.png){kind=icon}
.png){kind=icon}
Return
TIME Commissioning Observations. I. Mapping Dust and Molecular Gas in the Sgr A Molecular Cloud Complex at the Galactic Center
.png){kind=icon}
PRE
AI
Y
M
B
A
V
D
R
D
P
B
C
T
Y
D
E
F
J
C
L
K
D
E
G
T
T
W
M
DOI：10.3847/1538-4357/ae606c.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
We present the processing of an observation of Sagittarius A (Sgr A) with the Tomographic Ionized-carbon Mapping Experiment (TIME), part of the 2021-2022 commissioning run, to verify TIME's hyperspectral imaging capabilities for future line-intensity mapping. Using an observation of Jupiter to calibrate detector gains and pointing offsets, we process the Sgr A observation in a purpose-built pipeline that removes correlated noise through common-mode subtraction with correlation-weighted scaling, and uses map-domain principal component analysis to identify further systematic errors. The resulting frequency-resolved maps recover strong 12CO(2-1) and 13CO(2-1) emission, and a continuum component whose spectral index discriminates free-free emission in the circumnuclear disk versus thermal dust emission in the 20 and 50 km s-1 molecular clouds. Broadband continuum flux comparisons with the Bolocam Galactic Plane Survey show agreement to within similar to 5% in high signal-to-noise ratio molecular clouds in the Sgr A region. From the CO line detections, we estimate a molecular hydrogen mass of between 5.4 & times; 105M circle dot and 5.7 & times; 105M circle dot, consistent with prior studies. These results demonstrate TIME's ability to recover both continuum and spectral-line signals in complex Galactic fields, validating its readiness for upcoming extragalactic CO and [C ii] surveys.
Keywords:
COLOGNE DATABASE
CARBON-MONOXIDE
DATA RELEASE
ASTROPY
SPECTROSCOPY
SAGITTARIUS
PACKAGE
PROJECT
GALAXY
Journal
IF:
5.4
Papers:
8.3W
Citations:
32.0W
Organization
Cited Papers