2016A&A...595A..32B


Query : 2016A&A...595A..32B

2016A&A...595A..32B - Astronomy and Astrophysics, volume 595A, 32-32 (2016/11-1)

The HI/OH/Recombination line survey of the inner Milky Way (THOR). Survey overview and data release 1.

BEUTHER H., BIHR S., RUGEL M., JOHNSTON K., WANG Y., WALTER F., BRUNTHALER A., WALSH A.J., OTT J., STIL J., HENNING T., SCHIERHUBER T., KAINULAINEN J., HEYER M., GOLDSMITH P.F., ANDERSON L.D., LONGMORE S.N., KLESSEN R.S., GLOVER S.C.O., URQUHART J.S., PLUME R., RAGAN S.E., SCHNEIDER N., McCLURE-GRIFFITHS N.M., MENTEN K.M., SMITH R., ROY N., SHANAHAN R., NGUYEN-LUONG Q. and BIGIEL F.

Abstract (from CDS):

Context. The past decade has witnessed a large number of Galactic plane surveys at angular resolutions below 20''. However, no comparable high-resolution survey exists at long radio wavelengths around 21cm in line and continuum emission.
Aims. We remedy this situation by studying the northern Galactic plane at ∼20'' resolution in emission of atomic, molecular, and ionized gas.
Methods. Employing the Karl G. Jansky Very Large Array (VLA) in the C-array configuration and a large program, we observe the HI 21cm line, four OH lines, nineteen Hnα radio recombination lines as well as the continuum emission from 1 to 2GHz in full polarization over a large part of the first Galactic quadrant.
Results. Covering Galactic longitudes from 14.5 to 67.4° and latitudes between ±1.25°, we image all of these lines and the continuum at ∼20'' resolution. These data allow us to study the various components of the interstellar medium (ISM): from the atomic phase, traced by the HI line, to the molecular phase, observed by the OH transitions, to the ionized medium, revealed by the cm continuum and the Hnα radio recombination lines. Furthermore, the polarized continuum emission enables magnetic field studies. In this overview paper, we discuss the survey outline and present the first data release as well as early results from the different datasets. We now release the first half of the survey; the second half will follow later after the ongoing data processing has been completed. The data in fits format (continuum images and line data cubes) can be accessed through the project web-page.
Conclusions. The HI/OH/Recombination line survey of the Milky Way (THOR) opens a new window to the different parts of the ISM. It enables detailed studies of molecular cloud formation, conversion of atomic to molecular gas, and feedback from HII regions as well as the magnetic field in the Milky Way. It is highly complementary to other surveys of our Galaxy, and comparing the different datasets will allow us to address many open questions.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: formation - ISM: clouds - ISM: structure - ISM: kinematics and dynamics - ISM: magnetic fields - stars: evolution

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4076 2
2 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1545 0
3 PMN J1822-0939 Rad 18 22 28.70 -09 38 57.0           ~ 37 1
4 SNR G018.8+00.3 SNR 18 24.0 -12 23           ~ 96 0
5 SNR G029.7-00.2 SNR 18 46 25.5 -02 59 14           ~ 319 2
6 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 483 0
7 CORNISH G030.7197-00.0829 Y*O 18 47 41.79 -02 00 22.3           ~ 20 0
8 NAME Sgr Arm PoG 19 00 -30.0           ~ 586 1
9 W 51 SNR 19 23 50 +14 06.0           ~ 1210 1
10 ICRF J192559.6+210626 BLL 19 25 59.60535560 +21 06 26.1620442           ~ 187 1

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2022.06.29-20:39:05

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