2013ApJ...773...30W


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:28:43

2013ApJ...773...30W - Astrophys. J., 773, 30 (2013/August-2)

The mid-infrared extinction law and its variation in the Coalsack nebula.

WANG S., GAO J., JIANG B.W., LI A. and CHEN Y.

Abstract (from CDS):

In recent years, the wavelength dependence of interstellar extinction from the ultraviolet (UV) to the near- and mid-infrared (IR) has been studied extensively. Although it is well established that the UV/optical extinction law varies significantly among the different lines of sight, it is not clear how IR extinction varies among various environments. In this work, using the color-excess method and taking red giants as the extinction tracer, we determine interstellar extinction Aλ in the four Spitzer/IRAC bands in [3.6], [4.5], [5.8], [8.0] µm (relative to AKs, extinction in the Two Micron All Sky Survey (2MASS) Ks band at 2.16 µm) of the Coalsack nebula, a nearby starless dark cloud, based on the data obtained from the 2MASS and Spitzer/GLIMPSE surveys. We select five individual regions across the nebula that span a wide variety of physical conditions ranging from diffuse and translucent to dense environments, as traced by the visual extinction, the Spitzer/MIPS 24 µm emission, and CO emission. We find that Aλ/AKs, mid-IR extinction relative to AKs, decreases from diffuse to dense environments, which may be explained in terms of ineffective dust growth in dense regions. The mean extinction (relative to AKs) is calculated for the four IRAC bands as well and exhibits a flat mid-IR extinction law consistent with previous determinations for other regions. Extinction in the IRAC 4.5 µm band is anomalously high, much higher than that of the other three IRAC bands, and cannot be explained in terms of CO and CO2ice. Mid-IR extinction in the four IRAC bands has also been derived for four representative regions in the Coalsack Globule 2, which respectively exhibit strong ice absorption, moderate or weak ice absorption, and very weak or no ice absorption. The derived mid-IR extinction curves are all flat, with AλA/AKs increasing with the decrease of the 3.1 µm H2 O ice absorption optical depth τice.

Abstract Copyright:

Journal keyword(s): dust, extinction - infrared: ISM - ISM: individual: Coalsack nebula

Simbad objects: 40

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Number of rows : 40

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 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 818 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3679 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15288 1
4 NAME Ori A MoC 05 38 -07.1           ~ 2756 0
5 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 581 1
6 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1087 1
7 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 352 0
8 NGC 2071 RNe 05 47 10 +00 18.0           ~ 615 1
9 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 898 1
10 NAME Car Arm PoG 10 00 -60.0           ~ 389 1
11 GUM 29 HII 10 24 14.6 -57 46 58           ~ 195 0
12 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 446 0
13 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1014 1
14 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 712 0
15 Tapia 3 Cld 12 29.9 -63 52           ~ 6 0
16 [SS80] 3-1 * 12 30 03.9496361635 -63 47 14.485632760       20.3 14.90 M7III 4 0
17 [JHR80] E-2 * 12 30 53.3 -63 37 32           M8III 5 0
18 [JHR80] D-4 * 12 31 04.1 -63 40 26           M4.5III 4 0
19 [JHR80] D-7 * 12 31 13 -63 45.7           M5.5III 7 0
20 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 246 0
21 [JHR80] D-11 * 12 31 24.4 -63 41 07           M5III 6 0
22 NAME Coalsack G2 MoC 12 31 29 -63 44.8           ~ 39 0
23 IRAS 12286-6318 * 12 31 30.4689356188 -63 34 50.410171136           M5 4 0
24 [JHR80] E-18 * 12 31 51.40536 -63 33 14.1300           M8 3 0
25 [SS80] 1-2 * 12 33 18 -63 43.5           M4III 4 0
26 Tapia 1 Cld 12 33.5 -63 42           ~ 6 0
27 IRAS 12340-7958 * 12 37 39.7466355997 -80 15 13.713429632   16.11 14.39 13.63 9.81 ~ 101 0
28 NAME Cha III MoC 12 37.8 -80 15           ~ 132 2
29 NAME Cha II MoC 12 54 -77.2           ~ 306 0
30 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
31 LDN 1689 DNe 16 32 22.5 -24 28 29           ~ 114 0
32 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1751 2
33 LDN 1712 DNe 16 38.0 -24 26           ~ 33 0
34 LDN 1746 DNe 17 11.3 -27 22           ~ 117 0
35 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
36 DCld 001.6+03.8 DNe 17 35 47.50 -25 32 59.0           ~ 56 0
37 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12105 0
38 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3627 3
39 M 20 OpC 18 02 42 -22 58.3           ~ 404 1
40 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 967 2

    Equat.    Gal    SGal    Ecl

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2021.04.15-06:28:43

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