2014A&A...565A..18A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET00:54:55

2014A&A...565A..18A - Astronomy and Astrophysics, volume 565A, 18-18 (2014/5-1)

2MASS wide-field extinction maps. V. Corona Australis.

ALVES J., LOMBARDI M. and LADA C.J.

Abstract (from CDS):

We present a near-infrared extinction map of a large region (∼870deg2) covering the isolated Corona Australis complex of molecular clouds. We reach a 1-σ error of 0.02mag in the K-band extinction with a resolution of 3-arcmin over the entire map. We find that the Corona Australis cloud is about three times as large as revealed by previous CO and dust emission surveys. The cloud consists of a 45pc long complex of filamentary structure from the well known star forming Western-end (the head, N ≥1023cm–2) to the diffuse Eastern-end (the tail, N ≤1021cm–2). Remarkably, about two thirds of the complex both in size and mass lie beneath AV∼1mag. We find that the probability density function (PDF) of the cloud cannot be described by a single log-normal function. Similar to prior studies, we found a significant excess at high column densities, but a log-normal + power-law tail fit does not work well at low column densities. We show that at low column densities near the peak of the observed PDF, both the amplitude and shape of the PDF are dominated by noise in the extinction measurements making it impractical to derive the intrinsic cloud PDF below AK<0.15mag. Above AK∼0.15mag, essentially the molecular component of the cloud, the PDF appears to be best described by a power-law with index -3, but could also described as the tail of a broad and relatively low amplitude, log-normal PDF that peaks at very low column densities.

Abstract Copyright:

Journal keyword(s): ISM: structure - ISM: clouds - dust, extinction - ISM: general

Simbad objects: 23

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Number of rows : 23

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 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1119 0
2 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 235 0
3 NAME California Molecular Cloud MoC 04 10.0 +39 00           ~ 104 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3643 0
5 M 42 HII 05 35 17.3 -05 23 28           ~ 3776 0
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1209 0
7 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 664 2
8 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 456 1
9 NAME Lup Cloud SFR 16 03 -38.1           ~ 550 0
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3135 1
11 NGC 6248 G 16 46 22.84 +70 21 18.2   14.1       ~ 52 0
12 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 350 1
13 NGC 6584 GlC 18 18 37.60 -52 12 56.8   10.32 8.17     ~ 253 0
14 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1812 2
15 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 933 0
16 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 411 0
17 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 82 1
18 [CKR2003] MMS 13 smm 19 01 55.5 -36 57 38           ~ 21 0
19 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 776 0
20 * c Sgr LP* 20 02 39.4809660 -27 42 35.444256 8.03 6.23 4.58 2.71 1.15 M4.5III 70 0
21 V* V1943 Sgr AB* 20 06 55.2458545503 -27 13 29.754314126   9.25 8.04     M7/8III 70 0
22 V* T Mic AB* 20 27 55.1872307024 -28 15 39.798200611   8.33 6.74     M7/8III 84 0
23 NAME CMa Region reg ~ ~           ~ 39 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-00:54:55

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