2014A&A...563A.125M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:08:45

2014A&A...563A.125M - Astronomy and Astrophysics, volume 563A, 125-125 (2014/3-1)

Multiwavelength study of the high-latitude cloud L1642: chain of star formation.

MALINEN J., JUVELA M., ZAHORECZ S., RIVERA-INGRAHAM A., MONTILLAUD J., ARIMATSU K., BERNARD J.-P., DOI Y., HAIKALA L.K., KAWABE R., MARTON G., McGEHEE P., PELKONEN V.-M., RISTORCELLI I., SHIMAJIRI Y., TAKITA S., TOTH L.V., TSUKAGOSHI T. and YSARD N.

Abstract (from CDS):

L1642 is one of the two high galactic latitude (|b|>30°) clouds confirmed to have active star formation. We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources at different stages of star formation. We present high-resolution far-infrared and submillimetre observations with the Herschel and AKARI satellites and millimetre observations with the AzTEC/ASTE telescope, which we combined with archive data from near- and mid-infrared (2MASS, WISE) to millimetre wavelength observations (Planck). The Herschel observations, combined with other data, show a sequence of objects from a cold clump to young stellar objects (YSOs) at different evolutionary stages. Source B-3 (2MASS J04351455-1414468) appears to be a YSO forming inside the L1642 cloud, instead of a foreground brown dwarf, as previously classified. Herschel data reveal striation in the diffuse dust emission around the cloud L1642. The western region shows striation towards the NE and has a steeper column density gradient on its southern side. The densest central region has a bow-shock like structure showing compression from the west and has a filamentary tail extending towards the east. The differences suggest that these may be spatially distinct structures, aligned only in projection. We derive values of the dust emission cross-section per H nucleon of σe(250 µm)=0.5-1.5x10–25cm2/H for different regions of the cloud. Modified black-body fits to the spectral energy distribution of Herschel and Planck data give emissivity spectral index β values 1.8-2.0 for the different regions. The compact sources have lower β values and show an anticorrelation between T and β. Markov chain Monte Carlo calculations demonstrate the strong anticorrelation between β and T errors and the importance of millimetre wavelength Planck data in constraining the estimates. L1642 reveals a more complex structure and sequence of star formation than previously known.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: clouds - stars: formation - submillimeter: ISM - ISM: individual objects: L1642

VizieR on-line data: <Available at CDS (J/A+A/563/A125): list.dat maps/*>

Nomenclature: Fig. 2: [MJZ2014] A-N (Nos B-1 to B-4, E, G, N).

CDS comments: Fig.6, Table 3 sources B-1 to B-4 not in SIMBAD.

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 MBM 12 MoC 02 56 50 +19 32.0           ~ 211 1
2 [LRJ2004] LDN 1642 A1 IR 04 34 00.3 -14 10 12           ~ 3 0
3 [LRJ2004] LDN 1642 A2 IR 04 34 19.0 -14 11 43           ~ 3 0
4 HH 123 HH 04 34 49.6 -14 13 08           ~ 10 1
5 IRAS 04325-1419 Y*O 04 34 49.75392 -14 13 08.6016           ~ 29 0
6 V* EW Eri Or* 04 35 02.290464 -14 13 40.81224   15.40 14.08 13.58 11.91 K7IV 24 0
7 2MASS J04350296-1410159 IR 04 35 02.9558871637 -14 10 15.646890559           ~ 1 0
8 WISE J043504.98-141002.4 IR 04 35 04.982 -14 10 02.49           ~ 1 0
9 [LRJ2004] LDN 1642 B IR 04 35 13.1 -14 15 43           ~ 3 0
10 2MASS J04351455-1414468 LM* 04 35 14.5579229768 -14 14 46.652084016       18.7   M7 12 0
11 LDN 1642 MoC 04 35 18 -14 13.9           ~ 137 0
12 [LRJ2004] LDN 1642 C IR 04 35 41.1 -14 33 41           ~ 4 0
13 IRAS 04336-1412 GiC 04 35 55.604 -14 05 54.26           ~ 5 0
14 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
15 [DB2002b] G208.42-28.39 MoC 05 01 47.6 -08 55 43           ~ 18 0
16 NGC 1909 RNe 05 02 -07.9           ~ 31 0
17 MBM 22 MoC 05 04 36.3 -08 15 55           ~ 15 0
18 LBN 213.16-27.73 HII 05 11 -12.4           ~ 2 0
19 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 480 0
20 NAME Local Bubble ISM ~ ~           ~ 693 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:08:46

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