H i 21 cm Extended Structures to the Northeast and Southwest of NGC 5595: VLA Observations of the Disk Galaxy Pair NGC 5595 and NGC 5597

被引:1
|
作者
Garcia-Barreto, J. Antonio [1 ]
Momjian, Emmanuel [2 ]
机构
[1] Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Mexico City 04150, Mexico
[2] Natl Radio Astron Observ, PVD Sci Operat Ctr, POB O,Lopezville Rd, Socorro, NM 87801 USA
来源
ASTRONOMICAL JOURNAL | 2023年 / 165卷 / 06期
关键词
RADIO-CONTINUUM SURVEY; APERTURE-SYNTHESIS; NEUTRAL HYDROGEN; SPIRAL GALAXIES; SPATIAL-DISTRIBUTION; ATOMIC-HYDROGEN; GALACTIC NUCLEI; MOLECULAR GAS; CLOSE PAIRS; KINEMATICS;
D O I
10.3847/1538-3881/acc9bf
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report VLA B-configuration observations of the H i 21 cm line on the close disk galaxy pair NGC 5595 and NGC 5597. At the angular resolution of the observations, similar to 7.'' 1 x 4.'' 2, while most of the H i 21 cm in NGC 5595 and NGC 5597 has the same extent as the optical disk, we have detected for the first time extended structures (streamers) to the northeast (NE) and southwest (SW) of NGC 5595 with no counterparts in blue, red optical (continuum), 20 cm radio continuum, or H alpha spectral line emission. One structure is extended by similar to 45 '' to the NE with blueshifted velocities, and the other is extended by similar to 20 '' to the SW with redshifted velocities with respect to the systemic velocity. No H i 21 cm emission is detected from the innermost central (nuclear) regions of either galaxy. Lower angular resolution H i 21 cm imaging indicates the nonexistence of any intergalactic hydrogen atomic H i 21 cm gas as tails or bridges between the two galaxies. Our new 20 cm radio continuum emission image of NGC 5597 shows a strong unresolved elongated structure in the central region, in the NE-SW direction, very similar to the spatial location of the innermost H alpha spectral line emission. There is no 20 cm continuum emission from its northern spiral arm. In NGC 5595, the 20 cm radio continuum image shows no continuum emission from the NE or SW extended structures with H i 21 cm emission.
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页数:16
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