Austrians are a nation which was established on the roots of Bavarians and Karantanians (old Slovenes). This is visible from their surnames and folklore (krampus for example). Some of their Austrian poets, writers and other academians want to standardize the literal Austrian language to give it the status of an independent language world wide. For example; in German there are Brötchen, but in Austrian, they know Semmeln. Or in German there is ein Junge, but in Austrian there is Bub (Poba, Pobalin in Slovene).
The "Semmel" / "Bub" criteria would make Austrians 100% Bavarian!
But seriously: I strongly suspect the Austrian Y-DNA data to have come from Vienna. As capital of a widespread, multi-ethnic empire, Vienna has obviously attracted many migrants from all Austro-Hungarian lands. As Vienna isn't far away from Slovakia, Moravia and Hungary, it furthermore should have been the obvious place to go during the industrial revolution. As such, finding traces of population from all corners of the Austro-Hungarian empire in Vienna isn't much of a surprise. Carinthia has of course strong Slavic elements, and considering that already during the bronze age a major copper trade route went from Linz to Prague, "Bohemian" genes (whatever they were and how they changed over time) in Upper Austria would also not be a surprise. Austria is at the crossing of major European roads, as long as DNA testing is done along these roads, some pan-European mix is to be expected.
Once you go to the mountain villages, the picture changes considerably. A recent study on East Tyrolia came out with the following results:
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0041885#pone.0041885.s007
[TABLE="width: 730"]
[TR]
[TD]
Haplogroup
[/TD]
[TD="align: right"]
All
[/TD]
[TD="align: right"]
"Slavic"
[/TD]
[TD="align: right"]
"Roman"
[/TD]
[/TR]
[TR]
[TD]E* (M96)
[/TD]
[TD="align: right"]1.11%
[/TD]
[TD="align: right"]0.43%
[/TD]
[TD="align: right"]5.71%
[/TD]
[/TR]
[TR]
[TD]E1b1b1a (M78)
[/TD]
[TD="align: right"]4.44%
[/TD]
[TD="align: right"]5.11%
[/TD]
[TD="align: right"]---
[/TD]
[/TR]
[TR]
[TD]G2a (P15)
[/TD]
[TD="align: right"]7.41%
[/TD]
[TD="align: right"]8.09%
[/TD]
[TD="align: right"]2.86%
[/TD]
[/TR]
[TR]
[TD]I1 (M253)
[/TD]
[TD="align: right"]15.93%
[/TD]
[TD="align: right"]16.17%
[/TD]
[TD="align: right"]14.29%
[/TD]
[/TR]
[TR]
[TD]I2a1 (P37.2)
[/TD]
[TD="align: right"]0.74%
[/TD]
[TD="align: right"]0.43%
[/TD]
[TD="align: right"]2.86%
[/TD]
[/TR]
[TR]
[TD]I2a2a (M223)
[/TD]
[TD="align: right"]2.59%
[/TD]
[TD="align: right"]2.98%
[/TD]
[TD="align: right"]---
[/TD]
[/TR]
[TR]
[TD]J (M304)
[/TD]
[TD="align: right"]8.89%
[/TD]
[TD="align: right"]9.36%
[/TD]
[TD="align: right"]5.71%
[/TD]
[/TR]
[TR]
[TD]R1a (M17)
[/TD]
[TD="align: right"]14.07%
[/TD]
[TD="align: right"]16.17%
[/TD]
[TD="align: right"]---
[/TD]
[/TR]
[TR]
[TD]R1b* (M343*, L23*, S167*, L11*)
[/TD]
[TD="align: right"]7.78%
[/TD]
[TD="align: right"]6.38%
[/TD]
[TD="align: right"]17.14%
[/TD]
[/TR]
[TR]
[TD]R1b-S116*
[/TD]
[TD="align: right"]2.96%
[/TD]
[TD="align: right"]3.40%
[/TD]
[TD="align: right"]---
[/TD]
[/TR]
[TR]
[TD]R1b-U106
[/TD]
[TD="align: right"]18.89%
[/TD]
[TD="align: right"]17.45%
[/TD]
[TD="align: right"]28.57%
[/TD]
[/TR]
[TR]
[TD]R1b-U152
[/TD]
[TD="align: right"]12.59%
[/TD]
[TD="align: right"]11.06%
[/TD]
[TD="align: right"]22.86%
[/TD]
[/TR]
[TR]
[TD]Others (G*, I*,L,Q,T)
[/TD]
[TD="align: right"]2.59%
[/TD]
[TD="align: right"]2.98%
[/TD]
[TD="align: right"]---
[/TD]
[/TR]
[/TABLE]
For once, East Tyrolia has much less R1a, E and J than the "standard" (Vienna?) data set. but comparatively more R1b, and a little more I1. Even more interestingly, there are stark differences between the north-eastern part, where various Slavic location names are found alongside German ones, and the south-western part, where Romanic location names are more common. The "Roman" side is completely lacking R1a, E-M78 and I2a2, but is instead full of ancient R1b sub-clades and Italo-Celtic R1b-U152.
I take that as a sign that the "Austrian" gene pool can change within a few km, as soon as you move away from the large cities. If genes are deemed an adequate means to conclude on ethnic identity (which I seriously doubt), it is probably better to speak of Carinthians, East Tyrolians erc. than of Austrians.