Table 1. Open in new tab Synopsis of the...

Phase A

Phase B

Phase C

Parameter

Units

symbol

Value

symbol

Value

symbol

Value

case (1)

case (2)

Duration

Myr

|$t_{\rm f}^{\rm A}$|

|$t_{\rm f}^{\rm B}$|

undetermined

|$t_{\rm f}^{\rm C}$|

of the phase

Cloud's velocity

km s⁻¹

|$V_{0}^{\rm A}$|

|$V_{0}^{\rm B}$|

|$V_{0}^{\rm C}$|

at the phase's start

Cloud's velocity

km s⁻¹

|$V_{\rm f}^{\rm A}$|

|$V_{\rm f}^{\rm B}$|

|$V_{\rm f}^{\rm C}$|

at the phase's end

Acceleration of the cloud

km s^{− 1} Myr^{− 1}

−α^A

3.0

−α^B

−α^C

−3.0

|$= \frac{V_{\rm f}^{\rm A}-V_{0}^{\rm A}}{t_{\rm f}^{\rm A}}$|

|$= \frac{V_{\rm f}^{\rm C}-V_{0}^{\rm C}}{t_{\rm f}^{\rm C}}$|

Cloud's density

atoms cm⁻³

|$\rho _{0}^{\rm A}$|

|$\rho _{0}^{\rm B}$|

|$\rho _{0}^{\rm C}$|

at the phase's start

Cloud's density

atoms cm⁻³

|$\rho _{\rm f}^{\rm A}$|

|$\rho _{\rm f}^{\rm B}$|

|$\rho _{\rm f}^{\rm C}$|

at the phase's end

Growth rate of the cloud's density

Myr⁻¹

λ^A

0.1

λ^B

λ^C

−0.1

|$= \frac{\rho _{\rm f}^{\rm A}-\rho _{0}^{\rm A}}{\rho _{0}^{\rm A}} \frac{1}{t_{\rm f}^{\rm A}}$|

|$= \frac{\rho _{\rm f}^{\rm C}-\rho _{0}^{\rm C}}{\rho _{0}^{\rm C}} \frac{1}{t_{\rm f}^{\rm C}}$|

Table 1.

Open in new tab

Synopsis of the main parameters of the model. The semimajor axis a and the eccentricity e of the cloud are considered constant in the three phases and equal to 300 pc and 0.866, respectively.

		Phase A		Phase B		Phase C
Parameter	Units	symbol	Value	symbol	Value	symbol	Value	Value
							case (1)	case (2)
Duration	Myr	\|$t_{\rm f}^{\rm A}$\|	10	\|$t_{\rm f}^{\rm B}$\|	undetermined	\|$t_{\rm f}^{\rm C}$\|	10	10
of the phase
Cloud's velocity	km s⁻¹	\|$V_{0}^{\rm A}$\|	0	\|$V_{0}^{\rm B}$\|	30	\|$V_{0}^{\rm C}$\|	30	30
at the phase's start
Cloud's velocity	km s⁻¹	\|$V_{\rm f}^{\rm A}$\|	30	\|$V_{\rm f}^{\rm B}$\|	30	\|$V_{\rm f}^{\rm C}$\|	0	30
at the phase's end
Acceleration of the cloud	km s^{− 1} Myr^{− 1}	−α^A	3.0	−α^B	0	−α^C	−3.0	0
			\|$= \frac{V_{\rm f}^{\rm A}-V_{0}^{\rm A}}{t_{\rm f}^{\rm A}}$\|				\|$= \frac{V_{\rm f}^{\rm C}-V_{0}^{\rm C}}{t_{\rm f}^{\rm C}}$\|
Cloud's density	atoms cm⁻³	\|$\rho _{0}^{\rm A}$\|	7	\|$\rho _{0}^{\rm B}$\|	14	\|$\rho _{0}^{\rm C}$\|	14	14
at the phase's start
Cloud's density	atoms cm⁻³	\|$\rho _{\rm f}^{\rm A}$\|	14	\|$\rho _{\rm f}^{\rm B}$\|	14	\|$\rho _{\rm f}^{\rm C}$\|	0	0
at the phase's end
Growth rate of the cloud's density	Myr⁻¹	λ^A	0.1	λ^B	0	λ^C	−0.1	−0.1
			\|$= \frac{\rho _{\rm f}^{\rm A}-\rho _{0}^{\rm A}}{\rho _{0}^{\rm A}} \frac{1}{t_{\rm f}^{\rm A}}$\|				\|$= \frac{\rho _{\rm f}^{\rm C}-\rho _{0}^{\rm C}}{\rho _{0}^{\rm C}} \frac{1}{t_{\rm f}^{\rm C}}$\|

		Phase A		Phase B		Phase C
Parameter	Units	symbol	Value	symbol	Value	symbol	Value	Value
							case (1)	case (2)
Duration	Myr	\|$t_{\rm f}^{\rm A}$\|	10	\|$t_{\rm f}^{\rm B}$\|	undetermined	\|$t_{\rm f}^{\rm C}$\|	10	10
of the phase
Cloud's velocity	km s⁻¹	\|$V_{0}^{\rm A}$\|	0	\|$V_{0}^{\rm B}$\|	30	\|$V_{0}^{\rm C}$\|	30	30
at the phase's start
Cloud's velocity	km s⁻¹	\|$V_{\rm f}^{\rm A}$\|	30	\|$V_{\rm f}^{\rm B}$\|	30	\|$V_{\rm f}^{\rm C}$\|	0	30
at the phase's end
Acceleration of the cloud	km s^{− 1} Myr^{− 1}	−α^A	3.0	−α^B	0	−α^C	−3.0	0
			\|$= \frac{V_{\rm f}^{\rm A}-V_{0}^{\rm A}}{t_{\rm f}^{\rm A}}$\|				\|$= \frac{V_{\rm f}^{\rm C}-V_{0}^{\rm C}}{t_{\rm f}^{\rm C}}$\|
Cloud's density	atoms cm⁻³	\|$\rho _{0}^{\rm A}$\|	7	\|$\rho _{0}^{\rm B}$\|	14	\|$\rho _{0}^{\rm C}$\|	14	14
at the phase's start
Cloud's density	atoms cm⁻³	\|$\rho _{\rm f}^{\rm A}$\|	14	\|$\rho _{\rm f}^{\rm B}$\|	14	\|$\rho _{\rm f}^{\rm C}$\|	0	0
at the phase's end
Growth rate of the cloud's density	Myr⁻¹	λ^A	0.1	λ^B	0	λ^C	−0.1	−0.1
			\|$= \frac{\rho _{\rm f}^{\rm A}-\rho _{0}^{\rm A}}{\rho _{0}^{\rm A}} \frac{1}{t_{\rm f}^{\rm A}}$\|				\|$= \frac{\rho _{\rm f}^{\rm C}-\rho _{0}^{\rm C}}{\rho _{0}^{\rm C}} \frac{1}{t_{\rm f}^{\rm C}}$\|

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