. Discovery of a secondary outflow in IRAS 15398-3359: variability in outflow direction during the earliest stage of star formation?

OKODA Y., OYA Y., FRANCIS L., JOHNSTONE D., INUTSUKA S.-I., CECCARELLI C., CODELLA C., CHANDLER C., SAKAI N., AIKAWA Y., ALVES F.O., BALUCANI N., BIANCHI E., BOUVIER M., CASELLI P., CAUX E., CHARNLEY S., CHOUDHURY S., DE SIMONE M., DULIEU F., DURAN A., EVANS L., FAVRE C., FEDELE D., FENG S., FONTANI F., HAMA T., HANAWA T., HERBST E., HIROTA T., IMAI M., ISELLA A., JIMENEZ-SERRA I., KAHANE C., LEFLOCH B., LOINARD L., LOPEZ-SEPULCRE A., MAUD L.T., MAUREIRA M.J., MENARD F., MERCIMEK S., MIOTELLO A., MOELLENBROCK G., MORI S., MURILLO N.M., NAKATANI R., NOMURA H., OBA Y., O'DONOGHUE R., OHASHI S., OSPINA-ZAMUDIO J., PINEDA J.E., PODIO L., RIMOLA A., SAKAI T., SEGURA-COX D., SHIRLEY Y., SVOBODA B., TAQUET V., TESTI L., VASTEL C., VITI S., WATANABE N., WATANABE Y., WITZEL A., XUE C., ZHANG Y., ZHAO B. and YAMAMOTO S.

Abstract (from CDS):

We have observed the very low-mass Class 0 protostar IRAS 15398-3359 at scales ranging from 50 to 1800 au, as part of the Atacama Large Millimeter/Submillimeter Array Large Program FAUST. We uncover a linear feature, visible in H2CO, SO, and C18O line emission, which extends from the source in a direction almost perpendicular to the known active outflow. Molecular line emission from H2CO, SO, SiO, and CH3OH further reveals an arc-like structure connected to the outer end of the linear feature and separated from the protostar, IRAS 15398-3359, by 1200 au. The arc-like structure is blueshifted with respect to the systemic velocity. A velocity gradient of 1.2 km s–1 over 1200 au along the linear feature seen in the H2CO emission connects the protostar and the arc-like structure kinematically. SO, SiO, and CH3OH are known to trace shocks, and we interpret the arc-like structure as a relic shock region produced by an outflow previously launched by IRAS 15398-3359. The velocity gradient along the linear structure can be explained as relic outflow motion. The origins of the newly observed arc-like structure and extended linear feature are discussed in relation to turbulent motions within the protostellar core and episodic accretion events during the earliest stage of protostellar evolution.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Stellar jets - Star formation - Shocks - Protostars - Young stellar objects - Interstellar medium - Interstellar molecules - Astrochemistry

Simbad objects: 26

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Number of rows : 26
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 JCMTSE J032536.1+304514 Y*O 03 25 36.22 +30 45 15.7           ~ 145 0
2 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 371 0
3 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 513 3
4 [HSW2018] NGC 1333-17 smm 03 29 03.73 +31 16 03.8           ~ 131 0
5 NAME HH 7-11 FIR 03 29 03.9 +31 16 06           ~ 357 0
6 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 770 1
7 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 414 0
8 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 224 1
9 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 173 0
10 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
11 NAME HH 46-47 HH 08 25 43.6 -51 00 36           ~ 216 2
12 [PCW91] Ced 110 IRS 10 Y*O 11 06 33.38 -77 23 34.6           ~ 79 1
13 [B2001b] IRS 1 Y*O 12 01 36.53040 -65 08 51.9180           ~ 167 0
14 BHR 71 MoC 12 01 37 -65 08.8           ~ 163 0
15 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
16 QSO B1424-41 Bla 14 27 56.29756617 -42 06 19.4376238   18.48 17.7 16.30   ~ 547 1
17 ESO 514-1 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 815 3
18 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 320 0
19 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 215 0
20 QSO J1626-2951 Bla 16 26 06.02084013 -29 51 26.9712990   18.41 20.5 17.6   ~ 452 1
21 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
22 ICRF J165039.5-294346 QSO 16 50 39.54413 -29 43 46.9548   19.01       ~ 41 1
23 2MASS J17112317-2724315 Y*O 17 11 23.17752 -27 24 31.5288           ~ 91 0
24 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 204 0
25 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 606 0
26 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 288 0

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