Mapping Observations of Peptide-like molecules around Sagittarius B2

Peptide-like molecule, which has a close connection with the origin of life, has been detected in universe. Mapping observations of HCONH${}_2$ and CH${}_3$CONH${}_2$, two simplest peptide-like molecules, are performed towards Sagittarius B2 (Sgr B2) complex with the IRAM 30m telescope. Seven transitions of HCONH${}_2$ and five transitions of CH${}_3$CONH${}_2$ are used in analysis. The spatial distribution of excitation temperature and column density of HCONH${}_2$ in the molecular envelope of Sgr B2 are obtained by the rotation diagrams. Assuming the same excitation temperature as HCONH${}_2$, the column densities of CH${}_3$CONH${}_2$ are also calculated. The results show that excitation temperature ranges from 6 K to 46 K in the molecular envelope of Sgr B2. The abundance ratio between HCONH${}_2$ and CH${}_3$CONH${}_2$ are calculated to explore the relationship among them, as well as HNCO mentioned in our pervious research. The abundance ratio of CH${}_3$CONH${}_2$/HCONH${}_2$ varies from 10% to 20%, while that of HCONH${}_2$/HNCO ranges from 1.5% to 10%. CH${}_3$CONH${}_2$ is enhanced with respect to HCONH${}_2$ in the northwest region of Sgr B2. One transition of H${}^{13}$CONH${}_2$ is detected toward 12 positions of Sgr B2, from which a ${}^{12}$C/${}^{13}$C ratio of 28.7 is obtained. A time-dependent chemical model with a short duration of X-ray burst is used to explain the observed abundances of HCONH${}_2$ and CH${}_3$CONH${}_2$, with the best fitting result at T${}_{\mathrm{d}\mathrm{u}\mathrm{s}\mathrm{t}}$ = 53-56 K. More chemical reactions are required to be included into the model since the modeled abundance is lower than the observed one at the observed T${}_{\mathrm{d}\mathrm{u}\mathrm{s}\mathrm{t}}$.