2005A&A...432...45B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET10:16:31

2005A&A...432...45B - Astronomy and Astrophysics, volume 432, 45-67 (2005/3-2)

The Parkes HI Survey of the Magellanic System.

BRUENS C., KERP J., STAVELEY-SMITH L., MEBOLD U., PUTMAN M.E., HAYNES R.F., KALBERLA P.M.W., MULLER E. and FILIPOVIC M.D.

Abstract (from CDS):

We present the first fully and uniformly sampled, spatially complete HI survey of the entire Magellanic System with high velocity resolution (Δv=1.0km/s), performed with the Parkes Telescope. Approximately 24 percent of the southern sky was covered by this survey on a ≃5' grid with an angular resolution of HPBW=14.1'. A fully automated data-reduction scheme was developed for this survey to handle the large number of HI spectra (1.5x106). The individual Hanning smoothed and polarization averaged spectra have an rms brightness temperature noise of σ=0.12K. The final data-cubes have an rms noise of σrms≃0.05K and an effective angular resolution of ≃16'. In this paper we describe the survey parameters, the data-reduction and the general distribution of the HI gas. The Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC) are associated with huge gaseous features - the Magellanic Bridge, the Interface Region, the Magellanic Stream, and the Leading Arm - with a total HI mass of M(HI)=4.87x108M[d/55kpc]2, if all HI gas is at the same distance of 55kpc. Approximately two thirds of this HI gas is located close to the Magellanic Clouds (Magellanic Bridge and Interface Region), and 25% of the HI gas is associated with the Magellanic Stream. The Leading Arm has a four times lower HI mass than the Magellanic Stream, corresponding to 6% of the total HI mass of the gaseous features. We have analyzed the velocity field of the Magellanic Clouds and their neighborhood introducing a LMC-standard-of-rest frame. The HI in the Magellanic Bridge shows low velocities relative to the Magellanic Clouds suggesting an almost parallel motion, while the gas in the Interface Region has significantly higher relative velocities indicating that this gas is leaving the Magellanic Bridge building up a new section of the Magellanic Stream. The Leading Arm is connected to the Magellanic Bridge close to an extended arm of the LMC. The clouds in the Magellanic Stream and the Leading Arm show significant differences, both in the column density distribution and in the shapes of the line profiles. The HI gas in the Magellanic Stream is more smoothly distributed than the gas in the Leading Arm. These morphological differences can be explained if the Leading Arm is at considerably lower z-heights and embedded in a higher pressure ambient medium.

Abstract Copyright:

Journal keyword(s): Magellanic Clouds - galaxies: interactions - ISM: structure - ISM: kinematics and dynamics - surveys

Simbad objects: 20

goto Full paper

goto View the reference in ADS

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 565 2
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 689 2
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 795 1
4 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 505 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9223 1
6 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1282 2
7 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1083 4
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5494 1
9 NAME Magellanic Bridge HI 03 11 -77.5           ~ 318 1
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14537 1
11 [W73b] S8 reg 05 47 21.3 -01 40 18           ~ 8 0
12 NAME Magellanic Leading Arm III reg 10 07 -37.0           ~ 13 0
13 NAME Magellanic Leading Arm reg 11 26 -82.0           ~ 68 0
14 NAME Magellanic Leading Arm II reg 11 39 -46.0           ~ 15 0
15 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1460 0
16 NAME Magellanic Leading Arm I reg 13 19 -73.0           ~ 13 0
17 [W73b] S9 reg 17 52 05.4 -34 25 45           ~ 4 0
18 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1681 2
19 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 900 2
20 NAME Magellanic Interface Region reg ~ ~           ~ 2 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005A&A...432...45B and select 'bookmark this link' or equivalent in the popup menu


2020.02.17-10:16:31

© Université de Strasbourg/CNRS

    • Contact