2019A&A...624A..97P


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:27:01

2019A&A...624A..97P - Astronomy and Astrophysics, volume 624A, 97-97 (2019/4-1)

New bow-shock source with bipolar morphology in the vicinity of Sgr A*.

PEISSKER F., ZAJACEK M., ECKART A., SABHA N.B., SHAHZAMANIAN B. and PARSA M.

Abstract (from CDS):


Context. We find an extended source in the direct vicinity of Sgr A* with an approximate projected mean distance of 425 ± 26 mas. Its sky-projected elongated shape can be described by an averaged spatial extension of x = 110 ± 20 mas and y = 180 ± 20 mas. With this, the observed object points in the analyzed SINFONI data sets between 2006 and 2016 directly toward the supermassive black hole. We discuss different possible scenarios that could explain the detected blueshifted line emission source.
Aims. Here we present a detailed and extensive analysis of the adaptive optics corrected SINFONI data between 2006 and 2016 with a spatial pixel scale of 0.025"x0.025" and a corresponding field of view of 0.8"x0.8" per single data cube with the focus on the newly discovered source. We spectroscopically identify the source, which we name X8, in the blueshifted Brγ line maps. Additionally, an upper limit for the continuum magnitude can be derived from the close-by S-star S41.
Methods. We applied the standard reduction procedure with the SINFONI/EsoRex pipeline for the analysis. We applied pre- and post-data correction in order to establish various calibration procedures. For the sharpened images, we used the Lucy-Richardson algorithm with a low iteration number. For the high-pass filtered images, we used the smooth-subtracting process in order to increase the signal-to-noise ratio.
Results. We are able to detect the elongated line emission source in quantified data sets between 2006 and 2016. We find a lower limit for the infrared continuum magnitude of Ks≥17.0±0.1. The alignment of X8 toward Sgr A* can be detected in data sets that fulfill a sufficient number of observations with a defined quality level. A more detailed analysis of the results shows indications of a bipolar outflow source that might be associated with either a young stellar object, or with a post-AGB star or young planetary nebula.
Conclusions. The near-infrared excess source X8 close to S24, S25, and S41 can be detected between 2006 and 2016. In addition to an apparent bow-shock morphology, the source shows clear signatures of a bipolar outflow that is consistent with both a young stellar object and a post-AGB star. If confirmed, this would be the closest ever detected bipolar outflow source to the supermassive black hole. Similar to the case of the DSO/G2 source and other dusty sources, it further supports the in situ star formation in the direct vicinity of Sgr A*. If X8 were a bow-shock source, it would be the third object of this type that can be found in projection in the mini-cavity. This scenario would support the idea that the cavity is created by a wind from Sgr A*.

Abstract Copyright: © ESO 2019

Journal keyword(s): ISM: jets and outflows - black hole physics - protoplanetary disks - Galaxy: center - infrared: galaxies - stars: pre-main sequence

Nomenclature: Fig. 1: [MES2007] XN (No. X8) added.

CDS comments: [EG97] S56 and [EG97] S64 not in SIMBAD (lack of coordinates).

Simbad objects: 18

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Number of rows : 18

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 [FPA77] NGC 3603 IRS 9A IR 11 15 11.34 -61 16 45.2           ~ 18 0
2 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 964 1
3 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 100 0
4 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 35 0
5 [MES2007] X3 * 17 45 39.8478 -29 00 30.445           ~ 13 0
6 [EG97] S50 * 17 45 40.00 -29 00 28.6           ~ 15 0
7 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 113 0
8 [EG97] S13 * 17 45 40.029 -29 00 28.12           B4/9V 47 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3545 3
10 [EG97] S24 * 17 45 40.03930 -29 00 28.1468           ~ 12 0
11 NAME Sgr A*-f Cld 17 45 40.04 -29 00 28.1           ~ 42 1
12 NAME G2 Dust Cloud IR 17 45 40.04 -29 00 28.1           ~ 164 0
13 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11841 0
14 [EG97] S2 *i* 17 45 40.0442 -29 00 27.975           B0/2V 284 1
15 RAFGL 2591 Y*O 20 29 25.03656 +40 11 20.3316           ~ 571 0
16 [EG97] S41 * ~ ~           ~ 4 0
17 [EG97] S25 * ~ ~           ~ 4 0
18 [EG97] S32 * ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:27:01

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