2015ApJ...807L..25K


Query : 2015ApJ...807L..25K

2015ApJ...807L..25K - Astrophys. J., 807, L25 (2015/July-2)

Tracing embedded stellar populations in clusters and galaxies using molecular emission: methanol as a signature of the low-mass end of the IMF.

KRISTENSEN L.E. and BERGIN E.A.

Abstract (from CDS):

Most low-mass protostars form in clusters, in particular high-mass clusters; however, how low-mass stars form in high-mass clusters and what the mass distribution is are still open questions both in our own Galaxy and elsewhere. To access the population of forming embedded low-mass protostars observationally, we propose using molecular outflows as tracers. Because the outflow emission scales with mass, the effective contrast between low-mass protostars and their high-mass cousins is greatly lowered. In particular, maps of methanol emission at 338.4 GHz (J = 70-60A+) in low-mass clusters illustrate that this transition is an excellent probe of the low-mass population. We present here a model of a forming cluster where methanol emission is assigned to every embedded low-mass protostar. The resulting model image of methanol emission is compared to recent ALMA observations toward a high-mass cluster and the similarity is striking: the toy model reproduces observations to better than a factor of two and suggests that approximately 50% of the total flux originates in low-mass outflows. Future fine-tuning of the model will eventually make it a tool for interpreting the embedded low-mass population of distant regions within our own Galaxy and ultimately higher-redshift starburst galaxies, not just for methanol emission but also water and high-J CO.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: jets and outflows - line: profiles - stars: formation - stars: winds, outflows

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 420 3
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 638 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1279 1
5 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 573 0
6 IRAS 16547-4247 Y*O 16 58 17.21 -42 52 08.9           ~ 123 0
7 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 115 1
8 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 982 2
9 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 245 2
10 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 130 0
11 NAME SERPENS SMM 3 smm 18 29 59.7 +01 14 00           ~ 87 1

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2021.09.21-07:05:39

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