2020A&A...643A.132J


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:55:41

2020A&A...643A.132J - Astronomy and Astrophysics, volume 643A, 132-132 (2020/11-1)

Dust emission, extinction, and scattering in LDN 1642.

JUVELA M., NEHA S., MANNFORS E., SAAJASTO M., YSARD N. and PELKONEN V.-M.

Abstract (from CDS):


Context. LDN 1642 is a rare example of a star-forming, high-latitude molecular cloud. The dust emission of LDN 1642 has already been studied extensively in the past, but its location also makes it a good target for studies of light scattering.
Aims. We wish to study the near-infrared (NIR) light scattering in LDN 1642, its correlation with the cloud structure, and the ability of dust models to simultaneously explain observations of sub-millimetre dust emission, NIR extinction, and NIR scattering.
Methods. We used observations made with the HAWK-I instrument to measure the NIR surface brightness and extinction in LDN 1642. These data were compared with Herschel observations of dust emission and, with the help of radiative transfer modelling, with the predictions calculated for different dust models.
Results. We find, for LDN 1642, an optical depth ratio τ(250µm)/τ(J)≃10–3, confirming earlier findings of enhanced sub-millimetre emissivity. The relationships between the column density derived from dust emission and the NIR colour excesses are linear and consistent with the shape of the standard NIR extinction curve. The extinction peaks at AJ=2.6mag, and the NIR surface brightness remains correlated with N(H2) without saturation. Radiative transfer models are able to fit the sub-millimetre data with any of the tested dust models. However, these predict an NIR extinction that is higher and an NIR surface brightness that is lower than based on NIR observations. If the dust sub-millimetre emissivity is rescaled to the observed value of τ(250µm)/τ(J), dust models with high NIR albedo can reach the observed level of NIR surface brightness. The NIR extinction of the models tends to be higher than in the direct extinction measurements, which is also reflected in the shape of the NIR surface brightness spectra.
Conclusions. The combination of emission, extinction, and scattering measurements provides strong constraints on dust models. The observations of LDN 1642 indicate clear dust evolution, including a strong increase in the sub-millimetre emissivity, which has not been fully explained by the current dust models yet.

Abstract Copyright: © ESO 2020

Journal keyword(s): ISM: clouds - infrared: ISM - submillimeter: ISM - dust, extinction - stars: formation - stars: protostars

CDS comments: Paragraph.1 [MJZ2014] B-1 and [MJZ2014] B-2 not in SIMBAD.

Simbad objects: 22

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Number of rows : 22

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 * tau01 Eri PM* 02 45 06.2034405658 -18 34 21.478629972 4.94 4.94 4.46 4.03 3.76 F7V 215 0
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1131 0
3 NGC 1499 HII 04 03 18 +36 25.3           ~ 156 0
4 Barnard 207 DNe 04 04.6 +26 20           ~ 7 0
5 LDN 1506 DNe 04 20.0 +25 17           ~ 75 0
6 LDN 1521 DNe 04 33.1 +26 06           ~ 54 0
7 [LRJ2004] LDN 1642 A1 IR 04 34 00.3 -14 10 12           ~ 4 0
8 [LRJ2004] LDN 1642 A2 IR 04 34 19.0 -14 11 43           ~ 4 0
9 HH 123 HH 04 34 49.6 -14 13 08           ~ 11 1
10 IRAS 04325-1419 Y*O 04 34 49.75392 -14 13 08.6016           ~ 30 0
11 V* EW Eri Or* 04 35 02.290464 -14 13 40.81224   15.40 14.08 13.58 11.91 K7IV 25 0
12 [LRJ2004] LDN 1642 B IR 04 35 13.1 -14 15 43           ~ 4 0
13 2MASS J04351455-1414468 LM* 04 35 14.5579229768 -14 14 46.652084016       18.7   M7 14 0
14 LDN 1642 MoC 04 35 18 -14 13.9           ~ 140 0
15 [LRJ2004] LDN 1642 C IR 04 35 41.1 -14 33 41           ~ 5 0
16 * l Eri ** 04 38 10.8240964091 -14 18 14.483465432 5.99 4.96 3.87 3.03 2.47 K2-IIIb 128 0
17 HD 29613 RG* 04 39 19.7107223550 -14 21 33.083945720   6.510 5.463     K0.5IVa 55 0
18 NGC 1909 RNe 05 02 -07.9           ~ 35 0
19 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
20 DCld 001.6+03.8 DNe 17 35 47.50 -25 32 59.0           ~ 56 0
21 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 412 0
22 NAME Per-Tau reg ~ ~           ~ 18 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-06:55:41

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