Timeline for Estimating galactic dust extinction for medium band filters
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 14, 2016 at 18:06 | comment | added | ProfRob | @Dalek Well if you can't do it properly then you just interpolate the extinction curve to the central wavelength of your filters. The filter profile is only relevant if you are going to fold a spectrum through it. | |
| Apr 14, 2016 at 13:03 | comment | added | Dalek | @RobJeffries Well, I have optical data therefore I don't have access to the intrinsic spectrum of my objects. The process described in Schlegel et al. 1998 they have used a spectrum of an elliptical galaxy and they obtained the values for $A(V)$ but I suspect the equation is not quite right as I mentioned before. | |
| Apr 14, 2016 at 12:25 | comment | added | ProfRob | The extinction depends on the exact filter profile and on the intrinsic spectrum of the source. | |
| Apr 14, 2016 at 11:50 | comment | added | Dalek | I guess an $A(V)$ in the denominator is missing in the original equation of Schlegel et al. 1998 paper. | |
| Apr 14, 2016 at 11:40 | comment | added | Dalek | I code with python mostly. I will appreciate if I can get your code. If I only multiply $d=A_{\lambda}/A(V)$ by $\Delta m_V \equiv A(V)$ then I will get a reasonable value. | |
| Apr 14, 2016 at 8:46 | comment | added | pela | @Dalek: $A_V$ is also dimensionless, so I think you're good. Did you try doing the calculation and see if you get meaningful values? If you know Python, I have a script that can do the Cardelli law for you. | |
| Apr 13, 2016 at 22:59 | comment | added | pela | Okay, I thought using the central wavelength would be fine for you. If you want the exact extinction, you give your formula in the updated question, right? The $A(\lambda)$ in the formula is then given by Cardelli's Eq. 1, and as far as I can see, $\Delta m_V$ is $A(V)$. | |
| Apr 13, 2016 at 22:05 | comment | added | Dalek | Thanks for your answer. I have updated my question. I have been well aware of this equation, I am wondering how I can get appropriate values for my filter set? | |
| Apr 13, 2016 at 21:12 | history | answered | pela | CC BY-SA 3.0 |