halacha - Does an improperly slaughtered animal render the Shochet impure?

In Vayikra 11:39 it says:

לט. וְכִי יָמוּת מִן הַבְּהֵמָה אֲשֶׁר הִיא לָכֶם לְאָכְלָה הַנֹּגֵעַ בְּנִבְלָתָהּ יִטְמָא עַד הָעָרֶב:‏

39) If an animal that you [normally] eat, dies, one who touches its carcass shall be unclean until evening.

If a shochet improperly slaughters the animal, does the same thing apply? Is the shochet now Tamai?

This might not apply these days, but if it does make the shochet impure, what would happen if he improperly slaughtered a Korban in the Beis Hamikdash, would he have to leave the Beis Hamikdash until the evening?

Or does the dead animal only impart impurity if it dies on its own, not if it was killed?

Answer

An improperly slaughtered kosher  animal becomes a nevela. This is apparent from the term which appears several times in the Mishna (e.g. Chulin 6:2) and poskim:

השוחט ונתנבלה בידו (one who slaughters and as a result the animal becomes a nevela)

This ruling can also be deduced from this Mishna (Chulin 2:4) which comes to teach about nevelot and treifot:

כלל אמר רבי ישבב משום רבי יהושע, כל שנפסלה בשחיטתה - נבלה

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This tumah is transferred through touch or carrying. The shochet is therefore likely to become tameh, but can remain tahor.

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Dealing with a nevela in Beit HaMikdash is probably similar to dealing with a sheretz as described in the last mishna of Masechet Iruvin.